Portable Vertical Antenna Systems: The Complete Field Handbook

Start here: choose the system before you choose the setting

A portable vertical is not just the stainless whip you can see. It is the radiator, loading or tuning device, return-current path, mount, feed line, nearby ground, and operating band working together. Change one of those pieces and you have changed the antenna system—even when the parts still look familiar.

This handbook is built for two kinds of readers. If you are choosing equipment, start with the quick routes below. If you already own a system, open the exact product chapter and follow its current Chameleon User Guide for assembly. The handbook explains why the system behaves as it does, how to make a repeatable field decision, and what an SWR reading or NEC pattern can and cannot prove.

What do you need to do?

Choose the question closest to the job in front of you. Each route opens one stable section of this same handbook, so CKB search and the Chameleon Help Desk can take an operator directly to the relevant answer.

What a portable vertical antenna system actually includes

A vertical radiator carries current in a predominantly vertical direction. That simple description does not tell you how the current returns, how long the radiator is electrically, where loading is placed, what impedance appears at the feed point, or whether the feed line has become part of the antenna. Those details determine how the installed system tunes and radiates.

A practical Chameleon field vertical normally includes six jobs:

1. Radiation: a telescopic whip or other conductor carries RF current.
2. Electrical length: the physical radiator and any loading component establish current distribution and the resonant region.
3. Return current: radials, counterpoise wires, or another documented structure complete the RF circuit.
4. Matching: resonant adjustment or a tuner presents an acceptable load at a defined reference plane.
5. Mechanical support: the mount keeps geometry stable without turning a connector or coil into a structural handle.
6. Feed and control: coax carries RF; in a CHA URT1 installation, one coax segment also carries DC and control.

That complete-system view prevents the most common field mistake: adjusting the visible whip while ignoring a loose radial plug, a different mount height, wet soil, a vehicle beside the antenna, or a feed line routed along the radiator. The antenna did not mysteriously change. The installation changed.

Resonant adjustment and remote tuning solve different problems

A resonant portable vertical is adjusted so the complete radiator and return system presents a useful impedance near the operating frequency. With CHA BV, the selected radiator length and guide-defined loading-coil path establish the band. With CHA PRV 2.0, the MCC 2.0 and radiator arrangement provide the field adjustment. These systems reward repeatable geometry.

The CHA URT1 takes a different approach. Its Tuner Unit is placed at or near the antenna feed point and transforms the impedance presented by the installed antenna. This can make one radiator useful over a much wider set of frequencies and can reduce loss that would otherwise occur when a highly mismatched feed line runs all the way back to a tuner in the shack.

Neither approach is automatically superior. Resonant operation avoids depending on a powered matching network and gives the operator a physically understandable band setting. Remote tuning provides frequency agility and can keep the high-SWR portion of the system short. The right choice depends on how often you change bands, whether you can adjust the antenna, what power and duty cycle you use, and how much equipment you want to carry.

A tuner does not create a return-current path, repair a poor connector, remove loading-coil loss, guarantee a desired radiation pattern, or make an unsafe installation acceptable. A resonant reading does not prove that all accepted power is radiated.

Physical height and electrical length are not the same thing

A full-size quarter-wave vertical is physically long on the lower HF bands. Portable antennas use shorter radiators because they must fit in a vehicle, pack, yard, campsite, or temporary operating area. Loading adds inductive reactance so a shorter conductor can be brought to resonance, but it does not turn that conductor into a lossless full-size radiator.

As a vertical becomes electrically shorter, its radiation resistance generally decreases and the importance of conductor, connection, coil, and ground losses increases. The system can still be highly useful—especially when portability is part of the mission—but a low SWR does not prove that the short antenna performs like a full-size one.

Electrical height is best understood as a fraction of wavelength. A 17 ft whip is close to a quarter wavelength around 20 meters, but it is a much smaller fraction on 40 or 80 meters. That is why the same radiator may operate directly on a higher band, require loading on a lower band, or depend on a wide-range tuner in a multiband installation.

A metal roof, fence, vehicle body, wet tree, mast, railing, or bundled feed line can change electrical length through coupling. When the environment changes, the old mechanical setting is a starting point—not a promise.

What the operator notices first

On a lower band, a short loaded vertical will usually have a sharper tuning point than the same radiator on a higher band. A small change in whip length or coil setting can therefore move the useful part of the response farther than expected. This is normal behavior for an electrically short, loaded system; it is not a reason to chase the adjustment with several simultaneous changes.

The useful field response is to slow down. Sweep a range wide enough to find the actual minimum, move only the guide-defined adjustment, and sweep again. If the response is unusually broad and flat, inspect for loss or a poor connection before celebrating the bandwidth.

Loading is a trade, not free electrical length

A loading coil cancels part of the short radiator's capacitive reactance at the operating frequency. It does not replace the missing current-carrying conductor. Coil resistance, connection resistance, and return-path loss consume a larger share of the available power as radiation resistance falls. That is why clean joints, a deliberate counterpoise, and the correct coil matter most on the bands where the antenna is shortest in wavelengths.

The radiator is only half of the current path

RF current must return to the source. In a monopole-style vertical, the visible whip is one side of the system and the radial or counterpoise arrangement provides the other. If the intended path is inadequate, current will search for another route through coax shield, control wiring, a tripod, a vehicle, or nearby conductors.

This is why moving the coax can change SWR, why touching a connector may change the reading, and why RF can appear in audio or computer equipment. Those symptoms do not automatically prove a defective tuner. They often indicate that the installed current path is different from the intended one.

For CHA BV and CHA PRV 2.0, begin with the exact guide-specified counterpoise system. For a single-wire CHA URT1 antenna, connect the guide-defined counterpoise or ground arrangement to the Tuner Unit ground terminal. For a coax-fed balanced antenna, the return system is part of that antenna architecture and the URT1 connection is made through the coaxial ANTENNA port.

Three different jobs are often called “ground”

Electrical safety grounding, lightning protection and bonding, and the antenna's RF return path are related parts of a station, but they are not interchangeable. A ground rod installed for safety or lightning control does not automatically provide a low-loss RF return path for a short portable vertical. Conversely, four portable counterpoise wires are not a lightning-protection system.

When a customer says “the antenna is grounded,” the useful next question is: grounded for which job? The answer determines whether to inspect the electrical service bond, the lightning path, or the radial and counterpoise arrangement.

How the coax gets recruited

If the intended return path is weak or asymmetric, the outside of the coax shield can carry common-mode current. That can alter the apparent tuning, distort the installed pattern, couple RF into station wiring, and make the result sensitive to where the cable lies. A choke can help control an unwanted path, but it should not be used to hide a missing or poorly connected guide-defined counterpoise.

Counterpoise and radial layout: make the invisible half repeatable

The current CHA BV and CHA PRV 2.0 field configurations use four 12.5 ft counterpoise wires in their principal vertical paths. Spread them around the base as evenly as the site safely allows, keep connections clean and secure, and prevent people or vehicles from crossing them. If the footprint forces a different layout, record it and expect the resonant point to move.

Ground-laid wires interact with soil. Moisture, conductivity, surface material, and the amount of wire near the feed point affect loss and input impedance. A desert site, damp park, concrete patio, and metal-roof installation are not electrically interchangeable. That is why a portable setting can be repeatable without being universal.

Elevated radials are a different design choice. Their lengths, height, symmetry, and isolation matter, and they should not be substituted for a ground-laid portable configuration without a deliberate design and safety plan. Likewise, a permanent broadcast-style field is not the same object as the compact four-wire field system in a product guide.

More radial wire can reduce loss in some installations, but “more” is not a tuning instruction. Start with the controlled configuration. If you test a change, keep the radiator, loading, feed line, measurement point, and site constant.

Portable counterpoise versus permanent radial field

A field system is designed around speed, packability, public safety, and repeatable setup. A permanent ground-mounted vertical can justify more wire, careful burial or surface placement, weather-resistant connections, and a measured site study. The goals are different, so the same recommendation should not be copied between them.

ARRL vertical-antenna guidance shows that the useful radial system depends on antenna electrical length, soil, radial number, radial length, and whether the wires are elevated or ground-laid. Short loaded verticals are especially sensitive to loss around the base. That principle explains why the return system deserves attention; it does not override Chameleon's product-specific setup.

For a portable operator, the best first improvement is often consistency: the same number of wires, similar spacing, fully seated connectors, and a known feed-line route. For a fixed station, improvements should be evaluated with lightning protection, bonding, drainage, corrosion control, and local structural requirements.

Base loading versus center loading

A loading coil carries the current available where it is placed. Moving it upward changes how much radiator current flows below the coil and changes current distribution over the entire conductor. As a general engineering principle, placing necessary loading above the base can improve radiation efficiency, but it also creates a taller assembly and different mechanical stresses.

That tradeoff is visible in the CHA PRV 2.0 family. The primary SS58 configuration places the MCC 2.0 between lower and upper radiator sections. The guide also documents base-loaded and optional MPAS Ready arrangements. Each has its own component order, total height, adjustment range, and use. Do not copy a coil position or tuning mark from one geometry to another.

Base loading can be easier to reach and produce a shorter installation. Center loading can put more active conductor below the coil. The right answer is the configuration that fits the site and is supported by the current guide—not a universal slogan about coil position.

Mount, height, and surroundings are electrical variables

A ground spike, tripod, vehicle mount, balcony clamp, and roof installation place the antenna in different electrical environments. Even when radiator dimensions do not change, coupling to ground and nearby metal changes. A mount is therefore both a mechanical choice and part of the installed RF context.

Use a mount that safely carries the system's weight and wind load. Tighten threaded antenna parts hand-snug unless the guide calls for a tool. Do not drive a ground spike by striking an assembled loading coil or using the radiator as a handle. Keep coax strain off tuner and antenna connectors.

Retune or recheck resonance after changing height, mount type, radial layout, or surroundings. Controlled NEC mount-height studies explain pattern changes for exact modeled cases; they do not approve an arbitrary balcony, vehicle, rooftop, or mast installation.

Know where the measurement is made

An analyzer at the antenna feed point sees the impedance there. An analyzer at the station end of a coax line sees that impedance after the line has transformed it and after line loss has reduced the apparent mismatch. Those readings can both be real while being different.

For resonant field adjustment, keep the analyzer location and test cable consistent. If you compare settings with different cable lengths or with one measurement at the feed point and another in the shack, you have changed the reference plane.

With the CHA URT1, the high-mismatch path is normally on the antenna side of the outdoor Tuner Unit. Once the tuner matches that load, the long coax back to the Coupler and radio is on the matched side. This is the central practical reason for feed-point tuning.

Why a station-end tuner cannot repair the line ahead of it

A tuner at the radio transforms the impedance presented to the transmitter. It does not change the standing-wave ratio already present on the feed line between that tuner and the antenna. If that line is long, small, or lossy, a severe mismatch can turn useful RF into heat before it reaches the radiator. The transmitter may see an excellent match while the antenna system remains inefficient.

A remote tuner changes where the boundary falls. With a short antenna-side connection and the Tuner Unit at the feed point, most of the long coax operates close to its intended impedance after a successful match. This does not make the tuner lossless or the radiator efficient; it removes one avoidable high-SWR coax run from the problem.

A fair A/B comparison

To compare two settings, use the same analyzer, calibration, cable, reference plane, radial layout, and surroundings. Record frequency as well as SWR. Moving the analyzer from the feed point to the radio end is not merely moving the instrument—it changes what network is included in the measurement.

A repeatable resonant-vertical tuning workflow

1. Confirm identity. Use the exact product, radiator, loading component, band, and current guide.
2. Build the complete geometry. Install the documented mount, component order, whip length, and radial system.
3. Inspect before power. Check threaded joints, banana plugs, coax connectors, insulation, coil condition, and stability.
4. Choose one reference plane. Use the same test cable or station-end arrangement for every comparison.
5. Sweep broadly. Find the response below, through, and above the intended band.
6. Change one control. Adjust whip length, the guide-defined tuning tube, or the allowed radial length—not several things.
7. Read the direction. If resonance is too low, the system is electrically too long; if too high, it is electrically too short.
8. Verify the operating segment. A minimum at one point does not guarantee acceptable SWR across a wide band.
9. Begin transmitting at low power. Stop for unstable readings, arcing, heating, or RF feedback.
10. Record the final setting. Save band, component order, dimensions, radial layout, site, and reference plane.

When the next site behaves differently, restore the recorded baseline before improvising. Most field troubleshooting becomes faster when you distinguish a product problem from a changed installation.

A low SWR is useful. It is not a performance certificate.

SWR describes the relationship between forward and reflected waves at the measurement plane. It helps protect equipment and confirms that a matching objective has been reached. It does not tell you how much power became radiation, how much was lost in soil or a loading coil, what the elevation pattern looks like, or whether common-mode current is flowing on the feed line.

A lossy system can look broad and easy to match because loss absorbs energy. A narrow, low-loss resonant system may require more precise adjustment. Neither bandwidth alone nor the lowest displayed SWR identifies the better antenna.

Use SWR as one instrument reading. Combine it with a known configuration, stable connections, temperature checks, pattern evidence, controlled receive comparisons, and on-air observations. One distant contact proves a path existed at that moment; it does not measure efficiency or guarantee future range.

Two antennas can show the same SWR and behave very differently

One may be a low-loss resonant radiator with a deliberate return system. The other may reach the same number through a tuner while losing power in a coil, transformer, feed line, wet connector, or soil. The meter at the radio cannot separate those losses. It reports the impedance condition at its own reference plane.

The practical question is not “How close can I get to 1:1?” It is “Is the complete system correctly assembled, within its limits, stable under power, and suitable for this path?” A clean 1.4:1 in a controlled configuration may be a better operating result than a suspiciously broad 1.0:1 obtained by adding loss.

How to read Chameleon's 2D and 3D NEC patterns

Each published pattern belongs to one exact modeled configuration: radiator geometry, loading position, band, height, ground assumptions, and model revision. Select the model that matches the system you are actually studying. A curve from a neighboring product is not a substitute.

Elevation view

The elevation plot is a vertical slice. Energy near the horizon is associated with lower-angle paths; energy at higher angles can support shorter ionospheric paths when propagation allows. A modeled lobe angle is not a mileage promise because ionospheric conditions, terrain, clutter, polarization, and losses are outside the normalized shape.

Azimuth view

The azimuth plot is a horizontal slice at the stated elevation angle. A symmetrical vertical over symmetrical surroundings is often broadly omnidirectional, but loading, asymmetric radials, feed-line current, and nearby objects can distort the real installation.

Three-dimensional view

The 3D model exposes lobes and nulls that are difficult to understand from one slice. Rotate it to understand shape, not to search for an absolute “strongest color.” Confirm normalization and coordinate labels before comparing models.

What the library does not prove

The normalized library does not by itself establish installed SWR, impedance, efficiency, realized gain, tuner loss, loading-coil heating, common-mode current, reliable range, or field correlation. Rejected or guide-contradicting cases are withheld rather than relabeled as another product.

MPAS Ready: a modular system with controlled electrical paths

MPAS Ready is Chameleon's name for the modular, building-block compatibility shared by many radiators, loading components, mounts, transformers, and accessories. The benefit is practical: an operator can reuse proven parts, replace a field component, or build a different documented antenna without starting over with unrelated hardware.

The important word is documented. A 3/8-24 connection can confirm that two pieces screw together, but it cannot establish current distribution, feed-point impedance, power handling, wind load, matching range, or a safe mechanical stack. The MPAS Ready Product Guide is the map of available components and known system relationships. The exact User Guide for the chosen antenna remains the assembly and operating authority.

Use the system in this order

1. Name the complete configuration. “CHA MPAS 2.0 Portable Vertical” is useful; “a whip and a coil” is not specific enough.
2. Open its current guide. Confirm the radiator, transformer or tuner, return path, mount, band, and component order.
3. Confirm the limiting part. Power, duty cycle, connector, feed line, tuner, transformer, and mechanical limits all remain in force.
4. Open the matching NEC case. Use the model only when its geometry and evidence state match the installed system.

This discipline preserves the real advantage of modularity. You can change missions quickly without turning the parts bin into an uncontrolled experiment.

CHA MPAS 2.0 or CHA MPAS Lite?

Choose CHA MPAS 2.0 when breadth is the priority. Its current manual documents six configurations: Manpack Vertical, Portable Vertical, Horizontal NVIS, Sloping Wire, End-Fed Inverted-L, and End-Fed Inverted-V. That makes it the more complete field toolbox for an operator who expects the site, support, propagation objective, or available footprint to change.

Choose CHA MPAS Lite when carried weight and setup simplicity have higher priority. Its current guide documents four paths: Telescoping Vertical, End-Fed Inverted-V, Sloping Wire, and Horizontal NVIS. It keeps genuine configuration choice while removing part of the larger kit's inventory.

Do not decide from the product name alone. Decide whether you need a fast self-supported vertical, a low or high wire path, a broadside NVIS arrangement, or several of them from one bag. Then compare the exact included parts, support requirements, return-path footprint, and adjustment workflow.

CHA MPAS 2.0: one field kit, six documented antenna choices

The strength of CHA MPAS 2.0 is not that one antenna shape does everything. It is that one controlled component set can be reorganized into several genuinely different antennas. The operator chooses the configuration that fits the path, site, available support, and setup time instead of forcing a vertical into every job.

Manpack Vertical

This is the compact vertical path for restricted space and rapid movement. The manual controls the exact Hybrid, radiator, mount, and counterpoise arrangement. Its smaller physical size is useful, but lower-band operation asks more of loading, matching, and the return system. Keep the coax route and counterpoise repeatable before judging the result.

Portable Vertical

The taller vertical path uses the guide-defined telescopic and extension components to place more conductor in the current path. It remains a monopole system: the visible radiator and the documented counterpoise are both part of the antenna. A successful tuner match does not make the counterpoise optional.

Horizontal NVIS

The low horizontal wire arrangement is the deliberate choice when the operating objective favors stronger high-angle radiation for shorter regional ionospheric paths. Height, wire shape, soil, and frequency determine the result. “NVIS” describes the intended deployment and propagation use; it does not guarantee that the ionosphere will support a path at that moment.

Sloping Wire

A sloper is often easier to erect from one support and can move the feed point to an accessible location. Its pattern is not equivalent to the symmetrical horizontal arrangement: slope direction, feed-point height, wire end height, and surroundings create asymmetry. Preserve the exact diagram when using a corresponding NEC pattern.

End-Fed Inverted-L and Inverted-V

These wire paths use vertical and horizontal conductor sections differently. The inverted-L is useful when one support permits a vertical rise and a horizontal run. The inverted-V uses a high center region with both legs descending. Neither should be described merely as “the long wire”; each has its own geometry, support demands, coupling, and pattern.

The current MPAS 2.0 manual is the final authority for parts, knots, connections, safety, and configuration drawings. This chapter explains the decisions behind those drawings and keeps the CKB from collapsing six antennas into one generic product answer.

CHA MPAS Lite: one modular kit, four complete field antennas

CHA MPAS Lite is a portable broadband antenna system, not one fixed radiator. Its current guide documents four complete deployments: a telescoping vertical, an end-fed inverted V, a sloping wire, and a horizontal NVIS wire. Choose the geometry for the required path, then preserve that geometry's matching unit, return path, feed line, support, and safety boundaries.

The standard kit contains a HYBRID-MICRO or HYBRID-MINI matching transformer/antenna base, one 60-foot antenna/counterpoise wire on a winder, an SS17 telescoping whip, SPIKE MOUNT, and coax with an integrated RFI choke. The same 60-foot wire is a counterpoise in the vertical and the radiator in the three wire configurations. Paracord, a throw line or weight, a plastic or rubber mallet, and a separate tent stake may also be needed.

Controlled specifications

The installed matching transformer sets the power ceiling. Do not apply HYBRID-MINI limits to a HYBRID-MICRO kit. The radio, tuner, coax, connector, choke, radiator, accessory, and duty cycle may impose a lower limit.

Choose the documented path

The distance table in the guide treats ground wave as 0-90 miles, short as 0-300 miles, medium as 300-1,500 miles, and long as more than 1,500 miles. Those are selection categories, not guarantees. Terrain, soil, foliage, noise, ionosphere, frequency, time, power, and installation losses control real results.

Site selection and RF safety

Keep every radiator, counterpoise, support line, mast, throw weight, and possible fall path far from electrical conductors. Never install where the whip, wire, or a support can contact utility lines. Account for people, animals, vehicles, trails, doors, and trip hazards. Mark low wires and stakes.

Treat the whip base, wire ends, matching-transformer terminals, counterpoise connection, and nearby conductors as possible high-RF-voltage areas. De-energize before changing radiator length, wire geometry, tuner state, coax, or counterpoise. Use only hand force on 3/8-24 joints. Drive the bare SPIKE MOUNT first with a plastic or rubber mallet; never hammer an assembled antenna.

Inspect before assembly

Confirm the exact HYBRID model and its connector, the SS17 or optional SS25 identity, clean straight threads, free telescoping sections, an undamaged 60-foot wire and terminal lug, secure isolation rings, intact shackle and carabiner, sound coax and integrated choke, and a stable mount. Stop for cross-threading, cracked insulation, exposed conductor or shield, crushed coax, loose hardware, corrosion, a deformed spike, or a whip section that will not lock.

Telescoping vertical

1. Select a clear site and drive SPIKE MOUNT about eight inches into suitable ground.
2. Remove transport nuts if fitted, thread the HYBRID base stud into the mount, and hand-tighten.
3. Thread SS17 into the top antenna socket. Extend one section at a time from the top.
4. Connect the terminal lug of the 60-foot wire to the mount's counterpoise connection. Deploy approximately 25-35 feet in a convenient direction; do not leave a tight coil beside the feed point.
5. Connect the supplied coax to the HYBRID and radio, keeping the integrated choke in the documented feed line.
6. Sweep or test at low power. Use a tuner where the complete system requires it.

For the guide's higher-band no-tuner starting points, use a 25-foot counterpoise:

These are initial values from the controlled guide, not promised results. Site and return-path changes can move resonance. The optional SS25 improves lower-frequency vertical performance but does not remove the need to verify SWR, tuner range, power, mount strength, and wind load.

End-fed inverted V

Choose roughly 45 feet of clear length with a central support about 20 feet high. Unwind the 60-foot wire and move its floating isolation ring near center. Raise that ring with a nonconductive support line, keeping the apex around 20 feet so the intended angle is retained. Place SPIKE MOUNT about 22 feet from the center support and attach the HYBRID.

Electrically connect the wire's terminal lug to the top antenna socket with the shackle; use the carabiner between the adjacent isolation ring and shackle ring for strain relief. Support and stake the far end with about five feet of paracord. Keep the wire tight enough to control, but not taut. If used, connect one 25-foot counterpoise to the mount and lay it on the ground. Connect the choked coax, inspect every mechanical load point, and test at low power.

Above 10 MHz, expect a mainly bidirectional pattern broadside to the wire; below 10 MHz the guide treats the pattern as broadly omnidirectional and capable of NVIS. Surroundings and actual height can change both.

Sloping wire

Choose one support that can hold the far end 25-40 feet high. Attach at least 50 feet of nonconductive support line to the far isolation ring, raise the end, and secure it. Fully deploy the wire with modest sag. Install SPIKE MOUNT near the low end and attach the HYBRID.

Attach the terminal lug to the top antenna socket with the shackle and transfer mechanical strain through the carabiner and isolation ring. Add a 25-foot counterpoise when available. Connect the choked coax and test. The guide describes this as predominantly omnidirectional at lower frequencies, becoming somewhat directional toward the raised wire end as frequency increases. Do not treat that trend as a fixed bearing or gain claim.

Horizontal NVIS

Use two supports roughly 60 feet apart. Raise both the HYBRID end and the far wire end to about 10-12 feet, keeping the radiator horizontal with some sag. Lower heights can be appropriate over desert, beach, or snow-covered ground, but require site-specific verification.

At the feed end, connect the terminal lug and shackle electrically and use the carabiner for strain relief. Connect coax before raising the assembly. If used, connect a 25-foot counterpoise to the HYBRID base stud; route it down and then along the ground beneath the wire. Raise the far isolation ring with a separate nonconductive line. Inspect both supports, clearances, feed-line strain, and escape paths before applying power.

This geometry is intended for NVIS on lower HF frequencies and can also support medium-range sky wave above 10 MHz. NVIS depends on the operating frequency being below the current critical frequency; no fixed distance or availability is guaranteed.

Compatible accessories and boundaries

The controlled guide names COUNTERPOISE KIT, JAWMOUNT, UCM, and SS25. COUNTERPOISE KIT supplies four 25-foot radials and stakes and is especially useful under the vertical. JAWMOUNT supports suitable rails, racks, pipes, and similar structures. UCM supports suitable clampable flat surfaces. Their individual guides control clamping, leverage, wind, grounding, and load limits; thread fit alone is not structural approval.

Other MPAS Ready components may form documented systems, but that does not make every possible stack an approved MPAS Lite configuration. When replacing the supplied mount, radiator, feed line, or HYBRID, identify the exact completed path and apply the lowest power and mechanical limit. Do not invent compatibility from photographs or common 3/8-24 threads.

Troubleshooting

No useful match. Verify which of the four configurations is actually installed, exact HYBRID model, correct radiator connection, counterpoise continuity, coax and choke, tuner state, and connector seating. Sweep broadly at low power.

Reading changes when the coax or operator moves. Suspect common-mode current, an open counterpoise, damaged choke, poor connector, or an unintended conductor near the antenna. Restore the documented feed and return path before adding parts.

Vertical is weak below 7 MHz. This is a published boundary of the telescoping-whip path. Use a documented wire configuration or the optional SS25 path appropriate to the objective; a tuner cannot restore radiation efficiency lost to an electrically short radiator and system losses.

Wire pulls on the electrical terminal. Lower the antenna and restore the carabiner/isolation-ring strain relief. The terminal lug carries RF; it is not the primary structural support.

Intermittent SWR or arcing. Stop transmitting. Inspect the telescoping joints, terminal lug, shackle, coax, choke, HYBRID terminals, moisture, and nearby conductors. Do not resume until the fault is removed.

Recovery and evidence boundary

Disconnect the radio first, then lower wire configurations under control. Remove coax from the HYBRID and roll it without twisting. Collapse a whip from the bottom one section at a time. Disconnect and wind the antenna/counterpoise wire, recover every line and stake, remove the HYBRID, and pull the spike. Clean off soil and moisture, inspect for wear, and store the complete kit together.

The July 21, 2024 CHA MPAS Lite User Guide controls the supplied parts, four configurations, assembly, recovery, troubleshooting, power, and specifications. The current HYBRID, mount, whip, counterpoise, and MPAS Ready component records control their own limits. The accepted MPAS Lite NEC library may illustrate normalized pattern shape for its exact modeled cases; it does not prove installed SWR, efficiency, gain, range, tuner loss, feed-line current, or the safety of a different field setup.

Radiators, loading coils, and extensions: identify the job of each part

CHA SS17, CHA SS25, and CHA SS58 are telescopic radiators of different lengths and construction. A longer physical radiator can place more conductor in the active current path, but length alone does not approve a band or component stack. Use the radiator named in the exact guide.

CHA MIL WHIP 2.0 is a sectional whip built for fast field deployment and compact transport. Its mechanical format changes how it is carried and assembled; its electrical behavior still depends on installed length, loading or matching device, return path, and surroundings.

CHA M-COIL and CHA M25-COIL are fixed loading components for specific documented radiator-and-band configurations. They are not universal lower-band adapters. The M-COIL inventory includes approved 30 m and 40 m modeled families; M25-COIL coverage belongs to its SS25/40 m configurations. The current product guide controls actual assembly and power.

CHA MCC 2.0 is continuously adjustable within its documented configurations. Its tuning tube changes effective inductance, but the setting has meaning only with the named radiator below and above it, the same return system, band, and installation.

CHA MIL EXT 2.0 and CHA CAP HAT alter the radiator geometry. An extension changes conductor length and loading position; a capacity hat changes end capacitance and current distribution. Both can materially move resonance and change the modeled pattern. Their presence in the MPAS Ready ecosystem does not authorize an arbitrary combination.

When troubleshooting, name every part in order from mount to tip. “MPAS vertical” is too vague to select a tuning value or NEC curve. “Puck Hub, MCC 2.0, lower SS58, upper SS58, four 12.5 ft counterpoise wires, 20 m” is a configuration that can be checked.

HYBRIDs, counterpoises, and mounts do different jobs

CHA HYBRID family components provide guide-defined feed and impedance-transition functions in particular wire and vertical systems. They do not automatically make the connected wire resonant, replace a tuner in every installation, or prove that two mechanically connected parts form an approved antenna. HYBRID, HYBRID-MINI, and HYBRID-MICRO are not interchangeable names; follow the exact guide.

The counterpoise or radial system provides an intended RF return path for an unbalanced vertical. The mount supports geometry. A ground spike can supply mechanical support and environmental coupling, but it is not a substitute for every guide-defined counterpoise. A tripod can stabilize the antenna without becoming an engineered radial field.

That separation is useful in the field. If the antenna moves in the wind, inspect the mount. If tuning changes when the coax is moved, inspect the return path and common-mode current. If several bands fall outside a tuner's range, confirm the radiator, transformer or tuner architecture, and wire length. One symptom should not cause random changes to all three jobs.

Vertical-family NEC coverage: choose evidence, not just a picture

The controlled guide-asset package contains paired 2D and static 3D exports for a broad set of MPAS 2.0, MPAS Lite, BV, PRV 2.0, URT1, V-DIPOLE, radiator, loading, and CAP HAT models. The package is a distribution index—not automatic proof that every row is customer-ready. The storefront registry's evidence state, current product guide, and exact model identity still control publication.

For example, MPAS 2.0 and MPAS Lite have extensive multi-configuration, multiband assets. CHA URT1 has a modeled HOA vertical family, but the tuner network is excluded from the normalized far-field model. URT1 MB has no independent pattern because it is a bracket. V-DIPOLE has specific 30 m and 40 m models; that does not authorize copying those curves to its higher-band physical configurations.

Before comparing plots, confirm five fields: product, complete configuration label, band, modeled height or environment, and evidence state. If any one differs from the installed antenna, treat the plot as background education rather than product-specific evidence.

CHA URT1: move the matching point to the antenna

The CHA URT1 is a wide-range automatic tuner built as two units. The indoor Coupler Unit sits near the radio and gives the operator power, tuning control, and status indications. The weather-resistant Tuner Unit contains the matching network and is normally installed outdoors at or near the antenna feed point. Coax between them carries RF as well as DC and control through the Coupler's bias-T system.

This architecture solves a real feed-line problem. When a non-resonant antenna is connected to a tuner in the shack, the coax between tuner and antenna may operate at high SWR. The tuner can make the radio happy, but it cannot recover energy already dissipated in that mismatched line. Placing the matching network at the antenna end means the long coax run is on the matched side.

The URT1 does not require a radio-brand-specific control cable. It covers 1.8–54 MHz, stores up to 16,000 tuning solutions, and is intended to work with a wide range of single-wire and coax-fed antennas when the complete installation falls within its matching and operating limits.

That flexibility is not permission to connect everything at once. The single-wire Beehive terminal and coaxial ANTENNA connector are alternative outputs. The powered Coupler-to-Tuner coax must remain uninterrupted. The radiator, return path, feed arrangement, power level, and duty cycle still control whether an installation is sensible.

Who benefits most from this architecture?

The strongest use case is an operator who changes bands or frequencies often and can place the Tuner Unit at the antenna. An HOA operator can leave a discreet radiator in place instead of mechanically retuning it for every band. A field or emergency station can standardize one antenna-side geometry, store proven solutions, and move frequencies without walking back to the radiator after every change.

A resonant antenna remains the simpler answer when one band, low complexity, and operation without tuner power matter more than agility. The URT1 earns its place when feed-point matching solves an actual operating problem—not merely because a tuner can produce a low number on the display.

The URT1 signal path, in plain language

Follow the system from the radio outward:

1. The transceiver connects by a short 50-ohm coax jumper to the Coupler Unit's TRANSMITTER connector.
2. The Coupler Unit's TUNER connector connects by coax to the outdoor Tuner Unit's COUPLER connector.
3. The Tuner Unit connects to the antenna through either the top Beehive terminal for a single-wire path or the bottom ANTENNA connector for a coax-fed path.
4. The required counterpoise, balanced transition, or antenna-side return system completes the chosen configuration.
5. A 12–14 V DC supply powers the Coupler; confirm the current requirement in the newest guide and product listing.

The middle coax segment is special. It is not simply an RF patch cable. The Coupler injects DC and control onto it. Any device inserted there can block the control path, short the supply, or encounter a condition for which it was not designed.

Meters, amplifiers, filters, switches, diplexers, and station-side protective devices belong between the transceiver and Coupler only when their own instructions and the complete station design permit them. Do not place them between Coupler and Tuner.

Think of the Coupler-to-Tuner cable as a controlled bus

Although it looks like ordinary coax, this segment is carrying more than RF. Treat both connectors and the cable as part of the URT1 control system. An accessory that is transparent to RF may still interrupt DC, introduce a short, or expose internal circuitry to control voltage. “It passes RF” is therefore not a sufficient compatibility test.

Before troubleshooting the antenna, trace this path physically from one labeled connector to the other. Remove every unapproved intermediate device, inspect both ends, and confirm the power supply. That simple walk-down catches many installation faults faster than changing radiator length.

Choose one URT1 antenna output

Use the Beehive terminal for a single-wire path

The insulated Beehive terminal on top of the Tuner Unit is for a single conductor such as a guide-defined end-fed random wire or direct-fed vertical. The ground terminal receives the required counterpoise or ground connection. Leave the coaxial ANTENNA connector unused.

Use the ANTENNA connector for a coax-fed path

The SO-239 ANTENNA connector on the bottom is for an antenna system already presented through coax, such as a dipole with its proper feed-point BALUN, a loop path, or another guide-defined coax-fed system. Leave the Beehive terminal unused.

Never use both outputs together

The two connectors are not a combiner, diversity system, or two-antenna switch. Connecting both changes the load and creates uncontrolled current paths. Choose the one connection shown for the application.

Weather and strain

Seal outdoor coax connections with a proper weatherproofing system, create drip loops where appropriate, and provide strain relief. The connector should carry electrical current, not the pull of the antenna or feed line.

What can the CHA URT1 tune?

The URT1 User Guide and Applications Guide document several installation families. They are not identical, but they share one principle: put the Tuner Unit close to the load it must match and preserve the correct return-current and feed arrangement.

Single-wire and end-fed random-wire systems

Connect the radiator to the Beehive terminal and the required counterpoise or ground arrangement to the ground terminal. “Random” does not mean “any convenient length.” A length near a half wavelength on an intended band can present an extremely high impedance. Begin with the current guide's length guidance and expect site geometry to affect the load.

Ground-mounted verticals

A whip or other direct-fed vertical can use the Beehive path when installed as a documented single-wire radiator with a deliberate return system. The URT1 HOA Special and MPAS Ready examples use this architecture. The tuner supplies matching; the counterpoise or radial system supplies the other side of the RF circuit.

Coax-fed dipoles and inverted-V antennas

Connect the antenna coax to the bottom ANTENNA port and leave the Beehive unused. Keep the Tuner Unit near the antenna feed point or feed-point BALUN when practical. The dipole geometry and feed-point device still determine balance, loss, and pattern.

Balanced-feedline antennas

Ladder line and a center-fed balanced antenna require a suitable current BALUN between the URT1's unbalanced ANTENNA output and the balanced line. Connect a short coax jumper from ANTENNA to the BALUN. Do not connect ladder line between the Beehive and ground terminals, and never put the BALUN in the powered Coupler-to-Tuner coax.

CHA TDL, CHA SKYLOOP, MPAS, and EMCOMM paths

The applications guide shows the URT1 replacing the normal matching device in specific Chameleon systems. That substitution must follow the illustrated architecture; it is not a claim that every MPAS Ready mechanical combination is electrically approved.

Mobile installations

A short mobile whip can be tuned over a useful range when the Tuner Unit is close to the mount and the vehicle provides the intended return structure. Mobile installations demand careful bonding, weather protection, cable routing, and RF-exposure evaluation. A successful match does not prove low loss on the lower bands.

URT1 with ladder line: BALUN first, ratio second

The URT1 ANTENNA output is unbalanced. A center-fed doublet, dipole, or balanced loop fed with two-conductor line is intended to be balanced. A current BALUN provides the transition. This is a current-balance job first; the printed impedance on the line does not tell you the correct transformer ratio by itself.

“450-ohm line” describes the line's characteristic impedance under a particular termination. The load seen at the tuner changes with antenna length, operating frequency, balanced-line length, height, geometry, and surroundings. On different bands, the same line can transform the antenna impedance to a low, moderate, very high, or strongly reactive value.

A 1:1 current BALUN provides the transition without an intentional ratio change. A 4:1 current BALUN may be useful when the complete antenna and line present a suitably high impedance. Choose from the measured or modeled complete system—not by dividing the line label by 50.

Route balanced line away from metal and ground, preserve conductor spacing, avoid tight coils of unused line, cross unavoidable metal near a right angle, and provide strain relief. Stop for arcing, hot terminals, transformer heating, damaged insulation, or unstable supports.

Why line length can decide whether one band is friendly

Balanced line transforms impedance as a function of electrical length. A line length that presents a comfortable load on one band can present a very low, very high, or strongly reactive load on another. The tuner sees the transformed impedance at the end of the line—not the antenna's feed-point impedance and not simply the line's printed characteristic impedance.

If one intended band will not tune while others do, first restore the guide-defined arrangement and inspect the BALUN and line routing. When the application guide permits a line-length adjustment, change it deliberately by several feet and retest every required band. A change that helps one frequency can make another worse.

URT1 counterpoise and return-path decisions

A single-wire installation needs a deliberate return path at the Tuner Unit. The July 29, 2026 guide provides minimum counterpoise starting lengths by lowest operating band: 52 ft for 160 m, 27 ft for 80 m, 18 ft for 60 m, 13 ft for 40 m, 9 ft for 30 m, 7 ft for 20 m, 5 ft for 17 m, 4 ft for 15 or 12 m, 3 ft for 10 m, and 2 ft for 6 m.

These are product-guide starting points, not proof that one wire produces an ideal ground system at every site. A single 27 ft counterpoise is described as satisfactory for most 80 m installations, but soil, routing, coupling, and radiator geometry still influence the result.

If tuning changes when coax moves, do not immediately add random wire. Restore the documented connection, inspect the ground terminal, separate coax from the radiator, and check whether the intended counterpoise is carrying return current.

Choosing the starting length

Use the lowest band you genuinely intend to operate, not the lowest band printed on the radio. A longer counterpoise can occupy more space, cross public paths, and couple to nearby objects. A shorter one may make the lowest intended band harder to match or encourage more current onto the coax. The guide's table is a starting point for that trade, followed by a real-site check.

When several wires are easier than one

Multiple wires can sometimes fit a site more safely than one long conductor and can make the return path less dependent on a single direction. That is a separate installed geometry, however. Do not call it equivalent to the documented single-wire example without measurement. Keep every conductor clear of people and vehicles, and never connect or reposition it while transmitting.

How to tune the CHA URT1 without guessing

1. Confirm the complete antenna, return path, Coupler, Tuner, and coax connections.
2. Turn the Coupler on and confirm the green TUNER indicator.
3. Set the radio to the exact operating frequency.
4. Bypass the radio's internal tuner.
5. Select a mode that produces a steady carrier, following the transceiver instructions.
6. Set transmit power between 0.5 and 15 W. Ten watts is the normal field starting point.
7. Key the transmitter and briefly press the TUNING button.
8. Unkey when the cycle completes. A one-second green COMPLETE indication means success; a quick green flash means failure.
9. Verify SWR before increasing power and remain within the complete system's lowest rating.

A normal new cycle can take about five seconds. When the frequency matches a stored solution, recall can be much faster. Tuning requires both RF and the button action; pressing the button without transmitting, or transmitting without initiating the cycle, is not the complete procedure.

Retune after power-up and whenever a frequency change produces unacceptable SWR. A saved memory belongs to the load that existed when it was created. If wire route, counterpoise, weather, or surroundings change, verify the result.

If the tune fails, do not repeat it at higher power

A failed search means the Tuner Unit did not find an acceptable combination for the load it saw. More power does not extend the matching range and can increase stress. Confirm the selected output, return path, radiator length, frequency, and unobstructed powered coax segment. Then make one antenna-side change and retry at low power.

Build memories from a known installation

For a planned deployment, tune the actual antenna geometry at the intended site or in a representative setup, then record the frequency and physical arrangement. Memories make a stable system faster. They cannot make a changing or poorly defined load repeatable.

CHA URT1 power and duty-cycle limits

These are ceilings, not targets. Match at 0.5–15 W before raising power. A reactive load can create high voltage or current inside the tuner, along balanced line, at a connector, or in a BALUN even when output is below the headline limit. Long transmissions and digital modes create more average heating than intermittent voice peaks.

Stop if the Tuner Unit, transformer, connector, or feed line becomes unexpectedly warm; if SWR changes during a transmission; or if arcing, odor, smoke, or unstable behavior appears. Let the system cool and correct the load or operating cycle before transmitting again.

Why mode matters

A voice signal reaches peaks but spends much of its time below peak power. A digital carrier or other high-duty signal can hold substantial power continuously. Components that remain cool during brief SSB peaks can heat during a long digital transmission at a much lower indicated peak. The 30 W digital/high-duty ceiling exists for that different thermal job.

The system limit is a chain

The URT1 rating does not raise the rating of a BALUN, jumper, feed line, connector, radiator, or loading component. Nor does a high-rated radiator protect a tuner from a difficult reactive load. Identify the lowest applicable limit before transmitting and reduce power further when the match is unstable, the load is near an operating boundary, ventilation is poor, or ambient temperature is high.

What the URT1's 16,000 memories do for an operator

The URT1 stores tuning solutions so returning to a previously used frequency can be faster than a full search. In a rehearsed field installation, band changes feel less like rebuilding the antenna and more like selecting a channel.

Memory recall is not a substitute for verification. The stored relay state assumes the antenna-side load is sufficiently similar. If whip length, wire route, counterpoise, BALUN, balanced-line length, weather, or surroundings changed, the old solution may no longer be best.

For an emergency or expedition kit, rehearse the installation and save known working frequencies using the geometry you intend to deploy. Label radiator and counterpoise, standardize the cable path, and keep a short setup note with the equipment.

A practical frequency plan

Store the frequencies the station is actually expected to use: primary voice channels, digital channels, nets, and alternates. Verify each at the intended power class and duty cycle. A memory bank filled with random test frequencies is less useful than a small, rehearsed communications plan.

When the station changes location, treat the first recall on each band as a check rather than an assumption. If the indicated match has shifted, run a fresh low-power tune and update the operating note.

Remote versus local URT1 installation

The preferred role is remote: place the Tuner Unit outside near the feed point, keep the Coupler indoors, and let the coax between them carry matched RF plus control power. This reduces the length of line exposed to high SWR.

The guide also permits a local-tuner arrangement when replacing an existing station tuner or using installed coax. The Tuner Unit is then near the Coupler indoors and only coax-fed antennas are used. Feed line beyond the tuner can still operate at high SWR, so line type and length matter more.

Choose the local arrangement because the installation requires it—not because it is electrically identical to remote tuning. Preserve the no-device Coupler-to-Tuner rule in either arrangement.

Installation details that prevent field failures

Mount the outdoor Tuner Unit so water drains away, connectors remain accessible, and antenna tension is carried by a proper support. Use the included mounting hardware or the guide-defined CHA URT1 MB path. The Coupler Unit is not weatherproof and belongs indoors or in a protected enclosure.

Use a known-good 50-ohm coax line between Coupler and Tuner. Confirm both ends go to the correct labeled connectors before applying power. Route cable away from sharp edges, hot surfaces, foot traffic, and points where a vehicle door or tripod leg can crush it.

Plan lightning protection and bonding for the actual installation. Because the Coupler-to-Tuner segment carries DC and control, do not insert an arbitrary arrestor there. Disconnect and ground the antenna system safely when not in use and whenever lightning is possible.

Troubleshooting the CHA URT1

The TUNER indicator does not light

Turn off power. Verify the DC source, polarity, connector, cable condition, switch position, and current capacity against the current guide. Confirm the Coupler-to-Tuner coax is connected to the correct ports and is not open or shorted. Do not repeatedly power a system that shows the red ERROR indication.

The tuner reports a failed match

Confirm a steady carrier within the 0.5–15 W tuning range and bypass the radio's internal tuner. Verify the intended antenna output is used, the other is empty, and the return path is connected. If the load is outside range, change the antenna or feed arrangement—not the power.

The match changes when the coax moves

Inspect connectors and cable first. Then evaluate common-mode current and return path. Restore separation between radiator and coax, confirm the counterpoise, and keep the cable route consistent.

One balanced-line band will not tune

Confirm a current BALUN is at the antenna side of the Tuner Unit, not in the powered control segment. Restore symmetrical routing and keep line away from metal and ground. If permitted, change balanced-line length by several feet and retest every intended band.

RF appears in audio, controls, or computers

Reduce power. Inspect antenna balance or return path, cable routing, bonding, and current BALUN where applicable. Confirm station accessories are on the radio side of the Coupler. A ground rod alone does not automatically cure common-mode current.

A connector, BALUN, or tuner heats

Stop transmitting and remove power. Heating can indicate loss, excessive current, excessive voltage, poor contact, a difficult reactive load, or too much average power. Do not continue merely because the SWR display is low.

CHA BV: a complete resonant field system, not just a telescoping whip

CHA BV is a single-band-at-a-time resonant portable vertical system. In its standard SS17 form it covers the documented 40-6-meter amateur bands by changing whip length, radial arrangement, and loading state. It is not a broadband HYBRID antenna and does not normally require an antenna tuner when assembled and adjusted according to its guide.

The current kit is a complete current path: SPIKE MOUNT, CHA BLANK feed adapter, PUCK HUB, four 12 ft 6 in B-RADIAL wires on winders, SS17, M-COIL for 40 and 30 meters, four TENT STAKES, and 12 ft of coax with an integrated RFI choke. Radiator length alone does not define the antenna; the feed assembly, isolation, coax, loading coil, radials, mount, ground environment, and nearby objects all participate.

Controlled specifications

Complete documented configurations and relationships

The guide's specifications contain one unresolved sentence saying 60 meters requires a second optional M-COIL. The same guide provides no two-M-COIL 60-meter vertical assembly, length table, tuning procedure, or drawing. Its complete documented 60-meter procedure is the SS17 plus CHA LZ SLOPER Inverted Lazy L. The two-M-COIL 60 m vertical is not an authorized substitute. Therefore this handbook does not present it as an approved configuration. That claim remains withheld pending controlled correction.

Site selection and safety

Keep the complete antenna and every support, rope, radial, wire, and feed line away from overhead power lines. Choose a clear area that contains the extended radiator and its fall radius. The standard vertical procedure calls for an approximately 26-foot-diameter area; the Lazy L needs roughly 62 feet of clear length and space for four radials.

Keep people, animals, combustible material, sensitive medical devices, wiring, and uncontrolled conductors out of the RF exposure and high-voltage regions. The loading coil, whip base, wire end, feed point, and radial connections can carry high RF voltage. Never change whip length, coil state, a bypass jumper, radial count, or wire geometry while transmitting.

Assess soil, slope, wind, and traffic before installing SPIKE MOUNT. Drive only the bare spike with a rubber or plastic mallet. When using UCM, JAWMOUNT, or CARBON FIBER TRIPOD, follow its structural procedure and preserve the CHA BLANK/PUCK/radial electrical order. A different support can change base height and resonance.

Inspect the entire system

Inspect CHA BLANK threads and RF connector, PUCK HUB holes, banana plugs, radial conductors, isolation rings, line winders, stakes, coax and integrated choke, M-COIL or M25-COIL, bypass sockets and jumper, SS17 or SS25 sections, crown/tip, mount, and optional guying or Lazy L hardware.

Stop for cross-threading, bent telescoping sections, a section that will not hold, cracked insulation, exposed shield, loose connector, burned or displaced coil winding, loose banana socket, damaged jumper, corroded contact, missing isolation, or a mount that cannot resist the complete load. Replace or repair the fault before RF testing.

Identify M-COIL and M25-COIL correctly. They are similar in size, but the guide describes M25-COIL as having fewer turns and a red covering. Do not select by color alone when a unit is altered or uncertain; verify its controlled identity and intended radiator.

Standard SS17 vertical assembly

1. Drive the bare SPIKE MOUNT at the center of the chosen area.
2. Install PUCK HUB beneath CHA BLANK with the hub indentation upward, then thread CHA BLANK onto the mount. Tighten threaded joints by hand.
3. For 40 or 30 meters, install M-COIL above CHA BLANK with its winding active. For 20-6 meters, omit it or use the documented bypass on updated units.
4. Extend SS17 one section at a time from the top. On the ground, measure from its bottom and collapse from the top until the required starting length is obtained.
5. Thread SS17 onto CHA BLANK or M-COIL carefully; its motion makes cross-threading easier. Do not use the whip as a lever.
6. Connect the specified number of radials to PUCK HUB, leave the required length deployed, and retain excess wire on the winder. Stake the isolation-ring ends.
7. Connect the supplied 12-foot coax to CHA BLANK and the transceiver. Preserve the integrated feed-point choke and do not extend beyond the documented feed-line path without a governed current-control assessment.
8. Sweep and fine-tune the complete antenna before normal transmission.

SS17 initial settings

Updated M-COIL units have side banana sockets for an operator-made short bypass jumper. On 40 and 30 meters, remove that jumper so the winding is active. On higher bands, bypass or remove the coil as the controlled configuration requires. A loose or partly seated jumper can arc, heat, and create unstable resonance.

Optional SS25 vertical

The SS25 path uses the same feed, mount, radial, inspection, and tuning discipline but a different radiator and table. On 40 meters use M25-COIL with the winding active. For 30-6 meters, omit or bypass M25-COIL. Its jumper is not included.

SS25 creates greater height and leverage. Use only a mount and guying arrangement approved for that completed stack and present conditions. The guide specifically says SS25 is not recommended for the Lazy L configuration.

Inverted Lazy L for 60, 75, and 80 meters

Use SS17 with the optional 60-foot CHA LZ SLOPER wire. Place SPIKE MOUNT roughly ten feet from one end of the clear area, assemble PUCK HUB and CHA BLANK, extend the top two whip sections, place the wire strain-relief loop over the crown ball, and clip the radiator wire to the top section. Install CHA UGS or another documented support plan before raising the complete side-loaded whip.

Fully extend SS17 and the wire while leaving generous sag. Stake the far isolation ring; raising the low end about three feet may improve SWR. Connect four radials in opposite directions and stake their ends. The wire is cut for the low end of 80 meters. Shorten it for 75 or 60 meters only by retaining turns on its line winder and securing them; do not cut the controlled wire during normal field tuning.

Avoid overstressing the whip and wire. Structural guy lines counterbalance side load; they do not become radials. Lower and de-energize the system before changing wire length, sag, end height, guying, or radial geometry.

Tuning the resonant system

Use an analyzer with a broad sweep from below to above the band at the intended feed-line reference plane. If resonance is below the desired frequency, the radiator is too long; shorten the telescoping whip or retain more Lazy L wire on its winder. If resonance is above the band, the radiator is too short; extend an available whip section or deploy more controlled wire.

When resonance is inside the band but the SWR dip is shallow above 2.0:1, reduce radials one at a time or wind a small, equal amount from the radial set. The general objective is to retain the greatest radial length and count the system will tolerate while meeting the match requirement. Every radial change can also shift resonance, so re-sweep and adjust one variable at a time.

Low SWR proves only the measured input match. It does not prove efficiency, safe RF exposure, correct coil identity, an approved system, or a stable mechanical installation. Stop for arcing, heating, odor, intermittent readings, moving hardware, increasing wind, or an SWR change when the coax or operator moves.

URT1 and MPAS conversions

Adding HYBRID-MICRO or HYBRID-MINI changes BV components into a documented MPAS Lite broadband path. Use the matching unit's frequency, power, tuner, radiator, counterpoise, coax, and current-control rules; do not reuse the resonant BV length table merely because the same whip and mount are present.

The URT1 Applications Guide documents a different conversion using CHA URT1 and URT1 MB to create a remotely tuned 80-6-meter vertical without adjusting whip length or using a resonant loading coil. Follow the exact URT1 direct- or coax-feed diagram. The guide's BV illustration retains radials at PUCK HUB beneath CHA BLANK. Do not operate the resonant M-COIL/M25-COIL procedure and the URT1 conversion as though both were simultaneously controlling the antenna.

Troubleshooting

No resonance appears in the expected band. Verify the exact SS17 or SS25 table, coil identity and bypass state, measured whip length, radial count and deployed length, PUCK orientation, CHA BLANK connector, and complete assembly order. Sweep broadly before changing parts.

The SWR dip is high but in the correct band. Inspect radial connections and isolation, then reduce radial count one at a time or retain equal excess length on the winders. Recheck resonance after every change.

The minimum moves when coax or the operator moves. Inspect the integrated choke, connector integrity, mount isolation, radial continuity, and unintended common-mode current. Preserve the documented 12-foot feed-line path unless a controlled extension/current-control plan exists.

A loaded band behaves like a higher band. The coil may be bypassed, open, misidentified, or poorly connected. De-energize and inspect the winding, both threaded joints, banana sockets, and jumper state.

The Lazy L pulls the whip sideways. Lower the system. Restore sag, reposition or add documented guying, reduce unsafe wind exposure, and verify the wire strain relief. Do not use SS25 for this path.

SWR remains above 5:1 after restoring the official configuration. Substitute a known-good coax, inspect every adapter and RF connector, document the configuration and symptoms, and contact Chameleon Support.

Recovery, care, and evidence boundary

Disconnect the transceiver first. Collapse the whip one section at a time from the bottom, remove coax, separate components without using long parts as levers, and recover radials, stakes, wire, and guying. Roll coax without twisting it. Remove dirt and moisture; inspect all components again. Apply only a light suitable anti-seize coating to clean 3/8-24 threads and keep it away from RF connector contacts and insulating surfaces.

Store the two coils and any bypass jumpers so their identities and required states remain obvious. Keep the complete kit together in a protective bag. After a fall, arc, overload, hard impact, severe wind event, or water intrusion, inspect and electrically verify the full system before reuse.

The April 23, 2025 CHA BV User Guide controls the standard kit, assembly, exact SS17 and SS25 tables, Lazy L procedure, tuning, recovery, troubleshooting, and published specifications. The May 24, 2025 M25-COIL Quick Start controls the operator-made bypass relationship and jumper-not-included boundary. The current URT1 User and Applications Guides control only the named remote-tuner conversion. Governed companion-product records control their own mechanical and power limits. NEC material may illustrate normalized pattern shape for exact accepted configurations; it does not prove SWR, efficiency, gain, range, or compatibility for a different installation.

CHA BV pattern and configuration evidence

The governed NEC inventory separates SS17 and SS25 radiators, direct-fed bands, fixed-coil bands, wire configurations, and controlled mount-height studies. Every selector label preserves the exact radiator, band, loading position, and modeled height.

Use a BV pattern to understand normalized shape for that case. Do not infer a different product's impedance or performance. If a model is rejected, non-convergent, or inconsistent with the current guide, it is withheld rather than replaced.

CHA PRV 2.0: tune the complete resonant vertical, not the coil alone

CHA PRV 2.0 is a modular, resonant portable vertical system for one-band-at-a-time operation. The standard kit covers 40-6 meters through three principal SS58 arrangements; the MCC 2.0 guide also documents four additional MPAS Ready configurations. Resonance depends on the radiator, MCC 2.0 position, return system, mount, base height, feed line, soil, and nearby objects. A low SWR at the coil is not enough to prove that the full system is correct or efficient.

The standard kit includes MCC 2.0, SS58, one 27-inch SINGLE EXT, CHA BLANK feed adapter, PUCK HUB, four 12.5-foot counterpoise wires on winders, tent stakes, Band Keys, and 12 feet of RG-58 coax with an integrated RF choke. The exact CHA BLANK connector may be SO-239 or BNC. Preserve the integrated choke.

Controlled specifications

The guide contains height conflicts: center-loaded prose says 94 inches while its table and specifications say 97 inches; two-SINGLE-EXT prose says 118 inches while the table says 124 inches. This handbook uses 97 and 124 inches provisionally because those are the tabulated values, while preserving the discrepancy for document correction. Do not use either number as a structural clearance without measuring the actual assembled system.

Seven documented MCC 2.0 configurations

These rows are documented examples, not permission to assemble arbitrary 3/8-24 combinations. The exact radiator, feed adapter, radial system, mount, and lowest component power/load rating remain controlling.

Site, mount, and safety

Select a clear operating area large enough for the vertical's fall radius and as many as four radials. Keep the complete antenna, mount, radials, coax, and operator away from overhead utilities. Treat the whip, MCC winding, feed adapter, radial connections, and wire ends as possible high-RF-voltage areas. De-energize before changing coil height, whip length, radials, or configuration.

The guide supports MPAS Ready 3/8-24 mounts and names SPIKE MOUNT, UCM, CARBON FIBER TRIPOD, JAWMOUNT, and the Camera Tripod Adapter. The mount's own instructions control substrate, clamp engagement, wind, overturning, guying, and load. Do not drive SPIKE MOUNT while the antenna is assembled, do not strike MCC 2.0, and do not use the coil or whip as a handle.

Inspect the complete kit

Check MCC 2.0 winding and Tuning Tube, Lock Knob, SS58 sections and base stud, SINGLE EXT, CHA BLANK connector and threads, PUCK HUB holes, banana plugs, radial conductors and isolation rings, line winders, stakes, Band Keys, coax, integrated choke, mount, and every optional radiator. Stop for burned or displaced winding, a loose tube, cross-threading, bent whip, damaged cable, exposed shield, loose banana socket, corrosion, a missing insulator, or an unstable mount.

Standard center-loaded SS58 assembly

1. Install the chosen mount according to its guide.
2. Thread PUCK HUB onto the bottom of CHA BLANK with its indented face upward; hand-tighten.
3. Thread SINGLE EXT into the top of CHA BLANK, MCC 2.0 onto SINGLE EXT, and SS58 onto MCC 2.0.
4. Thread CHA BLANK onto the mount. Never rotate a long assembled stack as a lever against a joint.
5. Plug the required radial set into PUCK HUB and deploy the correct length. Stake through each isolation ring without placing strain on the conductor.
6. Fully extend SS58. Connect the supplied choked coax to CHA BLANK and the transceiver.
7. Set the MCC 2.0 initial position, sweep at low power, and fine-tune the complete installation.

The base-loaded version omits SINGLE EXT between CHA BLANK and MCC 2.0. One or two optional 12-inch EXTENDER rods may raise the base and permit elevated radials, but changing base height changes resonance and mechanical loading.

Standard 40-10-meter starting settings

Measure MCC height from the bottom of the Tuning Tube to the bottom of the coil. Band Keys are approximate field gauges for SS58 base- and center-loaded configurations only; they are not final calibration and do not transfer to MIL WHIP, SS17, or an unidentified legacy MCC.

Fine tuning

Use an analyzer or SWR indication with minimal test power. Loosen the Lock Knob, move the Tuning Tube gently one winding “bump” at a time, and remeasure. Moving the tube up increases inductance and lowers resonant frequency; moving it down reduces inductance and raises resonant frequency. Tighten the Lock Knob finger-tight after adjustment; overtightening can damage it.

If the antenna is resonant in the desired band but the minimum remains above 2:1, reduce the number of counterpoises one at a time or retain a small amount of a Faraday Strip Radial. Radial changes also move resonance, so repeat the sweep. Record the successful coil height, base height, mount, radial state, site, and radiator for faster redeployment.

Six-meter vertical OCFD

Remove MCC 2.0, PUCK HUB, and counterpoise wires. Install SINGLE EXT directly on the 3/8-24 mount, CHA BLANK above SINGLE EXT, and SS58 above CHA BLANK. Start with SS58 at 51 inches. Lead the coax horizontally away, perpendicular to the lower radiator, for about one foot. Shorten SS58 to raise resonance or lengthen it to lower resonance. This is an off-center-fed dipole arrangement; adding the standard radials or coil changes the system.

Optional radiators

For MIL WHIP, use the base- or center-loaded order shown in the table. The guide describes approximately 60-17-meter operation. The folded whip increases height, wind area, leverage, and handling risk; apply the MIL WHIP and mount limits as well as MCC 2.0 limits.

For SS17, install MCC 2.0 at the base for loaded 75-30-meter operation. With MCC 2.0 fully down, the guide treats SS17 as a full-size quarter-wave path for 20-6 meters, tuned by adjusting whip length. Do not reuse the SS58 Band Key settings. Verify the exact radial system and tune from a broad sweep.

Accessories and system relationships

The guide names CHA SS INSULATOR, SPIKE MOUNT, UCM, CARBON FIBER TRIPOD, Camera Tripod Adapter, JAWMOUNT, STINGER KIT Permanent, Faraday Strip Radial, and the printed Field Guide. CHA SS INSULATOR separates the radial system from a conductive mount and may make tuning more repeatable. STINGER KIT Permanent provides six four-foot rigid radials and is documented for 7-54 MHz, with a tuner possibly needed on 40 meters. Faraday Strip Radials may strengthen the return path but still require complete-system retuning.

Use only the compatibility and construction currently documented for each accessory. A common thread or connector proves fit, not RF performance, wind safety, or an approved parent system.

Troubleshooting

No resonance is visible. Verify the exact seven-path assembly, radiator identity, MCC position, CHA BLANK connection, PUCK orientation, radial count and length, coax, choke, and mount isolation. Sweep well beyond the target band before changing parts.

Resonance is below the band. The system is electrically too long: move the MCC Tuning Tube down in small increments, or shorten the adjustable radiator in a direct/OCFD path.

Resonance is above the band. The system is electrically too short: move the Tuning Tube up, or lengthen the adjustable radiator where that path permits it.

Dip is in-band but remains shallow. Reduce radial count one at a time, inspect the RF choke and mount coupling, then retune. Do not chase SWR by random simultaneous changes.

SWR remains above 5:1 after correct tuning. De-energize, inspect every joint, substitute known-good coax, and check adapters. Document the configuration and contact Chameleon Support if the fault remains.

Intermittent response or heating. Stop transmitting. Inspect the winding, Lock Knob, tube contact, connectors, coax, and radial plugs. Apply no further power until the fault is understood.

Recovery and evidence boundary

Disconnect the radio and antenna coax, roll the cable without twisting, unplug and wind each radial, recover stakes, collapse SS58, and separate the stack without using long components as levers. Remove the mount, check the site for parts, clean soil and moisture, inspect for damage, and store components in the Tactical Storage Bag.

The May 4, 2026 CHA PRV 2.0 User Guide controls the kit, seven configurations, exact starting table, assembly, tuning, accessories, recovery, troubleshooting, and specifications. Companion-product records control optional mounts and radiators. The unresolved height discrepancies remain disclosed rather than silently normalized. No modeled pattern, connector fit, or low-SWR observation expands the documented compatibility, power, or structural boundaries.

PRV 2.0 optional configurations: read the whole diagram

The guide documents a continuum from compact base-loaded arrangements to taller center-loaded systems using optional MPAS Ready components. Component order, total height, counterpoise, and band determine the configuration.

Do not select an arrangement from its silhouette alone. Confirm the exact radiator model, extension, insulator, mount, and radial system. A threaded connection establishes mechanical fit; it does not prove the electrical configuration.

The current guide contains known wording and package-list ambiguities awaiting an official document correction. Those documents remain online. Until the revision arrives, the illustrated build and current Shopify package record control; the CKB must not turn a conflicting sentence into a universal setting.

CHA MCC 2.0: the adjustable loading component

The MCC 2.0 is not a complete antenna. It is the adjustable inductive element used in guide-defined vertical configurations. Its role depends on the radiator below it, radiator above it, band, counterpoise, mount, and tuning-tube position.

Because it does not operate independently, there is no meaningful standalone MCC 2.0 radiation pattern. The CKB routes an operator to the full configuration in which it was modeled. A component can be central to an antenna without owning the antenna's pattern.

Protect the coil mechanically. Do not use it to drive a spike, lift an assembled antenna, or absorb cable strain. Keep the winding and moving tube clean and inspect for damage before transmitting.

CHA V-DIPOLE: build and tune the complete resonant two-arm system

CHA V-DIPOLE is an MPAS READY add-on that converts the documented CHA TDL component family into a resonant portable V dipole for 40 through 6 meters. It is intended for temporary operation where a low-mounted, compact, tuner-free antenna is useful: small lots, HOA-constrained locations, campgrounds, field sites, and portable stations.

This is a symmetrical two-arm antenna. Both sides must use matching CHA SS17 whips, the same extension, and the same loading state. On 40 and 30 meters both CHA M-COIL units and the Hairpin Match are in circuit. On 20 through 6 meters both coils are removed or bypassed with equivalent operator-made jumpers and the Hairpin Match is removed. A one-sided or mixed state is not an approved configuration.

Controlled specifications

Do not import a power rating from CHA TDL, HYBRID-MINI, M-COIL marketing, another MPAS configuration, or connector fit. If the exact completed-system power boundary cannot be established, operate conservatively and obtain current controlled guidance.

Kit contents and required parent components

The add-on kit supplies two Medium Loading Coils (CHA M-COIL), one stainless-steel insulator, one Hairpin Match, one CHA BLANK adapter, one PL-259-to-PL-259 adapter, one SO-239 T adapter, one PL-259-to-BNC adapter, one banana-jack-to-BNC connector, and one Single Extension. Current M-COIL units have small banana sockets on opposite sides for an operator-made bypass jumper; the jumper is not supplied.

The installation also uses the documented TDL/MPAS READY parent components: TDL HUB, two SS17 telescoping whips, suitable support, coax, and the required mounting adapters. The guide illustrates a Surveyor's Tripod, CHA SURVEYOR-A, and SINGLE EXT support stack. It also identifies MPAS-ready support alternatives such as CHA SPIKE MOUNT or CHA UCM when their own instructions and mechanical limits are satisfied. A support interface does not change the antenna's electrical component order.

Exact component order

Assemble on the ground with no feed line connected to the radio:

1. Install the approved support adapter on the support. In the illustrated path, mount CHA SURVEYOR-A on the surveyor tripod.
2. Thread the SINGLE EXT into the support adapter.
3. Thread the stainless-steel insulator into the SINGLE EXT.
4. Thread the TDL HUB onto the insulator.
5. On the first side, install one M-COIL and then one SS17.
6. On the opposite side, install CHA BLANK, the second M-COIL, and the second SS17.
7. Install the PL-259-to-PL-259 adapter in CHA BLANK, followed by the SO-239 T adapter, PL-259-to-BNC adapter, and banana-jack-to-BNC connector in the guide-defined order.
8. For 40 or 30 meters only, insert both Hairpin Match banana plugs into the banana-jack connector.
9. Connect the coax to the remaining SO-239 port on the T adapter and provide strain relief so the adapter stack does not carry cable weight.

Hand-tighten threaded interfaces. Do not use the electrical adapters as handles. Confirm the stainless-steel insulator remains between the support and energized antenna structure.

Band starting table

The following values are starting points. Installed resonance changes with site, support, height, nearby conductors, soil, coax routing, and production tolerances. Extend both SS17 whips equally.

For a bypassed higher-band setup, make two short, insulated jumpers with suitable banana plugs and equivalent construction. Connect one across the two side sockets of each M-COIL. Confirm continuity and secure seating before raising the antenna. Never bypass only one coil. On 40/30 meters remove both jumpers so both coils are electrically active.

Safety and inspection

Keep the full whip sweep, support, coax, falling radius, and operator adjustment area away from power lines. Treat whip tips, loading coils, Hairpin Match, and open conductor regions as possible high-RF-voltage areas. Keep people, animals, combustibles, vehicles, and uncontrolled conductive objects outside the required RF and mechanical safety area.

Inspect the support, adapters, SINGLE EXT, insulator, HUB, CHA BLANK, coil bodies, coil threads, banana sockets, jumpers, Hairpin Match, RF adapters, coax, and both SS17 whips. Reject cracked insulators, bent whip sections, damaged threads, loose banana plugs, overheated parts, exposed jumper conductor, or a support that cannot resist the antenna's bending moment and wind load.

Tune the complete antenna

Connect an antenna analyzer between the transceiver/feed line and antenna, or use an SWR meter at low power. Sweep broadly from below the selected band to above it; do not judge the system from one spot frequency.

• If resonance is below the desired portion of the band, both whips are too long. Shorten the same section on both sides by the same amount and remeasure.
• If resonance is above the desired portion, both whips are too short. Extend the same available section on both sides equally and remeasure.
• If resonance is in the intended portion and SWR is 1.5:1 or less, stop adjusting.

Make one small symmetric change at a time. Do not use a tuner to conceal a wrong Hairpin state, one active and one bypassed coil, unequal whip lengths, or a loose adapter.

Change bands without losing the baseline

Lower and de-energize the antenna before changing components. For 40/30 meters, ensure both M-COILs are active and install the Hairpin Match. For 20-6 meters, remove both M-COILs or bypass both with equivalent jumpers, and remove the Hairpin Match. Reset both SS17 whips to the table value, then fine-tune symmetrically. Record final lengths, support, height, and site so the configuration can be reproduced.

Troubleshooting sequence

If SWR will not reach 2.0:1 or less:

1. Lower the antenna and hand-tighten every adapter and threaded component.
2. Confirm both arms use SS17, have equal extension, and have identical M-COIL/bypass state.
3. Confirm the Hairpin Match is installed only for 40/30 meters and is connected to the correct banana-jack assembly.
4. Disconnect the entire Hairpin assembly from CHA BLANK.
5. Connect the coax directly to CHA BLANK.
6. Fully extend both SS17 whips and measure at 14.1 MHz.
7. Recheck the complete assembly diagram and insulator order.
8. Substitute a known-good coax if SWR remains above 2.0:1.
9. Contact technical support with band, component state, whip lengths, support, height, analyzer sweep, and photographs if the problem remains.

If one arm behaves differently, compare the two whips side by side for equal section extension, bent or dirty joints, damaged threads, coil orientation, jumper continuity, and nearby conductive asymmetry. Do not trim only one arm unless later controlled documentation authorizes an asymmetric configuration.

Recovery and maintenance

Disconnect the radio and lower the antenna before disassembly. Remove coax strain before loosening adapters. Collapse both whips carefully without forcing sections. Remove and store Hairpin Match and jumpers so banana plugs cannot bend. Inspect threads and connector centers, wipe away dirt and moisture, dry all components, and pack matched pairs together. Record any intermittent jumper, damaged whip, or loosened adapter before the next deployment.

Compatibility and evidence boundary

CHA V-DIPOLE is a specific TDL/MPAS READY conversion, not a generic two-whip adapter. It requires two SS17 whips; SS25, SS58, MIL WHIP, M25-COIL, MCC 2.0, and unmatched third-party whips are not substitutes. CHA TDL loop operation and CHA V-DIPOLE operation are separate configurations, not simultaneous modes. The add-on may participate in the documented TDL HUB/SURVEYOR-A modular path, but that does not make every TDL component part of the radiating V configuration.

The current User Guide, Quick Start, and flysheet control assembly, band states, tuning, and limits. Governed NEC models illustrate normalized 40- and 30-meter pattern shape for the exact two-M-COIL geometry. The physical Hairpin Match is excluded from the solver, so the models do not prove impedance, installed SWR, efficiency, realized gain, coil/Hairpin loss, range, or performance at another site.

CHA URT1 MB: place and support the remote tuner at the vertical feed point

CHA URT1 MB is the mounting bracket that mechanically joins a CHA URT1 Tuner Unit to a documented 3/8-24 support and radiator arrangement. Its principal job is to put the weather-resistant matching network outdoors at or near the antenna feed point, where it can tune the actual radiator without leaving a long, high-SWR coaxial section between tuner and antenna.

The bracket is not the tuner, radiator, transformer, ground, counterpoise, choke, or mount. It has no independent frequency, matching range, memory, power, efficiency, wind, or structural-load rating. Electrical limits belong to CHA URT1 and the completed antenna; mechanical limits belong to the chosen support and installed geometry.

Documented bracket roles

The URT1 Applications Guide also documents URT1 with EMCOMM, SKYLOOP, other coax-fed antennas, single-wire antennas, balanced-line systems through a suitable current BALUN, and a mobile whip. Those are URT1 applications, not automatic URT1 MB installations. Use this bracket only where its support geometry, connector clearance, return path, and mechanical loads are documented or separately approved.

Included and required items

The controlled Quick Start shows the L-shaped machined bracket, vertical mounting rod and head, two round-head bolts, washers, lock washers, and nuts used to attach the Tuner Unit's top mounting tabs. Assembly requires a 3/8-inch open-end wrench and a 1/8-inch hex wrench.

The flysheet explicitly says SS17, SS25, URT1, SPIKE MOUNT, and UCM are not included. It also depicts the tuner and spike as not included. A direct-fed vertical additionally needs an operator-made four-inch insulated stranded jumper, 14-20 AWG, with a 4 mm banana plug on one end and a 1/4-inch ring terminal on the other. The bracket does not supply the counterpoise, tuner-to-coupler coax, Coupler Unit, 12-14 V supply, or station patch cable.

For a coax-fed HYBRID arrangement, use an appropriate short coaxial jumper between the URT1 ANTENNA connector and the matching unit. Do not substitute the direct-feed banana/ring jumper for that coaxial path.

Inspect before assembly

Inspect the bracket, rod, head, side banana jack, 3/8-24 upper and lower threads, Tuner Unit tabs, bolts, washers, lock washers, nuts, and every electrical jumper. Stop for a bent bracket, cracked or loose jack, stripped thread, missing locking hardware, corrosion that prevents a sound joint, damaged tuner tab, cut insulation, loose terminal, or coax damage.

Identify the intended electrical path before mounting anything. Direct Beehive feed and coaxial ANTENNA feed are mutually exclusive. The current URT1 guide says the Beehive and ANTENNA connectors cannot be used at the same time. Confirm the radiator, feed component, return path, support, band plan, and lowest completed-system power limit.

Select a location clear of overhead utilities and uncontrolled conductors. Account for the fully extended whip, wind, people, animals, vehicles, and the fall radius of the complete assembly. A clampable surface must support the UCM and antenna loads; soil must safely accept the SPIKE MOUNT. URT1 MB itself does not create a wind or load approval.

Attach the Tuner Unit

1. Place the two round-head bolts through the two holes in the L-shaped portion of URT1 MB.
2. Align the holes in the Tuner Unit's top mounting tabs with those bolts and mate the tuner to the bracket with the Beehive connector on top.
3. Install a washer and lock washer on each bolt.
4. Thread a nut onto each bolt and tighten with the 3/8-inch wrench while restraining the bolt with the 1/8-inch hex wrench.

Seat the tuner squarely against the bracket. Do not trap a cable, distort the mounting tabs, or use the tuner case as a handle for the assembled antenna. Recheck clearance around the Beehive, ANTENNA, COUPLER, Ground, and cable bends.

Install the support before the antenna

For a SPIKE MOUNT installation, drive the bare spike into the ground using a rubber or plastic mallet, then thread the bottom of the URT1 MB rod into the spike. Never drive the assembled bracket, tuner, or whip by striking or pushing on them.

For a UCM installation, secure the UCM to a structurally suitable flat or round support according to its guide, then thread the bracket into the documented 3/8-24 interface. Confirm that the support cannot rotate, slide, or place the radiator within reach of people or conductive structures.

Hand-tighten the threaded joints until snug without cross-threading. Do not use the long rod, tuner body, or telescoping whip as a lever. Reassess stability after cables and the fully extended radiator add side load.

Direct Beehive-fed vertical

Build the four-inch jumper from 14-20 AWG stranded insulated wire. Fit a 4 mm banana plug to one end and a 1/4-inch ring terminal to the other. With the system de-energized, insert the banana plug fully into the jack on the side of the bracket head and secure the ring terminal at the URT1 Beehive connector.

Thread SS17 or SS25 into the bracket's top 3/8-24 socket and tighten by hand until snug. Connect the required ground or counterpoise wire to the URT1 Ground connector; the URT1 guide says a single 27-foot counterpoise is satisfactory for most 80-meter HOA Special installations. Connect the uninterrupted tuner-control coax from the Coupler Unit to the URT1 COUPLER connector, then fully extend the whip.

Do not connect anything to the URT1 ANTENNA connector in this direct-fed state. The short jumper is the radiator feed connection, not a ground strap. Keep it clear of sharp bends, moving hardware, and strain from the whip.

HYBRID coax-fed vertical

Mount the tuner and bracket as above, but leave the Beehive terminal unused. Install the selected HYBRID-MICRO or HYBRID-MINI and radiator in the exact documented stack. Join the URT1 ANTENNA connector to the HYBRID's coax input with the short coaxial jumper shown in the Quick Start.

Preserve the HYBRID configuration's return-current system and lowest power limit. The bracket does not turn HYBRID-MICRO into HYBRID-MINI, authorize an arbitrary radiator, or remove the need for an RF-return plan. Do not connect both the coaxial jumper and direct Beehive jumper.

Coupler path and tuner operation

The coax between URT1 Coupler and Tuner Units carries RF, control signals, and DC from the bias-T. No amplifier, switch, diplexer, meter, choke, lightning arrestor, or other device may be placed between those units. Such a device can block control, short the DC supply, damage the tuner, and void the warranty. Station accessories belong on the transceiver side of the Coupler Unit unless their controlled instructions state otherwise.

Power the Coupler Unit from the guide-specified 12-14 V supply, set the radio to the desired frequency, bypass its internal tuner, and tune with a continuous carrier between 0.5 and 15 W. Key the transmitter, tap TUNING, and unkey when the cycle completes. A one-second green COMPLETE indication means success; a quick green flash means failure. Memory recall may be very fast, but every changed frequency or configuration still requires an acceptable measured result.

Use the current governed URT1 limits: 125 W maximum on HF SSB/CW, 100 W maximum on 6-meter SSB/CW, and 30 W maximum on digital or other high-duty modes. The lower limit of the radiator, HYBRID, feed line, connectors, mount environment, and completed system controls.

Troubleshooting and recovery

The assembly moves or leans. Stop transmitting and lower it. Check the support, spike soil, UCM grip, threaded joints, tuner-tab fasteners, cable strain, whip leverage, and wind. Do not solve a structural problem by overtightening the tuner tabs.

Direct-fed vertical will not tune. Confirm the banana plug is fully seated, the ring terminal is secure at Beehive, ANTENNA is unused, the whip is continuous and fully extended, the counterpoise is connected to Ground, and the Coupler path is uninterrupted.

HYBRID path will not tune. Confirm Beehive is unused, the short coax is on ANTENNA, the correct HYBRID and radiator are assembled, the return path is present, and no prohibited device is between Coupler and Tuner.

ERROR remains red. Remove Coupler power immediately. Inspect the coax between Coupler and Tuner for a short and verify the correct ports. Do not repeatedly power a known fault.

SWR changes when cables move. Inspect loose connectors, a damaged direct jumper, coax strain, common-mode current, and an incomplete return path. Cable movement sensitivity is evidence of a changing electrical system, not a tuning technique.

For recovery, turn off and disconnect the station, collapse the telescoping whip from the bottom under control, remove cables and return conductors, detach the antenna stack, then remove the bracket and tuner from the support. Clean and dry all hardware. Protect the banana jack, threads, fasteners, tuner ports, and jumpers during transport. After a fall, arc, overload, water intrusion, or forced joint, inspect and electrically test the entire system before reuse.

The May 24, 2026 URT1 MB Quick Start controls the bracket assembly and the two illustrated feed paths. The matching flysheet controls the bracket purpose and not-included items. The July 29, 2026 URT1 User Guide controls the complete tuner installation, direct-feed jumper construction, counterpoise, Coupler path, tuning, troubleshooting, and electrical limits. The June 12, 2026 Applications Guide controls the named MPAS, BV, TDL, wire, and related URT1 conversions; it does not turn every URT1 application into an approved URT1 MB structure.

CHA BV or CHA PRV 2.0?

Choose CHA BV when modular radiator and fixed-coil choices fit your operating style. It suits an operator who wants a mechanically straightforward resonant vertical and values reuse of familiar MPAS Ready parts.

Choose CHA PRV 2.0 when you want the MCC 2.0's continuous field adjustment and the system's broader set of packaged configurations. It provides a deliberate path from compact base loading to taller center-loaded arrangements.

Choose neither solely because of maximum power or minimum SWR. Compare bands, frequency-change speed, footprint, height, setup time, carried weight, and adjustment method.

If rapid frequency changes without mechanical retuning are the priority, compare either radiator architecture with a guide-defined CHA URT1 path. That becomes a remotely tuned system and must follow URT1 connection and power rules.

POTA and field deployment: repeatability wins

A good portable vertical is the one you can erect safely, tune quickly, and reproduce before operating time disappears. Pack the system as one kit: radiator, loading or tuner component, mount, counterpoise, coax, analyzer, weather seals, stakes, and current guide.

Choose the band plan before leaving. A BV or PRV operator should know component order and starting setting. A URT1 operator should rehearse antenna-side geometry, power, and tuning, then verify saved memories at the new site.

Keep radials visible and controlled in public areas. Do not trade stability for a few extra feet of height when wind, soil, or traffic makes the taller setup unsafe.

A ten-minute pre-transmit routine

Walk the full system before keying: support, radiator joints, loading or tuner component, radial plugs, coax connectors, cable route, and public clearance. Sweep the intended segment or complete a low-power URT1 tune. Then listen before transmitting and begin at the minimum power needed for the contact.

When a field setting works, capture only the facts needed to reproduce it: product and radiator, band or frequency, coil or tuner state, counterpoise layout, mount, and site condition. This is an operator note, not a laboratory worksheet.

HOA and restricted-property use: concealment changes the installation

A patio, flower pot, fence line, balcony, or temporary yard location can make a vertical practical where a permanent tower is not. It can also place the radiator near walls, gutters, wiring, vehicles, and people. Every concealment decision is therefore an RF and safety decision.

The URT1 HOA Special is useful because the whip can remain mechanically unchanged while the tuner changes bands. The return path still matters, and a counterpoise routed differently each day can change the load. Record the arrangement that works and verify it after moving furniture, vehicles, or landscaping.

Temporary does not remove local rules, lease terms, RF-exposure responsibilities, or lightning risk.

Design for the daily setup, not the perfect setup

A system that performs well only when a counterpoise crosses a doorway or the whip is within reach of a power line is not a usable HOA solution. Choose a repeatable route that can be deployed and removed without improvising around people, pets, vehicles, sprinklers, or shared space.

Photograph the safe geometry for your own reference, mark the permitted wire route, and recheck tuning when seasonal moisture, metal furniture, parked vehicles, or landscaping changes. Concealment is useful only when it remains electrically stable and physically responsible.

Emergency communications: build a rehearsed system

Frequency agility is valuable only when the station can reproduce it under pressure. For a resonant system, label band settings and pack every coil, key, radial, and adapter. For a URT1 system, standardize radiator and counterpoise, protect the powered coax path, and confirm the DC source.

Rehearse failures: a damaged radial, wet connector, lost adapter, no tuner power, or one frequency that will not match. Decide the safe fallback before deployment. A second simple resonant antenna may be a better backup than more complexity in the primary path.

Document station power limits, duty cycle, and modes. Digital traffic creates more average heating than voice. The lowest-rated component controls.

Standardize what another operator must be able to reproduce

Label the radio-side and tuner-side coax, the intended antenna output, each radiator, and the return conductor. Keep the current guides with the kit. An operator taking over in the dark should not need to infer which connector carries control power or which coil setting belongs to another radiator.

Exercise the fallback as seriously as the primary system. If URT1 power is unavailable, know which resonant configuration can be erected with the remaining parts. If a radial is damaged, know the safe replacement. A documented fallback reduces pressure to operate a hot, unstable, or partially assembled system.

Troubleshooting CHA BV and CHA PRV 2.0

Resonance is below the band

The system is electrically too long. Confirm the correct coil and component order, then shorten only the guide-defined adjustable element in small steps.

Resonance is above the band

The system is electrically too short. Lengthen the allowed radiator adjustment or move the MCC tuning tube in the guide-defined direction.

The SWR minimum is shallow

Inspect return path, connectors, loading component, and measurement setup. Loss can flatten a response. A shallow minimum is not automatically fixed by chasing a perfect number.

The setting changed at a new site

Compare soil, moisture, radial placement, mount, height, nearby metal, and coax route. Restore the original geometry before changing the radiator.

The reading jumps when touched

Stop transmitting. Check threaded joints, banana plugs, coax connectors, damaged cable, and unstable connections. Human touch also adds capacitance; make adjustments with the operator clear.

Safety and stop-work conditions

Never install an antenna, wire, mast, or support where it could contact a power line. Assume every overhead conductor is energized. Keep enough distance that a falling whip, mast, wire, or tool cannot reach it.

Control access to radiator, counterpoise, balanced line, and feed-point hardware. RF voltage and current can cause burns. Evaluate RF exposure for actual frequency, power, mode, duty cycle, geometry, pattern, and public-access conditions.

Stop for lightning, rising wind, unstable supports, arcing, smoke, damaged insulation, unexpected heating, water intrusion, a red URT1 ERROR indication, or unexplained SWR movement.

Carbon-fiber supports can conduct electricity. Metal tripods, vehicles, railings, and mounting hardware can carry RF or fault current. Electrical bonding, lightning protection, RF return current, and common-mode suppression are related but separate jobs.

Glossary

BALUN

A device used in a balanced-to-unbalanced transition. A current BALUN also helps control unwanted common-mode current.

Bias-T

A circuit that combines DC or control with RF on one coaxial path and separates them at the other end.

Common-mode current

Current on conductors that does not form the intended equal-and-opposite transmission-line pair, often including the outside of a coax shield.

Counterpoise

A conductor or conductor system that provides an RF return path for an unbalanced antenna.

Electrical length

Conductor length expressed relative to wavelength and modified by loading, conductor dimensions, insulation, and surroundings.

Feed point

The location where RF power is delivered to the antenna system.

Loading coil

An inductor used to change electrical length and bring a physically short radiator toward resonance.

MPAS Ready

Chameleon's modular mechanical and documented compatibility concept. Mechanical fit alone never establishes an electrical configuration.

NEC

Numerical Electromagnetics Code, used to model current and radiation for defined wire-antenna geometries and environments.

Reference plane

The exact location in a system at which impedance, SWR, or another electrical quantity is defined or measured.

Resonance

A condition at a chosen reference plane where net reactance is near zero. It does not automatically mean 50 ohms or high efficiency.

SWR

Standing-wave ratio, a measure of mismatch on a transmission line at the measurement plane.

UNUN

A transformer or transition between two unbalanced systems.

Useful equations and bounded examples

Free-space wavelength

Wavelength in metres ≈ 300 ÷ frequency in MHz. At 7.1 MHz, one wavelength is approximately 42.3 m and one quarter wavelength is approximately 10.6 m. A much shorter whip therefore needs loading or a different matching strategy on 40 m.

Approximate quarter-wave starting length

Length in feet ≈ 234 ÷ frequency in MHz. This is only a starting estimate. Conductor diameter, loading, ground, mounting, and surroundings change the installed result.

Reflection coefficient from SWR

|Γ| = (SWR − 1) ÷ (SWR + 1). At 2:1 SWR, the magnitude is about 0.333. This describes mismatch at the reference plane; it is not the fraction of transmitter power the complete station permanently loses.

Electrical height

Height in wavelengths = physical height ÷ wavelength. Comparing in wavelengths is more useful than comparing raw feet across different bands.

Sources, authority, and revision control

Product-specific content was reconciled against the CHA MPAS 2.0 Manual; CHA MPAS Lite User Guide dated July 21, 2024; MPAS Ready Product Guide dated July 25, 2025; CHA BV User Guide dated April 23, 2025; CHA PRV 2.0 User Guide dated May 4, 2026; CHA V-DIPOLE User Guide dated April 30, 2026; CHA URT1 User Guide dated July 29, 2026; URT1 Applications Guide dated June 12, 2026; CHA URT1 Ladder-Line Field Guide dated July 30, 2026; and CHA URT1 MB Quick Start dated May 24, 2026.

The controlling CHA URT1 product-owner policy is: HF SSB/CW 125 W maximum; 6 m SSB/CW 100 W maximum; digital/high duty 30 W maximum. The lowest applicable rating of the tuner, BALUN, feedline, connectors, and completed system controls. This supersedes older 120 W wording until corrected official revisions are issued.

General RF principles were checked first against The ARRL Antenna Book for Radio Communications, 24th edition—especially vertical-antenna, ground-system, loading, feed-line, matching, and measurement material—the ARRL Handbook for Radio Communications, Thomas A. Milligan's Modern Antenna Design, and Jerry Sevick's Transmission Line Transformers: Theory and Practice, 5th edition for BALUN, UNUN, balance, and transformer principles. Those references explain engineering; they do not authorize a Chameleon product combination.

The public gap audit also checked ARRL's current Verticals, Grounding, Transmission Lines, and More About Antenna Tuners resources, plus the FCC's RF-exposure rules and guidance. These links provide accessible background; the controlled Chameleon guides remain authoritative for Chameleon hardware.

Each governed product record preserves aliases, current and superseded documents, source checksums, CKB destinations, NEC evidence boundaries, lifecycle status, and human approvals. The newest approved Chameleon product guide controls assembly and safety. This handbook supplies explanation and navigation; it does not replace the guide.

Revision: 1.3.0 candidate · 2026-09-09. Adds first-class MPAS Ready, CHA MPAS 2.0, CHA MPAS Lite, component-role, and governed NEC coverage while preserving the approved EFHW pilot pattern: one substantial source-governed guide, stable section IDs, focused deep links, customer-first explanations, and explicit evidence boundaries. Human desktop and mobile approval is required before this revision can replace the published handbook.