CHA M-COIL · Fixed loading coil for SS17 antenna configurations
Add 40- and 30-meter capability to the documented CHA BV/SS17 or CHA V-DIPOLE/SS17 setup.
Why operators make room for it
A portable antenna kit earns its space when the same hardware can do more. The CHA M-COIL adds fixed inductive loading to the CHA SS17 telescoping whip in the documented CHA BV and CHA V-DIPOLE configurations, giving operators a way onto 40 and 30 meters without carrying a full-size lower-band radiator.
Use one M-COIL in the CHA BV/SS17 vertical, or one on each arm of the CHA V-DIPOLE. The V-DIPOLE uses two coils and its Hairpin Match on 40 and 30 meters. These are distinct complete antennas, not a promise that the coil will work with every whip or matching unit that shares its thread.
Updated M-COIL units include side banana sockets for a short bypass jumper. On 20 through 6 meters, the documented system can use the coil removed or bypassed, with the whip adjusted for the selected band. That makes band changes more convenient without turning the coil into an automatic tuner or a multiband antenna by itself.
Quick product reference
For CHA BV, use the documented SS17 radiator, CHA BLANK feed assembly, mount, PUCK HUB/radials and coax with its RFI choke. For CHA V-DIPOLE, follow that guide for the two SS17 whips, two coils, hub, feed adapters, insulator, support and Hairpin Match.
M-COIL and M25-COIL serve different documented radiator configurations: the BV / SS25 40-meter path uses M25-COIL, not M-COIL. Do not substitute one for the other or select a configuration solely because its parts have 3/8-24 threads. This listing supplies one coil, not the complete BV or V-DIPOLE kit.
CHA BV User Guide: SS17 loading, assembly, radials and tuning
CHA V-DIPOLE User Guide: paired coils, Hairpin Match and band changes
Start with the dimensions in the complete-system guide and measure resonance with an antenna analyzer or at low transmitter power. Adjust the radiator for the intended frequency; ground conditions, radial layout, height and nearby objects can shift the result.
Disconnect the transmitter before installing, removing or bypassing the coil. Hand-tighten threaded joints without using the whip or coil body as a wrench. Stop for abnormal heating, arcing, loose connections or unstable SWR. Keep the antenna clear of power lines and people.
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Overall rating: 4.9583335 / 5 from 24 reviews.
Review topics: [].
"I add this coil to my 17ft whip for a TDL and it really helps manage the SWR. On 20m for POTA it, in my estimation, helps with TX and RX. I am pulling in weaker signals, that when it is not included in my antenna system set up, are not there. Good job on quality and performance."
"Quality material! Excellent addition to my massive collection of Chameleon products!!!"
"Excellent quality"
"Great products. Thank you."
"Awesome construction! Works great with the blank, SS17 and FSR."
"Good quality products. Good service. Repeat customer and will be back"
"Putting this into the mix of the SS17 antenna components permits quick increase in band options, Using the banana clips to make a jumper to leave the coil, physically, in the system, while electronically removing it is a blessing when expediency is desired."
"Great performance from a high quality small package. Kudos to the design team!"
"Excellent high quality manufacturing as usual from Chameleon Antenna and on air performance to match! Thank you! 73!"
"The order was a great experience. Product arrived timely and performed as advertised. Very high-quality product"
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