Versatile, Dependable, Stealth and Built to Last.

  • Stacks Image 6047
  • Stacks Image 6049
  • Stacks Image 6051
  • Stacks Image 6053
  • Stacks Image 6055
  • Stacks Image 6057
  • Stacks Image 6059
  • Stacks Image 6061
CHA F-LOOP

3.5-29.7 MHz

The F-LOOP was designed with weight, durability, portability, versatility and cost in mind.

The unique craftsmanship of the CHA F-LOOP distinguishes itself from the competition. The antenna is built to last.

The unit covers everything between 10M to 60M (or 29.700MHz to 5.300MHz) continuously & 30M to 80M with the 80M Kit assembled. The 80M kit can only be used with the coax cable. The High Efficiency Aluminum Loop DOESN’T COVER the 80M band and the 80M kit isn’t compatible with the High Efficiency Aluminum Loop.

A single switch is used to tune the F-LOOP from 10M to 30M or from 40M and 60M.

The F-LOOP can be assembled and operated under 3 minutes.

The unit radiator is made of LMR-400.

The coupling loop is made of an aluminum bar which is supported by a proprietary screw together hardline feeder.

Our specially and uniquely designed hardline feeder prevents SWR fluctuations if the antenna is rotated or moved on itself which greatly facilitated antenna tuning & operation.

The base of the unit is equipped with an anodized aluminum plate for tripod assembly and for table top stability.

The F-LOOP antenna is fed from the rear of the unit by a SO-239 with the provided coax cable.

The provided 12’ coax cable is equipped with an integral RFI choke that will prevent or eliminate any possible RFI problems.

The front panel of the tuning unit is made of a clear piece of polycarbonate which protects the tuning quadrant indicator.

The unassembled antenna comes into a high quality MOLE tactical bag for easy carry and storage.

Each side of the tuning unit has been fitted with a custom designed aluminum “L” shaped bracket that will be used to hold the optional 36” diameter collapsible aluminum loop radiator.

The optional 36” diameter collapsible loop radiator is made of 1” aluminum pipe and IS NOW MADE OF 2 SECTIONS INSTEAD OF 3. Each joints of the collapsible loop are made of high tolerance aluminum connectors that minimize RF losses. With that collapsible loop the F-LOOP will cover 10M to 60M.

Radiation efficiency is not related to the loop size. Loop antenna efficiency is determined by the conductor tube diameter and its electrical conductivity. It’s for that reason that the CHA F-LOOP Plus will be more efficient than any other portable loops on the market: AlexLoop, W4OP Loop and of course the Alpha Loop.

Larger magnetic loop > 36” in diameter made of soft coax cable like LMR-400 will exhibit some mechanical issues while operated in the field:

  1. Larger loops are less stable and will require a steady and safe support.
  2. Larger loops require more real estate to be operated.
  3. Larger loops offer a greater surface which increases wind resistance and possible SWR fluctuation and tuning issues.
  4. Larger loops made of LMR-400 have more weight and will have tendency to sag over time thus changing loop symmetry, radiating pattern and radiating efficiency.
The following data has been obtained by using Steve Yates AA5TB (Electronics Engineer from Lockheed Martin Aeronautics) calculator:
http://www.aa5tb.com/loop.html

Frequency

CHA F-LOOP Basic Kit
CHA F-LOOP 15M to 60M Boosting Kit for Homesteading
CHA F-LOOP Plus
CHA P-LOOP

Loop Diameter (30.876") & Radiator Diameter (0.404") Efficiency
Loop Diameter (48") & Radiator Diameter (0.404") Efficiency
Loop Diameter (36") & Radiator Diameter (1") Efficiency
Loop Diameter (34.059") & Radiator Diameter (0.404") Efficiency
28.850
85.537%
NIL
95.808%
88.812%
24.940
78.034%
NIL
93.305%
82.664%
21.225
66.888%
88.358%
88.796%
73.056%
18.118
53.722%
81.348%
81.996%
60.909%
14.174
32.958%
64.876%
65.861%
39.754%
10.125
13.153%
36.266%
37.273%
16.894%
7.150
4.290%
14.412%
14.955%
5.674%
5.357
1.605%
5.776%
6.016%
NIL
3.700
0.890% (Double Loop)
NIL
NIL
NIL


EASY TUNING

1 - PEAK SIGNAL IN RECEIVE WITH THE TUNING KNOB.
2 - ADJUST MINIMUM SWR IN TRANSMIT
3 - REPEAT THESE STEPS WHENEVER CHANGING FREQUENCY.



________________________________________________________________________________________________________________________________________________________

Specifications:

  • Frequency: 10M – 80M (80M with LMR-400 80M converter kit ONLY)
  • Power: 25W SSB or 10W CW
  • RF Connection: SO-239

________________________________________________________________________________________________________________________________________________________


The antenna system consists of:

1 X CHA F-LOOP Matching Box (F-LOOP & F-LOOP Plus)
1 X LMR-400 Coax Cable (F-LOOP & F-LOOP Plus)
1 X 80M Converter Kit (F-LOOP & F-LOOP Plus)
1 X 12' RG58A + Integrated RFI Choke (F-LOOP & F-LOOP Plus)
1 X Coupling Loop (F-LOOP & F-LOOP Plus)
1 X Screw Together Hard-Line (F-LOOP & F-LOOP Plus)
1 X Molle Bag (F-LOOP & F-LOOP Plus)
1 X Two sections Aluminum High Efficiency Loop (F-LOOP Plus ONLY)

Stacks Image 6111
Stacks Image 6115
________________________________________________________________________________________________________________________________________________________







________________________________________________________________________________________________________________________________________________________




$399.00


Out of Stock


eham-logo270x102


star-512



Stacks Image 860