Chameleon Antennas CHA DIY MAGNETIC LOOP STARTER KIT – My Build Project

Tireless Carl has been very busy with various magnetic loop antenna. He has the F Loop , the P Loop, and newer 2.0 variants for sale. They are solid, built to last and very much milspec and built in a state of the art manufacturing facility.

I have several of the jawmounts which are a multi-purpose antenna calamp/mount that can be used in many ways and the CHA Hybrid is another awesome antenna.

I have had my Chameleon V4 Mobile HF antenna as a trusty mobile and man pack companion for my Yaesu FT-817 and Icom 703 QRp rigs.

So Carl wanted to help the DIY hams that prefer to build than buy with a kit of high quality parts that can be used for epxerimentation.

http://chameleonantenna.com/ACCESSORIES/ACCESSORIES.html. The kit comes with the following:

1 X PRE-ASSEMBLED CAPACITOR

  • 600 Vrms MAX
  • 12.5 pF MIN – 432.5 pF MAX PER SECTION
  • 2 SECTIONS TOTAL
  • 6:1 DRIVE (3 TURNS MIN TO MAX) INSTALLED
  • TWO WIRES PRE-SOLDERED WITH TERMINALS
  • CAPACITOR INSTALLED ON A PRE-DRILLED MOUNTING PLATE
  • KNOB INSTALLED

1 X 12′ LMR-400 4 X SILVER PLATED PL-259 2 X SO-239

Those capacitors are the same that are used in the commercial version of the CHA F-LOOP and the CHA P-LOOP from Chameleon Antenna. The components are very high quality and the gear drive on the capacitor is silky smooth. The critical part is the capacitor in this project and its attached gear drive. Carl has already mounted it on a plastic base and soldered up the leads to simplify your installation. Add a box and some mounting hardware and you are ready to go. It is important to use silver plated high quality connectors due to the high voltages that are part of the loop design.

How you wish to build the system is up to you and Julian OH8STN has put forward a video to explain his version of using the kit.

http://oh8stn.org/blog/2017/02/09/diy-man-portable-magnetic-loop-antenna/

I will post his Youtube video at the bottom of the post

 

Here are my photos of my work in progress. Almost there to getting it on the air

20170415_144904

The basic kit

20170415_144940

I already built the coupling loop (will make a coax version as well) so i added the center pole and a box

20170416_085024

Ok trying to fit the capacitor into the box and had to do some minor trimming of the base so it can slide in. The box is a 4×4 electrical box from Home Depot

20170416_085004

Drill out some holes and you are ready to assemble and measure thrice and drill once

 

I had already made up the main loop and had shorted out the center conductor and the shield as per Julian’s video below

 

More pictures of the loops at the HRO store in Oakland. Janet the manager was kind enough to allow a basic demo of the antenna.

 

HRO Anaheim (6)

HRO Anaheim (11)HRO Anaheim (12)HRO Anaheim (13)HRO Anaheim (14)

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