Austron uses an 8 conductor piece of ribbon type antenna rotor cable. They connected all 8 strands together so the loop was a single turn. They used a pot core transformer to help match impedance.
When I made my general purpose loop, I made an octagon shaped loop out of 3/4 inch copper pipe, and 45 degree elbows. I used a cast conduit box for the terminations, and a plastic PVC coupler to break continuity at the top of the loop. For the winding, I took a single piece of 25 pair CAT3 cable and soldered the wires to form a 50T loop. I put a toroid balun in the box to convert from 50 ohm unbalanced to 50 ohm balanced... I think? It works pretty nicely as an antenna for my HP3586C. -Chuck Harris J. Forster wrote:
When I designed mine maybe 20 years ago, I did consider using something like phone cable and ribbon cable, but there was a good performance reason for using the heavier wire. Sadly I can't recall why right now.
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