Owen Duffy wrote:
Michael Coslo wrote in news:gvhhkj$do4m$1
@tr22n12.aset.psu.edu:

I'm starting up an old project that I never quite finished - my loop
antenna.

When I first put it together, I tried a simple loop of coax to couple
the radio to the loop. Was never really satisfied with that though.

I'm wanting to try a gamma match, possibly something a little like what
Owen Duffy posted a nice version of.

The Gamma match is fairly understandable to me, and I expect it to work
well.

What I am wondering about is in the coax loop coupling system, how is
the best match obtained? Loop size? orientation? Luck?

Mike, you haven't given much information about the loop (size,
frequency). Is loop balance / symmetry important?

It's Octagonal, .75 inch copper tubing, around 8 feet in diameter. It's
designed to just reach into the 80 meter voice segment with it's
capacitor setup. Upper end is either 17 or 15 meters. It's been a few
years since I worked on this, which is the reason for the "around" remarks.

Capacitor is a 4 tube trombone capacitor, each tube roughly a foot in
length. External tube is .75 inch, and internal tube is .5 inch.
Insulation is wrapped Kevlar sheet around internal tube.

Adjustment is via a power screwdriver and a threaded rod setup to move
the trombones in and out.

- 73 de Mike N3LI -