In my opinion, conditions such as soil conductivity , slope,
orientation, height, obstacles, metal structures, length of feed line
etc. vary so much it is almost worth just putting it up without getting
too deep into modeling. I definitely would model it, I modeled mine and
then just threw it up thinking it may not work a few bands. But, after
trimming it to 3.515 (my magic number, at my location), the K3 tuner can
tune it everywhere except 160 meters. Mine is a irregular triangle of
sorts with the point at 90 to 95 feet in a pine tree and the bottom
horizontal wire at about 50 feet. It is somewhere between horizontal
and vertical (the other two tree tie-offs are at about 50 feet) and fed
about 15' up one side. I run 120 feet or so (I trimmed it a couple of
times) of 450 ohm ladder line into a high power 1 to 1 current balun
outside of my shack and a 3' piece of high quality coax to my tuner.
This loop beats my 3 element Cushcraft triband at 45' on the high bands
about 80% of the time and has exceeded my expectations on 40 and 80.
Keep in mind it does not have the back or side rejection of the triband
beam on the high bands.
FWIW, I did try to orientate it so the the modeled lobes pointed in
desirable directions on the low bands. For example, one of the lobes on
40 meters should be pointed to Europe. It does work well to Europe from
the West Coast.
Richard
Does anyone have any information or a link to information data on an
80 meter loop's complex impedance and VSWR values across the HF bands?
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