Jim and all:
Interesting comments on the G5RV (I've never built one but have a
local friend that uses one).
For years I used wire dipoles on HF bands: I made a 80/40m trap
dipole, 80/40m dipole with removable clip at 40m length which we call
the "Iditarod Special" as it was simple to use at remote checkpoints
on the trail for changing prop day/night over 150-900 mi range in
winter. Sometimes the antenna was only 8-foot off the ground (high
as one could reach without ladder), but worked surprisingly well for
extreme NVIS.
I had a 80/40/20m fan inverted-V at home before putting up my tri-band yagi.
Now the inverted-V is 80/40m fan style. It works better on 3800-4000
than on 40m where bandwidth seems narrow. The center is fed with
commercial 1:1 balun at 40-feet and ends are 20-feet high which works
well for NVIS.
I can tune it higher than 7100 using my tuner which is a Drake
VN-2000 "oldie but goodie". The tri-band yagi also needs help
resonating which the Drake handles fine.
Accidentally my 600m inverted-L is 43 feet high. I have a 122-foot
long top leg of two parallel wires and the vertical is three parallel
wires. Base coil is 11x10 inch diameter fed near ground end with
coax. Ground radials are also very short for 472-KHz and consist of
2-foot wide by 50 to 70 foot long chicken wire lain on the
ground. Efficiency is 0.8 % but it works for both Tx and Rx, having
my signal been heard over 4,000 miles away in Buffalo, NY. Normal
ground-wave distance is about 250 mi running 100w output from
amplifier (converted NDB transmitter driven by my K3 at 0.1mw).
73, Ed - KL7UW
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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