Topband: Antenna Question, Sorry

[George (K8GG) & Marijke Guerin]

Kevin, Terry, etc.

I agree with the trap approach for 80 meters on an inverted-L for 160.  We 
did that about 10 years ago with an inverted-L up about 85 feet and out 
about 75 feet.  Putting the trap in just over 1/4 wavelength up (maybe 0.28 
wl) with the series capacitor should bring 80 meters in very close to 1:1 
SWR, and also work for 160.

Note that the typical 80 meter trap provides inductive loading on 160, maybe 
15 feet worth, so one may have to shorten the inverted L or play a bit with 
the series capacitor, or use a tuner as a line flattener.  In our case we 
used a 500 pfd, 5KV vacuum variable capacitor at the feed point, and a tuner 
at the station for fine tuning the SWR.
Good luck,

George    K8GG
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