Topband: Vertical Antenna Question

[charles Lewis]

Rick's suggestion of using a 160M "T" as a voltage fed antenna on 80M worked great for me at S9SS.   In fact, one night the DX Summit spots were debating whether I were real or a pirate because my 80M CW signal was so strong in the US.  By the way, some folks call that configuration an "inverted ground plane."  
 
I used an old DPDT relay from an AM band ATU to switch remotely between two tuning networks, one for 160 and one for 80, located in a box out at the feed point in the field.  There are probably better ways to do it, but I just used a resonant parallel RC circuit to get the large impedance transformation I needed for 80M.  I tapped the feed from the coax across a few turns at the cold end of the coil.  I could move between the CW band and the phone band on 80M by walking out there and making a just a small change in the (marked) capacitor setting.
 
 
73,
Charles Lewis - KY4P
 
ex A22AA, S92SS, SV0LM, S9SS
(and K4OVA long ago)