|[AMRadio] Big Vertical on 75|
k4kyv at charter.net
Mon Feb 19 18:19:37 EST 2007
After 25 years, I finally tuned the 127' vertical to 75! Ever since I first
put it on the air in 1982, I have used it only on 160, as a quarter wave.
Up in the AM Ghetto, the half-wave high dipole seemed to be all I needed,
since DX wasn't really much of a possibility. I never had any problem
working into Europe with the dipole on CW.
With the expanded phone band and the possibility of working DX on AM, I
decided to see if I could make the vertical work on 75. I threw together a
simple parallel tuned matching network with a 400 pf bread slicer and an EF
Johnson edgewound coil I found in the junkbox. To my surprise and delight,
I was able to get the SWR down to 1:1 on the third try, of moving the point
where the feedline taps on to the coil. When I ran the transmitter up to
full power on AM, nothing arced over on voice peaks.
My first 75m contact with the vertical was today at mid-afternoon, with
Howard, W3HM. Can't wait till tonight to see what kind of signal reports I
get at various locations over the country.
This message was typed using the DVORAK keyboard layout.
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