Hello everyone!

There's now brand-new steel roof over me and time to put up a
vertical. Dont want to spent too much time over that slippery and
rather high roof messing with traps, so: planning to put up a fishing
pole (7 m long) and coil wire around it. Would like to use rig's
autotuner and short run of rg6 cable. Dont mind swr 5 or so. Played
with EZNEC and found that 12 m long radiator would present reasonable
impedances at 40, 30, 20, 17, 15. But, when my mast is 7m long, should
I coil 12 m or more wire around it?? Should I use capasitators at the
base of the antenna to to tune out reactances? Or can tuner do that on
the other side of coax? Anyone done something similar? Any comments?

Andrus

DrBrain wrote:
Played
with EZNEC and found that 12 m long radiator would present reasonable
impedances at 40, 30, 20, 17, 15. But, when my mast is 7m long, should
I coil 12 m or more wire around it??

Did you look at your radiation pattern on 15m with that
12m long radiator? TOA = 41 degrees. To get a 5/8
WL vertical on 15m, it shouldn't be that long.

Also coiling the wire may cause a nasty self-resonance
setting your frequency upper limit lower than you want.
--
73, Cecil http://www.qsl.net/w5dxp


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I am using a 32 ft gound mounted homebrew vertical with 30 radials of
whatever will fit in a 50 by 50 ft area
I feed it at the base with a 4 to 1 voltage balun and bypass the balun for
use on 40 meters.
swr anywhere from 40 thru 10 meters isnt over 3 to 1.
I feed it with 30 ft or so of good quality rg-8 coax and a little auto tuner
in the shack.
"DrBrain" wrote in message
om...
Hello everyone!

There's now brand-new steel roof over me and time to put up a
vertical. Dont want to spent too much time over that slippery and
rather high roof messing with traps, so: planning to put up a fishing
pole (7 m long) and coil wire around it. Would like to use rig's
autotuner and short run of rg6 cable. Dont mind swr 5 or so. Played
with EZNEC and found that 12 m long radiator would present reasonable
impedances at 40, 30, 20, 17, 15. But, when my mast is 7m long, should
I coil 12 m or more wire around it?? Should I use capasitators at the
base of the antenna to to tune out reactances? Or can tuner do that on
the other side of coax? Anyone done something similar? Any comments?

Andrus