The problem occurs when the counterpoise doesn't provide a low impedance
path for RF. If the problem occurs on a specific band, then try a
counterpoise that is about 1/4 wavelength long on that band. You can add
one in addition to the existing counterpoise, if that one is working
properly on the other bands. You might have to play with it because the
appropriate length of a wire lying on the ground will not be the same as
one in the air.
Regarding ratings, you are lucky if "100w CW" actually means 100 watts
at 50% duty cycle! It certainly doesn't mean 100w continuous.
73,
Victor, 4X6GP
Rehovot, Israel
CWops #5
Formerly K2VCO
https://www.qsl.net/k2vco/
On 20/11/2021 20:09, Julia Tuttle wrote:
Hi folks,
I was tinkering with a whip + counterpoise antenna connected to my KX3 by a
short stretch of coax with BNC connectors a couple nights ago, and
discovered (painfully) that there was quite a bit of RF coming back along
the ground when I bumped the outside of the antenna connector. I know from
experience that the KXPD3 can end up tingly in turn, and I'd like to avoid
that.
If this were a fixed antenna, I'd just slap one of the LDG RU-1:1 ununs on
it as a choke, but they're pretty chunky -- they're rated for 100 W CW, and
have SO-239 connectors, which would require adapters on both sides in this
setup.
Does anyone know of a choke more appropriate for this kind of setup? I'd
prefer something smaller (rated for maybe ~40-50 W continuous?) and
natively BNC, so I don't need to juggle adapters.
More broadly, is this the appropriate way to fix this problem? This was
with the counterpoise extended as best I could, and with the radio powered
from mains (which may have actually made the problem *worse* by providing a
more attractive path than the counterpoise?).
(As an aside, when components like baluns/ununs or tuners are rated as "100
W CW, 200 W SSB", do they mean literally a continuous wave, or do they mean
CW at a standard Morse duty cycle of roughly 50%?)
Thanks and 73,
Julie
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