On 11/29/2012 8:42 AM, N1BUG wrote:
Often, while listening to such a noise on one Beverage, switching from
the vertical to a different transmit antenna (thus leaving the ~250
feet of coax feeding the vertical open at the shack end), there will
be a dramatic change in noise on the Beverage, depending on the
particular noise and Beverage selected. I take this as evidence the
vertical is re-radiating noise and that detuning it should help. Is
that a valid assumption?
73,
Paul N1BUG
Paul,
Sounds like you already have found the solution. I had a very similar
shunt-fed tower back in the '80s and discovered quite by accident that
by switching out the feedline in the shack I was detuning the tower and
noise on a nearby Beverage was greatly reduced. I just did the switching
manually but a relay keyed in sync with the TX would be a more elegant
solution.
73/Jon AA1K
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