Topband: detuning shunt fed tower

[Jon Zaimes AA1K]

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