Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF

[john at kk9a.com]

When I owned my P40A station I had a Pennant very close to my 160m TX  
vertical.  A K9AY preamp was at the RX antenna feedpoint with voltage  
fed though the coax. If I recall correctly I only shorted the RX line  
going to the radio during TX and left the preamp running.  Most of my  
operation was low power however I have run legal limit and had no  
issues.  What does the preamp manufacture recommend?

John KK9A


N4ZR wrote:

I'm in the process of building up a K9AY loop, using the Array Solutions
boxes, and it occurred to me that I probably need to work out some way
to protect the preamp in the shack-end box from transmitted RF,
particularly since the K9AY loop is only about 60 feet from the vertical
leg of my inverted L and I'll be running 1500 watts.

I can see maybe cutting off the DC to the preamp, but figure that won't
be enough. Alternatively, I can probably work out a way to either open
or short the feedline coming into the indoor box where the preamp is.
Any advice as to which would be best (opening or shorting)?  I only have
one spare transistor.

Advice much appreciated

-- 

73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.