Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF

[Alan Swinger]

I use a Model 197 RF Limiter/Arrestor by Industrial Comms Engineers for my K9AY Loop. I think I got it from DX Eng ~ 10 yrs ago, but also chk w/ Array Solutions since I think they now handle the K9AY Loop. - Alan K9MBQ


-----Original Message-----
>From: N4ZR <n4zr at comcast.net>
>Sent: Oct 10, 2019 9:30 PM
>To: topband reflector <Topband at contesting.com>
>Subject: Topband: Protecting an Array Solutions K9AY Loop from Transmitted RF
>
>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
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