[Elecraft] OT: Advice re: blocking RF from rx-only antenna

[David Herring]

Hi Everyone,

Yes, this is off-topic a bit, but I know there are some of you here who will be able to get me going in the right direction.

I have a PixelSatRadio RF Pro 1A receive-only moebius loop antenna.  It is being used with a Kenwood TS-440S that does not have the provisions for a receive antenna like the K3 does.  In order to make sure one doesn't fry the antenna's pre-amp, I need a fool-proof way to ensure that no one ever accidentally sends RF down the coax to that antenna.

I have thought about maybe some kind of a PTT enabled antenna switch.

I have thought about some kind black box with a circuit one could build that would act as a gatekeeper to allow RF in from the antenna but block any going out.

I have searched the 'net and have not yet found anything along those lines that I could implement.

So my question to you is, can anyone here recommend such a switch or such a black box circuit?  Or maybe propose something else that I'm not even thinking of?  Any ideas, suggestions, recommendations?  



I need this to be on-the-cheap and I'm not opposed to homebrewing something here, though I only have modest-at-best skills in homebrewing.


Many many thanks,

Dave, AH6TD


I now return this reflector to normal programming, already in progress.  ;-)