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

[Don Wilhelm]

Dave,

That situation is dealt with routinely by VHF folks with mast mounted 
preamps.
Using a coax relay to connect the amplifier to the antenna and a second 
relay to connect the preamp to a 50 ohm load will usually provide 
adequate isolation.

73,
Don W3FPR

On 4/22/2012 4:03 PM, David Herring wrote:
> 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.  ;-)
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