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

[amsctalx at comcast.net]

I used, until recently, a ELAD transmit/receiver switch to protect the front end of my auxiliary receiver. I know that MFJ makes at one model as well (MFJ-1708), perhaps two. The ELAD switch isn't normally available in the US, but is frequently available used and can be ordered from Europe. 

73, 


Mike Alexander - N8MSA 

amsctalx at comcast.net 

----- Original Message -----
From: "David Herring" <dave at ah6td.com> 
To: elecraft at mailman.qth.net 
Sent: Sunday, April 22, 2012 4:03:14 PM 
Subject: [Elecraft] OT: Advice re: blocking RF from rx-only antenna 

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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