[AMRadio] Protecting receiver (was WTB: Coax relay, 110VAC, aux contacts)

[C.L. Mitchell]

I have shorted the receiver antenna on transmit on every homebrew antenna relay I have built.  Even with 6AK5 or 6BA6 inputs, I still feel safer that way; the cheap insurance theory.  I do this even with 20 W rigs.
 
Mitch,  K9PNP
 

> Date: Fri, 18 Nov 2011 18:09:35 -0500
> To: amradio at mailman.qth.net
> From: wa1rkt at arrl.net
> Subject: [AMRadio] Protecting receiver (was WTB: Coax relay, 110VAC, aux contacts)
> 
> 
> Someone here suggested that instead of a coax relay, I just get a 
> DPDT 110-VAC relay and use that, and he suggested a Radio Shack part 
> number. So, today I stopped by the local Radio Shack and bought the relay.
> 
> Then it occurred to me... the relay gives me one set of contacts to 
> switch the antenna from transmitter to receiver, and another set to 
> connect to the Mute input on the receiver. I'm wondering if I should 
> have a third set of contacts to short out the receive antenna input 
> during transmit and protect the receiver front end. The receiver is 
> a Hammarlund HQ-180A and the transmitter is a barefoot DX-100B... do 
> I need any front end protection for the receiver?... perhaps a pair 
> of back-to-back 1N4148-type diodes across the receiver RF input?
> 
> Rick WA1RKT
> 
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