[TowerTalk] Elementary Rx protection question

[Bruce Jungwirth]

Pete,
I'm not sure if the diodes would degrade or not. Back in the 60's Drake used
a small incandescent bulb across the receive ant input to absorb high
amounts of RF. I had a TR3 & didn't notice any problems.

Bruce K0SON


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Pete
Smith N4ZR
Sent: Sunday, January 13, 2013 2:58 PM
To: TowerTalk
Subject: [TowerTalk] Elementary Rx protection question

Do back-to-back diodes across a receiving antenna degrade receiver 
performance before they begin to conduct?  what I'm considering is 
back-to-back series strings of diodes to limit RF voltage at the front 
end of an SDR.  My working assumption is that the conduction threshold 
could be set below the damage level but above the ADC clipping level, 
but if it affects performance before the ADC clips then that's no good.

-- 

73, Pete N4ZR
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