On 01/08/2012 04:46 PM, Lee K7TJR wrote:
> Paul you might want to be careful just shorting the
> receiver input. This would also put a short on the
> output of your preamp. This would have the preamp
> blasted with RF from your TX while trying to feed a
> short. My guess would be you could destroy
> preamps doing this.
Clarification: Actually what I had in mind was to place the short at
the input of the preamp. I want the preamp protected too. My only
concern is the preamp might want to oscillate with a short on its
input. I don't know whether these low frequency, medium gain preamps
are prone to that or whether it would harm anything if they did
oscillate. The 25+ dB gain, very low noise figure VHF/UHF preamps I
am more used to can get pretty squirrelly with something other than
50 ohms on the input.
73,
Paul N1BUG
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