Petr, I put the diodes before a common mode choke which I think is the right 
place for them to be as the choke will isolate the front end of the preampĀ  
from the diodes. If we were talking about uWaves, then it would be a big issue 
and one would use a relay to provide the isolation on TX and protect the 
preamp, but does it really make a difference on 160mĀ  and the nF ?
73John - M0ELS
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