[Elecraft] continuous relay click in RX ANT IN

[Tom W8JI]

Hi Vic,

> So the voltage produced by the receiving antennas is relatively low. I 
> agree that it wouldn't work with a resonant antenna.

On my Beverage antennas (which are low gain)  the accumulation of AM BC 
signals, SW BC signals, and so on at night is enough to light the filament 
of a 12 volt subminature lamp a dull reddish glow!! Really freaky to watch 
the filament brightness QSB up at night.

> But couldn't you just put several diodes in series, like this:
>
>   --+-->|------>|---+--
>     |--|<------|<---|
> if you want a higher clipping level?

You could, but I probably would not do that for several reasons (mostly 
related to IM performance and clamping harness). A much better solution is 
to use a zener-biased shunt clamp with fast diodes and a low current fuse 
made from a small low voltage lamp, but a voltage source is required to bias 
the zener.