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For HF I found this article: http://www.ad5x.com/images/Articles/FrontEndProt.pdf all of which makes good sense. But at rising frequencies won't the limiting diode junction capacitance to ground provide a significant path to ground, so reducing the hard earned received signal?
At the moment I'm planning on a horizontal beam for DATV and a similar one for talkback, but vertical. 'Theoretically' that should give 30dB of attenuation, possibly more depending on actual sidelobes and how they interact etc.
I picked up some DowKey coaxial relays at the recent CATS bazaar and their spec is -40dB isolation and have a good supply of the RS coaxial relays that they used to sell which probably have a similar spec.
How have people set up their receiver(s)(such as Minitiouner, RTL or Pluto) and the matching band linear amp / antenna?
Lots of quality RF relays and sequenced switching (Like Portsdown already does) or what?
Comments and guidance very welcome - I've not killed anything YET, mainly by swapping leads over. But not the ideal solution....
On 23cms I do not trust to a relay as I have had preamps fail using the usual SMA GHz relays ...doesn't take long to screw unscrew an N connector!
For 23cm repeater look through I have two yagis physically separated by < 1 M and an interdigital filter on rx leg..all works well.