Thanks for all the very helpful replies and suggestions.
I'll change the BNC connector to a 4 hole F connector with 75 ohm output.
The design already has a 20 kA gas discharge tube and DC biased diode
limiter for lightning and surge protection. It also has an optional (by
internal link) diode limiter on the output so that it can be used by
"weak" SDR receivers such as the SDRPlay RSP series that cannot take
high RF levels.
I agree with the comment on adding a common mode choke on the coax
output. The amplifier device I'm using has very low noise so it needs
extra common mode isolation to allow use at very RF quiet locations.
I'm planning to take a trip to the nearest beach this weekend to try the
prototype in a very low noise location.
73, Chris G4HYG
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