On 18/02/2018 13:28, Jim GM4DHJ ... wrote:
can cold and high humidity affect soft off/on switching in a transceiver
that wouldn't affect a hard off/on switch? ....



In more extreme temp., starting from cold can be a problem- even with a
'hard' switch.

I've not seen it in amateur kit and it is generally at very low
temperatures- well below 0 C.


I'd hope the front panel is at least reasonable protected re moisture.
Moisture inside could be another matter. Soft start circuits are design
to drawn naff all current when 'off' and a bit of moisture could really
cause issues- lower Z where higher Z is expected.

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