can cold and high humidity affect soft off/on switching in a transceiver
that wouldn't affect a hard off/on switch? ....
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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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What exactly do you mean? Old transceivers with valves have capacitors in
them that need to be formed, and slowly bringing up the volts can do this
kindly, but sometimes they do still go bang and spread their contents of
silber bits and muck all over the innards.
I have an old valve amp and got away with powering that up after a few
years of cold with little issues though there is a slight hum, and an
occasional rustle but I feel this is not from the electrolytic.
More likely a dry joint, capacitor of the small type or a dodgy resistor.
Brian

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"Jim GM4DHJ ..." wrote in message
...
can cold and high humidity affect soft off/on switching in a transceiver
that wouldn't affect a hard off/on switch? ....
--
Resisting Freemasonry for 39 years .....
Fat Masons need love ...

On 18/02/18 15:32, Brian Gaff wrote:
What exactly do you mean? Old transceivers with valves have capacitors in
them that need to be formed, and slowly bringing up the volts can do this
kindly, but sometimes they do still go bang and spread their contents of
silber bits and muck all over the innards.
I have an old valve amp and got away with powering that up after a few
years of cold with little issues though there is a slight hum, and an
occasional rustle but I feel this is not from the electrolytic.
More likely a dry joint, capacitor of the small type or a dodgy resistor.
Brian


While your point re old valve sets is valid, they are unlikely to have a
'soft' on/off switch. Such things are a feature of more modern kit.

The dry joint etc you list are certainly possibilities. As is a cracked
PCB.

"Brian Reay" wrote in message
news
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.

thanks the FT450d was acting up wouldn't go off then wouldn't go on...fine
when in the house...I'm sure the guy who bought it won't have any
problems.......I was wondering where this post had went...wrong group as
usual.......have to watch what I'm doing.......but I got an
answer.......just another reason why I hate the FT450D ......