Bill,
I have the temp probe for the electronic Sunbeam cooking thermometer
in the amp's airflow and it does a really nice job of displaying
current temps. I have it set so if the temp of the exhaust goes over
150, it beeps just like the Turkey is done. It would be ideal if
there were a usable output from it to trigger a SS relay to switch
wipers on the wire resistor to change fan speed as the thermometer is
sitting on top of the amp & piggyback rather than internal works fine
for this.
I think the only thing I don't like about the piggyback/external
thermostat approach is Murphy's Law of something getting dislodged,
internally mounted, that wouldn't happen.
73,
Gary
KA1J
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Wed, 14 Sep 2016 21:38:54 +0100, Ian wrote:
>
> >One of the boards is used
> >inside a transceiver
>
> REPLY:
>
> Inside a transceiver is one thing, inside a high power amp is
> something else. I'd suggest mounting it outside the cabinet, directly
> in the exhaust air stream. Even then check carefully for RFI to the
> unit affecting the speed and RFI from the unit heard in the receiver.
>
> These units almost certainly apply DC to the thermistor, so if
> necessary you can mount the thermistor (heavily capacitor bypassed) in
> the air stream and the rest of the unit in a shielded box somewhere
> else.
>
> Great suggestion Ian, thanks!
>
> 73, Bill W6WRT
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