Bill,
I would try the LM34 with heavy bypassing of both the Power and output to
return. Keep your loops very small and then connect through both a common
mode and differential mode inductors at both ends of your temp metering
cable.
I'd also float the whole probe and run on a coin cell.
Tomm, KD7QAE
On Sunday, June 9, 2013, Bill Turner wrote:
> I would appreciate any suggestions for monitoring temperature on a solid
> state power amp. I have used the LM34 with success in the past, but not in
> the presence of strong RF fields. After all, it is a diode, sort of. :-)
> The thing I like about it is it reads out directly in mV per degree, so no
> calibration is necessary. Just connect a meter of the appropriate scale and
> off you go.
>
> It would work fine while not transmitting of course, so one option is to
> apply power only during receive but I'd prefer to have it on all the time.
>
> Are there any thermistors or related products which are not sensitive to
> RF?
> Something which can be fastened to the heatsink and read remotely? Any
> drawbacks to them?
>
> All ideas appreciated.
>
> 73, Bill W6WRT
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