Mark,
Running? at 175C is way too hot for any reliability.
Keep it cooler.? That means more heatsink as you pay a
2.5degreeC/per watt of heat dissipated price for the part.
At over 100C you need to seriously derate the part of it?
so it will survive.
Reminder at 10W out you doing about 10W of it as heat.
Its not a lot but you have to get it out of the part and that
is harder.? SSB its not that bad for acerage power but at
FT8 full bore, fans!
So to stay cool you need a heatsink that stays much cooler
say under 45C (about 112F) measured as then you have
a bit of headroom.
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