OK, well I was going to incorporate a fan also onto the heatsink, which I had already planned but didn't mention. The fan is activated by the controller and comes on when the PTT activates and goes off 1 minute after the PTT drops. But, I have a feeling that the fan I have will not be adequate for long transmissions, but I am not sure. So I was going to hook up the thermal warning to the controller since I had a spare digital input. So, now with knowing I am using a fan, where on the heatsink should I place the sensor. Should I put it right near the heatsink bolt on the transistor or should I put it on on of the fins. I think closer to the transistor bolt, but let me know your thoughts.
Larry, N8RDT
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[EMAIL PROTECTED] wrote:
Henry Radio uses 125 degree thermo-switches on their commercial amps. If you check out their web page they sell the switches for $9.50 The switches are used to activate 12-V cooling fans on their amps.
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