Curious if the duty cycle of a stock (no aftermarket heat sink) KX3 differs when transmitting over the 2m transverter, versus keying up on the HF side of the rig?
HF can go as high as 15 watts, of course, whereas the 2m transverter maxes out at 3 watts. One might imagine that the very modest 2m output would translate into an extended duty cycle, but that has not been my experience. When transmitting, the 2m module rises in temp quite rapidly, to the point that I now monitor PA temp on the display when running our local VHF net. Backing down to 1 watt helps, but at an obvious price.
I’d be interested in any thoughts anyone has on the thermal relationships at play here.
73, Jeff K4YWZ
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