Thanks for all the suggestions. I ordered an H4 and will experiment with an aluminum heat sink that bridges from the si5351 to the AIC 3204.
The si5351 was never hot to the touch, so it does not take much warming to set it off.
Gary AG7TH
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On 7/17/20 00:40, igor-m wrote:
I wonder what my options are, besides buying a new H4.
1) use a frozen watermelon
2) drill vent-holes into the case
3) glue a small heat-sink on the top of the SI5351 chip
4) relax the SI5351's overclocking (lower its frequency)
5) increase the SI5351's Vdd voltage, ie. by 0.1-0.2V
6) replace the SI5351
..
