Regardless of which image I am using, the temperature of the Node gets up to 150 F / 65 C or higher in the aluminium case even if there is no Node traffic.
If using the ASL3 image, the temp gets even higher when running an ASL3 update.
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I just re-ran temperature tests on my demo SHARI PiZero UHF node using the HamVOIP image.? These temperatures were measured using cpu_stats.sh found in directory?
/usr/local/sbin.? The ambient temperature of the room was abou 22 degrees C / 72 degrees F.
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The temperature cpu_stats.sh is measuring is the SOC (System on a Chip) temperature on the PiZero board.
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After more than an hour of operation in the receive mode I measured a stable 50.5 degrees C / 122 degrees F.
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After more than an hour of operation in the transmit mode (i.e. the SA818 transmitting continuously) I measured a steady 61.2 / 142 degrees
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Here are a couple of clips about Raspberry Pi CPU? temperature from the web
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Steve - N8AR
Steve-N8AR