Re: Which Radios to Switch On?
FWIW (which may not be terribly much) I recall from a previous existence that the thermally-induced failure rate of electronic components was given by the Arrhenius equation. The broad result is that the failure rate will roughly double for every increase in temperature of 10 degrees (the detail is far too tedious to type here but a quick Google will probably reveal chapter and verse if you are feeling masochistic). The bottom line is that a fan is good if it's outside the equipment and you can tolerate the noise but bad if it's internal because it has a large impact on the MTBF.
HFD