One thing I tried during a recent contest was to set FAN CTL = 1 during 
the contest, or at least whenever I was CQing. The noise level stayed 
constant instead of jumping up and down with the PA temperature, and a 
constant noise level is easier to cope with. Outside of contests, I set 
FAN CTL = NOR, because the fan rarely if ever comes on then.

73,
Rich VE3KI


VE7XF wrote:

> During the SS CW, I was (for the first time) conscious of the fan noise
> when it went into 'high gear' during extended CQs. It did make the weak
> sigs more difficult to copy (even through my headset).

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