I find that at an ambient temp. of about 17C, 75 W into a dummy load,
it takes about a minute and a half of CW at 18 WPM to raise the PA
temp from 23C to 37C, the temp at which the fans come on at the
slowest speed.
73
--
Joe KB8AP
On Dec 9, 2008, at 10:55 AM, Richard Ferch wrote:
The fan noise depends on the fan setting, which in turn depends not
only on
the duty cycle but also on the ambient temperature.
On mine (#1595), FAN1 is almost inaudible (almost completely drowned
out by
the noise of my computer's fan), FAN2 is audible but not obtrusive,
and FAN3
and FAN4 get progressively louder and more noticeable. During
operation, I
don't believe I have ever heard them get beyond FAN2, and that only
in data
modes with relatively long transmissions. In CW, the speed has never
gotten
above FAN1, even while running stations in a contest.
Ambient temperature may have a lot to do with it, though. The fan
speed
depends on PA temp, and if the ambient temperature starts out high,
it takes
less heating to reach the next set point. The temperature in my
shack right
now is a balmy 15C (that's just about 60F), so my K3 has to work
pretty hard
just to get up to the FAN1 set point. In summer, when even with A/C
running
it is about 10 degrees C warmer in here, I expect the fans will be
more
noticeable.
73,
Rich VE3KI
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