[Elecraft] KPA500 - Full Power Keydown
mcduffie at ag0n.net
mcduffie at ag0n.net
Sat Apr 25 11:33:56 EDT 2015
On Sat, 25 Apr 2015 05:06:28 -0400, Michael Eberle wrote:
> I have run JT65 at full power without any problems, but I manually set
> the minimum fan speed to 6 during transmit.
That's a tad extreme. That's 45 second transmit and 75 second receive - more
than enough time to cool down even with fan set to NORM, and not reach speed 6
on its own. When I'm on FSK441 on 6 meters, I sometimes set it to 5 to help
keep it from going to the highest speed at the end of a cycle while running
500+W. That's 30 seconds transmit and 30 seconds receive. It tends to cool to
58-59 degrees before the next cycle. The overall swing is around 12-15 degrees
after 5-10 minutes. Sometimes, a QSO may take 45 minutes, even multiple hours
to complete a full exchange. It can also be as short as 3-5 minutes to get the
reports across and acknowledgements received.
I don't know what Elecraft's opinion is on this, and would be curious to know. I
tend to think that, since the temp is going to get up high anyway, I'd rather
not let it get too cool during the receive cycle. I'm not sure that letting the
temp cycle high and then real low is a good thing. Is it good to cycle wide, or
keep the width of the cycle a little narrower? Power fade with high temp is
also a factor.
Gary
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