This happens due to heating of the finals (network); typically 1500
watts when cold (15-25C in my shack), drops to 1400 watts once warmed up
(50-60C). One can either adjust as needed or just accept 1500 cold and
the drop (much less than one dB); but of course one should pay attention
in all cases, should the limit exceed the permitted levels.
True gain values should include the temp of the amp; it matters.
90% of the time, when I use the amp, I'll run <1200 watts out, even
though there is already plenty of headroom in the amp. It's rare that
the few hundred more watts makes any real difference (but it's nice to
have!).
Now that winter is starting (North Idaho), it also takes the chill off
the shack!
73,
Rick NK7I
On 10/31/2020 10:34 AM, K8TE wrote:
I have also noted that after not using the KPA1500 for a "long time" which
could be 15-30 minutes, power output can exceed alarm settings (well over
1500 Watts). And when used some more, the power output decreases to 1500
without any exciter adjustments. This means the KPA1500 gain figure seems
to increase after "resting" and decreases with use.
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