Mine seems to have fixed itself. Output was dropping from 1500 to about
1100 W when it warmed up, but I just operated an hour in the CWT, and it
never dropped below 1400. That was consistent with the tests I ran the
other day. I had just come up with theory that the power drop was
caused by something ELSE in the amp heating up, not just the heat sink
for the MOSFET's. That might have explained why the problem didn't show
up in my brief tests. Now I just don't know what's happening. More data
required.
73,
Scott K9MA
On 6/5/2018 23:24, Bill Johnson wrote:
Roy, I owned and will soon have Kpa1500. Yes power will drop if heat becomes
an issue and you will fault. The amp logs the condition when it faults.
Have a great day,
Bill J
________________________________
From: [email protected] <[email protected]> on behalf
of Roy Morris, Jr. via Elecraft <[email protected]>
Sent: Tuesday, June 5, 2018 2:36:52 PM
To: Elecraft Reflector
Subject: [Elecraft] KPA1500 Drive Power
Noone has responded to my previous inquiry about the KPA1500 power drop-off due
to heat. I would like to know if the KPA1500 power output actually drops off
due to heat build-up or because the SWR display was erroneously showing a power
drop before it was fixed. Thanks, Roy Morris W4WFB
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Scott K9MA
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