Re: [Elecraft] kpa1500 new issue

[Bill Stravinsky via Elecraft]

 Well, I just spoke with Elecraft and it appears this problem was one they had 
run across in early engineering.  I sent them the config file which might have 
some indicatorsthey can look at and make some determinations.  But if it turns 
out to be what the engineer said it might, there might be a fix that is needed 
to cure this if the temp swing istoo much.
Film at eleven.
BillK3WJV

On Monday, May 21, 2018, 12:58:37 AM EDT, Bill Stravinsky via Elecraft 
 wrote:  
 
 In the last few days I have made about 21 Qso's with the new amp casually and 
about 75 Q's in a few contests over the weekend.  The first night I had a 
problem that seemedto disappear.  It only happened on 40mtrs.  I was xmitting 
and the power dropped like I went into stby but no indications on the front 
panel other than the power LED's showinga power drop.  I chalked it up to maybe 
not having things setup right as it hasn't happened again.
But tonite I was making some 40 mtr Q's and everything looked normal except the 
temp was jumping from 6 to 8 degrees low, meaning the temp was climbing 
normally then itwould fluctuate rapidly down about 6 degrees.  If I stopped 
xmitting the temp was stabile but xmitting it would jump down and back up 
quickly.  And now as I'm typing this postthe temp has gone down to normal but 
the same thing is now happening.  Every time I xmit the temp jumps down about 6 
degrees and fluctuates back and forth.
I checked on 20 mtrs and it doesn't happen there so either I've got some rf 
floating around on 40 or there is a problem in the amp.  I ran the power down 
and it happens all theway down to about 500 watts out but only fluctuates about 
4 degrees.  Just checked on 80 and its OK there.  So will look into this tmrw 
some more.
BillK3WJV
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[Elecraft] kpa1500 new issue

[Bill Stravinsky via Elecraft]

In the last few days I have made about 21 Qso's with the new amp casually and 
about 75 Q's in a few contests over the weekend.  The first night I had a 
problem that seemedto disappear.  It only happened on 40mtrs.  I was xmitting 
and the power dropped like I went into stby but no indications on the front 
panel other than the power LED's showinga power drop.  I chalked it up to maybe 
not having things setup right as it hasn't happened again.
But tonite I was making some 40 mtr Q's and everything looked normal except the 
temp was jumping from 6 to 8 degrees low, meaning the temp was climbing 
normally then itwould fluctuate rapidly down about 6 degrees.  If I stopped 
xmitting the temp was stabile but xmitting it would jump down and back up 
quickly.  And now as I'm typing this postthe temp has gone down to normal but 
the same thing is now happening.  Every time I xmit the temp jumps down about 6 
degrees and fluctuates back and forth.
I checked on 20 mtrs and it doesn't happen there so either I've got some rf 
floating around on 40 or there is a problem in the amp.  I ran the power down 
and it happens all theway down to about 500 watts out but only fluctuates about 
4 degrees.  Just checked on 80 and its OK there.  So will look into this tmrw 
some more.
BillK3WJV
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