[Elecraft] Strange loss of output...

Tue May 20 11:11:00 2003

Ron
On 20m, what does the PA current look like at
5w and 10w requested power?
If something has changed in the PA LPF, that
could have an effect.
Also, since 30m seems ok, possibly a relay
involved with 20m has a bad contact.  I'm
sure others will offer other suggestions as
well.
Good luck and 73,
Bob N6WG

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Ron W
Sent: Monday, May 19, 2003 8:51 PM
To: Elecraft Reflector
Cc: Gary Surrency
Subject: [Elecraft] Strange loss of output...

Hi all,
         I wonder if anyone can suggest what might be wrong here.....here is
the scenario:
For a while now the power out on 20m has been low. Today I can max about 35
watts, so I took the long suffering K2 apart and went through the transmit
alignment again, put it all together. No change.
I then removed the KPA100 completely, powered the set from the old "QRP"
jack and looked again.
I can set the L8 and L9 for max power output on both 20 and 30m as
described. No problem there. I then peak C21 and C 23 for max power . Once
again no problem.
I can up the power to 5 watts and all bands show the same output on the watt
meter.
I set the power level to 10 watts and all bands show 10 watts (near enough)
*EXCEPT* for 20m which still shows 5 watts.  I just can't get 20m to give
any output above 5 watts.
I guess a problem like this reeks of dud soldering on a toroid (?) , but if
30m ,( which shares the LP and BP filters) is fine , then where?
Having posted this I will go over the connections of the BP and LP filters,
....and that means taking off that gosh-awful heatsink panel

Any ideas appreciated in the meantime.
Cheers......Ron ZL1TW

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