[Elecraft] FW: Sudden K3 problem: PROBLEM SOLVED

[James Beitchman]

The problem was excess current to the PA and opening of the PA breaker on
the rear of the K3 while I was running about 75W carrier from the K3. Using
the K3 I was a was discovering with high SWR for several minutes, the
correct SWR 1:1 tuning points on a newly modified external manual antenna
coupler. Closing the breaker with the correct low SWR settings of the
antenna coupler permitted the rig to resume 100W operation.

 

73,

 

Buzz

W3EMD

 

From: James Beitchman <jbeitchman at jgbconsult.com> 
Sent: Wednesday, January 29, 2025 9:11 AM
To: 'Elecraft at mailman.qth.net' <Elecraft at mailman.qth.net>
Subject: Sudden K3 problem

 

While tuning the K3/100 (S/N 1551 plus upgrades) and antenna coupler
(external) with the SWR 1:1 and the output power at about 75W, suddenly
there was a click from the K3 and the error message displayed: ERR 12V, This
now occurs when the power is increased from zero to about 10W.  At that
point, the problem occurs, and the power cannot be increased above 10W. The
power supply voltage is constant at 13.8VDC and does not glitch when the
error occurs. Thoughts?  Would appreciate help.

 

73,

 

Buzz

W3EMD



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