Re: K3 reduced or no TX output on low and high bands
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I had a similar problem.
Locate the 3 Driver Fets that use the bottom cover as a Heat Sink (see Assembly Manual).
I would do this test on 80 Meters. In the SSB or AM mode Key the PTT or TX and FEEL
The bottom cover to see if the Driver FETS Gets HOT. If Hot they are most likely shorted.
I think I found this test on U-TUBE. If none of the Driver Fets gets Hot, then I would look
At the Output FETS. If you are Comfortable Working on the Radio, you can take the bottom
Cover off and remove the FETs from the board and test them with a Multi-meter.
Hope that helps…….. Ray WA6VAB.
From: Jarmo Blomster
Sent: Thursday, April 16, 2020 6:59 AM
Subject: [Elecraft-K3] K3 reduced or no TX output on low and high bands
I sent this to K3 support, while waiting their answer I ask here also.
Last week I noticed that my K3 has no TX output on 6m band.
Transmitter Gain adjustment
6m, 0.1W, --, 14.8V, 2.19A.