[Elecraft] Power spike early K3

[Brian Hunt]

I had a similar problem and traced it to voltage sag under load at the K3. The power supply was good under load but there was too much loss in the stock cable which was wired directly to the PS. I replaced it with a heavier, shorter cable. I found that I had to run the TX gain calibration twice in a row to get it right. It’s been fine since. 

GL&73,
Brian, K0DTJ

> On May 20, 2023, at 00:50, Mikael Larsmark <mike at sj2w.se> wrote:
> 
> Hi,
> 
> We have an early serial K3 which has got an issue with power spikes. I have
> done a TX gain calibration without it making a difference. The spike
> happens mainly when you have changed to a new band and during the first
> transmission. After that the spike is a lot smaller and not much of an
> issue.
> 
> Anybody have any ideas of what this could be because of? It kind of makes
> it impossible to run a solid state amplifier on the radio and probably not
> good for the tube amplifiers either.
> 
> /Mike, SJ2W
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