[Elecraft] K3 strange overshoot

[Mike Cizek WØVTT]

Ahoj Petr,

I have a similar problem with my K3s.  Drive power for the amp is 20 to 25w and the power spike is always around 70w.  Elecraft had the radio for three months and claimed they could not reproduce the fault. I discovered later that it only occured when I was in CW QRQ mode and that I could “force” the fault by either exiting QRQ mode or changing to a narrower filter.  I sent that info to Elecraft, but they never replied.  This happens on all bands except 6m.

Thinking it might be a firmware issue, I tried loading an older FW version but have not been able to convince K3 Utility to do that.

73,
Mike Cizek WØVTT

> On Feb 11, 2022, at 9:45 AM, Petr Ourednik <indians at xsmail.com> wrote:
> 
> Hi folks,
> 
> so sorry to bother you over here.
> I realized strange behavior of my trusty K3 (#778 fully upgraded, loaded, latest synths installed)
> When I tried to exciting KPA500 amp I suffered with strange overshoots during first dots.
> 
> Symptoms:
> - up to 12W from K3 all is ok, over 13W the full scale deflection on KPA500 appears on first dots
> - after 1-2 dots power drops back to expected power based on exciting power level
> - the overshoot appears again after band changing or switching between OPER/STBY
> - 160m-30m are heavily affected, 20m-10m behaves better and it can be driven up to 18W but overshoot appears too (just slightly to about 600W on LED scale)
> 
> Conditions:
> I realized that behavior into antennas with SWR all below 1:1.4 > no SWR protection activated at all.
> The same issue appears into dummy load.
> 
> I will be happy for any kind of ideas or hints where to start...:(
> Many thanks in advance.
> 
> 73 - Petr, OK1RP
> "Apple & Elecraft freak"
> B:http://ok1rp.blogspot.com
> --
> What could be easier..?  ¯‍∖‍_‍(‍ツ‍)‍_‍/‍¯
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