[Elecraft] K3 Erratic SSB Power Output

[Brian Alsop]

I second the grounding strap problem.
Through heat cycling or whatever, the ground nut of the back of my K3 
became loose.  Had a series of weird problems with power.  Tightened it 
up and the problems went away.

There is also the possibility that the cable between your K3 and the amp 
is flaky.

73 de Brian/K3KO

On 7/21/2013 20:13, Tim Hague wrote:
> Jack, my K3 is stable, sounds to me that you might have a grounding problem or traces of feedback. Not an inherent problem with the K3
>
> Best regards, Tim Hague, M0AFJ
> Skype m0afj.Tim
> Sent on my iPad
>
>
> On 21 Jul 2013, at 20:12, JACK WHITE <g8dx at btinternet.com> wrote:
>
>> Hello K3 Reflector.
>>
>>
>> I have an issue with my new K3/100 #7482. On SSB the peak power output isn't stable. The SSB power output fluctuates about +/- 15% of where it is set, but occasionally spikes to much more. The issue is on all bands but seems worse on 12/10m. I have tested the rig connected straight to a 1kW Bird 50ohm load and have tried 2 different linear power supplies. The problem is present using the two tone test feature, microphone or direct PC audio fed into the rig.
>>
>>
>> The real problem is: I set up my Acom 1000 at the legal limit here (400w) and the power output is all over the place, sometimes 150w, then maybe 500w, then 300w, then all of a sudden the power can spike to 1kW+. I operate mostly CW. Things seem more stable on CW, but compared to my previous Jap rigs (FT1000MP, FT990, TS850) etc, the power output is very difficult to properly regulate. On my previous rigs, I'd set them up to drive the Acom to a certain power level and they'd run for hours rock solid without a peep.
>>
>>
>> I've had an e-mail exchange with a friendly Elecraft Guy which resulted in me redoing the TX Gain calibration, he said the numbers looked good, but the problem persists. I am curious to see if anybody else has this issue and knows of a fix? As it is, the rig isn't much use to me.
>>
>>
>>
>> Cheers
>>
>>
>>
>> Jack G8DX
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