[Elecraft] K2/100 output variation

[Don]

I (and many others) have exactly the same power variation.  I just recently 
changed R99 to 1.1K and that reduced the variation in power to the point 
that I no longer notice the variations.  A check of maximum power output 
shows that I still get normal performance on all bands.

Don K7FJ

> No, that didn't help, Stewart. With the 100 PA disconnected and 5 watts 
> requested, I see around 0.5 w difference in actual power and that is 
> stable.
>
> Having re-connected the 100 w pa to restore the K2/100 to the state I 
> would normally use it, I have put a scope on the output. With requested 
> power of 50w, in Tune the readout shows 29w immediately, dropping to 24, 
> 21 and 17w, it then toggles between 17 and 22w. I can see this stepping on 
> the waveform displayed  on my scope. It also explains what I was seeing 
> the other night. Since I was working pile-up style, the overs would be 
> short, so each time I went to transmit the power variation in the K2 would 
> also vary drive to the amp with the consequent output variation of between 
> 100 and 200 w from the amp.
>
> Chris G3SJJ
>
>
>
> Stewart Baker wrote:
>> Chris,
>> Take a look here... http://www.elecraft.com/Apps/Power_Control_Mod.html
>>
>> 73
>> Stewart G3RXQ
>>
>> On Wed, 27 Dec 2006 14:07:24 +0000, G3SJJ wrote:
>>
>>> I am sure I have seen a discussion about this one before. During an
>>>
>>> enjoyable 160m opening to the Right Coast just before Christmas I was
>>> running a few Stateside stations and noticed a definite output power
>>> variation coming from my Acom 1000 which was being driven by the K2. I
>>> would guess that the drive power was varying between 30 and 50 watts.
>>> Any thoughts on this?
>>>
>>> K2/100 5545 bought at Dayton this year, completed in September.
>>>
>>> Chris G3SJJ
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>>
>>
>>
>>
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