K2 goes wild on 40m - - need advice

[vidi]

Elecrafters,

I bought a K2 already built up from a friend  while on a trip to the USA.  It is serial number 1008.  It is stable on all bands except on 40m where it breaks into oscillation as soon as I start sending CW, even with the power output set to a very low level.  
I  would appreciate  advice from any K2 owner  who has experience of this problem and could help me rectify it.

73
Vidi - ZS1EL
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[Don Wilhelm-4]

Vidi,

If it is the 100 watt K2, I strongly recommend adding the KPA100UPKIT -
that change was made because some KPA100s tended to develop a parasitic
on 40 meters.  You should also install the upgraded shield kit.

If you have the 10 watt K2, then there is another problem and we need
more details.  The basic K2 is normally quite stable, and I have never
know one to have a parasitic.

Can you find the frequency of the parasitic oscillation?


73,
Don W3FPR

vidi wrote:
> Elecrafters,
>
> I bought a K2 already built up from a friend  while on a trip to the USA.  It is serial number 1008.  It is stable on all bands except on 40m where it breaks into oscillation as soon as I start sending CW, even with the power output set to a very low level.  
> I  would appreciate  advice from any K2 owner  who has experience of this problem and could help me rectify it.
>
> 73
>
>  
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