[Elecraft] K2 frequency runaway

[John Buck]

I posted to this thread once already, but believe that the friction 
issue is being under-rated.

The symptoms being described correspond exactly with the problems I was 
having when I has a too light or no friction setup on the knob.

Because the knob is slightly unbalanced, it will depend on the exact 
setting of the knob position.  It can be highly intermittent or start 
all by itself even without vibration.  It shows up because the shaft 
friction is actually very low.  This is good.

So if you have this problem, and are using very light friction, set in 
some more friction and see if the problem disappears.

I did not believe this was the cause until I tried it.  You cannot see 
the knob moving unless the lighting is right and you look very carefully.

My knob still has very light friction but not zero.  And I have not had 
the problem since.

Aloha,
John KH7T