[Elecraft] Haunted K2

[Ron D'Eau Claire]

It sounds as if you fixed the problem by tightening the knob, but that isn't
the only reason for "hands off" frequency changes. 

There was an encoder issue in older K2's that can cause that sort of thing
to happen intermittently too. The frequency would increment on its own
because the firmware was mistakenly reading changes in the encoder output
during transmit as actual knob movement. The result was a steadily changing
frequency with both hands off! 

That was solved with a simple wiring change documented here several years
ago and subsequently fixed in firmware. If you have 2.02E firmware or later
you have the fix. 

Ron AC7AC