[Elecraft] [K1] Tuning Jump Cause

[Mike Morrow]

> The "jump" happens at several particular frequencies on all
> bands.  For example, 7055, 7130; 14055, 14130. Manipulating
> connections inside the case from the port to the board has no
> effect. Jaring the rig has no effect.  The "jump" seems to
> only happen while tuning down the band.  Pushing and pulling
> the tuning knob sometimes causes a "jump".  I'm leaning
> toward replacing the Bourne pot, maybe the wiper has
> developed a problem.

If the pot has the problem at specific positions of the wiper
then the frequencies shown on each band for the troublesome
position should vary for each band by the amount that each
band varies as shown at the full CCW position.  For example,
My K1 displays 98.1 on 40m and 92.1 on 20m.  If my pot
shows a problem at 7040, I should see that also at 14034.
This variance occurs from the heterodyne crystals not being
exactly on their nominal frequency.

But I tend to agree that it looks like the pot is suspect
based on all you report.  Early pot failures have been
reported especially after an impact that pushes the knob
into the panel.  Sometimes even the back of the pot has
separated.

> Is there potential for any rebate from Bourne?

It's good that you've retained your sense of humor!

73,
Mike / KK5F