[Elecraft] K2 Anomaly

[VR2BrettGraham]

Don:

>A switch from VFO A to VFO B is unrelated to any pot sitting at a
>switchpoint.

Yes, they are unrelated.  Same thread, different message mentioned
noisy pots.  I replied to both as they are both of interest here.

>You should be looking for some other cause of this 'flakiness' - something
>is causing the microprocessor to execute a routine that it should not - it
>could be coming from a glitch on the pushbutton matrix, a bad solder joint
>at the switch that is just now showing up, or even RF getting into the K2 -
>these are just a few things immeditaely off the top of my head.
>
>You might try loosening the microprocessor a bit and reseating it.  It is
>possible for slight corrosion to develop at the socket to IC pin pressure
>connection, and the wiping action created by re-seating the socketed chips
>can often make the problem disappear - it certainly will not hurt anything
>to re-seat the uP.

If it happens again I might be able to get a feel for something I do
before that might bring it on (like VFO knob spin, then stop & perhaps
in a moment or two the power display comes up on its own), but since
the rig is being polled for frequency info about every second I think this
might be another AuxBus timing thing.

I gave everything socketed a push last time the covers were off & reseat
the CPU next time I'm in there.

73, VR2BrettGraham

> > -----Original Message-----
> >
> > I now have the rig jumping from VFO A to VFO B, in addition to phantom
> > displays of power level (the latter more likely to happen shortly after
> > stopping spinning the VFO).
> >
> > These do _not_ necessarily happen during transmit, or during transition
> > from transmit to receive or vice versa, so unlikely to be RFI.
> >
> > The VFO A to VFO B switch happened twice this morning - both
> > times during period of receive & with no operator interaction
> > with the rig.
> >
> > 73, VR2BrettGraham