[Elecraft] [K1] Unusual ATU Problem

[Mike Morrow]

Don wrote:

>One thing to check is the seating of the microprocessor in its socket.  
>... A loose connection to one of the microprocessor will create
>many 'strange happenings'.

Steve's problem is a strange one.  Something is reseting the MPU PIC.
I'd almost suspect a problem around the 80/30m KFL2 filter board PIC.
On the K1 it is the filter board controller and also the I/O
controller for the attenuator relay and the AGC on/off state.
I don't know if it's possible for the KFL2 PIC to cause a MPU reset
by doing something nasty to the 6A power or 6R/AUX auxbus connections,
or why things would act up on only on 30m, but I think that the KFL2
PIC and associated connections deserve close scrutiny.  Maybe RF
coupling from the KAT1 is adversely affecting the PIC of the KFL2 just
below it more on 30m due to some poor connection on the KFL2...
...well, probably not.

Mike / KK5F