[Elecraft] Re: K2 #3725 yet again - warble

[Masleid, Michael A.]

Hi Ken,

>Even with the tuning rate set at 10 Hz, the transition point chirp was=20
>evident.

Seems to me the PLL circuit time constants are too long.  This may be
due to a resistor or capacitor value that is wrong (too large), or =
perhaps
a high resistance connection.  Look at C100 and R19.  These controls how
fast the reference oscillator makes little and big steps.  The phase =
lock
loop filter is more complicated.  Look at R30 and C96 first.  Then check
R24, R25 and C92, Then check R28, C94 and C95.

Those time constants are in the microsecond range.  If something got =
them
into the millisecond range, it would end up as chirp.

Good luck - Michael, AB9GV