[Elecraft] K2 PLL reference oscillator test failure

[Don Wilhelm]

Harlan,
The most common causes for a frequency counter display changing rapidly is
(in order of probalility) 1.)  Insufficient signal, 2.) High noise level
along with the desired signal, and 3.) Overloading the counter front end.

If you have access to a 'scope, take a look at the input signal and you
should be able to determine quickly which of the above conditions exist (if
any).  Compare the point you are trying to measure with the one giving a
good reading.

73,
Don W3FPR

----- Original Message -----
> Hi gang!
>
> With serial #3398, I'm getting the "changing rapidly" syndrome
> when I perform the "4 MHz Oscillator Calibration" step on pg 57
> of the K2 manual (Rev E, 02/16/03).
>
> I confirmed that the frequency counter probe itself is working by
> repeating the test from page 45 (the F.Counter showed ~3999.)
>
> I also confirmed that I have the correct IC in U4 and the solder
> connections look fine under magnification.
>
>