[Elecraft] K2 PLL reference oscillator

[Don Wilhelm]

Scott,

Perhaps the statement in the manual is a bit terse for the full meaning.
If the external counter and the internal counter read the same, then 
there is no problem with the K2 internal counter.
With a frequency display significantly lower than 12090 kHz when the 
(known good) counter probe is placed in TP3, then you certainly do have 
a problem with the PLL reference oscillator.

Take a look at the schematic for RF Board sheet 1, and you will see the 
components associated with the PLL Reference Oscillator in the upper 
left corner.  Check all those components for proper soldering, and check 
all the diodes for correct orientation (the Parts Placement diagram is 
handy for that).  If that does not correct it, check all the components 
for correct values.
The most likely problem is soldering, followed closely by a misplaced 
component.

73,
Don W3FPR

Scott McDowell wrote:
> Hi
> In doing the Pll reference oscillator test on my k2 the frequency reading
> should be
> 12090 +/- 30 khz according to the manual.
> I am getting a reading of 2099.67, and an external frequency counter shows
> the same.
> The manual seems to say that as long as both the internal counter and the
> external counter
> have the same reading it is ok. Am I reading in something that isn't here?
> It seems to me the two readings are a long way apart.
> any info appreciated
> Scott N5SM
>
>