[Elecraft] PLL Problems

[Don Wilhelm]

Mike,

Your internal counter operation seems to be marginal.

There was a time (and as I recall it was near the serial number you 
have) when the transistors Q9 and Q10 on the control board were weak.  
Take a look at those transistors - if they have a blue surface on them, 
replace them as first recourse.  You can use 2N2222 (or PN2222) 
transistors in this application, or order the proper 2N5179s from 
Elecraft.  Even if they are black in color, you should still replace 
them just to see if that fixes the problem.  If you need to just try the 
2N2222s, there are two that you have not yet installed, being reserved 
for the transmit section of the RF Board - you can 'borrow' those until 
you obtain replacements.

As partial explanation - the signal from TP2 does not have as much 
amplitude as the signal at TP1, so it is quite feasible for the 
probe/counter to work at TP1, but fail at TP2.

73,
Don W3FPR

Michael Steel wrote:
> I am having problems with my K2 kit: S/N 030xx (bought used unassembled).
>
> I am in alignment Test II portion of assembly, and I am having the following problems:
>
> My PLL is reading a frequency between 04255-04265 (jumping fastly between them as well) at TP3.
>
> At other points (including U4 pin 1) it is reading 12010.52 and is very steady.  
>
> I have double checked all the components that were installed, but I had no luck there.  Does anyone have any advice on what might be wrong, or at least what area of components might be causing this?  
>
> Thanks in advance!
>
> Mike, N8VDM
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