[Elecraft] Help... PLL Reference Osc. Range Test ...results way to wide.

[Don Wilhelm]

Jerry,

That IS way too wide.  I would check soldering first, then check soldering,
and finally check soldering.  Next, check component values (look at the
schematic to find the components associated with the PLL Reference
Oscillator (those things connected to Q19 or electrically near it).  Make
certain that D16 and D17 are the correct type.

If you get the swing to less than 17 (or even 18 kHz) you will be OK -
somewhere there is an authoritative note that the 15 kHz max was too tight,
but 53 kHz IS too much - do re-check it, I find it difficult to believe it
would be possible to pull the crystal that much.

Another thing to check is the gain of U6A - the voltage at pin 1 should be
very close to twice the voltage at pin 3.

73,
Don W3FPR

----- Original Message ----- 

> Things have gone perfectly until I did the PLL Reference Oscillator Range
> Test.  It is far too wide.  The Ref. High Frequency is 12088.8 Khz and the
Ref.
> Low Frequency is 12035.5.  Therefore, the difference is about 53 Khz and
it
> should be between 9.5 Khz and 15 Khz.  Elecraft said check RFC15... it is
fine.
>
> any thoughts?   thanks ahead of time....   Jerry  K8RA
>
>
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