[Elecraft] K2 PLL reference Oscillator range overly large

[John, KI6WX]

Fletch;
The upper value is exactly what I would expect with the temperature
stabilized version.  The lower frequency is a little lower than what I saw
when I designed this change, but should be okay.  The lowest the PLL
Reference tunes in operation is 10 kHz below the PLL Reference high
frequency.  You probably have a varactor diode that has more capacitance at
zero voltage; this will not effect the normal operation of the K2 since we
don't operate the varactor near zero volts.  Go ahead and finish your K2; I
don't expect that this will present any problem.
-John
 KI6WX

----- Original Message ----- 
From: "F. Veitch" <FletchV3@comcast.net>


> I realize that the range upper limit has been expanded several times, but
I
> am seeing well in excess of what has been currently posted as being
> acceptable.  Currently I am reading
> 12100.48 kHz for the Ref. High Frequency
> 12082.70 kHz for the Ref. Low Frequency
> for a delta of 17.78 kHz.
> Is this too great a spread?  Any ideas as to why it is so large or what
can
> be done to bring it back in range?  This is a K2 with the temp compensated
> PLL upgrade.
>
> I have several other problems at this point,(strange spot behavior among
> others) but want to take them one at a time.  Receiver seems to work well
> and both 4 MHz oscillator and VCO alignment went just fine.  BFO Alignment
> and VFO Linearization went fine. Any comments will be greatly appreciated.
>
> Regards
> Fletch
> K3JYD