[Elecraft] L31 vs PLL range

[Ron ZL1TW]

Hi all,
          I was very interested in John's (WI6WX) very clear explanation of 
why L31 had been changed in value, as I did the "Temperature Compensated 
PLL mod" and changed L31 from the original 10 uH to 12 uH. After doing the 
change I really wasn't very impressed with the improvement in temperature 
stability (if any) and I am sure I know why now.
When I built my K2 #2204 we were advised that a PLL range of 11.5 to 
25kHz  was good. I recorded 24.8kHz . So far so good.
Then along came the BFO mod and Temperature Compensated PLL mod, where we 
were advised the range "must be greater than 9kHz". Mine was miles above 
that so I assumed I was still OK.
Last night John's note comes along and suggests a range of 11 to 15 khz.
Hells Bells......I am miles too high!!
I then read up the latest K2 Construction Manual and it states a range of 
9.8 to 13 kHz .  A fourth set of figures, and they concur with John's.
At this stage I took the bottom off my K2 and replaced L31 back to the 10uH 
inductor. Measurements now show a PLL range of 10.64 kHz.   I then did a 
CAL PLL and left it at that.
I have to say that the quick test I have done so-far, the  temperature 
compensation appears to be much better, but I intend giving it "the works" 
when WWV comes in a bit better later this evening.
Just as a safeguard I queried Gary at Elecraft about my PLL range and he 
replied " a 9 - 15 kHz swing is OK"
So there we have it. I enclose this info FYI on the off chance someone else 
might have gone along with the same mods and had similar results?
Cheers.......Ron ZL1TW