[Elecraft] [K2} Xtal filter calibration numbers

[Geoffrey Mackenzie-Kennedy]

Brian,

No, I have never used this xtal reference number.

The envelope containing the containing the xtals that came with my K2/100 # 
3255 kit in 2003 was marked 7. My guess is that either Elecraft might have 
changed their procurement spec for the xtals from time to time, and the 
number was used to identify the xtals procured using a paticular version of 
the spec, OR more likely, if they did not change the procurement spec the 
xtals purchased were sorted into different groups of matched sets, and the 
number was used to identify the particular series resonant frequency of the 
matched set of xtals supplied in any one kit. But I am guessing.

The frequency spread of similar computer grade xtals can be quite large, to 
get 10 reasonably well matched xtals of this grade for use in a filter one 
usually has to buy at least 50.

73,
Geoff
GM4ESD


Brian Denley wrote on Thursday, August 19, 2010 at 4:34 AM:

> The K2 manual and the SSB option manual urge builders to save the xtal
> calibration numbers written on the envelops they came in with the 
> statement
> that those numbers will be useful later for filter calibration.  But I 
> don't
> see where these numbers ever get used.  Has anyone else actually used 
> those
> numbers?
> Brian