[Elecraft] K2 upgrade A to B

[Don Wilhelm]

John,


It is rare to change the BFO crystals as part of an A to B upgrade.

The BFO crystals should be usable, but the IF crystals should be 
replaced with new ones. The crystals were controlled for motional 
inductance starting at about SN 2560 and result in a much better 
filter.  Elecraft sells a set of 7 matched crystals.  If you also have 
the KSB2 option for this K2, order the set of 14 and discard the 
original  IF crystals.

73,
Don W3FPR


John wrote:
> I purchased a K2 kit that was bought in 1999 and have been upgrading 
> it to "B".  This kit was never built and the crystals are a different 
> frequency than the newer ones.
> Can I use the old crystals or will it suffer performance with the old 
> ones?
> The "B" version BFO calls for 4.9152 MHz and the ones in the "A" 
> version I have are 4.915. 
> The "B" version calls for 4.9136 crystals and the ones in the "A" 
> version I have are 4.915.
> Thanks.
> John.
>