[Elecraft] BFO Test @ K2 upgrade to Rev B

[Don Wilhelm]

Dale,

I would wait until after attempting to set up the filter/BFO relationships
(with Spectrogram) before determining if it needs to be corrected - you are
close enough to go with it.

If you are using the 2,5 kHz SSB filter bandwidth though, go ahead and add
the padding now, you will need the extra margins when aligning that filter -
in fact, you may have to experiment with the C173 and C174 padding caps when
using this wide filter width anyway, it requires a wider BFO range than does
a narrower filter.

73,
Don W3FPR

----- Original Message -----
>
> Reference: Upgrading the Elecraft K2 to Revision B, rev D, Jan 4, 2003.
>
> The numbers (kHz) are:
> BFO High Freq measured: 4916.99 (Min 4916.3).  This is OK.
> BFO Low  Freq measured: 4913.15 (Max 4912.7).  This is out of range.
> Range Hi/Low calculation:  3.84.  This is well above the 3.6 minimum.
>
> Q.  Is the BFO low frequency close enough or must I add the padding
> capacitors to C173 and C174.
>