[Elecraft] Re: New Crystals (K7JG)

[Ron D'Eau Claire]

The crystals are a matched set. Change one and you need to change them
all if you want good predictable performance. That includes both the CW
filter crystals on the r-f board and the OPT1 crystals on the SSB board.
Otherwise you will more likely end up with more problems than you
started with. 

What do you mean that "calibration settings are by the book"?. Do you
mean the BFO frequency settings are those suggested in the manual? If
so, then your problem is a mis-aligned filter, not necessarily a bad
crystal. On the narrower bandwidths especially, the "book" values are
likely to be well off the mark. Use Spectrogram and align those filters
and see how it sounds. 

SOME ops report an  improvement in the audio level after changing the
rocks. SOME others report better SSB bandwidth out of the OPT1 filter
with new crystals. Your symptoms sound like the BFO isn't on frequency
for FL3 and FL4.

Ron AC7AC
K2 # 1289

John, K7JG
... 14 new crystals are in hand but now what. SSB audio volume is okay
on OP1 and OP2; the big drop in audio occurs on FL3 and FL4.  This
weekend it was sufficient to pickup a LU and LO, T32, ZD8, ZK1 with AF1
on and OP1 or OP2. So if it isn't broke I don't want to break it fixing
it. Calibration settings are according to the book. ... it looks like X7
- X11 might be the culprits. So changing those 4 out should do it,
right?