[Elecraft] KX1 Crystal Filter Center Frequency a Little Low

[Roger Marrotte]

I just finished building KX1 #1447.  All went well with the construction.
All seems to be working fine.  This is the second KX1 I've built.  I've also
built three K2s and a K1, all with most options.  I recently built another
company's QRP rig and that was a chore, to say the least, compared with
building the Elecraft rigs.  The center frequency for the crystal filter on
the new KX1 seems to be around 490Hz according to Spectrogram.  Peaking
signals with the filter set to it's narrowest setting shows a center
frequency of about 490Hz with Spectrogram.  I built my first KX1 when they
first came out and I have since sold it and I don't remember what the center
frequency was for that one.  Is this low? Is this normal? Should it be
closer to 600Hz?  Can it be adjusted up closer to 600Hz?  All else works
fine with the radio.  The filter is nice and sharp.  Signals are strong on
both bands.  The rig only has 20 and 40 meters so far.  I did the BFO and
DDS procedures.  Signals seem to be coming in at the right frequencies.
 
Roger, W1EM