[Elecraft] KX1 Crystal Filter Center Frequency a Little Low

[David Toepfer]

On the low end of the filter it drops down from around 600Hz over most of the
range to around 500Hz.  I am sure others can detail why.

David, K3ZTUE
.


--- Roger Marrotte <marrotte at comcast.net> wrote:

> 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
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