[Elecraft] Use Spectrograph to check calibration

[Allen Ward]

I have been working on my K2 over the past two weeks after some (self
generated) problems with the KDSP2.  The dial calibration was off by 200 Hz
and ssb didn't sound quite right and the DSP artifacts were too much for my
ears.   Once I had everything as it should be circuitwise I reset C22, did
the PPL and FIL cals and checked operation.  I was using Spectrograph and
listening to WWV.  The thought occurred that I could check everything by
looking at the signals from WWV.
There is either a 500 or 600 Hz tone and a 1000 Hz tone at the minute
intervals (see http://www.boulder.nist.gov/timefreq/stations/iform.html
for complete information).
 Set the K2 dial to 10000.00 on 10 MHz band set the Spectrograph pointers to
500 and 600 HZ.   If the K2's calibration is correct the tone signals will
occurr at the markers.  Change between USB and LSB.  If the filters (BFO
frequencies) are correct the tones will not shift.  Check all filters.
Reset the upper pointer to 1000 Hz and the minute tone should peak there.
When I had finished and everything was right on the DSP noise reduction
artifacts were greatly lessened and speech was much closer to normal.  I
don't recall seeing this written up before so maybe it will help some folks.
It is a pleasure to have old #1107 back in tip top shape.
73 Allen KA5N