[Elecraft] K2: Spectrogram and BFO/filter calibration

[zendoc at netspace.net.au]

Hi Group,

K2 #6998 is alive and listening on 40m.

I'm no expert in all this, so I have a basic question about using Spectrogram 
for BFO alignment.

I've been using Spectrogram to align BFOs/filters for CW and SSB, having read 
some tutorials about how to do this.  On CW, I'm adjusting the BFO settings so 
that my sidetone frequency lies in the centre of the bandpass of each filter.  
For SSB, I'm adjusting the BFO settings so that the bandpass of the filter 
lies centred between the upper and lower frequency cut-off marker lines for 
the filter:  for example- for a 2.4khz filter width, centering the bandpass 
between 300 and 2700hz.  I hope that understanding is correct.

Now, my question is this:  how is the "bandpass" defined, visually, using the 
Spectrogram trace on my screen?  Is it enough to get the trace symmetrically 
oriented around the sidetone frequency (CW) or between the upper and lower 
frequency markers (SSB). Or are there other points of significance on the 
visual trace that I need to use to ensure correct placement of the BFO offsets.
Also, what degree of precision is required?  Do I need to get obsessional 
about this and measure the width of the bandpass , however defined, precisely 
and then adjust the filter response around the markers using actual 
measurements.  Or is "eyeballing" all that's required here?? I'm not sure how 
type A I need to be.

Thanks for your advice.  I also have a question about the AGC, but I'll leave 
that for another time...

73,
John
VK7JB




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