Re: [Elecraft] K2: Spectrogram and BFO/filter calibration

[Don Wilhelm]

  John,

For the OP1 filter, drop the high frequency marker to 2600 Hz and center 
between the 2 markers.
Remember that what is important is for the low frequency corner (-3 dB 
point) of the passband be placed quite near 300 Hz.  That is also 
important for the more narrow SSB filters as well.

For CW, you are doing it correctly - EXCEPT - if you try to center a 
wide filter (say the FL1 filter is either the default 1.50 or 1.20 
width), centering it will cause a response on the opposite sideband.  
Move that filter higher so you can see a drop down to the noise level on 
the low frequency slope - that will likely place the low frequency 
corner at about 200 Hz.

Refer to the K2 Dial Calibration article on my website www.w3fpr.com for 
more information.

73,
Don W3FPR

On 10/10/2010 11:01 PM, zen...@netspace.net.au wrote:
 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.

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RE: [Elecraft] K2 + spectrogram

[Don Wilhelm]

Dohn,

Download version 5.17 (the last freeware version),
Use the instructions on Tom Hammond's website www.n0ss.net or the links on
the Elecraft site and they will match.

I hope you did not pay for that version 14.1 yet - it is much more than you
need for setting the K2 filters.
Of course if you have other uses for the bells and whistles, that is great,
but you will have to dig the 'how to use' info out of the Spectrogram help
files.  Most of us have not used the updated versions of Spectrogram, so we
can't help a lot there.

Don W3FPR

 -Original Message-

 I was planning on using spectrogram to align my filters.  I have it loaded
 and I'm looking at it.  What I see as preferences in the program doesn't
 match the most updated Elecraft link on using the program for
 this purpose.
 It is version 14.1.  Any suggestions?



 Dohn N8EWY


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