[Elecraft] RE: 2. Re: K2 SSB TX Alignment Tools Proposal

[David Woolley]

Web Williams wrote:
> I may be oversimplifying the problem, but here's my experience
> in aligning my K2. I happened to remember reading some very

You seem to be describing aligning the 4MHz oscillator in receive mode, 
whereas I think the thread was about aligning the BFO to the filter in 
transmit mode.

Considering what you did describe, I'd also suggest it is somewhat 
simpler, provided you don't mind having the optimum calibration in CW 
mode, to transmit in CW on the reference rig and match the K2 audio to 
the inbuilt 600Hz (adjustable) reference audio frequency.  That 
frequency is divided down from the 4MHz, so should have an absolute 
frequency error that is about 7000th of the basic calibration error, and 
will go to zero as you adjust the calibration (whereas a PC is likely to 
be off by 10 to 200 ppm, although even that will be too small to worry).

If you want the optimum calibration on one particular SSB filter, and 
you trust the reference rig at least as much in CW as in SSB, you simply 
need to add (LSB) or subtract 600 Hz from the reference reference rig CW 
frequency to get the SSB carrier frequency corresponding to a 600 Hz 
tone. Given that the calibration will vary slightly between LSB and USB, 
even on the same filter, most people don't think it worth worrying about 
the difference between SSB and CW optimum calibration points.



-- 
David Woolley
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