Re: RE: 2. Re: K2 SSB TX Alignment Tools Proposal

Posted by David Woolley (E.L) on Oct 07, 2007; 5:01pm
URL: http://elecraft.85.s1.nabble.com/RE-2-Re-K2-SSB-TX-Alignment-Tools-Proposal-tp454315p454317.html

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
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com