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

[Web Williams]

I may be oversimplifying the problem, but here's my experience
in aligning my K2. I happened to remember reading some very
old QST articles about a device used to get stations precisely on
the net control's frequency during net operations. It was a very
simple 1KHz tone generator. The NCS station was supposed
to send out a 1KHz tone, and net stations would listen on frequency
while at the same time, playing a 1KHz tone at their location. This
would allow stations to zero-beat the NCS station, thereby being
precisely on the NCS station's frequency. So- here's what I did.
I found a tone generation program (freeware) on the internet that
allows you to play a precise frequency tone on your PC. I played
that tone into the microphone my Yaesu FT-847 which I knew to
be right on frequency. The FT-847 was connected to a dummy
load, and set for relatively low power (5 watts). The signal was
strong enough at the other end of my house (where I built my K2)
so that I could both hear the tone in the speaker of my K2 and at
the same time hear the tone emanating from my PC speakers at the
other end of the house. All I had to do was set my K2 on the same
frequency, zero-beat the tones, and that put me precisely on frequency.
(As close as my FT-847 was from the factory, anyhow.) It doesn't get
any easier than that! 73, -Web (KR4WM)

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[David Woolley (E.L)]

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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