[Elecraft] RE: K2 Frequency Alignment

[Ron D'Eau Claire]

I did not write up the 10 MHz procedure because in further testing =
several
ops found that there are a number of signals produced by the logic very
close to 10MHz. It's a matter of luck to hit the right one. It's very =
easy
to get a "wrong" signal and carefully calibrate the system for a 50 Hz =
or
greater error <G>.

There may be a way of getting to the "right" signal at some point in the
logic, but I haven't had the time to pursue it. Simply "sniffing" the RF
around the 4 MHz xtal isn't reliable since we have to pick up a 10 MHz
signal that is an artifact of the counting process in the logic instead =
of a
harmonic of the 4 MHz oscillator.=20

Zero beating the 4 MHz oscillator to WWV at 20 MHz works very well, but =
WWV
has been virtually non-existent in N.W. Oregon for several months, so I
haven't finished that one. And it looks like it has limited use unless
propagation improves <G>. I had promised that to Tom, N0SS, to put on =
his
web site, but wanted to test it again myself first.=20

Ron AC7AC
K2 # 1289


-----Original Message-----
All,

I just ran through this procedure using WWV at 10MHz.  I remember being =
one
of the testers of this method and have it work excellent when I tested =
it
back in February.  I even remember creating a slightly more formal =
write-up
and sending it to Ron but alas I cannot find either the document or the
email at this time.

My results last night were similar to those I read earlier on this =
thread. I
got good zero beat but ended up with WWV being 40-60Hz off on 10MHz.

The next issue I have is that while I was working to get the 4MHz to =
zero
beat, I notices some drifting of the beat signal.  Warm-up was more than =
60
minutes and I do have all the temperature stabilization mod's in the =
rig.  I
also did not notice this while listening to WWV so I assume that my 4MHz =
has
some instability in it.  I am not that good with the math here but my =
beat
not was changing by about +/- 1 Hz at a rate of about 1/2 Hz.  Although =
this
would not normally be a problem I wonder what issues this may cause =
during
the CAL PLL procedure?

Fran