[Elecraft] FREQ. AND WWV ???

[Masleid, Michael A.]

Hi James,

First things first:  Do what Don says.

Now, on to your questions:

>a station on let's say 3936.00 sounds
>about the same as that station on 3935.98 on the K2.)

OK, you are about 20 Hz off at 4 MHz, or 5 parts per million.

>what sounded correct was...approx.  9999.32 Usb
>and 10000.53 Lsb on the K2

So, (10000.53+9999.32)/2 =3D 9999.925, so your off by 75 Hz at 10 MHz,
or about 7.5 parts per million.

>(if I tune to 10000.00 Cw mode and use my spot
>func. 9999.91 sounds about zero beat.)

And this is off by 90 Hz, or about 15 Hz from the USB/LSB measure.
Chalk some of this up to D/A converter resolution setting BFO frequency. =


>K2 reading 21.120.00 C
>zero beating the signal on the 990 reads 21.120.13

So you are off by 130 Hz at 21 MHz, or about 6 parts per million.

OK, 5 ppm, 7.5 ppm, 6 pmm, lets call it 6 ppm average.

>I guess my question is this:  Is the freq. (c22) off by 130 hz  ???  if =
so,
>why does it only seem to be 20 hz on sideband??

Well, all of the calibration is based on what C22 was doing back when =
you
calibrated the K2, so it is fair to say the C22 was set wrong by
6 parts per million.  Since C22 should be set for about 4 MHz, it was =
wrong
by 6x4 or 24 Hz too high.  - Which is about what you saw on 80 meters (4 =
MHz).

If C22 was set wrong when you calibrated, the amount of error goes up at =
the
higher frequencies.

I'm not saying that C22 was set for 4,000,024 though, just set 24 Hz too =
high.
From what I've seen, dial calibration comes out on the low side if you =
set C22
to exactly 4 MHz.  Try about 13.3 Hz less than 4 MHz, or use Wayne's =
method, or
one of the other ones on Don's web pages.

There's a lot of thing that come together to make the K2 accurate.  It =
is a
learning experience!

73 de Michael, AB9GV