[Lowfer] Request for your frequency readout on my signal

[Neil Klagge]

Andy, I just barely had ur signal in the window. It was higher in freq than
I expected. It is a good thing that I had Argo in qrss30 mode or I would
have missed your freq completely.

Neil

w0yse, Layton Utah


On Tue, Oct 8, 2013 at 11:53 PM, JD <listread at lwca.org> wrote:

> With 800 Hz audio representing 1838.230 kHz after scale correction, I read
> your frequency to be between the nominal value and 1 Hz below at any given
> moment during the time I watched.  That's at the bottom part of the
> picture. It does make it very rough on QRSS30, unfortunately. The secret of
> Argo's success is in its matched filter properties, which only help if the
> signal stays within the right number of FFT bins for the right amount of
> time.  It may work under other conditions, but Argo can't do its miracles
> as well (see my capture of XRS4 in a few minutes for more about this).
>
> There was one "4" that was pretty stable, so I also did a practice run on
> it at QRSS10, to provide a simplified demonstration of the after-the-fact
> calibration technique.  Every month or so I check the sound card against
> WWV tones, of course, but there's seldom any correction needed there.  The
> daily--even hourly--concern is the radio.  Since all frequencies in the
> radio track the master oscillator, a check of WWV at 10 MHz makes it easy
> to find out how many parts per million I'm high or low.  Right after the
> "4" WWV was showing 29.1 Hz high, or 2.91 ppm.   That times 1.83823 MHz
> gave 5.35 Hz as the receiver error for this signal at that particular time.
> Rather than play with Argo in the dark and mess everything up royally, I
> shift the scale graphically later.
>
> Hope that helps, Andy.
>
> John
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