[time-nuts] Some examples of HF frequency smearing`
daun at yeagley.net
Tue Nov 16 14:27:26 EST 2004
I just sent John some JPG's of the spectrogram plots I did at about the same
time as John did (as he said, we were setting up and "practicing" for the ARRL
FMT on Wednesday evening).
I'm using a similar program on my machine that does in fact run in Windoze. It's
called "Spectrum Laboratory" by Wolfgang Buescher, and you can find it at:
It's not quite as nice for our purposes as what John is using, but I don't have
Linux on my laptop. :) The program is pretty nifty though and certainly worth
downloading and playing with it.
Daun Yeagley, N8ASB
daun at yeagley.net
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
Behalf Of Tom Van Baak
Sent: Tuesday, November 16, 2004 1:51 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Some examples of HF frequency smearing`
That's a nice set of plots. Very cool tool. Too bad there's
no Windows version. Or is there a x86 Windows-based
emulator for Linux executables that would help?
Did you see the dozen mystery signal examples in:
I believe the baudline tool would be fantastic for analyzing
short-term stability of oscillators.
John, your plots bring up an interesting issue. Calling it
a frequency shift over a half hour may be mathematically
correct but we know this is actually a received carrier
phase shift over the sampling time. A good analogy of
how a phase microstepper works.
----- Original Message -----
From: "John Ackermann N8UR" <jra at febo.com>
To: <time-nuts at febo.com>
Sent: Monday, November 15, 2004 18:15
Subject: [time-nuts] Some examples of HF frequency smearing`
> In preparation for the ARRL Frequency Measuring Test, yesterday Daun
> (N8ASB) and I set up our gear for a practice session. We were working
> just after sunset here in Dayton, but before sunset at the WWV site in
> I took some screenshots of the WWV carrier showing how much frequency
> variation took place due to propagation effects. There was almost a
> Hertz of frequency shift over a half hour or so period.
> I put the screenshots at http://www.febo.com/time-freq/hf/index.html.
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