[time-nuts] Some examples of HF frequency smearing`

Tom Van Baak tvb at leapsecond.com
Tue Nov 16 13:51:18 EST 2004


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:

http://www.baudline.com/mystery_signal/

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.

/tvb

----- 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 
> Boulder.
> 
> 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.
> 
> John
> 
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