[time-nuts] Synchronizing to WWV

[jmfranke]

I agree.  I have several Z3801A units for GPS timing and a rubidium 
standard, but I still like to use a simple scope triggered from the 1PPS 
output of a test oscillator to monitor the ticks from CHU on 7.850 MHz.  I 
also use a circular sweep oscilloscope sweeping at 100 Hz, derived from a 
Jupiter GPS receiver 10 kHz output, to view the ticks.  Having the machines 
and powerful computers is nice, but occasionally I like to see the signals 
as was done in the early years.  It was not that long ago!

John  WA4WDL

--------------------------------------------------
From: "Justin Pinnix" <justin at fuzzythinking.com>
Sent: Friday, December 18, 2009 11:40 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Subject: [time-nuts] Synchronizing to WWV

> Hi Nuts,
>
> Most of you have probably seen this before, but I ran across a great
> 1975-vintage paper on how to synchronize your clocks and frequency 
> standards
> to WWV's HF broadcasts.  The equipment needs are very basic - a clock, a
> radio, and an oscilloscope.  The procedure is simple and far more reliable
> than the tone-detection method I attempted earlier.
>
> NBS Technical Note 668 - The Use of National Bureau of Standards High
> Frequency Broadcasts for Time and Frequency Calibrations (
> http://tf.nist.gov/timefreq/general/pdf/453.pdf)
>
> Yes, I realize that GPS is literally a million times more accurate, but if
> all you need is milliseconds,  this will do the job cheaper than a GPSDO 
> or
> it could serve as a backup.  Plus it's a lot of fun to stare at the 
> traces.
> They are quite hypnotic.
>
> Thanks,
> -JP
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