[time-nuts] Synchronizing to WWV

[Justin Pinnix]

Hi Don,

I think the Heathkit clock was more sophisticated.  It read the 100hz data
code and automatically set the hour, minute, seconds, and date.  It did all
of this using an on-board microprocessor.  I've never owned one, so I'm
basing my information on the blurb here:
http://wd6cmu.antennalaunchers.com/gpsclock.htm

The NBS 668 method is a more manual process.  First, you set your clock to
within a second by listening to the "at the tone" message and pushing the
button when you hear the beep.  Then, you make small +/- phase adjustments
it until the 1Khz "tick" pulse appears where you expect it to be on the
scope.

Thanks,
-JP
On Sat, Dec 19, 2009 at 2:01 AM, Don Latham <djl at montana.com> wrote:

> Is this the basis document for the Heathkit Most Accurate Clock???
> Don
>
> ----- Original Message ----- From: "Justin Pinnix" <
> justin at fuzzythinking.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts at febo.com>
> Sent: Friday, December 18, 2009 9:40 PM
> 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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