[time-nuts] True to there word. - Fancy WWVB

J. Forster jfor at quik.com
Tue Feb 9 01:28:08 UTC 2010


If you track for a day, and draw a straight line throught the diurnal
shift, you can easily see a frequency drift of 45 degrees. That's 1/8
cycle of 60 KHz or about 2 uS. So 2x 10 E-6 out of 10 E5, so you can see 2
x 10 E-11 in a day.

ASSUMING the lock does not break.

-John

===================



> Hi
>
> People rarely want to use WWVB mobile. The location of the transmitter and
> receiver can be looked up on a map. The time of sunrise at both locations
> should be something that could be calculated.
>
> Assuming you are willing to put up with all of that, you should be able to
> do a first order correction on the shifts. The question obviously is -
> just how good would the net result be? Is it a 5:1 sort of thing or do you
> get a couple of orders of magnitude?
>
> Bob
>
> On Feb 8, 2010, at 6:40 PM, J. Forster wrote:
>
>> Yes, but WWVB is a PITA to use (because of the diurnal shifts) compared
>> to
>> LORAN.
>>
>> -John
>>
>> ===============
>>
>>
>>> Hi
>>>
>>> WWVB is pretty safe. When they do a cost/benefit thing on these
>>> services,
>>> they take a look at how many taxpayers are using the service as
>>> intended.
>>> The "mission" of WWWVB is to put out time signals. There are a *lot* of
>>> taxpayers with WWVB "atomic clocks" on their walls.
>>>
>>> Bob
>>>
>>> -----Original Message-----
>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>>> Behalf Of Don Henderickx
>>> Sent: Monday, February 08, 2010 4:07 PM
>>> To: Discussion of precise time and frequency measurement
>>> Subject: [time-nuts] True to there word.
>>>
>>> The lights went out (actually red) on my Austron 2100 r this morning.
>>> (whats  next WWVB ?)
>>> Don H
>>>
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>>
>>
>>
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>
>
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