>>>> It's a stopped clock that's right once a year...
>>>
[quoted text clipped - 11 lines]
>
> http://www.wired.com/science/discoveries/news/2007/12/time_hackers

Signature
William Black
I've seen things you people wouldn't believe.
Barbeques on fire by the chalets past the castle headland
I watched the gift shops glitter in the darkness off the Newborough gate
All these moments will be lost in time, like icecream on the beach
Time for tea.
>When reasonably cheap (for a given value of 'cheap') GPS clocks (accurate to
>10 to the -16) became available everyone threw their old cesium beam stuff
>in the bin. That's why you can pick them up for the scrap value these days,
>nobody uses them anymore.
Those so called GPS clocks are not clocks at all, they merely report
radio time signals. What does the GPS system use for a clock? Cesium
beam stuff, maybe?
Casady
Billzz - 25 Jan 2008 17:51 GMT
>>When reasonably cheap (for a given value of 'cheap') GPS clocks (accurate
>>to
[quoted text clipped - 7 lines]
>
> Casady
Here is a good answer, but don't ask me to explain it!...
http://www.gpsinformation.net/main/gpstime.htm
Andrew Swallow - 26 Jan 2008 01:21 GMT
>>> When reasonably cheap (for a given value of 'cheap') GPS clocks (accurate
>>> to
[quoted text clipped - 11 lines]
>
> http://www.gpsinformation.net/main/gpstime.htm
Redrafting the article.
For the last 27 years the Earth has been running a little slow (or
fast).
(Clocks are now more accurate than the Earth as time keepers.)
Greenwich Mean Time has been corrected to allow for this.
The US military forgot to include a way of adjusting the GPS clocks
to the correct time.
Andrew Swallow
William Black - 25 Jan 2008 17:57 GMT
>>When reasonably cheap (for a given value of 'cheap') GPS clocks (accurate
>>to
[quoted text clipped - 5 lines]
> radio time signals. What does the GPS system use for a clock? Cesium
> beam stuff, maybe?
No idea.
Nobody cares as long as it works.
As I said, it's now a governmental problem.
Nobody, short of a major government, cares.

Signature
William Black
I've seen things you people wouldn't believe.
Barbeques on fire by the chalets past the castle headland
I watched the gift shops glitter in the darkness off the Newborough gate
All these moments will be lost in time, like icecream on the beach
Time for tea.
Jack Linthicum - 25 Jan 2008 20:01 GMT
On Jan 25, 12:00 pm, richardcas...@earthlink.net (Richard Casady)
wrote:
> On Fri, 25 Jan 2008 12:25:05 +0530, "William Black"
>
[quoted text clipped - 9 lines]
>
> Casady
http://www.spectracomcorp.com/Home/Applications/GPSClockSynchronization/tabid/10
0/Default.aspx
http://en.wikipedia.org/wiki/Global_Positioning_System
Les Cargill - 25 Jan 2008 23:37 GMT
>> When reasonably cheap (for a given value of 'cheap') GPS clocks (accurate to
>> 10 to the -16) became available everyone threw their old cesium beam stuff
[quoted text clipped - 5 lines]
>
> Casady
It doesn't really matter what's behind it - the economic value of the
GPS signal itself depends on really well-engineered clocking regimes
behind the scenes. It just publishes a clock for your local equipment
to use.
--
Les Cargill
>>>>> It's a stopped clock that's right once a year...
>>>>
[quoted text clipped - 18 lines]
> cesium beam stuff in the bin. That's why you can pick them up for the
> scrap value these days, nobody uses them anymore.
Exactly - but you were talking about having an LO - I thought
perhaps you hobbied in that direction.
--
Les Cargill
William Black - 26 Jan 2008 06:25 GMT
>>>>>> It's a stopped clock that's right once a year...
>>>>>
[quoted text clipped - 22 lines]
> Exactly - but you were talking about having an LO - I thought
> perhaps you hobbied in that direction.
Good grief no.
Everyone with a TV has a local oscillator.
I was never a radio amateur, I was always a radio professional. :-)

Signature
William Black
I've seen things you people wouldn't believe.
Barbeques on fire by the chalets past the castle headland
I watched the gift shops glitter in the darkness off the Newborough gate
All these moments will be lost in time, like icecream on the beach
Time for tea.
>>>>> It's a stopped clock that's right once a year...
>>>>
[quoted text clipped - 4 lines]
>>>
>>> One that tells me it's dawn on midsummer's day is of little use to me...
AIUIl your statement is backwards ......
When it's dawn (and specific alignments are observed) it tells you that it
_is_ midsummer's day!
It demonstrated the day not the time (dawn).
--
Brian
Eugene Griessel - 26 Jan 2008 07:50 GMT
>>>>>> It's a stopped clock that's right once a year...
>>>>>
[quoted text clipped - 10 lines]
>_is_ midsummer's day!
>It demonstrated the day not the time (dawn).
Was it Bob Newhart, in one of his sketches (on henge building), who
said "lets scrape the snow off and see" on being told it indicated
midsummer.
Eugene L Griessel
Smash forehead on keyboard to continue...
- I usually post only from Sci.Military.Naval -
John Briggs - 26 Jan 2008 14:41 GMT
>>>>>>> It's a stopped clock that's right once a year...
>>>>>>
[quoted text clipped - 16 lines]
> said "lets scrape the snow off and see" on being told it indicated
> midsummer.
He might have been right - the reverse alignment indicates sunset in
midwinter...

Signature
John Briggs