| Author |
Message |
Jim Thompson
Guest
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 Posted:
Sat Mar 05, 2005 9:32 pm Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Sat, 05 Mar 2005 14:36:01 +0000, Fred Abse
<excretatauris@cerebrumconfus.it> wrote:
| Quote: | On Fri, 04 Mar 2005 16:47:48 -0700, Jim Thompson wrote:
So you use an electrically-shielded loop antenna.
Nice big chunk of ferrite's good.
How the hell do they get antennas that work inside those radiocode wrist
watches? Do they craftily use the strap?
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I don't know, but wouldn't surprise me.
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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Joseph
Guest
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| Posted:
Sun Mar 06, 2005 5:32 am Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Fri, 04 Mar 2005 16:59:34 -0600, Voice of freedom
<VoiceFreedom@freedom.naa> wrote:
| Quote: | I've had all kinds of problems with mine too, and I live in Denver, fer
pete's sake!
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Pick up the phone and dial 303-499-7111! :)
- - - - - - - - - - - - - - - - - - - - - - - - - - |
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DaveM
Guest
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| Posted:
Sun Mar 06, 2005 6:10 am Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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<zeytuntsyan@gmail.com> wrote in message
news:1109990603.199306.98080@f14g2000cwb.googlegroups.com...
| Quote: | DaveM wrote:
WWVB at 60Khz is a ground wave over the coverage area. That's why a
VLF
frequency was chosen for the broadcast. Typically, frequencies below
1 MHz
are not reflected by the ionosphere. Propagation is best at night
because
the D-Layer of the ionosphere is heavily ionized during daytime hours
by the
sun, and causes heavy absorption of the radio energy. Since the
sun's
effects are minimal at nighttime, the broadcast signal is least
absorbed,
increasing signal strength over the area of coverage.
--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate
characters in
the address)
Never take a laxative and a sleeping pill at the same time!!
I am not really aware of the technical details but I did read that "The
LF signal propagates by groundwave, following the curvature of the
earth; the HF signal propagates by skywave, and bounces off the
ionosphere. All signals travel at the speed of light." from
http://www.boulder.nist.gov/timefreq/stations/overview.html
Which I must honestly say confuses me even more...How come there is
mention of two signals? Does that mean the information is simulcasted?
(This clock has taken up more of my time than I'd have expected...)
|
The time signal is not simulcast on ground wave and sky wave. The ground
wave and sky wave are phenomena based mainly upon transmitted frequency.
Since the VLF broadcast of 60 KHz is far below the frequencies that are
affected by the D-Layer of the ionosphere, its propagation is almost
entirely by ground wave. It isn't reflected back to earth by the
ionosphere.
The HF broadcasts of WWV and WWVH are reflected by the ionosphere and,
although there is a ground wave present in the HF broadcasts, the sky wave
is predominant. The signal that is reflected by the ionosphere is called
the "sky wave". That's why LF and VLF broadcasts have significantly shorter
range than HF broadcasts. Amateur radio broadcasts in the HF bands can be
heard around the world because of the signals bouncing between the
ionosphere and the ground. Since the 60 KHz signal is not reflected by the
ionosphere, it doesn't enjoy the wide coverage of the HF broadcasts.
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)
Never take a laxative and a sleeping pill at the same time!!
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Voice of freedom
Guest
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| Posted:
Sun Mar 06, 2005 6:10 am Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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Jim Thompson <thegreatone@example.com> wrote :
| Quote: | On Sat, 05 Mar 2005 14:36:01 +0000, Fred Abse
excretatauris@cerebrumconfus.it> wrote:
On Fri, 04 Mar 2005 16:47:48 -0700, Jim Thompson wrote:
So you use an electrically-shielded loop antenna.
Nice big chunk of ferrite's good.
How the hell do they get antennas that work inside those radiocode wrist
watches? Do they craftily use the strap?
I don't know, but wouldn't surprise me.
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
|
That's the frustrating thing, I have an atomic watch and it never fails to
synch right, but that Atomix clock in my room will unsynch all the time and
I can only keep it in one place in the room for it to work most of the
time, I can't even hang it on the wall where I want it.
--
A Voice Of Freedom in the
United States of America |
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Mike Smith
Guest
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| Posted:
Sun Mar 06, 2005 7:13 pm Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Sat, 05 Mar 2005 21:56:19 -0600, Voice of freedom
<VoiceFreedom@freedom.naa> wrote:
| Quote: | Jim Thompson <thegreatone@example.com> wrote :
On Sat, 05 Mar 2005 14:36:01 +0000, Fred Abse
excretatauris@cerebrumconfus.it> wrote:
On Fri, 04 Mar 2005 16:47:48 -0700, Jim Thompson wrote:
So you use an electrically-shielded loop antenna.
Nice big chunk of ferrite's good.
How the hell do they get antennas that work inside those radiocode wrist
watches? Do they craftily use the strap?
I don't know, but wouldn't surprise me.
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
That's the frustrating thing, I have an atomic watch and it never fails to
synch right, but that Atomix clock in my room will unsynch all the time and
I can only keep it in one place in the room for it to work most of the
time, I can't even hang it on the wall where I want it.
|
Return it.
I have a $17 Sams' Club atomic clock that stays in synch, and it's
battery operated.
Mike Smith |
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Fred Abse
Guest
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| Posted:
Sun Mar 06, 2005 10:04 pm Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Sat, 05 Mar 2005 08:32:40 -0700, Jim Thompson wrote:
| Quote: | Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
|
I wear a $120 Bulova. 15 seconds slow since November. I sync it about once
in six months.
About the same accuracy for six times the price :-)
--
Then there's duct tape ...
(Garrison Keillor) |
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Mike Smith
Guest
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| Posted:
Sun Mar 06, 2005 10:26 pm Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Sun, 06 Mar 2005 16:04:50 +0000, Fred Abse
<excretatauris@cerebrumconfus.it> wrote:
| Quote: | On Sat, 05 Mar 2005 08:32:40 -0700, Jim Thompson wrote:
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
I wear a $120 Bulova. 15 seconds slow since November. I sync it about once
in six months.
About the same accuracy for six times the price :-)
|
I have a $9.95 walmart watch/stopwatch. It's dead-on accurate.
I wear it about 4 times a year.
Mike Smith |
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Guest
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| Posted:
Sun Mar 06, 2005 11:37 pm Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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9:35am Pacific Standard Time, Clock has successfully (finally)
synchronized as denoted by a solid tower icon on the clock. Checked
with online NIST time down to the second the time is exact. Los Angeles
had clear skies today for the first time in over 2 weeks I don't know
if that means anything but just thought I'd note the fact. Also, the
unit was not moved or changed in any way from the way I left it. |
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Fred Abse
Guest
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| Posted:
Mon Mar 07, 2005 12:13 am Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Sun, 06 Mar 2005 16:26:02 +0000, Mike Smith wrote:
| Quote: | On Sun, 06 Mar 2005 16:04:50 +0000, Fred Abse
excretatauris@cerebrumconfus.it> wrote:
On Sat, 05 Mar 2005 08:32:40 -0700, Jim Thompson wrote:
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
I wear a $120 Bulova. 15 seconds slow since November. I sync it about once
in six months.
About the same accuracy for six times the price :-)
I have a $9.95 walmart watch/stopwatch. It's dead-on accurate.
I wear it about 4 times a year.
|
What do you wear the rest of the time? ;-)
--
Then there's duct tape ...
(Garrison Keillor) |
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Voice of freedom
Guest
|
| Posted:
Mon Mar 07, 2005 12:46 am Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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Mike Smith <mws@wt.net> wrote :
| Quote: | On Sat, 05 Mar 2005 21:56:19 -0600, Voice of freedom
VoiceFreedom@freedom.naa> wrote:
Jim Thompson <thegreatone@example.com> wrote :
On Sat, 05 Mar 2005 14:36:01 +0000, Fred Abse
excretatauris@cerebrumconfus.it> wrote:
On Fri, 04 Mar 2005 16:47:48 -0700, Jim Thompson wrote:
So you use an electrically-shielded loop antenna.
Nice big chunk of ferrite's good.
How the hell do they get antennas that work inside those radiocode
wrist watches? Do they craftily use the strap?
I don't know, but wouldn't surprise me.
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
That's the frustrating thing, I have an atomic watch and it never fails
to synch right, but that Atomix clock in my room will unsynch all the
time and I can only keep it in one place in the room for it to work most
of the time, I can't even hang it on the wall where I want it.
Return it.
|
I can't, I bought it 2 years ago, and it's been a pain ever since. I just
won't buy Atomix ever again, especially since they ignored my request for
help with it. It may have been a bad model and if they supported it, they
could have gone under. Let them go under, I won't buy an Atomix product
ever again.
--
A Voice Of Freedom in the
United States of America |
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Mike Smith
Guest
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| Posted:
Mon Mar 07, 2005 3:05 am Post subject:
Re: Can atomic clock in Houston receive NIST signal? |
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On Sun, 06 Mar 2005 18:13:01 +0000, Fred Abse
<excretatauris@cerebrumconfus.it> wrote:
| Quote: | On Sun, 06 Mar 2005 16:26:02 +0000, Mike Smith wrote:
On Sun, 06 Mar 2005 16:04:50 +0000, Fred Abse
excretatauris@cerebrumconfus.it> wrote:
On Sat, 05 Mar 2005 08:32:40 -0700, Jim Thompson wrote:
Me, I wear a $20 Timex, that I sync to NIST about once-a-month.
Usually out no more than 4 seconds.
I wear a $120 Bulova. 15 seconds slow since November. I sync it about once
in six months.
About the same accuracy for six times the price :-)
I have a $9.95 walmart watch/stopwatch. It's dead-on accurate.
I wear it about 4 times a year.
What do you wear the rest of the time? ;-)
|
Clock-wise... nothing, but I do have a cell phone in my pocket... :-P
Mike Smith |
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