J
John Miller
Voice said:
Yes, that's right.
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Can atomic clock in Houston receive NIST signal?
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- Start date
Yes, that's right.
DaveM said:
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...)
J
James T. White
I live in Houston and bought one of the cheap "Atomic Clocks" at the drugstore.
It took several days but it did finally sync. It seems to do better when placed
by a window. Turning off your cell phone and bluetooth equipment shouldn't be
necessary since they operate at much higher frequencies than the 60 KHz NIST
signal unless they are right next to each other. The biggest sources of
interference for the NIST signals is likely to be the power supplies in your
computer and TV so locate the clock as far away from them as possible.
The sync normally takes place in the wee hours of the morning when the radio
propagation characteristics of the atmosphere are more favorable so be patient.
Good luck.
V
Voice of freedom
Well sorta but not to the same receivers. The shortwave crowd still uses
the HF band transmissions to calibrate their receivers, I suppose.
J
John Miller
You'll find the answer in the link you posted. In the left panel, click
on 'WWV' and 'WWVB'.
--
John Miller
email domain: n4vu.com; username: jsm(@)
Surplus (For sale or trade):
Tektronix 465B oscilloscope
New Fellowes leather brief/notebook case
F
Fred Abse
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?
F
Fred Abse
No, it doesn't. At 60KHz, propagation is almost entirely ground wave,
which is why they picked that frequency to do the job, since you don't get
the phase distortion associated with ionospheric propagation.
J
Jim Thompson
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
J
Joseph
Pick up the phone and dial 303-499-7111!
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D
DaveM
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!!
V
Voice of freedom
Jim Thompson said:
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.
M
Mike Smith
Return it.
I have a $17 Sams' Club atomic clock that stays in synch, and it's
battery operated.
Mike Smith
F
Fred Abse
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
M
Mike Smith
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
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.
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.
F
Fred Abse
What do you wear the rest of the time? ;-)
V
Voice of freedom
Mike Smith said:
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.
M
Mike Smith
Clock-wise... nothing, but I do have a cell phone in my pocket...
Mike Smith
