Hi
Also consider that the “trip” was not very quick. They were a: spend day or
three here, go there (day of travel), spend several days someplace else, move
on to next location. Eventually you returned the clock to it’s starting point.
The “trip” was only good to something related to the drift
What would be more interesting would be to adjust the temperature of the GPS
receiver's oscillator to eliminate the hanging bridges altogether, kind of like
Trimble does with the Thunderbolt, except that they do it directly instead of
indirectly. That may require to characterize the crystal
I suggested yesterday to periodically heat and cool the oscillator, but my post
may have been lost in the noise.
Bob
From: Didier Juges shali...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tuesday, March 4,
Hanging bridge? What is it; where is it found; and how does it form?
My guess is that a Google or Wikipedia search is going to come up with
something named Golden Gate or maybe a musical term.
Tom Holmes, N8ZM
-Original Message-
From: time-nuts-boun...@febo.com
Hi Tom,
You may have missed TVB's post yesterday, quoted below. A hanging bridge is
an area on a timing receiver's plotted sawtooth correction value that stays on
one side of phase zero for some period of time. As a result of this bias, a
GPSDO that is not corrected for sawtooth will
thol...@woh.rr.com said:
Hanging bridge? What is it; where is it found; and how does it form?
Tom Clark and Rick Hambly: Timing for VLBI
http://gpstime.com/files/tow-time2009.pdf
tvb: Motorola GPS M12+ Sawtooth
http://www.leapsecond.com/pages/m12/sawtooth.htm
--
These are my opinions.
Thanks Hal. Makes sense now. Just didn't have the right context in mind for
the term.
I see from tvb's paper that the Golden Gate result would have had a
connection :-).
Tom Holmes, N8ZM
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of
Since the original question was about alternatives to the traveling
clock method before the advent of GPS, I remember two that were used by
NASA to check the synchronization of their Deep Space Network facilities
around the world.
- Moon bounce: A PN code was modulated on a microwave signal
Hi
Be careful of what you wish for.
One way to “eliminate” the hanging bridge is to have the oscillator exactly on
frequency. That sounds fine. The problem is that you are always in the middle
of a bridge. The other way is to put the oscillator well off frequency. That
way you have lots of
Hi All,
I was wondering if anyone here has a spare WWVB Remodulator or would be
interested in building one for some money, I cant solder anymore due to
health problems. I have a Spectracom Netclock/2 here that I am trying
to get to work with the new WWVB format. Please contact me off list if
you
tom jones wrote:
I haven't rulled out dopplar shift or my mis-understanding of how gps works
and what msg 30 really means.
Perhaps the sat is broadcasting the bias and drift every minute and the gps
receiver is dummer than I thought ?
I believe message 30 is about the local clock in the GPS
There is time code generation software included with the standard
distribution of NTP. This will create amplitude modulated time code
and send it out an audio port. This actually generates the signal not
re-generates it.Then you send this to some signal generator that
has an AM input and
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