Loran can do great frequency measurement -- almost as good as GPS. But
for timing, it's not so hot. The problem with current Loran is that it
doesn't carry a timecode, or mark the second epoch. It's possible to
recover 1pps from Loran with a bit of work (the Austron 2100T receiver
can
The US is keeping Loran-C going as a backup for GPS as well.
How good is Loran for timekeeping? How does it compare to WWVB?
What sort of receiver do I need? Any good how-to type web pages?
I'm in Silicon Valley. The NIST map says that WWVB should work here, but my
quick try didn't
:37
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Loran - any good for timekeeping?
The US is keeping Loran-C going as a backup for GPS as well.
How good is Loran for timekeeping? How does it compare to WWVB?
What sort of receiver do I need? Any good
In message:
robkimberley1$86.140.134.222$.!!AAAYAOYAZyOzV8ERq+LmT45ypI7CgAAAEHZ+5J10IM9Kj/[EMAIL
PROTECTED]
Rob Kimberley [EMAIL PROTECTED] writes:
: Long time since I played with a LORAN-C timing receiver, but the Austron
: units were good to a microsecond.
A few parts in 10E12. WWVB is junk compared to Loran-C
-Chuck Harris
Hal Murray wrote:
The US is keeping Loran-C going as a backup for GPS as well.
How good is Loran for timekeeping? How does it compare to WWVB?
What sort of receiver do I need? Any good how-to type web pages?
Hal Murray wrote:
The US is keeping Loran-C going as a backup for GPS as well.
How good is Loran for timekeeping? How does it compare to WWVB?
What sort of receiver do I need? Any good how-to type web pages?
I'm in Silicon Valley. The NIST map says that WWVB should work here,
Hi Poul:
What is a Frame rate cyclic averaging buffer? Is this where you use
a GRI generator to trigger sampling the incoming signal?
I've found that the quality of LORAN-C for timing depends on how close
you are to the transmitter. When in the 100 mile range the quality is
equal to
On Fri, April 21, 2006 19:53, John Ackermann N8UR said:
Loran can do great frequency measurement -- almost as good as GPS. But
for timing, it's not so hot. The problem with current Loran is that it
doesn't carry a timecode, or mark the second epoch.
It's possible to
recover 1pps from
In message [EMAIL PROTECTED], Brooke Clarke writes:
Hi Poul:
What is a Frame rate cyclic averaging buffer? Is this where you use
a GRI generator to trigger sampling the incoming signal?
It is a buffer which can hold one FRI worth of samples into which I
average the received signal.
In other
In message [EMAIL PROTECTED], M. Warner Losh writes:
Can't you recover the time by tracking multiple chains and using the
relationship between them to come up with at least small number of
possible seconds? Hasn't the US started broadcasting data that can be
used to know which second you are at?
In message [EMAIL PROTECTED], Poul-Henning Kamp writes:
In message [EMAIL PROTECTED], M. Warner Losh writes:
Can't you recover the time by tracking multiple chains and using the
relationship between them to come up with at least small number of
possible seconds? Hasn't the US started
In message [EMAIL PROTECTED], Brooke Clarke writes:
The neat thing about the Locus LORAN-C receivers is that they are all
in view instead of being tied to a single GRI.
http://www.locusinc.com/loran.html
Yeah, I do that in my own Loran-C software receiver too.
I also find that using the
In message: [EMAIL PROTECTED]
Brooke Clarke [EMAIL PROTECTED] writes:
: Theoritically you could use stations from different chains to get a
: position fix.
As long as you can see more than one station from each chain, since
the position fix is established using the differential time
Hi John:
Setting the 2100T is really a two step process. After you have done
all the setup possible and then connect you house 1 PPS and put in a
phony TOC that's say 10 seconds ahead, then at the TOC the 2100T will
sync it's 1 PPS output (you will get a red error light). You need to do
I have to look at the Austron 2100T manual to get the exact sequence of
events, but basically you set the clock, feed an external PPS signal
that is roughly accurate (within some tens of milliseconds, I think),
and then enter the next time of coincidence (TOC) which you obtain from
the
Hi Brooke --
Thanks for that. I was going from memory as the manual is at home and
I'm not. I set the time with the 2100T several months ago but haven't
played with that functionality since.
John
Brooke Clarke wrote:
Hi John:
Setting the 2100T is really a two step process. After
Hi Tom:
If you're in the U.S. here's a list of stations:
http://www.pacificsites.com/~brooke/Loran-c.shtml
I'm not sure how to find the others.
Have Fun,
Brooke Clarke
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Hi:
Just added links on many of the names to sattelite photos of the LORAN-C
stations. The scale is different for different locations. In some
places it gets down to 1 meter. So far the most photogenic one is Dana, IN.
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