Gang, FYI:
LIGHTSQUARED TECHNICAL WORKING GROUP REPORT. Granted in part
Lightsquare's Motion for Extension of Time. Extended the time for
filing comments in response to the Public Notice. (Dkt No. 11-109 ).
Action by: Chief, International Bureau. Comments Due: 03/16/2012.
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Hi:
Has anyone done stability plots on the Heathkit GC-1000? Although it's a clock good to 0.1 seconds, it's also a WWV
disciplined oscillator (WWVDO).
The linear power supply makes use of a 7805 and so heats up the enclosure which is hard on the electrolytic caps but
also acts as a crystal
Hi
Spectracom used to be in the WWVB / OCXO combo business. They had a few that
likely fit the modern definition of disciplined. I don't think anybody ever
did a WWV disciplined unit. The path delay issues are just to crazy.
Back when they were new, NBS / NIST was not very happy about the
Hi
The basic issue is that below a certain dollar volume you go from being a
factory direct account to being a distributor account. There is a little
wiggle room in most contracts about the point that happens, but not a whole
lot. Most of us simply do not do the millions of dollars / year volumes
Does an NTP server using WWV as a reference clock count as a WWVDO?
If so then there are likely a few of them around.
I have a really nice RF front from an old WWV receiver that I want to
get working. Well it does work but I'm using a general coverage
reciever to convert the IF to audio, need to
Hi
I would guess that to count as disciplined, the OCXO (or Rb) needs to be
phase or frequency locked to the incoming signal. NTP normally just does an
estimate of where things should be and moves on.
With either WWVB or WWV, the phase change in the carrier is pretty massive.
To use carrier
In the late 70s I added WWVB to the micro that controlled
my RTTY autostart station. A circuit in an application manual
demodulated the WWVB signal and a software loop synced
to the on-the-second transitions and decoded the time information.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com
On Mar 1, 2012, at 11:41 AM, Brooke Clarke bro...@pacific.net wrote:
Are there any WWVB disciplined oscillators (WWVBDO)?
I have a couple of Spectracom 8164 WWVB DOs running. They bounce around by a
part or three in 10e10.
The 8164 uses an FLL that does 1000 second counts of the internal
A friend in Texas has confirmed that Loran signals are now up and
receivers are showing position. I am including a note from UrsaNav
regarding this event.
TIME FOR LIFE
UrsaNav Testing Wide-Area Timing Alternative
February 29, 2012. This week, for the first time since August 2010,
advanced
Well that would indeed be one heck of a late xmas present will fire up the
system tonight
THANK you
Paul
WB8TSL
On Thu, Mar 1, 2012 at 5:45 PM, Greg Broburg semif...@comcast.net wrote:
A friend in Texas has confirmed that Loran signals are now up and
receivers are showing position. I am
Apologies if this is a dupe -- I'm not sure it ever made it to the list:
The attached plot indicates the phase noise performance obtainable with
a wideband FET (OPA653) input opamp.
With a 10MHz +9dBm input, the phase noise floor is around -163dBc/Hz at
1kHz offset and around -154dBc/Hz at
Greg wrote:
A friend in Texas has confirmed that Loran signals are now up and
receivers are showing position. I am including a note from UrsaNav
regarding this event.
What are the odds that any long-term deployment would be
backward-compatible with legacy Loran receivers (not the same as
Hi
It would be interesting to find a few more details...
Bob
On Mar 1, 2012, at 8:06 PM, paul swed paulsw...@gmail.com wrote:
Well darn
Though I can hear them on the longwire with a hp3586. It appears the loran
c preamp may have bit the dust. I checked the austrons with the simulator
and
Terrific news!
-John
Well darn
Though I can hear them on the longwire with a hp3586. It appears the loran
c preamp may have bit the dust. I checked the austrons with the simulator
and they are doing fine.
Will have to look at the preamp this weekend. Easily fixable generally
Hi
The obvious advantage to backwards compatibility would be much greater coverage
area. It is a bit tough to envision them getting a reasonable user population
with a 100% from scratch approach. Indeed that may be wishful thinking.
Bob
On Mar 1, 2012, at 8:09 PM, Charles P. Steinmetz
Eloran is compatible with the older timing rcvrs. Or at least it was
supposed to be. Now the message suggests that they will try other
modulation modes. I couldn't find anything really further then what was
sent.
I did hook the longwire directly to the austron so far no lock and I am
less then 70
Hmmm did find a paper that suggests various goals and such and the old
loran gear might not work. Depends on what modes they try.
Would be great to find some form of updated news.
Regards
Paul.
On Thu, Mar 1, 2012 at 8:25 PM, paul swed paulsw...@gmail.com wrote:
Eloran is compatible with the
A document I found via UrsaNav's web site describes the basic premise of
eLORAN, and indicates that it is intended to be backward compatible,
although the timing and navigation performance will not be any better than
before. This seems reasonable. The 'e' part adds a data channel that adds
Bob wrote:
The obvious advantage to backwards compatibility would be much
greater coverage area. It is a bit tough to envision them getting a
reasonable user population with a 100% from scratch approach. Indeed
that may be wishful thinking.
Well, if they get no revenue from legacy users,
On Thu, Mar 1, 2012 at 6:25 PM, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
Well, if they get no revenue from legacy users, how does the increased user
base benefit them (and, thus, why would they care)? The only path I see is,
Get 'em hooked using their old receivers, and...
Government subsidy, like letting them use the frequency?
On 3/1/2012 8:09 PM, Charles P. Steinmetz wrote:
Greg wrote:
A friend in Texas has confirmed that Loran signals are now up and receivers
are showing position. I am including a note from UrsaNav regarding this event.
What are the odds
The publication in the federal register, here
http://www.gpo.gov/fdsys/pkg/FR-2012-01-11/html/2012-307.htm
says they are playing with more than Loran. There are
several MF bands they are playing with as well, in particular
the dGPS bands and 500 kHz.
I noticed a while ago that UrsaNav's
I have a problem with two pendulum clocks that interfere with each
other, even though they are bolted to a brick wall on bedrock
foundations.
A solution to this problem is to run one on mean time the other on
sidereal time. Then I can analyse the operation of each of them.
Now there is a
What sort of accuracy can I expect from a Loran type system?
I assume the answer is it depends, but I'm looking for the overview type
answer. What does it depend upon? What are the ballpark type answers? What
info should I be providing to get better answers?
I assume it depends upon the
In my experience, Loran C will get you into a foot ball field
sized area of where you are going, day or nite, rain or shine.
The big difference is Loran C needs a more substantial antenna
than does GPS. I don't think you will be finding a reliable
Loran C receiver in a smart phone.
-Chuck
Keith Peshak has a setup located in Georgetown Texas that tracks the
position of a fixed Loran antenna and an fixed GPS antenna. The Loran
beats the GPS all of the time does not need wide area augmentation to
nail down the center of a runway.
On 3/1/2012 10:26 PM, Hal Murray wrote:
What sort
I about agree. It consistently nailed my position w/in about 100 feet on a
LORAN Chart using an early uP (8085) based receiver (Appelco). The
antenna was a Radio Shack whip with a preamp at its base.
With an Austron 2100F against a Rb and Oscilloquartz or HP 117A things
were reliably in few in
had a sailboat in the 80s and 90s, used a West Marine LORAN receiver and
antenna... easily got better than 100' accuracy and repeatability, year
after year. we went to the same anchor holes all the time, took angular
sights to confirm the LORAN. loved it. never had a GPS until after the
John Miles wrote:
Apologies if this is a dupe -- I'm not sure it ever made it to the list:
The attached plot indicates the phase noise performance obtainable with
a wideband FET (OPA653) input opamp.
With a 10MHz +9dBm input, the phase noise floor is around -163dBc/Hz at
1kHz offset and
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