[time-nuts] A bit more on what going on with the Loran sites
paulswedb at gmail.com
Tue Mar 27 18:07:55 UTC 2012
So they have a station in boston
I would have volunteered but the email they give did not actually work and
really did not have a chance to call them. Lame excuse
On Tue, Mar 27, 2012 at 1:49 PM, Pete Lancashire <pete at petelancashire.com>wrote:
> From GPS World
> This week, UrsaNav once again transmitted from the former USCG Loran
> Support Unit (LSU) facility in Wildwood, New Jersey. To ensure that
> those interested understand that the USCG has no intent to acquire,
> operate, or provide a wireless time technology or services, UrsaNav
> has renamed the LSU — it's new facility name is the Diamond Beach
> Facility, or “dBF.”
> In a statement released today, UrsaNav said:
> "Our main purpose for on-air testing at this time is to demonstrate
> wide-area precise time distribution using terrestrial, ground-wave RF
> solutions. However, a robust timing solution uses on-signal data
> channel(s) for nanosecond-level corrections, so we are also testing a
> variety of modulation techniques that provide significant throughput
> gains over the current 100-180 BPS methods.
> "Our current equipment suites consist of the Nautel NL Series
> prototype transmitters, Symmetricom Timing and Frequency Equipment
> (TFE), and UrsaNav UN-150 eLoran Timing Receivers.
> "We are not simply transmitting eLoran. We are also evaluating some
> improvements to eLoran that do not change the underlying signal
> structure. Finally, we are testing various alternative LF solutions
> that include new waveforms and modulation techniques.
> "We have established preliminary monitor sites at five locations:
> Boston, Massachusetts; Chambersburg, Pennsylvania; Leesburg and
> Chesapeake, Virginia; and Charleston, South Carolina. We are scouting
> for additional monitor sites at distances of up to 1,500 miles from
> our current transmitting location.
> "During this week’s testing, we tightened the synchronization of our
> transmissions to within 10 ns of UTC. We tested continuously for
> periods in excess of 24 hours. Without the use of any propagation
> corrections or differential monitoring, we successfully demonstrated
> UTC traceability to within +/- 30 ns at 160 miles and to within +/- 70
> ns at 500 miles. Several acquisition trials showed that our receivers
> can very quickly acquire the LF signal and steer to within 50 ns of
> UTC. At all distances, our receivers met the ITU and ETSI Maximum Time
> Interval Error (MTIE) masks for Primary Reference Clocks.
> "Additional on-air tests are planned for next week, so stay tuned for
> the third part of our continuing series on wide-area timing."
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