Actually, the Lucent software uses RAIM, and reports the value in its status message. If the position appears to have drifted off, or there aren't enough satellites to calculate the position, the software declares the oscillators to be free-wheeling, an expression meaning that the oscillators are free from discipline and are now drifting.
So yes, the positioning aspects matter. Disclaimer: I haven't studied RAIM (or TRAIM) enough to know exactly what goes on, but that's the behavior I've observed. Bill Hawkins -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Gregory Beat Sent: Friday, October 02, 2015 6:07 PM To: [email protected] Subject: Re: [time-nuts] KS-24361 REF-0 standalone Dan - I have been following your experimentation with the surplus Lucent KS-24361 REF-0 module, to transform it into a standalone GPSDO. The original usage of the classic Oncore UT+ GPS receiver for KS-24361 REF-1, by Symmetricom / Datum for Lucent, was deliberate. For usage at a cellular data/telecom site, the focus was on the timing and frequency discipline from the GPS satellite transmission, rather than the position or dead reckoning aspects -- used by smartphones, automobiles, and other GPS applications on the market. === A couple of comments. While I can appreciate being economical (main criteria) and selecting the NEO-6M receiver, I believe that a u-Blox timing specific module (like LEA-6T) would be more desirable in this application. In addition, the u-Blox 6-series is the trailing edge of product support (market demand dictates its continuance), while the 7 and 8-series are their current modules (largely for the cellular / mobile industry (smartphones or cell sites themselves) u-Blox 6-series Timing Application Note (using the LEA-6T) https://www.u-blox.com/sites/default/files/products/documents/Timing_App Note_%28GPS.G6-X-11007%29.pdf IF you successfully adopt the u-Blox module to correctly "mimic" the Oncore UT+ GPS receiver command suite, THEN you open up a larger audience of "time-nuts" and Frequency Standard users (HP Z3801A frequency standard universe) as a receiver alternative. http://www.realhamradio.com/GPS_Frequency_Standard.htm These users may desire a "newer" GPS receiver that has more channels (8-channel); latest generation receiver; access to the newest GPS constellations. TAPR might be interested in sponsoring, as a kit/module, if a wider audience existed. The Heol Designs N024 receiver (France) accomplished this replacement role for the Trimble ACE II/III GPS receiver used in the Symmetricom/Datum TymServe TS2100. Their solution resolved shortcomings in the mid-1990 Trimble receiver design and giving this Symmetricom NTP server, time IRIG-B time code generator, and 10 MHz reference appliance a new lease on life (no longer a door stop). http://www.heoldesign.com/index.php?module=products&action=catalog&cat=1 4&id=54 w9gb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
