I can assure you the GSM shacks have GPS timing in them. I can dig up the photos if you want.
-----Original Message----- From: "Joseph Orsak" <jor...@nc.rr.com> Sender: time-nuts-boun...@febo.com Date: Sat, 15 Dec 2012 18:24:20 To: Discussion of precise time and frequency measurement<time-nuts@febo.com> Reply-To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Cell timing error AT&T uses UMTS in most areas which is a "self-synchronizing" modulation scheme. Supposedly one of the selling points is "no dependence on GPS". All the extra sync channels and sync messaging is a capacity hog, not a very spectrally efficient standard in my opinion. About 85 maximum simultaneous voice calls in a 5Mhz UL / 5 Mhz DL sector/carrier before it starts to fall apart. A big step backwards from good old CDMA2000 (also just my opinion). But hey, you can surf the web while you talk on the same device. -Joe W4WN ----- Original Message ----- From: "Jim Lux" <jim...@earthlink.net> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Saturday, December 15, 2012 5:43 PM Subject: Re: [time-nuts] Cell timing error > On 12/15/12 2:16 PM, Scott McGrath wrote: >> In a prior life we had a CDMA timing receiver for NTP which used VZ for >> its source >> >> On Dec 15, 2012, at 12:18 PM, Graham / KE9H <time...@austin.rr.com> >> wrote: >> >>> You should switch to Verizon. >>> They are inherently accurate to milliseconds. >>> Sub micro-seconds inside the base stations. >>> >>> >>> On 12/15/2012 12:51 PM, Greg Troxel wrote: >>>> In central mass, AT&T and tracfone (? carrier) are showing phone times >>>> very close to 1 min slow. Virgin/sprint is ok. I've never seen this >>>> before - usually it's a few s slow. >>>> > > > The time *displayed* on the phone might not reflect the time from the > network. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.