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.
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