[time-nuts] GPS orthodontics: sawteeth & hanging bridges

Randy Warner Randy at synergy-gps.com
Thu Dec 21 16:44:19 EST 2006


PHK,

Oooooooh. Did you have the original UT v1.3 firmware in that one? That
firmware sucked big time. 


Randy 
________________________________________________________________________
_________________________

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Thursday, December 21, 2006 1:42 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS orthodontics: sawteeth & hanging bridges

In message
<D6D8D27B5219D649A005529978F791371CCD3C at SBSERVER.Synergy-GPS.sbs>, "
Randy Warner" writes:

>Those of you who worked with the UT+ receiver may remember a problem 
>with the time slips in one version of firmware. Motorola updated the 
>firmware to do some minor housecleaning and accidentally messed up the 
>100PPS.

It also messed up the 1Hz by about 50nsec under some set of
circumstances in an early UT+ version.  I had to jump really high to get
the local rep+moto to reflash my receiver so I could verify they had
fixed it, a few days before I brought my work to the 1998 USENIX ATC.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by
incompetence.

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