[ntp:questions] Offset Average (Normal)?

Alby VA albyva at empire.org
Tue Mar 13 03:21:13 UTC 2012


On Mar 12, 11:09 pm, Bruce Lilly <bruce.li... at gmail.com> wrote:
> On Mon, 12 Mar 2012 18:27:52 -0700, Alby VA wrote:
> >  My whole setup isn't anything special. SureGPS is modified so you get
> > PPS.
> > RS232 cable to COM1 on a FreeBSD box. USB providing power. And several
> > NIST/USNO servers in ntp.conf for reference.
>
> "COM1" on FreeBSD?!?  Are you sure?
>
> If really a tty, is it a normal implementation or via a USB conversion?
>
> For USB, a 1 ms pk-pk sawtooth is the best one can achieve.



 The USB is just providing power to the SureGPS. The RS232 is handing
the
Rx/Tx/PPS and such. Everything is coming in on /dev/cuau0.


FYI:
------
godzilla# cat /dev/cuau0
$GPGGA,032052.000,3903.1188,N,07729.1077,W,
1,10,0.85,104.9,M,-33.4,M,,*52

$GPGSA,M,3,06,23,07,03,13,08,11,01,28,19,,,1.60,0.85,1.35*09

$GPGSV,3,1,12,19,76,085,31,07,69,315,42,03,41,050,31,13,38,218,30*77

$GPGSV,3,2,12,11,32,160,35,08,31,315,22,06,28,048,30,16,19,074,*79

$GPGSV,3,3,12,23,17,193,29,01,12,165,30,28,09,272,27,43,,,*48

$GPRMC,032052.000,A,3903.1188,N,07729.1077,W,0.03,203.72,130312,,,A*7C

$GPGGA,032053.000,3903.1188,N,07729.1077,W,
1,10,0.85,104.9,M,-33.4,M,,*53

$GPGSA,M,3,06,23,07,03,13,08,11,01,28,19,,,1.60,0.85,1.35*09

$GPGSV,3,1,12,19,76,085,31,07,69,315,42,03,41,050,31,13,38,218,30*77

$GPGSV,3,2,12,11,32,160,35,08,31,315,23,06,28,048,30,16,19,074,*78

$GPGSV,3,3,12,23,17,193,29,01,12,165,30,28,09,272,27,43,,,*48

$GPRMC,032053.000,A,3903.1188,N,07729.1077,W,0.03,203.72,130312,,,A*7D

$GPGGA,032054.000,3903.1188,N,07729.1077,W,
1,10,0.85,104.9,M,-33.4,M,,*54

$GPGSA,M,3,06,23,07,03,13,08,11,01,28,19,,,1.60,0.85,1.35*09

$GPGSV,3,1,12,19,76,085,31,07,69,315,42,03,41,050,31,13,38,218,30*77

$GPGSV,3,2,12,11,32,160,35,08,31,315,22,06,28,048,30,16,19,074,*79

$GPGSV,3,3,12,23,17,193,29,01,12,165,30,28,09,272,26,45,,,*4F

$GPRMC,032054.000,A,3903.1188,N,07729.1077,W,0.08,203.72,130312,,,A*71

^C









More information about the questions mailing list