[LinuxPPS] Problems using Garmin 18x LVC, Debian src ntp_4.2.6.p2, NMEA driver, linuxpps and 2.6.34.1 pristine kernel

[Udo van den Heuvel]

On 2010-09-15 07:14, TomK wrote:
> new PPS source serial4 at ID 
> PPS source #0 "/dev/ttyS4" added

ID .... ?
(bug, feature, copy/paste failure?)

> new PPS source serial5 at ID 1
> PPS source #0 "/dev/ttyS5" added

*Second* PPS source #0?!

What if we try just one pps source? (not setting up a second one, etc)

> 14 Sep 20:00:47 ntpd[24461]: GPS_NMEA(0) 8034 84 reachable
(...)
> 14 Sep 21:59:36 ntpd[24461]: GPS_NMEA(1) 8014 84 reachable

Hmmm. Works?!

> remote                  st t when poll reach   delay   offset  jitter
> ==============================================================================
> xGPS_NMEA(0)            0 l    8   16  377    0.000  -856.17  15.785
> xGPS_NMEA(1)            0 l   25   64  377    0.000  -856.62  25.490
> xntp1                   3 u   25   64  377   72.080  -373.66  36.942
> xtriangle               2 u   60   64  177   68.474  -385.83  40.975

Offset is large.
What if it comes down?
Does it in fact come down?

> Something is not right! 

Why?

> Garmin 18x LVC are set to 200ms pps pulse width.

Good.

> The serial card is 8x,

Why?

> so I must set the GPS units to 38400 baud in order to communicate with
> them at 4800 baud.

Why?
I only know of cases the other way round to go beyond 115k2 bps.

Udo