Re: [gpsd-users] PPS MID 52 (0x34) working?

[Gary E. Miller]

Yo Alexander!

On Sun, 03 Jun 2012 11:58:34 -0700
Alexander Carver <address@hidden> wrote:

> I have a question about the SiRF PPS message MID 52 and whether it's 
> actually working in gpsd 3.4 (haven't quite updated to 3.6 yet).  I'm 
> playing around with turning MID 52 on and off and have noticed that I 
> get less wander in the offset to the SHM that is sent over to ntpd.

I suggest to just totally ignore the MID 52.  Its accuracy compared
to the PPS is 10,000x worse.

> With MID 52 on, my offset wanders +/-40ms.  With MID 52 off, the
> wander is reduced to about +/-10ms.

Big deal.  Your PPS should be just a few micro Sec jitter, thus the
uselessness of the MID 52.

Just be sure your NMEA is running faster than 4800, preferably 38,400
or better.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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