[time-nuts] Jupiter GPS receiver

Magnus Danielson cfmd at bredband.net
Thu Jan 5 11:47:15 EST 2006

From: Brian Kirby <kirbybq at bellsouth.net>
Subject: Re: [time-nuts] Jupiter GPS receiver
Date: Wed, 04 Jan 2006 20:59:13 -0600
Message-ID: <43BC8B81.1010104 at bellsouth.net>

> I looked in my data and their spec sheet shows +/- 1 microsecond.  But, 
> I beleive this was much better than that.  I cannot find it, but I 
> beleive I seen a report where somebody compared the Jupiter and it was 
> in the 120 to 150 nanosecond class.

+/- 1 microsecond is the old worstcase garantee for the GPS system. It is was
you can expect from a GPS with lack of satellites, SA and old style satellites
going out of date in their predicted orbits data.

These days we have better satellites, full system and no SA. Add to that much
improved receivers (no more 1 channel receivers as in the good old days).


> Alberto di Bene wrote:
> >Poul-Henning Kamp wrote:
> >  
> >
> >>You need to time the 1PPS signal to get the precise time, the
> >>serial timecode alone, NMEA or not, doesn't do it.
> >>
> >>    
> >>
> >Does anybody have reliable data on the jitter present on the 1pps signal
> >of the Rockwell/Navman GPS boards ?
> >
> >I used in the past a 8-channel Motorola VP Oncore for a GPSDO, and it works very well.
> >Now I am intending to build another, and bought a Rockwell TU30-D165-003
> >(this is what is marked on the PCB). I haven't been able to find the exact
> >specs of this model. What I would like to know is if its jitter is comparable
> >to that of the VP Oncore or much worse. I don't care about NMEA problems,
> >just the jitter is what interests me.
> >I have also an old 6-channel Basic Oncore board. Would this be a better choice
> >than the Rockwell?  TNX
> >
> >73  Alberto  I2PHD
> >
> >
> >
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> >  
> >
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