[GPS_Standard] GPS Modules with 1PPS output

[Bert, VE2ZAZ]

Hi Zach,

> Are these units better for our purposes than a Jupiter 12 board?
The instinctive answer would be yes. The Jupiter 12 board is a
navigation-grade GPS and the Oncore UT+ is of timing grade. Timing-grade
receivers "typically" deliver an accuracy one order of magnitude better than
navigation-grade. BUT, it all depens on whether the system's overall
accuracy and stability will be enhanced by a better GPS. I can tell you that
to obtain a range of accuracy typically in the low 10^-10's, an
automotive-grade GPS is fine on my system.

I have not personally tried better-grade GPS receivers though. In the end,
since we average out the GPS inaccuracies over a long period (hours), the
benefit may not be so obvious on my system.  It might be beneficial,
especially for shorter sampling periods. Worst case, you would not see much
improvement. On better (commercial-grade, more complex, better designed)
systems, it would definitely make a difference.

In the end, everything counts. But your whole system has to be solid,
including OCXO, thermal stability, DC supply stabilit, etc.

Cheers,

Bert, VE2ZAZ

----- Original Message -----
From: "Zack Widup" <w9sz at prairienet.org>
To: <gps_standard at mailman.qth.net>
Sent: Thursday, January 24, 2008 10:15 AM
Subject: Re: [GPS_Standard] GPS Modules with 1PPS output



Are these units better for our purposes than a Jupiter 12 board?

Zack W9SZ

On Thu, 24 Jan 2008, Graham Haddock wrote:

> Stephen:
>
> Try:
>
> www.ebay.com
>
> Item number: 130163912842
> Motorola R5122U1154 Precision timing GPS Oncore module.
>
> I have bought several from this seller with good results.
> He ships worldwide.
>
> --- Graham / KE9H
>
______________________________________________________________
GPS_Standard mailing list
Home: http://mailman.qth.net/mailman/listinfo/gps_standard
Help: http://mailman.qth.net/mmmain.htm
Post: mailto:GPS_Standard at mailman.qth.net