[time-nuts] GPS dropouts and crystals

Randy Warner Randy at synergy-gps.com
Mon Sep 11 11:11:11 EDT 2006


Yep, position scatter is another tell-tale, along with a longer TTFF.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Neon John
Sent: Saturday, September 09, 2006 12:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS dropouts and crystals

On Thu, 7 Sep 2006 11:20:14 -0700, "Randy Warner"
<Randy at synergy-gps.com> wrote:

>I would tend to believe the problem you are having is more receiver 
>related. If your entire satellite display is going red it means you are

>losing all the SV's at once. While it's true that there are some pretty

>big holes in the system right now, you shouldn't just lose everything 
>at once.
>The problem could be anything from a bad antenna to a receiver problem.
>Working with GPS receivers for the last 10 years I have seen many cases

>of the receiver just dumping everything. It usually comes down to an 
>antenna connection problem or a crystal/TCXO problem in the receiver.

Thanks for the info.  I kinda thought this might be in the receiver but
since the subject of GPS outage came up I thought I'd ask.  This unit is
one of those little dongle units that is powered by the USB bus and uses
the SiRF chip set.  I have noticed more stationary scatter than with my
better receivers so I've suspected the crystal clock from the beginning.

John De Armond
See my website for my current email address http://www.neon-john.com
Cleveland, Occupied TN Don't let your schooling interfere with your
education-Mark Twain

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