[time-nuts] GPS dropouts and crystals

Randy Warner Randy at synergy-gps.com
Mon Sep 11 15:11:11 UTC 2006


John,

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

Randy
________________________________________________________________________
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-----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:

>John,
>
>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
---
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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