PSN-L Email List Message

Subject: Re: Clock drift ?
From: "Geoffrey" gmvoeth@...........
Date: Sat, 27 Jan 2007 10:00:13 -0700

With any robot clock you must maintain
synchronization as often as possible and
your quartz crystal should be both calibrated
and oven controlled at some temp greater or lower
then will ever be experienced
at its location.
Most military oscillators are oven controlled
about 140deg fahrenheit which keeps it above
the hottest days.

----- Original Message ----- 
From: "Jón Frímann" 
To: "PSN-Postlist" 
Sent: Saturday, January 27, 2007 5:32 AM
Subject: Clock drift ?

> Hi all
> I think my system did suffer from a GPS connection loss for some unkown
> reasons. This appears to have resaulted in a rater annoying clockdrift.
> Or at least I think so. Clear examples are in my latest traces. I didn't
> notice this, because WinSDR did show (L) as normal. But normally, when
> the GPS clock drops out, it shows (N). The computer clock is in check
> with NTP program that I am running, so drift in the computer clock is
> minimal.
> A earthquake that is 82 km away from me.
> A earthquake that is 182 km away from me.
> Is this a resault of a clock drift or a wrong p and s model. I've would
> like to know. I did reboot the PSN hardware and I think everything is
> back to normal for now, it appears. At least the p and s wave are in
> correct places now.
> Regards.
> -- 
> Jón Frímann
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