[amsat-bb] Re: GPS Time observation

George and Cheryl Abbott ka1ajf at cox.net
Thu Feb 2 08:57:45 PST 2012


I'm not sure about GPS,but I have noticed that the clock on our cable box is 
off by up to 4 seconds at times.Customer service was not aware or concerned 
when I let them know.

-----Original Message----- 
From: Vince Fiscus, KB7ADL
Sent: Thursday, February 02, 2012 10:28 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] GPS Time observation


I have an old GPS unit, a Magellan explorist 210.  It's fairly accurate
determining position. After it has acquired about eight to ten satellites
the position error averages between 20 to 35 feet.   Now the question, the
other day I was looking at one of the information pages the unit can
display and on it, it gives the time in UTC. Just for fun I thought I would
see how close the time was to WWV.  I was surprised to see the unit was
between one to four seconds off over various tests compared to WWV.  IS
this typical of all GPS units or do some display the time of day more
accurately?

KB7ADL

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