[amsat-bb] Re: GPS Time observation

[Jim Jerzycke]

Ahhh...., yes. "UTC". That's what I meant by "Earth Time".

Need...more...coffee...

73, Jim

On 02/02/2012 08:44 PM, jmfranke wrote:
> The difference between GPS time and UTC is adjusted as necessary. The 
> adjustments come in the form of leap seconds and are added when needed 
> at the end of June or December. The difference between GPS time and 
> UTC is currently 15 seconds. There will be a leap second added this 
> coming June 30. What is being seen is the casual user GPS receiver 
> software does not put a high priority on time display.
>
> John  WA4WDL
>
> --------------------------------------------------
> From: "Jim Jerzycke" <kq6ea at verizon.net>
> Sent: Thursday, February 02, 2012 3:18 PM
> To: <amsat-bb at amsat.org>
> Subject: [amsat-bb] Re: GPS Time observation
>
>> I think this has something to do with "GPS Time" vs "Earth Time".
>>
>> IIRC, GPS time doesn't take into account the Leap Seconds that have 
>> been added to Earth time since the first GPS satellites have been 
>> launched. I think some of the newer receivers can compensate for 
>> this, but I'm not sure.
>>
>> It's been about 14 years since I last worked in the GPS industry, and 
>> I'm a bit rusty on all the new stuff!
>>
>> 73, Jim  KQ6EA
>>
>> On 02/02/2012 04:57 PM, George and Cheryl Abbott wrote:
>>> 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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>>
>> _______________________________________________
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>
>