[time-nuts] To use or not to use transmission line splitters for GPS receivers

Magnus Danielson magnus at rubidium.dyndns.org
Wed Oct 10 08:08:58 UTC 2012


On 10/10/2012 06:30 AM, Hal Murray wrote:
>
> albertson.chris at gmail.com said:
>> The satellites are in 12 hour orbits.  Everything repeats every 12 hours.
>> But the sun is on a 24 hr. period and if you did two 12 hour tests you don't
>> want to do one at night and one in day.   So start each test at the same
>> time of day let it run for 12+ hours.
>
> Thanks.
>
> After poking around a bit...
>
> That's 12 Sidereal hours rather than 12 UTC hours.

Rarther, it's 11 hours and 58 minutes UTC.

It revolves about 2x366.35 times the globe over a year. I don't remember 
why they choose such an orbit, but it has its uses.

Cheers,
Magnus



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