[time-nuts] TruePosition GPSDO Holdover Issues

Bob kb8tq kb8tq at n1k.org
Tue May 15 15:56:17 EDT 2018


> On May 15, 2018, at 3:52 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> One thing to consider - if you get far enough north, the “hole” closes and
>> you can get sat tracks from the other side of the north pole. Yes they are a
>> *long* ways away. It’s no worse than a lot of tracks that GPS thinks are
>> perfectly fine to use. For timing they aren’t going to do much good. They
>> will improve a navigation
> Neat.  Thanks.  That raises several questions.
>  How high do satellites get if you are at a pole?
>  What is the best or worst latitude for timing?
>  What is the best/worst latitude for doing a survey?

The answer for both timing and survey is that you want to be on the equator as far
as sat elevation / tracks go. As long as you are “in the tropics” it is just about as good.


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