[time-nuts] "GPS once a day issues" ?
hmurray at megapathdsl.net
Mon Oct 20 17:15:28 UTC 2014
kb8tq at n1k.org said:
> The combination of the constellation and the ionosphere are what I believe
> give you the once a day (rather than once per 12 hours) bump.
There is another layer. In addition to the "normal" once-a-day type
differences, the pattern of satellites drifts slowly from day to day. So
there is another pattern with a period of something like a month. If you
have a marginal setup, for example an indoor antenna, you can see things like
the holdover times drifting both in time-of-day when they happen and in
length of holdover as the satellite pattern at dawn/dusk changes.
Of course, at that level of detail, there are lots of other contributions
like rain that will also show up and may be more important.
These are my opinions. I hate spam.
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