[time-nuts] Survey plot as art.

Gary E. Miller gem at rellim.com
Sat Jan 7 16:26:40 EST 2017

Yo Bob!

On Sat, 7 Jan 2017 16:16:44 -0500
Bob Camp <kb8tq at n1k.org> wrote:

> In terms of multipath at GPS frequencies, a couple of inches is a
> *lot*. Also unless you have pretty good antennas (as in much larger
> than 1” each) they will have phase issues unique to each antenna.
> Phase cancellation and addition is what gives you multipath.

I see up to 10x better/worse between GPS brands.  Measured by CEP().  A
much smaller change between antenna models.  I also have interchanged
antennas between my GPS to rule them out as the major contributing
source to error and discard the worst ones.

I just started 24 hour plots of 4 adjacent GPS.  I guess tomorrow I'll
rotate the antennas between GPS, witout moving the antennas, and repeat.

I suspect we may be just seeing different aspects of the same thing.  A
big difference between GPS models is probably the quality of multipath
rejection.  And I can easily change my GPS, but chaning my geoplogy is a
lot harder.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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