[time-nuts] Survey plot as art.
Gary E. Miller
gem at rellim.com
Mon Jan 9 20:23:34 UTC 2017
Yo Björn!
On Mon, 9 Jan 2017 07:45:00 +0100
"Björn Gabrielsson" <bg at lysator.liu.se> wrote:
> >> My gut reaction is that "coupling" between the two antennas may
> >> have some effect on some of the variation.
>
> For high accuracy applications, I have been given the advice to keep
> GPS antenna separation much higher. 1 meter separation was suggested.
Clearly the Adafruit is not high accuracy. I have played with some
short baseline DGPS (cm level data) and not found any issue with antenna
separation.
> For comparing GPS receiver behavior its a cleaner setup to use a GPS
> signal splitter (or basic RF splitter with suitable DC-blocks).
Care to recommend any that have SMA connectors? I have found that
a 3dB difference in antenna can degrade my data quality, it would be
interesting to see how the 3dB loss of the splitter affects thins.
RGDS
GARY
---------------------------------------------------------------------------
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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