[time-nuts] Survey plot as art.

Gary E. Miller gem at rellim.com
Mon Jan 9 15:23:34 EST 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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