On 2015-02-16 02:57, Hal Murray wrote:
[email protected] said:
I can only suspect it was unlocked, but I need to setup all the test in
another place closer to the window, since I don't have a splitter to use the
same antenna of the thunderbolt.
If one or both are unlocked, I'd expect them to drift, not rapidly, but I'll
bet it's easy to measure if you wait a day.
There is software to talk to TBolts so it should be easy to find out if it is
locked.
Have you tried any software on the Rockwell? It may even talk NMEA so all
you have to do is connect it to a PC and guess the baud rate.
Or maybe upload a picture and somebody will recognize the model so you can
google for details.
See http://gpskit.nl for Rockwell commercial GPS module info.
Those modules have an MCX/OSX antenna connector to connect a
passive ceramic patch or active GPS antenna.
They talk NMEA @ 4800,N,8,1 or Rockwell Zodiac binary @ 9600,N,8,1,
depending on jumper settings.
Rockwell Zodiac binary may be like SiRF binary as those appear
to originally have been designed as Zodiac/Jupiter replacements.
PPS accuracy is stated as 1us.
There are instructions on the web to make a dipole GPS antenna
from a length of coax cable: remove the outer insulation, trim
the outer shield and inner conductor to 46mm, and heat shrink
tubing (or tape?) to form the T shape.
You could stick that out of a gap in a window facing towards the
equator with a clear view of the sky.
--
Take care. Thanks, Brian Inglis
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