Antenna Cable problems.

Hi,

The simple answer to your questions is no, not unless
you have some expensive equipment available like a
network analyser or a signal generator and receiver
or a gps simulator. The other option is to try and
measure if the active antenna is drawing any current.
By putting an ammeter in the dc bias path. But the
easiest thing to do is to remake your connection,
also just using a crimp connector is not always good
enough at these frequencies you are best off with one
that needs soldering to make sure you have a good
connection.

Mark  


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>Subject : RE: opensource_gps Digest, Vol 65, Issue 1
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Today's Topics:

   1. Antenna modification - False Acquisitions problem
      (Siddharth Paliwal)


----------------------------------------------------------------------

Message: 1
Date: Sat, 5 Feb 2011 12:35:05 +0530


Hello,

I am running the GPL-GPS code on the GPS600 receiver
that I purchased from
GPS Creations. I had to modify my Antenna(Trimble)
cable length for some
reasons, so I got the cable shortened and got another
connector re-crimped
to it. But this modified Antenna seems to have some
problems. Now I am
unable to get lock on satellites, but there seem to
be a large no. of False
Acquisitions, in the sense that most of the channels
(out of 12 available)
now transition upto the Pull-in state and then fall
back to Acquisition
state. And the code seems to be running perfectly
fine with an unmodified
Trimble Antenna (tracking up to 6-7 satellites !!).
Is there any way to check if there are any problems
with my modified Antenna
(probably Impedance matching problems?) besides
running it on the GPS
receiver and checking If I'm able to lock satellites
or not. And also what
are the possible places at which I might have gone wrong?
Any help would be highly appreciated.

Thanks.

-- 
Siddharth Paliwal
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