Looking for information regarding Trimble 33429-00 microcentered GPS antenna.
I have been gone for a good while, but now that I am officially retired, I
thought I would get back into the time/frequency hobby. I recently bought a
Trimble 33429-00 antenna off eBay. I can't seem to find much on the
internet about it. Google has not been my friend. First, I assume the
"micro centered" refers to the phase center being located with precision.
Mine was meant to be used with the ground plane, which did not come with
it, so the marks indication the part to be pointed north are missing. It
doesn't matter in my use since I won't be surveying anyway. Can someone
tell me what voltage it takes? I decided that the Leica choke ring antenna
I got a while back took 12 volts because the power input went to an 8 volt
regulator, and I figured 12 volts should work ok. On this one, the power
goes to a 2951 adjustable regulator, leaving me a bit in the dark. I will
probably try hooking an adjustable power supply to it and slowly raising
the voltage until the output of the regulator stabilizes. They seem to have
made two versions of this antenna. One with groundplane, and one without.
Since I will be feeding a GPSDO, would a groundplane be of benefit? In
looking through the archives, it seems I have missed a lot of good
discussions. Good to be back.
Hi
It is very much a 12V antenna. It also is a “50 db gain” antenna as well.
Most of the timing gear is looking for 20 to 30 db less gain than that in
an antenna. The good news is that you can run a really big splitter after
one to drive lots of stuff. The bad news is that you may still need attenuators.
Looking at the snow piles on my GPS antennas, I would not recommend using
the ground plane. It will significantly increase the load on the mount ….
Bob
On Jan 18, 2018, at 1:39 PM, John Green wpxs472@gmail.com wrote:
I have been gone for a good while, but now that I am officially retired, I
thought I would get back into the time/frequency hobby. I recently bought a
Trimble 33429-00 antenna off eBay. I can't seem to find much on the
internet about it. Google has not been my friend. First, I assume the
"micro centered" refers to the phase center being located with precision.
Mine was meant to be used with the ground plane, which did not come with
it, so the marks indication the part to be pointed north are missing. It
doesn't matter in my use since I won't be surveying anyway. Can someone
tell me what voltage it takes? I decided that the Leica choke ring antenna
I got a while back took 12 volts because the power input went to an 8 volt
regulator, and I figured 12 volts should work ok. On this one, the power
goes to a 2951 adjustable regulator, leaving me a bit in the dark. I will
probably try hooking an adjustable power supply to it and slowly raising
the voltage until the output of the regulator stabilizes. They seem to have
made two versions of this antenna. One with groundplane, and one without.
Since I will be feeding a GPSDO, would a groundplane be of benefit? In
looking through the archives, it seems I have missed a lot of good
discussions. Good to be back.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
On Thu, Jan 18, 2018 at 1:39 PM, John Green wpxs472@gmail.com wrote:
I have been gone for a good while, but now that I am officially retired, I
thought I would get back into the time/frequency hobby. I recently bought a
Trimble 33429-00 antenna off eBay. I can't seem to find much on the
internet about it. Google has not been my friend. First, I assume the
"micro centered" refers to the phase center being located with precision.
Mine was meant to be used with the ground plane, which did not come with
it, so the marks indication the part to be pointed north are missing.
I believe that there is a little white line on the antenna itself, which
indicates which corner faces North.
Doesn't hurt to try orient it that way.
W
It
doesn't matter in my use since I won't be surveying anyway. Can someone
tell me what voltage it takes? I decided that the Leica choke ring antenna
I got a while back took 12 volts because the power input went to an 8 volt
regulator, and I figured 12 volts should work ok. On this one, the power
goes to a 2951 adjustable regulator, leaving me a bit in the dark. I will
probably try hooking an adjustable power supply to it and slowly raising
the voltage until the output of the regulator stabilizes. They seem to have
made two versions of this antenna. One with groundplane, and one without.
Since I will be feeding a GPSDO, would a groundplane be of benefit? In
looking through the archives, it seems I have missed a lot of good
discussions. Good to be back.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/
mailman/listinfo/time-nuts
and follow the instructions there.
--
I don't think the execution is relevant when it was obviously a bad idea in
the first place.
This is like putting rabid weasels in your pants, and later expressing
regret at having chosen those particular rabid weasels and that pair of
pants.
---maf
Hi
Since this is an L1 / L2 antenna, there are a lot of things you might be doing with it.
If indeed dual frequency GPS is part of the intended use, the survey oriented gear
will be slightly happier if the “right” corner faces north. It only really counts in that sort
of L1 / L2 data reduction setting. Of course, if you are really after “the best”, that’s the
way to go ….
Bob
On Jan 19, 2018, at 9:50 AM, Warren Kumari warren@kumari.net wrote:
On Thu, Jan 18, 2018 at 1:39 PM, John Green wpxs472@gmail.com wrote:
I have been gone for a good while, but now that I am officially retired, I
thought I would get back into the time/frequency hobby. I recently bought a
Trimble 33429-00 antenna off eBay. I can't seem to find much on the
internet about it. Google has not been my friend. First, I assume the
"micro centered" refers to the phase center being located with precision.
Mine was meant to be used with the ground plane, which did not come with
it, so the marks indication the part to be pointed north are missing.
I believe that there is a little white line on the antenna itself, which
indicates which corner faces North.
Doesn't hurt to try orient it that way.
W
It
doesn't matter in my use since I won't be surveying anyway. Can someone
tell me what voltage it takes? I decided that the Leica choke ring antenna
I got a while back took 12 volts because the power input went to an 8 volt
regulator, and I figured 12 volts should work ok. On this one, the power
goes to a 2951 adjustable regulator, leaving me a bit in the dark. I will
probably try hooking an adjustable power supply to it and slowly raising
the voltage until the output of the regulator stabilizes. They seem to have
made two versions of this antenna. One with groundplane, and one without.
Since I will be feeding a GPSDO, would a groundplane be of benefit? In
looking through the archives, it seems I have missed a lot of good
discussions. Good to be back.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/
mailman/listinfo/time-nuts
and follow the instructions there.
--
I don't think the execution is relevant when it was obviously a bad idea in
the first place.
This is like putting rabid weasels in your pants, and later expressing
regret at having chosen those particular rabid weasels and that pair of
pants.
---maf
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.