[time-nuts] Looking for information regarding Trimble 33429-00 microcentered GPS antenna.

Warren Kumari warren at kumari.net
Fri Jan 19 09:50:31 EST 2018

On Thu, Jan 18, 2018 at 1:39 PM, John Green <wpxs472 at 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.

> 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.
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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

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