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

Bob kb8tq kb8tq at n1k.org
Fri Jan 19 11:38:49 EST 2018


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 ….


> On Jan 19, 2018, at 9:50 AM, Warren Kumari <warren at kumari.net> wrote:
> 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.
> 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.
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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
> pants.
>   ---maf
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