[time-nuts] Trimble L1/L2 GPS Antenna PN: 27947-00

Bob Camp kb8tq at n1k.org
Tue Jun 16 11:13:06 UTC 2015


I’ve played with one of those ...

Ok, that’s the antenna that turned into the “micro centered” version. The antenna came
out in the same era as the 4000 series survey GPS units. With the ground plane it’s quite
large. It does pretty well with the ground plane, but good luck finding a place to mount it. 

Like many of the Trimble survey antennas, that one has about a 50 db amplifier in it. That
amp will overdrive most GPSDO’s. It also needs a supply up around +12 rather than the more
normal (on timing gear) +5V.


> On Jun 16, 2015, at 1:11 AM, M. George <m.matthew.george at gmail.com> wrote:
> Hello, ​I snagged a Trimble GPS 27947-00 on the usual auction site awhile
> back... I hope I didn't snag it from other time-nuts that were bidding...
> Anyway, it showed up today and it cleaned up really nice.
> I couldn't help 'not' opening it up to take a peek... see the pictures
> here:
> Trimble L1/L2 GPS Antenna 27947-00
> <http://www.nc7j.com/downloads/NG7M/Time-Nuts/Trimble%2027947-00%20GPS%20L1%20L2%20Antenna/>
> I can't find hardly anything at all on this part number... I looked at
> KO4BB's manual pages trying to find something and gave it my best Google
> shot.  Is there a common model number that I'm missing?
> What convinced me to go after a better antenna were comments from Bob and
> others and I think I got a good deal on this.  Was it a good find... and
> are time-nuts using these with the Trimble ground plane in permanent
> installs with the ground plane attached. (sorry for my ignorance here, but
> I'm not finding too much based on my searching around and I'm a newbie
> time-nut)
> I don't have anything that would use the L2 frequencies yet... or maybe
> ever, but it's amazing how well this thing is built.  I'm interested to see
> the difference it will show compared to my $30 bullet.
> Any insight would be helpful...  mount suggestions... etc... over kill?
> Max NG7M
> -- 
> M. George
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