[time-nuts] eBay GPS antenna.
kb8tq at n1k.org
Tue Feb 6 09:18:24 EST 2018
There is no need for something this exotic for L1 only reception. It *is*
nice to have Glonass L1, but that’s about the extent of how fancy you
need to go.
As noted in another post, the preamp gain probably is pretty high
on this antenna. That’s a standard that goes back to the early days of
Trimble survey GPS gear. It’s great if you happen to want to drive a
32 port resistive splitter for your collection of GPSDO’s. If you have more
modest needs for splitting, pads would be a very good idea.
> On Feb 6, 2018, at 8:08 AM, John Green <wpxs472 at gmail.com> wrote:
> Thanks for the responses. It looks similar to but not exactly like the two
> antennas referenced. They say the preamp is 3 to 5.5 volts, whereas the
> eBay antenna says its preamp is good from 3.3 to 18 volts, indicating I can
> run it off 12 volts. Regarding the internals, I must have somehow missed
> the photo which clearly shows it to be a patch antenna. It looks pretty
> similar to the Trimble I asked about recently, inside, that is. That
> Trimble had been dropped from a great height. The nylon screws that hold
> the actual antenna assembly had all been broken. I ordered new ones and
> replaced them. Disassembly was easy, reassembly not so much. Mine was made
> to have the groundplane, but doesn't have it. I suspect that since I am not
> doing surveying, it won't matter all that much. I bought an adapter for the
> 5/8 by 11 thread it uses and have a pvc pipe mount ready to go up. My
> location is not ideal. It will be atop a 40 foot Rohn 25 tower, but there
> are tall trees nearby. Since my Z3801 died, I don't have much of a GPSDO to
> use the antenna with. Just a couple of T bolts and some kind of postcard
> sized unit I need to build a housing and power supply for. Still, enough to
> experiment with.
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