[time-nuts] gps timing antennas
Brian Kirby
kirbybq at bellsouth.net
Wed Feb 13 21:44:22 EST 2008
The Motorola Timing 2000 and 3000 antennas are patch antennas. They
have a pointed radome. The have very little ground plane, which reduces
reception near the ground, which is desirable because of multipath
effects. They also have quite a bit of filtering, so transmitting
antennas near the units, will not affect them.
If you are not having a problem with multipath, a regular patch type
antenna probally from anybody should work well.
If you are having multipath problems a timing antenna should help or a
choke ring assembly should help. I have built choke rings out of pie
plates, and Dr. Tom Clark made a basic choke assembly using a common
electric junction box.
I had problems with multipath because of mountains about 3/5 around my
location. I changed the look angles so my receivers only receive above
20 degrees above the horizon and I use timing antennas now.
Brian KD4FM
Matt Ettus wrote:
> Is there really anything in particular which is different about the
> antenna requirements of timing receivers as compared to ordinary
> high-quality receivers? The timing antennas seem to be in pointy
> radomes, so that tells me they are probably quad-helixes rather than
> patch antennas. How is that advantageous for timing in particular?
>
> Thanks,
> Matt
>
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