[time-nuts] gps timing antennas

[Brian Kirby]

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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