[time-nuts] gps timing antennas
WB6BNQ
wb6bnq at cox.net
Wed Feb 13 21:57:46 EST 2008
Hi Brian,
Have you ever published your efforts with making the choke ring out of pie plates
? If so do you have that available with, hopefully, pictures, deminsions and so
forth ? I have one of the Timing 2000 antennas. Did you use the choke ring pie
plate with it ?
thanks,
73....Bill....WB6BNQ
Brian Kirby wrote:
> 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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