[time-nuts] WTB: GPS Antenna Splitter

John C. Westmoreland, P.E. john at westmorelandengineering.com
Mon Oct 6 21:38:11 EDT 2014


Dave,

Can you please let us know what you go with for your splitter choice?

I noticed companies like EndRun Technologies use ones from these folks:
http://gpsnetworking.com/GPS-antenna-splitters.asp

TESSCO might stock those if you ask them.

Regards,
John W.


On Mon, Oct 6, 2014 at 6:09 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> Missed the survey question…
>
> If a ns in free air is about 1 foot (30 cm), then you probably want a
> survey that is better than 6” to keep the error down. You do not want to
> have the antennas on top of each other, so yes, the GPS will need a survey
> / location each time you change antennas. If you go with the 10’ spacing,
> then you will get some pretty big jumps without switching the location.
>
> Bob
>
> On Oct 6, 2014, at 4:01 PM, Dave M <dgminala at mediacombb.net> wrote:
>
> > Does anyone in the group have, or can point me to, a low-cost (but not
> > cheap) 2-port splitter for a GPS antenna?  Those on Ebay are rather
> > expensive.
> >
> > I have two GPSDO units, and have both an older timing antenna and a new
> > choke ring antenna (Thanks, Pete L).  I already have one 2-port splitter
> > (working well), but my intent is to connect both antennas through the
> > splitters and a couple coaxial relays so that I can, with the twist of a
> > switch, allow me to run each GPS from a different antenna, or both from
> the
> > same antenna.  I would like to gather some data as to the differences
> > between the two antennas.  I know I could switch the connections
> manually,
> > but I like the idea of a switch to sort of automate the connections, and
> I'd
> > need another splitter anyway.
> >
> > Before I go to the trouble and expense of building upon this idea, are
> there
> > any comments as to the value of the project?
> > Some questions come to mind:
> > I'm thinking about mounting both antennas on the same mast, at the same
> > elevation, just separated by a couple feet.  Any problems that I should
> be
> > aware of by putting both antennas so close together?  Will that small
> > distance have a noticeable effect when switching a receiver from one
> antenna
> > to the other?  Will the GPS notice the difference and want to do another
> > survey?
> >
> > Thanks for your comments.
> > Dave M
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