[time-nuts] WTB: GPS Antenna Splitter

Dave M dgminala at mediacombb.net
Wed Oct 8 11:29:07 EDT 2014

I haven't been able to find any information on antenna spacing on any of the 
GPS mfr's or antenna mfr's web sites.  Maybe I just don't know the correct 
search terms.
Can anyone point me to a source for that kind of data?

There's a LOT of information about GPS, GPSDO and antennas on the web, and 
I'll admit that I haven't read it all, but there's just not enough time in a 
day, and my eyes can't stand the strain to read everything.

Point me in the right direction and I'll take it from there.

Dave M

Bob Camp wrote:
> Hi
> You might want to check the spacing spec’s on the antennas you have.
> Some of them have fairly large spacing recommendations (like > 10
> feet).
> 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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