[time-nuts] WTB: GPS Antenna Splitter

Bob Camp kb8tq at n1k.org
Mon Oct 6 21:09:33 EDT 2014


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. 


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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