[time-nuts] WTB: GPS Antenna Splitter

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


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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