[time-nuts] WTB: GPS Antenna Splitter
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
> 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
> Thanks for your comments.
> Dave M
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