[time-nuts] WTB: GPS Antenna Splitter

Tim Shoppa tshoppa at gmail.com
Mon Oct 6 16:31:59 EDT 2014


At the very low end, a F-cable splitter for like Cable TV will likely (*)
get the job done. Many of us are already using RG-6 type cable for the GPS
antenna run anyway.

(*) Some GPS units may get confused if they have active sensing on the
antenna preamp current and this goes out of tolerance.

On Mon, Oct 6, 2014 at 4:01 PM, Dave M <dgminala at mediacombb.net
<javascript:_e(%7B%7D,'cvml','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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