Bob, Thanks for that. My intent was to mount the antennas on yardarms on a
mast. Both antennas will be at the same elevation, just separated
horizontally by a couple feet (not 10ft).
My concern (and I think you answered it) was how far apart could I place the
antennas without having to do another survey when I switch them around.
As an alternative, I could enter the antenna coordinated manually into each
GPS when I switch antennas. That should avoid a new survey each time.
Then, the distance between the antennas shouldn't matter.
Thanks for the info!!
Dave M
Bob Camp wrote:
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 <dgmin...@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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