On 11/23/19 5:23 PM, Bob kb8tq wrote:
Hi
Most of what you see suggests > 10’ / 3M between GPS antennas. They seem to be
concerned about
a variety of things. Exactly how those concerns translates into the magic
distance has always been a
bit obscure.
3m/10 ft is "round number phenomenon".
For identical receivers, there's always the issue of LO leakage back
through the antenna, and into the other receiver. The LOs/clocks aren't
going to be exactly the same (the crystals are probably 1ppm or
something like that), so you wind up with a 1kHz tone on top of your PN
code.
I suppose the same is generically true of any receivers. I have
experienced this both with disparate and identical receivers, back in
1993 with handheld receivers (Trimble, Magellan) side by side, and newer
ublox NEO-7
Bob
On Nov 23, 2019, at 7:07 PM, JAMES ROBBINS <[email protected]> wrote:
I would appreciate feedback on the question of the ill effects (if any) of
mounting two GPS antennas in proximity to one another. I am intending to mount
a 58532A L1 antenna and a L1/L2 antenna on the same mast on my roof separated
by around 1-2 feet. I have attached a photo to show the intended installation.
(Mast is clamped into the right side aluminum channel.) My concern is “shading”
of one antenna over the other. Thanks for the consult.
Jim Robbins
N1JR
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