I have encountered GPS active antennas that are unstable and oscillate, especially when not mounted on a metal backing. One even oscillated occasionally when it did have a ground plane. Because the ceramic patch antenna is narrowband and has a high Q, the spurious oscillation is relatively stable in frequency, and of course very close to 1575MHz where patch resonates. One such faulty antenna I had once jammed every other GPS receiver in the house - although they were all the old 2nd generation type receivers of two decades ago
Andy www.g4jnt.com On Sat, 2 Apr 2022 at 19:27, Lux, Jim <[email protected]> wrote: > I encountered a weird problem when I hooked up 4 OEM GPS modules to 4 > Beaglebones.. Side by side, they wouldn't all get GPS lock. It turns out > the (unshielded) receivers radiate enough stuff to foul up adjacent > receivers. Move them several meters apart and no problems. I didn't > get around to seeing if there is some effect on the timing performance, > even if they "get lock", but I'll bet there is. A _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
