It's not only the antenna. Newer 1000 boards and all 2k's have a
GPS+GLONASS receiver. They also updated the 450AP a couple years ago
with a revision that includes this receiver. GPS-only kinda always
sucked. With GLONASS added, you have a lot more sats available, so the
probability of maintaining lock is much, much better. I really wish
Forrest would start using this in his pipes and boxes.
Typically moving the antenna a few inches or a foot says there's some
multipath going on. And sometimes the receivers just get confused and
need a power-cycle. I have some SyncPipes on 1-foot stand-offs with
another 300' of tower above them and rain will make them see no sats.
What has worked better for me than anything else is a SyncInjector and
pipe/box on the ground away from tower steel and lots of RF. Even then,
those get confused sometimes too. Usually when I see really bad fading
at night during the summer, I'll see that tracked sats will go from the
normal 9-12 down to 5-7, but they rarely lose lock.
Once upon a time, I had a SyncInjector and a pipe running in the server
room for 4-5 days (because I forgot to run a cable outside for the
pipe). It worked fine... until it rained.
On 7/26/2017 1:31 PM, Nate Burke wrote:
When we first started using EPMP, (5ghz, with GPS) we had some AP's
would keep losing satellites. Then after our first couple installs,
everything just Worked after that. Slap the GPS antenna on any random
surface, and lots-o-satellites with no issues. Now the New AP's we're
getting out of Distribution have the GLONASS label on the antennas,
and we're back to having hit and miss GPS again at new sites. Are the
new antennas less sensitive? At one location, 1 out of the 4 APs was
going from 12 satellites tracked (20 visible) to 0 Satellites tracked
(still 20 visible) at random times. We moved the GPS Puck about 4
inches vertically, and now it has a steady 17 satellites tracked.
Has something changed with the Antennas?
