So yesterday I did some tweaking on the sync parameters and was able to get
better results. I'll put the details in a second post, but I wanted to
update the grim picture I painted the other day.
As initially set up, I was only getting 1X MIMO-A, even on a 5 MHz channel
and after trying a bunch of frequencies, and the SMs would not reliably stay
registered.
After tweaking the sync parameters and channel, I was able to get one sub to
4X MIMO-B and the other to 2X MIMO-B, and increase the channel width to 7
MHz. They have stayed registered now for 18 hours and while the speed
varies a bit they hold 4X and 2X. Here are linktest results I just ran:
subscriber #1
2 miles with a few bare trees and apparently some multipath issues
2X MIMO-B
8.6M down, 4.4M up, 13.0M aggregate
subscriber #2
8 miles with 2 lines of trees and a house in the path
4X MIMO-B
14.6M down, 4.6M up, 19.3M aggregate
The AP and subscriber #1 have bad interference across the band, interference
is not as bad at subscriber #2.
These numbers may not look great compared to 100M aggregate capacity, but
they are around a 6 times improvement over what we had with FSK. I'm sure
we would see better results at another site with less interference, in fact
I have another tower where we can run 2X FSK but 4M aggregate just isn't
enough capacity.
