What are folks seeing with regard to distance and throughput with the SR9 900MHZ? Will these go 5-6 miles through a few trees (a few trees about mid way and a few more around the clients house)?
AP:SR9 in RB532 w/ 13 dbi 90 degree sector @ 110’ EIRP 36 dbm
CPE: SR9 in RB112 w/ 13 dbi yagi @ 8’ EIRP 36 dbm
Distance: 11.3 miles NLOS
Download to site on internet: 1.34 Mbps
Upload to site on internet: 800 Kbps
This is over a single T-1, so the SR9 link almost maxed out my T-1 @ 11.3 miles sitting right next to an operational Motorola Canopy 900 Mhz system. I was checking to see if the operational Canopy 900 Mhz system would cause interference on my 900 link.
At just about any location inside 8 miles, I could max out the T-1 on uploads and downloads. I was really impressed with the performance. 
Thanks for the info. How many trees, obstructions, etc did you have between the AP and the client? That sounds pretty promising. 
Northeast Texas. The pineywoods region. Lots of pine trees and live oaks.
Pretty flat elevations, right?
We have alot of rolling hills and some 200’ to 300’ elevation changes. The direction that I did this test in was across a river bottom so the elevation was fairly flat, but still impressive.
What was your signal strength and what channel size where you using 5/10/20 ?
Erik
Signal strength was -81 on 5 mhz channel spacing.
We’re seeing results very similar to slipstream1’s. However that news about coexisting w/Canopy is very good to hear; we don’t have the problem in our area.
Can any of you guys tell me what through put you are getting at the different modulations, and have you tried the 10mhz channel at all? and if so what did you see for through put.
Erik
For right now the best information on the effect of rates, bandwidth are probably the following writeups by Ubiquiti.
Point-to-point:
http://www.ubnt.com/downloads/SR9_Mtik_PtP.pdf
and point to multipoint:
http://www.ubnt.com/downloads/SR9_Mtik_PMP.pdf
Our own experience closely matches the data therein.
I am just going to use the 5 mhz channels for now. If I expand later on, I may include some 10 mhz channels. I noticed that with one card on 5 mhz channels and 1 card on 10 mhz channels, the cards don’t see each other. I guess they will add a little more noise but maybe not add significant interference to wach other.
They refer to antenna/cable mismatch keeping within 1.5:1
How does one calculate this?
You need a meter. For 900mhz only M2 makes a great little unit that will test your antenna and cable system any where on the 900mhz band. They also make great 14 and 17dbi yagi antennas. http://www.m2inc.com/main%20html/900acctemp.html
Erik
There isn’t a way to calculate based on what specs the Antenna and cable have?
Slipstream,
What antennas were you using? Can you share your hardware configuration as I’m not saying anywhere near that kind of performance.
Thanks!
No, its a factor of the quality of the antenna design (decent design has low reflected power even over the relatively wide bandwidths required for this application), the quality of your connector workmanship (properly assembled connectors do not cause reflected power), and the assumption that the impedance of your antenna and cable are correct for the transceiver (a given if you’re buying from Wifi vendors).
Humm, Is there something different about the way the Moto 900 APs work then the 2.4 Moto. I only ask because a friend of mine was trying to add Moto 2.4 equipment to his Mikrotik network and as soon as he powers up the Canopy AP his MT APs just stop working. Even if they are on ch1(MT) and ch11(Moto). The Moto AP seems to kill the whole 2.4Ghz band.
jcwn:
I am using some DB Products 90 degree 13 dbi sector antennas that are hand-me-downs from a cellular carrier. They have a 40 db F/B ratio and just perform awesome. The CPE side is a 13 dbi Hyperlink yagi. This is a little larger antenna than I would like to use, almost 5’ long, I am planning to use a 9 or 10 dbi yagi, less than 3’ long, in future installations. The configuration on the RB’s are plain jane most config set to default.
jober:
I was testing around a competitors Moto 900 mhz system to determine if there would be any interference on the Mikrotik/Ubiquiti setup that I plan on using, before i spent the moolah for a large scale deployment. I could see no substantial interference.
Let me also state that I turned the power down to stay within FCC EIRP guidelines for 900 mhz, 36 dbm AP and Client side.
I do not see why we cannot get the ranges that the cellular carriers are getting, maybe even more. Yes, they can use higher power at the base station, but those little phones can only muster 100 mW or so max.