I have a new pop setup with a RB512 and a single SR9 card into an 8 dbi Omni. I am running the latest code on the base and the clients. The clients will never stay connected. When I first hooked up the first client he would stay connected for an average of 15 minutes and reconnect. When the second client came on, the link between both now rarely stay connected for 30 seconds. The SNR of the links flucutate from 24dB to number in the negative. What it look like is the output from the base station is fluctuating by 20-30 db not the client units though. This is also the signal levels fluctating not the noise floor. I have tried to lock down the levels to a tx/rx of 6 but this doesnt help either. I have this unit on a poe run of about 10 feet of cat5 with a 18v PS. Could the flucuations be a to much drain on the power supply? Bad SR9 card? Omni is fine, I took this from a working install. No LMR in the mix to be bad either. We are running on 5mhz channels as well if that helps any. Noise floor is reporting an -82.
?? When I try to set it manually to the full 28 and check the current power outs, its states all 0’s for all speeds. Could this be part of the problem MT is not dishing out the power of the card correctly?
I llike your idea of changing the 18v power supply to 48v. The SR9s do using more power, but not as much as the SR2/SR5.
Also, we have our two SR9 APs running at default and we’re getting just about a perfect match for the theoretical calculations providing we’re not “tree-busting” on the link.
What I can tell you for sure is that MT does NOT see all the noise in the area when using an SR9.
Check REDTDI’s post in another thread about having a Trango 900 client 30’ away. We really didn’t see all the noise the Trango was making reflecting in an increased noise floor on the MT.
We are also seeing an interaction where interference IS showing as a reduction in RSSI, exactly the effect you describe.
As you already know, omnis can be dangerous in 900 because of noise issues.
It looks like in the short term we are going to do noise surveys with a Trango 900 SU acting as a spectrum analyzer. Hopefully Ubiquiti will address the site survey implications at some point in the future so we can get an accurate noise assessment from the MT.