FSK only needs 3db above the noise floor to modulate at 1x. It needs 10db to modulate at 2x
The 450 and epmp need at least 10db to hold a connection at the lowest modulations. To get the high modulations out of those products you need 25db or more. So if your noise floor is -60 for FSK you need a -57 for 1x or -50 for 2x For the other products you'll need -50 for the lowest modulations and a -35 or better for the highest modulations. As you can see FSK will always be the best platform in the face of interference. The others work but don't expect miracles because 25db SNR in a noisy environment just isn't realistic. YMMV Pick a band with clean spectrum (ie 5.4, 5.1, 3.65 etc) -sean On Wednesday, April 22, 2015, Matt <[email protected]> wrote: > > Not in our experience...we have not had great success migrating from FSK > 100 series to ePMP. Noise floor SNR sucks. > > Have you tried migrating from 2.4 FSK too 2.4 450 at a very noisy > site? Have a site I need more capacity at and frequency options are > limited. > > >> Hey guys, > >> > >> We're on a tower with a basically dead WISP that has 3 sectors of > 2.4ghz up there. It's 10 year old equipment so not even sure what brand. > Anyway, we placed 4 sectors of Ubiquiti 2.4 gear on 10 MHz channels with RF > Armor on all sectors. We found that channels 1 and 11 were best so we did > channel 1 on North and south sector and channel 11 on east and west so > they're back to back. The back to back sectors are separated by a solid > water tank/tower but they still see each other at -55 which is hotter than > I thought they would be with Armor and the water tank. > >> > >> Anyway, we don't get the best of performance due to self interference > as well as interference from the old WISP equipment. In your experience > with ePMP, would we see a noticeable improvement going to ePMP 2.4 gear and > syncing it all for channel reuse on the back to back sectors? Would this > also give us the added benefit that we would reduce adjacent channel > interference with ourselves because all sectors would transmit and receive > with each other? > >> > >> Thank you >
