This is a group of 3 PrismStations up for testing, with an additional IsoStationAC - more on that later. This actual group of radios in this configuration will be going up at a local public venue soon - a raceway where they get over 10,000 people on site on busy weekends. It's a major relay and broadcast site for us, and we also use it for testing out things.
The PrismStations (the 3 upper units on the pole) each have a different horn attached - the 60 degree sector, the 45 degree horn and the 30 degrtee horn (top down). The IsoStation AC has the 90 degree horn on it.
But what I want to talk about here today is the adjacent channel interference filtering capability of the Prism chip system. The 4 radios are all running as APs, the PrismStations all GPS sync'd together. The PrismStations are all running 20MHz channels in UNII-3. Here is an AirView from the IsoStation and you can see the three channels in use above 5700MHz
Look at the bottom histogram - you can clearly see the three channels in red. But see what happens with the PrismStations -
The channels are almost gone! This is from the one with the 45 degree horn (which comes with the PrismStation). Here's the one with the 30 degree horn
These radios are all so close to each other that the effect of the individual horn patterns really doesn't make much difference - they are all in each other's "near field" range - and the power levels on Tx are all the same. So what we're seeing here is due to the difference in the Prisn chip. Pretty remarkable.
Finally here is the PrismStation with the 90 60 degree sector - note that here we do see even greater isolation because it's pointed 180 degrees away from the others. It's also not picking up much from a bunch of other radios behind it - I've got a lot of stuff up for testing at any given time...
Bottom line? Everything Robert and others are saying about the benefits of the PrismStation is real. We're planning to use them everywhere we can - we've already been converting a lot of our older APs with RocketM radios to Rocket-AC Prisms, and this will just accelerate that process.
" How can anyone trust Scientists? If new evidence comes along, they change their minds! " Politician's joke (sort of...)
"Humans are allergic to change..They love to say, ‘We’ve always done it this way.’ I try to fight that. "Admiral Grace Hopper, USN, Computer Scientist