Then it was Nextel installing high power, noisy transmitters that really finally screwed up 800 mhz.
They admitted to this? Cite?
iDEN runs equipment made by the same people making it for the public safety agencies (i.e., Motorola). If the equipment was at fault I wonder why it's still being used? Probably because it worked correctly all the time.
Since the Nextel network was setup to serve a large amount of capacity you have to go to a topology where there are more sites at lower elevations with shorter propagation areas. This is versus a Public Safety trunked system that is on top of a mountain far away. With the FCC allowing Nextel to be mixed with PS they ignored the fact that a Nextel site, operating as it should, would desense a PS radio attempting to receive a signal coming from 50+ miles away. No voodoo magic here.
You know how much power comes out of a shelter at the surge suppressor? About 5-8W for a single channel radio and around 15-20W for a "Quad" channel radio. Then there's the loss in the coax. Antennas with around 10-20 dB gain you would on average have 50-70W ERP and possibly 150-160W for a Quad. Not 300, not 500, not even 1000W.
Nextel should have never been allowed to intermix with public safety frequencies. The FCC should have known better.