AMR Maricopa, aka AMR Central Arizona is the original AMR. After AMR bought Rural/Metro, Southwest became AMR, PMT became LifeLine Ambulance. LifeLine Ambulance belongs to AMR. AMR Maricopa uses the CCS for IFT only now. AMR Maricopa in QC/Gilbert 911 switched to Ch. 15 on the UHF system recently, Gila Bend 911 (temp assignment) uses Ch. 18 UHF. The UHF system is still used by the old SWA/PMT crews. The VHF system is alive, but not used as far as I know. AMR IFT may switch to the UHF System (Ch. 20) also, maybe. 911 Units East of 51 use Ch. 15, West of 51 use Ch. 16, all IFT Units use Ch. 20. All 911 Units also use the RWC and TRWC System, all AMR Maricopa Units are equipped with Motorola 7/800Mhz/VHF P25 Mobiles. As far as Scottsdale, AMR refused to take their Paramedics off the trucks, so Maricopa Ambulance won the bid. All the ambulances are now BLS, they also pay Scottsdale something like $2 million a year for the contract. Surprise 911 is still AMR/SW as far as I saw at the Peoria Main Station last week. Sorry if this is all over the place.