It's a good catch -I am not ready to call this a new catch but yesterday and today the ems has been dispatch on Blythe Ca Amb Dispatch. (463.2000) La Paz Fire is still on 154.400. I hear 33 units on that channel today.
461.150 is DCS 174 from what it sound like is that this freq is for the units up in Parker and the blythe ambulance freq is also dispatch for quartside. that is the way i am hearing it i think.It's a good catch -
Blythe Ambulance should be dispatched by River Medical, the EMS provider for La Paz and parts of Mohave County. They have a UHF system but in La Paz use the FD's system as well.
Can you confirm a CTCSS or DCS tone?