Here is a photo that I think you will all enjoy:
Starting in the spring of 1963, the Detroit Fire Department began replacing their mechanical "coaster" sirens on all command vehicles. The older electro-mechanical sirens placed a very high current drain on the electrical system of newer automobiles, which were unable to sustain enough power to operate the siren without causing serious problems. Therefore, the apparatus division of the Detroit Fire Department, began ordering the new Federal Interceptor electronic siren controls, which not only allowed for audible warning capabilities, but allowed the external speaker to be used for public address and retransmission of radio traffic.
To the left of the siren control, is a control head for an older General Electric Progress Line two-way radio. This was when the Detroit Fire Department used 154.400 MHz, for all command and tactical operations. After the riots of 1967, the department received several federal grants which allowed them to completely upgrade their two-way radio system. The single channel mobile radios (pictured) were replaced with modern four-channel units.
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Wire photo taken by the Detroit News staff photographer Lawrence, on June 13, 1963. Shot at the Detroit Fire Department's main headquarters on North Macomb Street.