This unit came into use in the early 1970’s and was normally found in hospitals and dispatch centers. It would be “tied” into the transmitter that was usually in another location, often miles away by use of telephone lines. Each base station would have it’s own (usually 3 digit) access number that when activated, would set off a tone at that base station to alert the staff at that particular facility that they had an incoming radio report or message. Ambulance’s where also equipped with 2-way radio’s that also had an Encoder for accessing the hospitals to provide patient reports via radio.
Back in the early 1970’s, the FCC established the frequency 155.340Mhz as the National HEARS (Hospital Emergency Alert Radio System) channel. This was one of the first “attempts” to establish a nation wide communications system to enable ambulance’s from any part of the country to communicate with other ambulances and hospitals/agencies. However, many states and regions found that the HEARS system was not suitable for their area due to either the frequency range and terrain or the cost involved to implement it.
Keywords: Radio, Base Station, MOtorola
Last Revision Date: 5/19/11 - 6:02 PM