Landmarks in public safety radios
AM bases - 1920s
FM - ?
backpack radios - ? 1935
repeaters - 1939 ?
lunch box size portables - ? 1945
1950s - paging systems
1955 ? - earliest interops channels 153.83 46.30 154.265 154.28
154.295 155.34 155.475
1960s - transistors brought multi channels and hand held portables and UHF
1980s - trunked systems and data terminals
1990s - cellphones
1995 ? - P25
2000 - ( ? faster paging systems ? ) & vtacs / utacs / itacs
2005 ? - cheaper satellite phones
2006 ? - GPS makes travel routing much much easier - ? but very few
public safety use it ?
2013 - narrowbanding of VHF & UHF provides 100% more channels
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