American police forces had car radio communications from the 1940s, as evidenced by watching films (movies) from the time. Were they Shortwave (HF), SSB, or what? How effective were they? - Quora
![Old Walkie-talkie on red table and blurred background ,communication equipment concept Stock Photo - Alamy Old Walkie-talkie on red table and blurred background ,communication equipment concept Stock Photo - Alamy](https://c8.alamy.com/comp/R0H4JH/old-walkie-talkie-on-red-table-and-blurred-background-communication-equipment-concept-R0H4JH.jpg)
Old Walkie-talkie on red table and blurred background ,communication equipment concept Stock Photo - Alamy
![The History of Police Communications in New York City – Part 3 -Post WWII Two-Way Radio Communications – The History of Policing in the City of New York The History of Police Communications in New York City – Part 3 -Post WWII Two-Way Radio Communications – The History of Policing in the City of New York](https://nypdhistory.com/wp-content/uploads/2017/02/120th-Precinct-Ptl-on-Portable-copy.jpeg)
The History of Police Communications in New York City – Part 3 -Post WWII Two-Way Radio Communications – The History of Policing in the City of New York
![Amazon.com: Forum Novelties Police Walkie Talkie Set, Black, Standard (Non-functioning) : Toys & Games Amazon.com: Forum Novelties Police Walkie Talkie Set, Black, Standard (Non-functioning) : Toys & Games](https://m.media-amazon.com/images/I/51AqmEga5kL.jpg)
Amazon.com: Forum Novelties Police Walkie Talkie Set, Black, Standard (Non-functioning) : Toys & Games
![antique Police radios | Photos above of Salinas, California PoliceUHF MCR-100 (1980's) | Police radio, Emergency radio, Cb radio antique Police radios | Photos above of Salinas, California PoliceUHF MCR-100 (1980's) | Police radio, Emergency radio, Cb radio](https://i.pinimg.com/736x/04/7d/f2/047df2edf24f81fb5d5b1c572e4350d9.jpg)