The silence was due to the encryption of the main radio frequency used by the Peoria Police Department, known as Prep 1. And what that means is that those who like to listen to Peoria police radio ...

[Harrison Sand] just finished a guide on how to use SDR to listen in on Police and Fire radio bands. The project, which results in the crystal clear audio reception heard after the break ...

Encrypting makes the radio traffic understandable only by specially equipped police radios. For everyone else, the police frequencies are now silent. Other police departments in the area are now ...