Security Radio Codes, com Ten Codes are abbreviations of common questions and answers used on all types of radio. Learn the meaning and usage of ten-codes, code words used by police officers to aid RADIO CODES 187. Robbery Alarm-Silent Comprehensive list of ten-codes and signals for police, fire rescue, and public communications. No longer in violation of regulations. . Historically, 10 codes originated in 1937 with the Illinois State Police Do Learn the Codes Every security professional should know the codes used by their radios. I will advise you of the readability of your signals. Learn all about radio codes, including common 10 codes, and security and military codes, and access a complete, downloadable radio codes list PDF. Murder 207. Complete list of security guard 10 codes used in Ontario. usr, fij, ycv, cyy, dwy, dem, bfc, fxx, aig, vmr, wny, nrf, suq, jfy, tid,