Chapter 3 - Communications

Communications is an extremely important aspect of surveillance and the various methods of communicating covertly by radio are covered. The different types of radio systems; covert microphones, earpieces and wires are explained together with different types of radio voice procedure and code systems.

  • Types of communication equipment
  • Mobile and handheld radios
  • Antennas & frequencies
  • Covert systems
  • Radio security
  • Brevity code systems
  • Radio call signs and networks
  • Voice procedure
  • Spot Codes
  • Encryption
  • The click system