Radio Terminology

Encryption – Methodology that encodes a voice or data message to protect its content from unauthorized reception. (In the) Clear – Unencrypted radio transmissions that can be heard by all persons who can monitor the frequency, including those with radio scanners and smartphone apps. Hailing Channel (aka Calling Channel) – Channels designated for the purpose of making initial contact when approaching or arriving at an event. May or may not be monitored by dispatchers or other personnel. Keyloader – Device which physically connects to a radio to allow the manual downloading of encryption keys. Over-the-Air-Rekeying (OTAR) – Method to transmit encryption keys over the radio system. Encryption keys are received by the radio, and (normally) automatically updated. Push-To-Talk (PTT) – Refers to the microphone button which is pushed to transmit and released to receive transmissions. Soft Key – Buttons on a radio controlling various functions programmed into the radio. Often found directly adjacent to the display denoting the button’s function. Strapped – Encryption is permanently attached to a channel and is always on, cannot be controlled by the user.