This sound is heard during the bootup of the radio right before displaying the current channel.

This tone is used to indicate to the user that they are clear to talk on an unencrypted channel. It can be programmed for both analog and digital modes on conventional and trunked systems. In analog mode or digital simplex the tone serves no practical use other than being a byproduct of pressing PTT but on digital repeaters or trunked systems it indicates that the radio has authenticated with the repeater / trunked system controller and you are free to talk on the system.

This tone is used to indicate to the user that they are clear to talk on an encrypted channel. It can be programmed for digital modes on conventional simplex, conventional repeaters, and trunked systems. On digital simplex the tone serves no practical use other than being a byproduct of pressing PTT but on digital repeaters or trunked systems it indicates that the radio has authenticated with the repeater / trunked system controller and you are free to talk on the system.

This is what MDC-1200 sounds like when listened to in a raw transmission. MDC-1200 sends a 4 digit ID number over the air at the start, end, or both the start and end of a transmission. This specific ID burst contains the ID "0612"

This is an example of what a Quick-Call 2 broadcast can sound like. Quick-Call 2 uses 2 different tones as a paging system typically in public safety radio systems. This specific audio has the tones 389.0 Hz and 410.0 Hz.

This is an example of what a DTMF radio ID can sound like. DTMF is the same tone technology used on telephones to dial phone numbers. This specific audio has the numbers "0612".