Radio Communications and Procedures Flashcards

What does P25 (Project 25) refer to in the context of public safety radio?

Answer: A suite of digital radio standards developed for North American public safety agencies

P25 is a set of digital radio standards developed by APCO and the federal government for interoperable public safety communications.

A unit advises they are 'out of service, mechanical.' How should the dispatcher log and handle this?

Answer: Update the unit's status in CAD as out of service and notify the supervisor

Out-of-service units must be accurately reflected in CAD and supervisors notified to maintain situational awareness.

Which radio communication practice helps prevent 'stepping on' another unit's transmission?

Answer: Listening before transmitting to ensure the channel is clear

Monitoring the channel before transmitting prevents two units from broadcasting at the same time and blocking each other.

In radio communications, what does 'affirmative' mean?

Answer: Yes / Confirmed

'Affirmative' is the standard radio term meaning yes or confirmed, preferred over simply saying 'yes'.

A dispatcher is instructed to use a 'simplex' channel for a special event. This means the channel:

Answer: Allows direct radio-to-radio communication on a single frequency without a repeater

Simplex channels use a single frequency for direct communication without repeater infrastructure.

Which situation would most justify activating a radio 'emergency button' by a field unit?

Answer: An officer is in immediate physical danger and needs urgent backup

The emergency button is intended for life-threatening situations requiring immediate response from dispatch and other units.

What is the role of a 'repeater' in a public safety radio system?

Answer: To receive a weak signal and retransmit it at higher power to extend coverage area

A repeater receives portable radio transmissions and rebroadcasts them at higher power, greatly extending communication range.