CED Radio & Telecommunication Systems 3

Question 1

A dispatcher hears two units transmitting at the same time, causing an unintelligible noise. This is called:

Accepted Answer

Doubling or kerchunking

Answer

When two units transmit simultaneously on the same frequency, the overlapping signals create noise called 'doubling,' making neither transmission intelligible.

Question 2

What is the function of the squelch control on a radio?

Accepted Answer

To suppress background noise when no signal is being received

Answer

Squelch mutes the receiver's audio output when signal strength falls below a set threshold, eliminating static noise between transmissions.

Question 3

During a major incident, the Incident Commander requests a dedicated radio channel for command communications. The dispatcher should:

Accepted Answer

Assign an existing talk group or channel per agency protocol and notify all affected units

Answer

Dispatchers should follow agency protocol to assign a dedicated channel or talk group and notify all units of the change to maintain organized command communications.

Question 4

What is the primary advantage of P25 (Project 25) digital radio standards in public safety?

Accepted Answer

Standardized interoperability between different manufacturers' equipment

Answer

P25 establishes common technical standards so that public safety radios from different manufacturers can communicate with each other.

Question 5

A unit transmits 'Signal 9' and then goes silent. If 'Signal 9' means officer needs assistance, the dispatcher should FIRST:

Accepted Answer

Immediately broadcast on the channel for the unit to confirm their status and location

Answer

When a distress signal is received, the dispatcher must immediately broadcast to confirm unit status and location to initiate appropriate response.

(CED) Certified Emergency Dispatcher Practice Test

(CED) Certified Emergency Dispatcher Practice Test

CED Radio & Telecommunication Systems 3