Managing Communications At Incidents - Communication Theory

Question 1

Simplex channels operate by direct communication between radios on the same frequency. Only one person can talk at a time. What channel number are used as simplex channels?

Answer 1

9, 11, 12, 14, 15, 16 and 19

Question 2

What piece of equipment can boost and strengthen radio signals?

Answer 2

Repeater. Duplex transmissionz utilise repeaters which retransmit the incoming transmission which can increase the coverage

Question 3

When can using a duplex channel with a repeater be helpful?

Answer 3

When you are spread out over a large area or in situations when you are dealing with obstacles like thick walls, multiple floors or basements

Question 4

The Received Signal Strength Indicator (RSSI) on the tait radios can be used to assess signal strength. What do the figures mean?

Answer 4

More than - 70 excellent
- 70-85 good
- 86-100 fair
Less than -100 pool
-110 no signal

Question 5

The RSSI value starts at 0 for a very strong signal. What do negative numbers indicate?

Answer 5

Signal strength is deteriorating

Question 6

Radio strength is impacted by three key areas, what are they?

Answer 6

Obstacles - thick walls
Interference - electronic machinery
Environment - weather, water and buildings

Question 7

The cu uses several radios to monitor different channels and speak to other agencies. When i. The cu what should you do with radio?

Answer 7

Monitor the installed incident ground radio it is less susceptible to interference. Move away from the cu to send messages on incident ground radio or ask the cu operative to send the messages on incident using the fixed radio.