Communication Systems

Question 1

Communications System ATA Chapter

Answer 1

ATA 23

Question 2

connects the flight deck to the ground and the flight deck to the passengers

Answer 2

communications system

Question 3

a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite

Answer 3

communications system

Question 4

manufactured the radio transmitter and receiver first installed in an aircraft in 1909

Answer 4

Marconi Company

Question 5

The VHF aviation communication system works on the air band of _ MHz to _ MHz.

Answer 5

108.00; 136.975

Question 6

used for voice transmission and reception between aircraft and aircraft or ground station

Answer 6

communications system

Question 7

involves transmission and reception of electromagnetic energy waves through space

Answer 7

radio communication

Question 8

creates an EMF around the conductor as it passes through the conductor

Answer 8

alternating current

Question 9

a conductor which radiates EMF-stored energy into space in the form of electromagnetic waves

Answer 9

transmitting antenna

Question 10

rate at which the transmitted radio waves by the transmitting antenna travel

Answer 10

186000 mi/s

Question 11

Frequencies between _ MHz to _ MHz are split into 200 narrow band channels and they are used for VOR, automatic terminal information service, ILS, and local area augmentation system.

Answer 11

108; 117.975

Question 12

Frequencies between _ MHz to _ MHz are split into 760 channels and they are used for AM voice transmission.

Answer 12

118; 137

Question 13

Some channels between _ MHz to _ MHz are available for government agencies, search and rescue and national aviation authority use.

Answer 13

123.100; 135.950

Question 14

frequency range used for aircraft communication for transoceanic flights or spacecraft communication

Answer 14

high frequency

Question 15

the number of occurrences of a repeating event per unit time

Answer 15

frequency

Question 16

basic components of a communication system

Answer 16

• microphone
• transmitter
• transmitting antenna
• receiving antenna
• receiver
• power supply

Question 17

converts the sound energy into corresponding electrical energy

Answer 17

microphone

Question 18

generates radio frequency signal

Answer 18

oscillator

Question 19

increases the output

Answer 19

amplifier

Question 20

adds the voice signal

Answer 20

modulator

Question 21

special type of electrical circuit

Answer 21

transmitting antenna

Question 22

must be able to select the desired frequency signal from lots of signals present in the air and amplify the small AC signal voltage

Answer 22

receiver

Question 23

removes the added signal

Answer 23

demodulator

Question 24

demodulator component used for AM

Answer 24

detector

Question 25

demodulator component used for FM

Answer 25

discriminator

Question 26

a digital datalink system for transmission of short, relatively simple messages between aircraft and ground stations via radio or satellite

Answer 26

aircraft communications and addressing reporting system (ACARS)

Question 27

designed the ACARS protocol in 1978

Answer 27

Aeronautical Radio, Incorporated (ARINC)

Question 28

frequency range for long-range communication

Answer 28

HF (2-30 MHz)

Question 29

frequency range for near to medium-range communication

Answer 29

VHF (30-100 MHz)

Question 30

frequency range for military aircraft

Answer 30

UHF (250-400 MHz)

Question 31

the simplest and earliest form of communication

Answer 31

amplitude modulation (AM)

Question 32

is used to transmit the information via a radio carrier

Answer 32

amplitude modulation (AM)

Question 33

Its application includes broadcasting in medium and high frequency applications, aircraft communications, and CB Radio (citizen's band radio).

Answer 33

amplitude modulation (AM)

Question 34

a communication technique that encodes information onto a carrier wave by varying the carrier's instantaneous frequency in proportion to the instantaneous amplitude of the message signal, which can be audio or another data type

Answer 34

frequency modulation (FM)

Question 35

is used in telecommunications, radio broadcasting, and digital signal processing, offering higher resilience to noise compared to analog modulation (AM)

Answer 35

frequency modulation (FM)

Question 36

the process by which some characteristics of a carrier signal is varied in accordance with message signal

Answer 36

modulation

Question 37

is required to expand the bandwidth of the transmitted signal for better transmission quality

Answer 37

modulation

Question 38

uses the ability of an electromagnetic wave to transfer information from one point to another

Answer 38

radio communication

Question 39

the first method used to transfer voice information from one place to another

Answer 39

analog modulation (AM)

Question 40

Voice frequencies range from _ Hz to _ Hz.

Answer 40

50; 3000

Question 41

In amplitude modulation, _ frequency + _ frequency = _ frequency.

Answer 41

voice; carrier; radio