COMMS

Question 1

The idea of wireless communication predates the discovery of “radio” with experiments in

Answer 1

wireless telegraphy

Question 2

The idea of wireless communication predates the discovery of “radio” with experiments in “wireless telegraphy” via inductive and capacitive induction and transmission through the

Answer 2

• ground
• water
• train tracks

Question 3

The early history of radio is the

Answer 3

history of technology

Question 4

The earlyhistory of radiois thehistory of technologythat produces and uses_______that use________.

Answer 4

• radio instruments
• radio waves

Question 5

He predicted the existence of radio waves

Answer 5

James Clerk Maxwell (1860s)

Question 6

He demonstrated that rapid variations of electric current could be projected into space in the form of radio waves similar to those of light and heat.

Answer 6

Heinrich Rudholph Hertz (1886)

Question 7

He successfully demonstrated “wireless telegraphy.”

Answer 7

Mahlon Loomis (1866)

Question 8

What was the first known instance of wireless aerial communication

Answer 8

meter connected to a kite

Question 9

Proved the feasibility of radio communication. He sent and received his first radio signal in Italy

Answer 9

Guglielmo Marconi (1895)

Question 10

When did Marconi flashed the first wireless signal across the English Channel

Answer 10

1899

Question 11

When Marconi flashed the first wireless signal what letter did he received

Answer 11

“S”

Question 12

The radio came from a series of discoveries and inventions in the

Answer 12

late 1800s and early 1900s

Question 13

The first contributor, the one responsible for opening the door to all radio

Answer 13

Heinrich hertz

Question 14

3 distinct phase of radio

Answer 14

• electromagnetic waves and experimentation
• wireless communication and technical development
• radio broadcasting and commercialisation

Question 15

Brazilian priest transmitted the human voice wirelessly

Answer 15

Landell De Moura

Question 16

When did Landell De Moura conducted his first public experiment

Answer 16

June 3. 1900

Question 17

Where did Landell De Moura conducted his first public experiment and at what distance

Answer 17

• São Paulo, Brazil
• 8 km (5 mi)

Question 18

What is the points of transmission of Landell De Moura experiment

Answer 18

• Alto de santana
• Paulista Avenue

Question 19

term used to refer to the wireless transmission of information from one point to another.

Answer 19

radio

Question 20

first avionics systems installed in airplanes.

Answer 20

communication radios

Question 21

What is the first use of radio

Answer 21

radio broadcast

Question 22

can occur between pilots and between pilots and air traffic controllers

Answer 22

communication error

Question 23

Communication error contains

Answer 23

• Amount of information
• Unclear pronunciation
• Misunderstanding

Question 24

Comprised of all frequenciesof electromagnetic radiation that propagate energy and travel through space in the form of waves.

Answer 24

electromagnetic waves

Question 25

Longer wavelengths have

Answer 25

lower frequencies

Question 26

Shorter wavelengths have

Answer 26

higher frequencies

Question 27

Characteristics of the electromagnetic spectrum

Answer 27

- propagation features - amount of information

Question 28

This signal travels in a continuous wave whose strength and frequency vary directly with a changing physical quantity at the source.

Answer 28

Analog signal

Question 29

This signal converts information to ones and zeros which are formatted and sent as electrical pulses.

Answer 29

Digital Signal

Question 30

Radio spectrum has a frequency of

Answer 30

3 hz - 300 Ghz