"The Wider and Broader Information Road" Information Transmission PPT Courseware 5

Description

"The Wider and Broader Information Road" Information Transmission PPT Courseware 5

For the same news, compared with sound broadcasting or television broadcasting, which one transmits more information in the same time?

Theory shows that the higher the frequency of radio waves as a carrier, the more information can be transmitted in the same time.

1. Microwave communication

(1) What is the wavelength and frequency range of microwaves?

(2) Why use microwave communication? What are the advantages of microwave communication?

(3) What are the applications of microwave communication?

(4) What are the disadvantages of microwave communication?

(5) Why is it necessary to establish a microwave relay station and what role does it play?

(6) Can the moon serve as a relay station and why?

Properties of microwaves:

Wavelength: between 1mm～10m;

Frequency: between 30MHz～3×105MHz

Advantages: Large communication volume; one microwave line can open thousands or tens of thousands of calls at the same time.

Disadvantages: The farther the signal is transmitted, the more relay stations are needed due to signal degradation and time delay. And when encountering mountains and seas, it is impossible to build relay stations.

Propagation path: close to light waves and cannot be diffracted along the earth's surface. Microwave relay stations must be relied upon to transmit information.

Self-learning

1. What is the role of satellites?

2. If people all over the world can see a certain scene immediately, how many satellites are needed as relay stations?

3. Of the many TV programs you watch at home, which ones are delivered via satellite?

geostationary communications satellite

Geostationary satellites are also called geostationary satellites, which means they are stationary relative to a certain point on the ground. The period of revolution is the same as the period of Earth's rotation, both are 24 hours.

2. Optical fiber

1. Why use optical fiber communication?

2. Why does fiber optic communication use laser?

3. What is the principle of optical fiber communication?

4. What are the advantages of fiber optic communications?

5. What is the process of optical fiber communication?

In 1960, American scientist Maiman made the world's first ruby ​​laser, which could produce laser light of a single frequency and highly concentrated direction, making the idea of ​​using light for communication possible.

Light enters from one end of the optical fiber, is totally reflected multiple times on the inner wall of the optical fiber, and emerges from the other end, thus transmitting the information it carries to a distant place.

Keywords: information transfer teaching courseware, ever wider information road teaching courseware, NEP version ninth grade physics PPT courseware, ninth grade physics slide courseware download, information transfer PPT courseware download, more and more The Wider Road to Information PPT courseware download, .ppt format

For more information about the PPT courseware "The transmission of information, the road to information is getting wider and wider", please click the "The transmission of information, the road to information is getting wider and wider" ppt tag.

"The Wider and Broader Information Road" Information Transmission PPT Courseware 6:

"The Broader and Wider Information Road" Information Transmission PPT Courseware 6 Learning Objectives 1. Understand satellite communication 2. Understand optical fiber communication 3. Understand network communication The same piece of news, sound broadcast and TV broadcast are compared at the same time Which one transmits the most information? Reason...

"The Wider and Broader Information Road" Information Transmission PPT Courseware 4:

"The Broader and Wider Information Road" Information Transmission PPT Courseware 4 1. Microwave Communication Learning Objectives: 1. Why use microwave communication? What are the advantages of microwave communication? Information theory shows: As a carrier of electromagnetic waves, the higher the _____, the ___ transmitted in the same time..

"The Broader and Wider Information Road" Information Transmission PPT Courseware 3:

"The Wider and Broader Information Road" Information Transmission PPT Courseware 3 Information theory shows that the higher the frequency of electromagnetic waves as carriers, the more information can be transmitted in the same time. Subject Network 1. Microwave Communication The wavelength of microwave signals is between 10 m and 1 mm; microwave signals...

File Info

Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

Preview