Propagation Of Electromagnetic Waves
Chapter Name : Communication Systems |
Sub Topic Code : 101_12_15_06_02 |
Topic Name : Propagation Of Electromagnetic Waves |
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Sub Topic Name : Sky Waves |
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Introduction
A communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole.
Pre-Requisites:
Communications system
Activity:
Radio.
Real Life Question:
What is Sky wave?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Bandwidth | Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Broadcasting | Broadcasting is the distribution of audio and video content to a dispersed audience via any audio or visual mass communications medium, but usually one using electromagnetic radiation (radio waves). |
Real life uses :
Communication.
Places to visit :
Radio station.
Practical examples around us
| Examples | Explainations |
|---|---|
| Radio communication system | A radio communication system is composed of several communications subsystems that give exterior communications capabilities. |
What you learn in Theory:
Sky wave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.
What you learn in Practice:
Sky wave propagation can be used to communicate beyond the horizon, at intercontinental distances. It is mostly used in the shortwave frequency bands.