Propagation Of Electromagnetic Waves
Chapter Name : Communication Systems |
Sub Topic Code : 101_12_15_06_01 |
Topic Name : Propagation Of Electromagnetic Waves |
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Sub Topic Name : Ground Wave |
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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 Ground 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:
Ground wave propagation is a form of signal propagation where the signal travels over the surface of the ground, and as a result it is used to provide regional coverage on the long and medium wave bands.
What you learn in Practice:
Ground wave radio signal propagation is ideal for relatively short distance propagation on these frequencies during the daytime. Sky-wave ionospheric propagation is not possible during the day because of the attenuation of the signals on these frequencies caused by the D region in the ionosphere.