Radio Waves Outside of Radio Broadcast Laurence Day

P1125392X

CONTENTS 1. COVER PAGE

2. CONTENTS

3. ELECTROMAGNETIC EXPLAINATION OF RADIO WAVES

4. WIFI

5. PROPERTIES OF WIFI

6. MRI (magnetic resonance imagining)

7. RADAR

8. CELL PHONES AND WALKIES

9. THE END THOUGHT

10.BIBLIOGRAPHY

ELECTROMAGNETIC EXPLAINATION OF RADIO WAVES

Radio waves as you can see in the diagram below are the longest in wavelength and lowest in level of frequency (waves per second) this is shown from the curvature on the diagram

Radio waves have managed to give visuals, audio and text based communication. These sources of communication have a range of 20KHz to 100GHz with mediums such as TV being further up the spectrum and AM Radio at the lower end

Wifi transmits at a frequency of 2.4 or 5 GHz (gigahertz) which is way higher than most radio broadcasters such as TV, Mobile Phones and Walkie Talkies for example. The higher frequency results in more information to be carried across and received.

Wifi allows multiple wireless devices to run through 1 router which is connected to your computer usually through your house phone connection. WiFi is similar to Radio and TV when carrying information, it uses binary in 1’s and 0’s which is then received visa versa and then decoded. Standard Wireless Routers in homes have an average coverage of 30 meters in all directions.

For example, in most homes only one main computer is plugged into the router and uses something called a Ethernet cable to get the wireless service. This allows several devices such as; laptops, mobile phones and other portable devices with the same capability to use the same connection without any cables attached, hence wireless connection. This in conclusion is cost effective for users as they need only 1 transmitter instead of many and allowing for greater productivity also as you can move from room to room without disconnecting, also travellers who often use laptops on trains take advantage of the capability to get work done on the move.

PROPERTIES OF WIFIAlthough great most of the time, the downside to this multiple source of connectivity is that if many people try to use high bandwidth applications at the same time the connection can suffer levels of interference in terms of performance. Ultimately you can lose connection altogether for a period of time if too many people are actively using it. Which in turn makes people angry as hell when a 30 second video clip takes 5 minutes to load.

MRI (magnetic resonance imaging)

MRI machine are often used to explore the human infrastructure. This is achieved by using magnets and radio waves that specifically pick up hydrogen molecules alone. The waves travel through the human body and set off reactions within cells that give off radio signals.

RADAR

THE PROCESS OF RADAR

For example, a radar gun used by police is simply a radio transmitter and receiver. An amplifier is used to then intensify the signal which is then sent out through an antenna. The waves then bounce back (at the speed of light ) to the receiver which is channelled through the antenna then converted back to an electrical current . Radar in its simplest form is used to detect the distance of objects by using concentrating radio waves and waiting for an echo to reflect back. Thetime of the returning echo calculates the distance.

USES OF RADAR

• Detecting planes on ground & air to guide landings.• Police use it to monitor speed • Space operations, tracking satellites and debris. • Aiding the military in locating the enemy, land & sea.• Tracking wind pressure, hurricanes etc.• Even entering supermarkets through automatic doors.

Use of radar on speeding car

CELL PHONES & WALKIES The cellular telephone system is a great system that divides a city into sections of cells. This division of cells allows multiple reuse of extensivefrequencies which in turn allows millions of cell users to operate phones Simultaneously.

A cell phone system operates on a full-duplex radio system which transmits 2 different frequencies so the communication can take place and make a 2 way conversation. Each cell is usually on average 110 square miles in all directions. The cellular approach means phone convo’s can have an incredible range and allow people to be hundreds of miles apart and keep the connection compared to a walkie talkie for example that can only receive from a mile or 2 at the longest. Walkie Talkie work on a half – duplex system..This means only 1 channel can be used but with many users on 1 frequency. This means like we know, that only1 person can talk at a time. Although cellular phones have the advantage of shifting its frequency and cell to get great coverage, thick walls or surfaces like bridges etc still can lead to connection failure. This is something walkie talkies can do without fail.

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