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Telecommunications
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Slide 1

Telecom

Telecom

Slide 2

TELECOM

TELECOM

SPEED OF SOUND WAVES

340 m/s in air

Slide 3

TELECOM

TELECOM

EQUATIONS

v= f l v = d /t

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TELECOM

TELECOM

Frequency = the number of waves per second

Measured in Hertz (HZ)

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TELECOM

TELECOM

CARRIER WAVE THIS TELLS YOU THE RADIO STATION

AUDIO WAVE TELLS YOU WHAT IS ON THE STATION

Slide 6

TELECOM

TELECOM

AMPLITUDE MODULATED (AM) WAVE A COMBINATION OF THE CARRIER AND AUDIO WAVE

Slide 7

TELECOM

TELECOM

PARTS OF THE RADIO

1. AERIAL - PICKS UP ALL SIGNALS

2. TUNER SELECTS ONE PARTICULAR SIGNAL

Slide 8

TELECOM

TELECOM

3. DECODER SEPARATES CARRIER WAVE FROM AUDIO WAVE

4. AMPLIFIER MAKES BIGGER COPY OF AUDIO WAVE

Slide 9

TELECOM

TELECOM

5. BATTERY SUPPLIES ENERGY TO AMPLIFIER

6. LOUDSPEAKER CHANGES ELECTRICAL ENERGY TO SOUND ENERGY

Slide 10

TELECOM

TELECOM

COLOUR MIXING

3 PRIMARY COLOURS RED , GREEN , BLUE TOGETHER MAKE WHITE

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TELECOM

TELECOM

RED AND GREEN GIVE YELLOW.

RED AND BLUE GIVE MAGENTA

GREEN AND BLUE GIVE CYAN

Slide 12

TELECOM

TELECOM

GEOSTATIONARY SATELLITES ARE AT A HEIGHT OF 36 , 000Km ABOVE THE EARTH

THEY HAVE A 24 HR ORBIT

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TELECOM

TELECOM

SIGNALS ARE MICROWAVE AND TRAVEL IN A STRAIGHT LINE TO AND FROM THE SATELLITE.THEY CANNOT CURVE IN THE EARTH`S ATMOSPHERE

Slide 14

TELECOM

TELECOM

OPTICAL FIBRES USED TO CARRY INFORMATION BY TOTAL INTERNAL REFLECTION. LIGHT TRAVELS AT A SPEED OF 200 , 000 , 000 M/S

Slide 15

Electricity

Electricity

EQUATIONS

Q = I x T V = I x R

P = I x V P = E / t

P = V2 / R P = I2R

RT = R1 + R2

1 /RT = 1/R1 + 1/R2

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