1. Intro to Tech - Radio 1 Radio Transmission Moving information from place to place using Electro Magnetic Radiation

2. Intro to Tech - Radio 2 Types of transmission.. l Amplitude Modulation l Frequency Modulation l Phase Modulation l Pulse Code Modulation

3. Intro to Tech - Radio 3 AM Waveforms

4. Intro to Tech - Radio 4 FM Waveforms

5. Intro to Tech - Radio 5 The carrier.... l A high frequency ‘carrier’ takes information from one place to another. l The ‘carrier’ is considered to be a ‘radio frequency’ or RF. l The ‘information’ is attached to the carrier using AM, FM, or PCM or another method.

6. Intro to Tech - Radio 6 The carrier is a Sine Wave

7. Intro to Tech - Radio 7 Carrier velocity = v l The carrier travels at the speed of light l 186,000 miles/second l 300,000,000 meters/second

8. Intro to Tech - Radio 8 Wavelength = v/f F = 1290 KHz ( WNBF Radio ) Λ = v/f = 300,000,000/1,290,000 = 232.5 meters

9. Intro to Tech - Radio 9 Amplitude Modulation l Includes Broadcast Radio 540 KHz to 1640KHz l Citizen Band l Amateur Radio l Television Video

10. Intro to Tech - Radio 10 Frequency Modulation l Broadcast FM from 88 MHz to 108 MHz l Aircraft, Marine, Taxi l Some digital transmissions l Television Audio l All Satellite Television

11. Intro to Tech - Radio 11 Electro Magnetic Radiation

12. Intro to Tech - Radio 12 Powerful Transmitters.. l 50 Kilo Watts into a large tower antenna l Can travel around the globe under certain weather conditions. l The signal strength is affected by many conditions including humidity, cloud cover and content, time of day, and the terrain.

13. Intro to Tech - Radio 13 The receiver.... l Always has some type of antenna to catch the signal transmitted. l A radio direction finder has a ‘directional’ antenna. l The weak signal from the antenna is amplified. l The information is removed from the carrier.

14. Intro to Tech - Radio 14 Noise is undesirable.. l Noise comes from many sources l It can interfere with the signal l AM is especially vulnerable l FM is preferred due to its immunity l TV Sound is FM, and generally quiet l AM Radio is often noisy- especially long distance reception.

15. Intro to Tech - Radio 15 Parts of an AM Radio l Power Supply l Tuner - Selects a desired frequency l RF Amplifier l Frequency Converter l Intermediate Frequency Amplifier l Detector l Audio Amplifier

16. Intro to Tech - Radio 16 Radio Waves - Wave Length l The speed of light.... l The frequency of the signal l The length of a wave l V = Lambda X F

17. Intro to Tech - Radio 17 The speed of light... l 186,000 Miles per Second l 300,000,000 Meters / Second l 1 Foot/Nano Second l 1 Nano Second is 1 billionth of a second.

18. Intro to Tech - Radio 18 Antennas are related to wavelength. l A quarter Wavelength... l Or multiples of a quarter wavelength used for best reception. l See part 2