1. Telecommunication 1.3 – Radio and Television

2. Radio and TV Receivers The parts of a radio and TV receiver can be represented by a block diagram. Write the name of each part of the radio receiver and the television receiver in the correct block. In the surrounding space, state the function of each part.

3. aerialtunerdecoderamplifier loudspeaker power supply picks up ALL signals (various frequencies) one signal selected (one frequency) decodes signal signal is made bigger provides amplifier with electrical energy electrical energy changed to sound energy. The Radio Receiver

4. aerialtuner decoder (sound) amplifier (sound) loudspeaker power supply decoder (vision) amplifier (vision) TV tube The TV Receiver Each part has the same function as in the radio receiver. The sound and vision signals are separate and require to be synchronised. electrical energy changed to light energy.

5. Radio Waves Radio waves are the signals our aerial receivers pick up. A radio station transmits a low frequency audio (sound) wave with a very high frequency carrier wave. The two waves are combined together either by: amplitude modulation frequency modulation

6. Amplitude Modulation (AM) + audio wave (low frequency) carrier wave (very high frequency) amplitude modulated wave

7. Frequency Modulation (FM) + audio wave (low frequency) carrier wave (very high frequency) frequency modulated wave

8. Radio Transmission