šColour Tv Receiver
• RECEIVER
Block diagram of a monochrome TV receiver is shown. It consists of RF Tuner, Receiver antenna, common IF amplifier, video detector, video amplifier, scanning and synchronizing circuits, sound IF amplifier, FM Sound demodulator, Audio amplifier, Loud Speaker, Picture tube.
• RECEIVER ANTENNA:
Receiver antenna intercepts the radiated RF signals and sends it to RF Tuner.
• RF TUNER:
RF Tuner selects the desired channel frequency band from the receiving antenna.
• COMMON IF AMPLIFIER:
There are 2 or 3 stages of IF amplifiers.
• VIDEO DETECTOR:
Used to detect video signals coming from last stage of IF
amplifiers.
• VIDEO AMPLIFIER:
It amplifies the detected video signal to the level required.
• PICTURE TUBE:
Picture tube converts the electrical signal back into picture elements of the same degree of black and white.
It is very similar to cathode ray tube used in oscilloscope.
• SOUND IF AMPLIFIER:
Detected audio signal is separated and selected for its IF
range and amplified.
• FM SOUND DEMODULATOR:
FM Sound signal is demodulated in this stage.
• AUDIO AMPLIFIER:
FM demodulated audio signal is amplified to the required level to feed into the loud speaker.
• LOUD SPEAKER:
Loud Speaker converts FM demodulated amplifier signal
associated with picture being televised into proportionate sound signal.
