T V RECEIVER

• The receiving antenna intercepts the radiated picture and sound carrier signals and feeds them to the RF tuner.
•  The receiver is of the heterodyne type and employs two or three stages of intermediate frequency (IF) amplification. 
• The output from the last IF stage  is demodulated to recover the video signal. 
• This signal that carries the picture information is amplified and coupled to the picture tube which converts the electrical signal back into picture elements of the same degree of black and white. 
• The picture tube shown in Fig. 1.3 is very similar to the cathode-ray tube used in an oscilloscope. 
• The glass envelope contains an electrongun structure that produces a beam of electrons aimed at the fluorescent screen. 
• When the electron beam strikes the screen, light is emitted. 
• The beam is deflected by a pair of deflecting coils mounted on the neck of the picture tube in the same way and rate as the beam scans the target in the camera tube. 
• The amplitudes of the currents in the horizontal and vertical deflecting coils are so adjusted that the entire screen, called raster, gets illuminated because of the fast rate of scanning.

 

          

• The video signal is fed to the grid or cathode of the picture tube.
•  When the varying signal voltage makes the control grid less negative, the beam current is increased, making the spot of light on the screen brighter. 
• More negative grid voltage reduces the brightness. if the grid voltages is negative enough to cut-off the electron beam current at the picture tube there will be no light. 
• This state corresponds to black. 
• Thus the video signal illuminates the fluorescent screen from white to black through various shades of grey depending on its amplitude at any instant. 
• This corresponds to the brightness changes encountered by the electron beam of the camera tube while scanning the picture details element by element. 
• The rate at which the spot of light moves is so fast that the eye is unable to follow it and so a complete picture is seen because of the storage capability of the human eye.
• The path of the sound signal is common with the picture signal from antenna to the video detector section of the receiver. 
• Here the two signals are separated and fed to their respective channels. 
• The frequency modulated audio signal is demodulated after at least one stage of amplification. 
• The audio output from the FM detector is given due amplification before feeding it to the loudspeaker.              It is essential that the same coordinates be scanned at any instant both at the camera tube target plate and at the raster of the picture tube, otherwise, the picture details would split and get distorted. 
• To ensure perfect synchronization between the scene being televised and the picture produced on the raster, synchronizing pulses are transmitted during the retrace, i.e., fly-back intervals of horizontal and vertical motions of the camera scanning beam. 
• Thus, in addition to carrying picture detail, the radiated signal at the transmitter also contains synchronizing pulses. 
• These pulses which are distinct for horizontal and vertical motion control, are processed at the receiver and fed to the picture tube sweep circuitry thus ensuring that the receiver picture tube beam is in step with the transmitter camera tube beam.