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30 per cent Accordingly adjusted aerial Alexandra Palace Alternating Current amplifier amplifying valves amplitude anode anode load anode voltage application network applied arrangement B.Sc band width bias capacitance carrier value cathode tube characteristic co-axial co-axial cable coils condenser conductor connected control grid correct coupling D.Sc decoupling deflection demodulator device diode diode load dipole effect Electrical electronic electrostatic tube employed Engineering feeder fly-back frame scan frame synchronizing frequency changer gas relay impedance impulses inductance input interlaced intermediate frequency light line and frame line scan linear M.Sc magnetic modulation necessary obtained obviously ohms operating oscillator output pentode picture PITMAN possible potential potentiometer Practical produce raster reception resistance screen Second Edition shown in Fig signal sound spot suitable superheterodyne superheterodyne receiver synchronizing circuit synchronizing pulse telephony television Third Edition transmission line transmitted triode tuned circuit variation vision receiver wave-form wavelength whilst wire