Television receiver signal overload

THE PROBLEM of signal overload has become increasingly severe as a result of the trend in modern television receiver design toward higher sensitivity. Most television manufacturers at present use either a high-gain pentode or cascode type of radio frequency (r-f) amplifier in their very-high-frequency tuners followed by an efficient mixer and three or four stages of amplification. The gain resulting from this combination coupled with higher radiated transmitter power gives rise to the serious problem of receiver overload in some areas. Signal levels of the order of 1.0 volt have been measured in the New York City area.