Antenna amplifier of meter waves for several TVs. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Antenna amplifiers
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The amplifier is a modification of my correction amplifier for cable TV, and is distinguished by the presence of several outputs with signal level control.
It can be used as an antenna amplifier for meter waves (48-230 MHz) with signal distribution to several TVs. If the lengths of the output cables are approximately equal, then the builders of the level R11, R12 ... can be omitted by connecting the bases of the transistors VT4, VT5 ... directly to the emitter VT3. The number of outputs can be increased by adding additional signal repeaters, and by reducing the value of the resistance R10 inversely proportional to the number of channels.
The frequency response of the amplifier is regulated according to the "swing" principle and can be either linear or inverse frequency dependence of attenuation in the cable.
By providing a preliminary correction of the channel levels in frequency, it is possible to obtain their equality at the output of a long distribution cable. The amplifier is linear at input signal levels not exceeding 19 mV, providing an undistorted signal at the output level up to 600 mV.
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Author: E.Shustikov, UO5OHX ex RO5OWG; Publication: shustikov.by.ru
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