Antenna amplifier MV. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Antenna amplifiers
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The figure shows a diagram of an antenna amplifier designed to amplify the signals of all 12 MB channels. Its gain is 25 dB at a supply voltage of 12 V. The current consumption is 18 mA. Diodes connected back-to-back at the input protect the amplifier transistors from damage by lightning discharges.
Both stages are assembled according to the scheme with a common emitter. Capacitor C6 provides frequency correction for the amplifier characteristics in the high frequency region. To stabilize the transistor mode, the amplifier is covered by negative feedback from the emitter of the second transistor to the base of the first. To avoid self-excitation of the amplifier due to parasitic feedback between the stages through the power supply, a bypass filter R4 C1 is used. The amplifier is installed in close proximity to the antenna and is supplied with power through a cable isolation.
Author: Nechaev I.; Publication: cxem.net
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