Antenna amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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The antenna amplifier (see figure) allows you to raise the level of television signals in the meter range by 12-15 dB. It is made on two field-effect transistors (KP303). The signal from the antenna is fed to the input circuit L1C1, tuned to the average frequency of the received signal. From coil 13, voltage is supplied to the gate of transistor T1. Transistors T1 and T2 are connected in cascode. This provides high gain and eliminates spurious feedback from the output of the amplifier to its input. The load of transistor T2 is the resonant circuit L3C5. From the part of the L3 coil, the signal is fed to the Gn2 socket.
Coils L2 and L3 are wound with a wire with a diameter of 0,9-1 mm. The distance between adjacent turns should be equal to the diameter of the wire. Coil L1 is wound between the lower turns of coil L2 with a wire of smaller diameter. Coil L1 contains 2 turns, coil L2-5 turns. L3-6,5 turns (retraction from the 5th turn from above). The diameter of the coil frames is 6-8 mm. The tuning cores are made of HF ferrite. Choke Dr1 contains 12 turns of wire with a diameter of 0,12-0,15 mm, wound on a frame with a diameter of 3 mm, turn to turn.
Literature
- "Practical Vireless" (England), 1974, November
- Radio #6, 1975
Publication: N. Bolshakov, rf.atnn.ru
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