Unit TV Antenna Amplifier ----- Antenna Amplifier

Keywords: single tube TV antenna amplifier The elements used in the single-tube TV antenna amplifier shown below have less cost, simple production, and no need to adjust, high performance indicators, especially suitable for radio enthusiast amateur production. Principle and production: The television signal received by the antenna is coupled to the base of the transistor BG via the capacitor C1, and then outputs the collector resonant circuit. The amplifier has a band width of 46-240 MHz, and the power gain scale KP> 16dB, the noise of the amplifier is small, and there is strong inhibitory ability to 10 38MHz. The amplifier has a working voltage of 3V +0.5V, and the current consumption is only about 3 mA, so two-section 5 battery can be used. Transistor BG can be used with ultra-high frequency tubes such as 9018, 3DG80B, 3DG84B, and the capacitance C1-C3 uses a porcelain capacitor. C4 uses a small electrolytic capacitor with a small leakage, coil L1 and L2 use a lacquered wire having a wire diameter of 0.35 mm, which is wound around a round rod having a diameter of 3.5 mm. L1 is around 9 laps, and L2 is around 11 laps. The entire circuit is mounted in a shield. The input and output lines are used with a 75Ω cable.

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