Debug-free FM antenna amplifier production

The principle of the amplifier is as follows:
The input end is connected to the antenna with a 75-ohm high-frequency coaxial cable. The signal is first filtered by an FM band-pass filter to remove other spurious signals other than FM to improve the signal-to-noise ratio and reduce cross-modulation interference. It must not be omitted, and then the signal input is an amplifier circuit composed of BG1 and BG2. This design uses only one level of amplification to avoid the high gain signal but instead makes the intermodulation become more powerful, the strong station affects the weak station, and the selective change Poor, another one is easy to self-excitation, increasing the difficulty of debugging. At the same time, this stage of amplification uses a cascode circuit, so the gain is high, the frequency bandwidth, the work is stable, and it is easy to make in amateur conditions. The amplifier circuit has been carefully designed by the author. The debugging-free mode greatly improves the success rate of production. Finally, the signal is output to the indoor by the coaxial cable. Because the amplifier circuit is installed on the outdoor antenna and the power is placed indoors, the circuit design is set by L1, L2, C3, The frequency isolation circuit formed by C4, so that the high-frequency cable transmits the DC power to the amplifier while transmitting the signal, and the gain of the amplifier can be changed by adjusting the value of the potentiometer R (L). The author used the shell of the splitter as a shield, and the effect was quite good. The specific circuit diagram is as follows:

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