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Fm antenna booster4/8/2023 Insert a small capacitor (100pF) between the television and the power supply to block the DC voltage, you can insert in the ground line, but the recommended is in the postive line. The signal for the television is tapped from the ground and the connection between the inductor/choke and the long cable to the booster circuit. This two points is the connected to the output of the antenna booster circuit with the coaxial cable (the long cable from power supply to the circuit). Just use a conventional power 12 dc power supply, connect an RF choke or small inductor around 50-100uH, now you get two point: the plus from the choke/inductor and the ground from the power supply. Because of this, you need a special 12 v power supply for this. You can see that the circuit has no power supply input, and yes, this circuit is powered via the output signal cable. This antenna amplifier circuit should be installed as close as possible to the antenna, use the shortest possible cable for this, while you can use a very long cable from the output of this booster circuit to the television. P1 should be adjusted to get the best reception, and this adjustment should make the current consumption setting of about 5-15 mA. This antenna amplifier circuit need special attention for the layout, the transistor circuits should be shielded from the input circuit (as shown with the dashed line), and the wiring should be kept as short as possible to prevent parasitic inductance and capacitance. Here is the schematic diagram of the circuit: Bidirectional Dipole - This is perhaps the most commonly-used indoor FM antenna. Frequency Range : 88108 MHz (According to the scale adjustment) Impedance : 50. There are two basic antenna configurations generally used in unamplified indoor antennas, both are dipoles. The circuits is configured as a common-emmitter tuned RF preamplifier wired around VHF/UHF transistor Q1. This antenna booster gives around 10 to 15 dB amplification. Circularly polarized FM antenna 88 -108 MHz continue adjustable for 300W FM Transmitter. This amplifier will pull in all distant FM stations clearly. The circuit is utilizing two tunable tank circuits. The transistors are universally useful 2N3904. The circuit is utilizing two transistors to expand the signal gain to a satisfactory level. This antenna signal booster works for TV receiver in UHF band (400-850MHz). The following is a schematic of a tunable FM antenna booster or FM antenna circuit which utilizes to enhance distant radio signals.
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