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04-09-2010

UHF antenna amplifier

This amplifier circuit is used to amplify TV signals in UHF range. It uses a low-noise transistor and gives 10 to 15 dB amplification in the frequency range from 400 MHz to 850 MHz.

The transistor must be shielded from the input components and in constructing this circuit, the wirings must be as short as possible. For best results, the cable must be directly soldered to the PCB. The circuit should be installed near the antenna and housed in a water proofed case.

The power supply for this uhf tv antenna amplifier is fed through the cable by using a choke coil. To prevent the DC voltage from getting into the TV set, the coaxial cable must be coupled to the set through a small value capacitor.

To align the amplifier, just adjust P1 until the best reception is achieved. It means a collector current between 5 and 15 mA.

UHF antenna amplifier circuit diagram

LI, L2 = Aircore 2 turns 0.5mm ø3mm (coil diameter)
L3, L4 = 10 uH HF choke or 0.2mm ø10 turns in ferrite core



UHF tv antenna amplifier PCB layout

UHF antenna amplifier parts placement layout

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