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uhf antenna amplifier circuit schematic

UHF Antenna Amplifier Circuit

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

uhf antenna amplifier circuit schematic

UHF tv antenna amplifier PCB layout

uhf-antenna-amplifier-pcb-layout

UHF antenna amplifier parts placement layout

uhf-antenna-amplifier-parts-placement

14 Comments

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  • Ebrahim

    Thanks for providing this circuit.

    I would like to build this circuit, but there are some questions about it.

    Does C2 is 1nf and C3 is 10nf (nano farad)?
    What does metal shield means in this circuit, and how can i build it?

  • ajay

    Very nicely you told us about it.
    I can`t understood c(10p) and not found 2sc3358 in market.
    Is here any option of that. Can I use it for WI FI internet signals.
    Thanks

    • Anon

      @ajay
      C5, C6, C7, C8 [10p] are [ceramic disk] capacitors with the capacitance value of “10 Picofarad” [10p]. An equivalent or substitute transistor for 2SC3358 is BFG195.

      This circuit is not designed for WiFi amplifier, because WiFi is 2.4 GHz or 5GHz it is too high frequency for the transistor 2SC3358 or BFG195.

  • JKPieGuy

    This is a very nice circuit. But isn’t UHF considered obsolete for TV purposes now, since most/all frequences have been switched to digital? Correct me if I’m wrong though.

  • sagar

    sir,the UHF antenna amplifier circuit its a very nice circuit project but,i want a simple UHF oscillator circuit,which give a max, frequency output,also the components of this circuit are easily available from India..can you help me sir for this type of oscillator circuit.
    thank you sir.

  • Lester Bennett

    I know it’s very simple but can you tell me how the choke and capacitor for feeding 12v up the co-ax are connected and their values. I guess the capacitor is in series on the output to tv side to prevent feeding 12v to the TV set.

  • julius

    i have transistor BF200 insteady, can i use that

  • julius

    pliz i don’t much understand the pcb lay out in relation to circuit diagram pliz help me.

  • manu

    can it be connected with coaxial cable,, plz reply.

  • AQ

    Pleased to find this site!

  • richard byrd

    hi i mot to good build things so can i get a kits for antennas aamplifiers so i can just put it to get if so i like to know thank so much richard

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