Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358 – Antenna amplifier for digital tv band

This HD TV UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 – 850 MHz domain frequency so it can be used where the tv signal is weak.

For this UHF antenna tv amplifier to work correctly you need to cut the components pins as short as possible. C1, C2, C6, C7 are SMD type ( surface mounted ). This antenna tv amplifier or uhf wideband amplifier need to be build inside of a metal box and then connected close to the tv antenna.

Prototype pictures

amplifier uhf dtv digital antena 450x322 Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358   Antenna amplifier for digital tv band

amplifier uhf tv digital antena 2sc3358 2 450x337 Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358   Antenna amplifier for digital tv band

Antenna HD TV UHF band amplifier circuit schematic

DTV antenna uhf tv amplifier Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358   Antenna amplifier for digital tv band

PCB layout for Wideband HD TV UHF Antenna TV Amplifier Circuit using transistor 2sc3358

uhf antenna amplifier pcb layout Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358   Antenna amplifier for digital tv banddtv antenna amplifier parts placement 2sc3358 Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358   Antenna amplifier for digital tv band

The power supply is a simple 12V stabilized source. The antenna tv amplifier can be connected directly to the power supply thru coaxial cable of the tv antenna but you need a 10 – 100uH coil on the alimentation line. The tv set will be connected to the uhf amplifier thru a small coupling capacitor.
Adjusting is easy, just bring the P1 to the middle and then adjust it untill you obtain the best tv image quality.

Digital Tv antenna UHF amplifier components:

  • T1 -Transistor 2sc3358
  • C1 – 10µF/35v
  • C2,C9 – 1nF
  • C3 ,C4 – 10nF
  • C5,c6,c7,c8 – 10pF
  • R1 – 470 Ohms
  • R2 – 2.2 K
  • R3 – 1Kohms
  • P1 – 5Kohms
  • L1,L2 – 2 turns 22AWG , 3mm Ø.
  • L3,L4 – 10uH or 10 turns, 0.2mm Ø on ferrite..
  • 12 volts special power supply.

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2sc3358 equivalent

Filed Under: AmplifierCircuitsRF

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About the Author: Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

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  1. Ramiro says:

    The amperage is very low, i think no more of 50mA.I’am using a simplified circuit with this transistor to get more gain before of input of a cheap amplifier. 5db+20db?

  2. GLEISON DA SILVA VANDERLEY says:

    OLÁ TONI EU TENHO UMA DÚVIDA SOBRE O CIRCUITO DO AMPLIFICADOR DE TV UHF A ALIMENTAÇÃO E 12 VOLTS MAIS A ÁMPERAGEM E NO VALOR DE QUANTOS ÁMPERES OU MÍLIAMPERES DA FONTE.UMA OUTRA DÚVIDA O CIRCUITO PODE SER LIGADO A UMA ANTENA EXTERNA OU SERIA A PENAS PARA ANTENA INTERNA.DESDE-JÁ AGRADESSO.

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