RF power amplifier

Discussion in 'Wireless & RF Design' started by veerasamy, Oct 7, 2009.

  1. veerasamy

    Thread Starter New Member

    Oct 7, 2009
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    I am currently working on radio transmission and reception at the frequencies of around 200MHz. The range of transmission is not currently important.
    It is enough if I could transmit for 10 meters or so. My question is, Is it necessary to have a power amplifier? Can an ordinary gain block can be used?
    Will antenna be able to radiate without PA?

    thanks & regards,
    veerasamy
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
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    You should have no trouble using small signal transistors/FETs or other components to generate enough signal for transmission over 10 metres.

    However it would not be wise to try to drive a transmitting antenna directly without interposing buffers to match the impedance levels.
     
  3. veerasamy

    Thread Starter New Member

    Oct 7, 2009
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    Thank you Studiot. I am using the Gain block ICs. It is internally matched with 50 ohm impedance. Will there be any other issues?
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
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    513
    Use 50Ω coax to connect from the board to the antenna.

    Depending upon the physical format of the antenna you may require a balun.

    Altenatively you might try a printed circuit antenna. That should reach 10 metres.
     
  5. veerasamy

    Thread Starter New Member

    Oct 7, 2009
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    thanks studiot
     
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