want to build a cell phone amplifier?

Discussion in 'The Projects Forum' started by warrior_joe, Feb 27, 2010.

  1. warrior_joe

    Thread Starter New Member

    Feb 27, 2010
    Hi , I want to build a 800mhz wireless cell phone amplifier. Wilson sells them, but they are very expensive! Why is the cost so high? Are they that difficult to build? Any input is appreciated.
  2. Papabravo


    Feb 24, 2006
    Yes they are difficult to design and build without some background in RF engineering and high frequency design. They rely on modern surface mount manufacturing techniques to keep lead lengths short, control impedance, and avoid losses.

    I would be greatly surprised if you could even find suitable components in "small" quantities at a price you would be willing to pay.
  3. Externet

    AAC Fanatic!

    Nov 29, 2005
    Just imagine you built or bought that wonderful RF amplifier.
    Now your cell phone sends the signal to a 20 mile ! away tower and gets there with plenty of signal strength. Great ! :D

    Nope. :( That tower has no power/range to reach your cell receiver, or your receiver has no sensitivity to hear the tower; or the cell phone duplexer circuit is deafened by the higher power amplifier you implemented, or all of the above.
  4. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    Cell phones operate at many frequencies today, not just at 800MHz like 15 years ago. Some use Spread-Spectrum-Frequencies that keep changing.

    Some buildings and underground parking lots have the send and receive amplifiers.
  5. warrior_joe

    Thread Starter New Member

    Feb 27, 2010
    thanks for the info! appreciate your help!