Yagi Uda..!

Discussion in 'General Electronics Chat' started by R!f@@, Mar 9, 2012.

  1. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    I always wonder who these guys were, during the learning days.
    It's always them Japs that comes up with such things. I wonder why only Japan.

    Anyways. I am thinking of making one to transmit the UHF band to around half a kilometer.
    Me got some extensive readings to do in order to get the hang of this thing.

    So I like to know any one here have any experience in building one of these buggers. :D
  2. Audioguru


    Dec 20, 2007
    My radio controlled model airplanes have inexpensive transmitters and very small inexpensive receivers that work with microwave frequencies at 2.4GHz. The range is as far as you can see (500m? 1km?). The antennas are only a few cm long.
    Some receivers use 2 antennas and 2 detectors (diversity) to avoid multipath interference from signal reflections.

    I have never made microwave things because it is like plumbing.
  3. k7elp60

    AAC Fanatic!

    Nov 4, 2008
    The smallest yagi antenna has three elements and has a forward gain of approximately 9db. It consists of a reflector(about 20% longer than a 1/2λ length), a driven element= 1/2λ), and a director(about 10% less than a 1/2λ) With the velocity of the waves in a conductor added to the formula.
    If your frequency is near the UHF TV channels get a small TV antenna.
    R!f@@ likes this.
  4. bertus


    Apr 5, 2008
    R!f@@ likes this.
  5. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    I will be back for this soon.

    Tomorrow me got a CNC to repair for the first time ever.