local oscilator

Discussion in 'Wireless & RF Design' started by CHANDU4KALYAN, Sep 6, 2013.

  1. CHANDU4KALYAN

    Thread Starter New Member

    Sep 6, 2013
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    hai, guys i am new to this forum , i am working on this project now, plz give any usefull links about local oscilator
    thanks in advance
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. CHANDU4KALYAN

    Thread Starter New Member

    Sep 6, 2013
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  4. CHANDU4KALYAN

    Thread Starter New Member

    Sep 6, 2013
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    THIS IS THE CIRCUIT OF LOCAL OSCILATOR, i searched for the function of this, but i didn't find it.so, Plz explian the circuit
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The PDF is of a very bad quality.
    I can not read any text.

    Bertus
     
  6. CHANDU4KALYAN

    Thread Starter New Member

    Sep 6, 2013
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    sir we are actually using crystal and three stages of transistors(( tank circuit at collector terminal) for obtaining the required 389mhz frequency and finally using filter for eliminating or derceasing the
    sub harmonics and spurious
     
  7. vk6zgo

    Active Member

    Jul 21, 2012
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    You have basically covered all the explanation which could be done looking at that schematic.

    I can guess that the original crystal frequency is somewhat lower & is multiplied in the three stages,but whether they are doublers,or triplers or whatever is anyone's guess.

    I think it is a drawing of a practical circuit,& it looks as if the capacitance for each resonant circuit is supplied by stray capacitance,as no physical capacitors are shown in the collector circuits.
     
  8. CHANDU4KALYAN

    Thread Starter New Member

    Sep 6, 2013
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    yes sir it's a practical circuit and we are designing it
     
  9. yasser55

    New Member

    Oct 6, 2013
    1
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    Thank you good follow-up
     
  10. shteii01

    AAC Fanatic!

    Feb 19, 2010
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