Superheterodyne AM Reciever

Discussion in 'Wireless & RF Design' started by shano80, May 10, 2011.

  1. shano80

    Thread Starter New Member

    Sep 13, 2010
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    Hello, Im trying to build a L.O. with a 42IF300 transformer from mouser with a SA602 double balanced mixer and oscillator IC. Basically Im working on a superheterodyne AM reciever.I was expecting to be able to put an o-scope on pin 6 and get a frequency that is 455khz higher than the RF.Highest frequency I get with my L.O. configuration is 1500KHz using a 141/60pF capacitor.I realize the info Ive left is vague but if anyone is familiar with this any info properly constructing a L.O. for a superheterodyne AM reciever would be wonderful.
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    Post a schematic of what you have built and you will get more involvement/interest in your thread.
     
  3. shano80

    Thread Starter New Member

    Sep 13, 2010
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  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    OH a link. How nice.


    Here is a link to my answer then.

    www.google.com
     
    shano80 likes this.
  5. shano80

    Thread Starter New Member

    Sep 13, 2010
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  6. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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  7. shano80

    Thread Starter New Member

    Sep 13, 2010
    9
    0
    Hello, Im trying to build a L.O. with a 42IF300 transformer from mouser with a SA602 double balanced mixer and oscillator IC. Basically Im working on a superheterodyne AM reciever.I was expecting to be able to put an o-scope on pin 6 and get a frequency that is 455khz higher than the RF.Highest frequency I get with my L.O. configuration is 1500KHz using a 141/60pF capacitor.


    [​IMG]
     
  8. bertus

    Administrator

    Apr 5, 2008
    15,648
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    Hello,

    Pin 6 is the input for the oscillator.
    Pin 7 is the output for the oascillator.
    The oscillator signal is very weak and can only be measured using a buffer.
    See figure 6 in the attached datasheet for more info.

    Bertus

    PS I merged the threads as the subject is the same
     
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