LC low pass filter arrangement

Discussion in 'General Electronics Chat' started by diwa2000@gmail.com, Jun 17, 2008.

  1. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    hello guys
    is the arrangement for RC and LC low pass filter is the same. because Im working at 433MHz freq...at present Im making use of a RC LPF, I have coonnected a quarter wave whip antenna to the input and the output is connected to a spectrum analyser. the problem Im facing is that when I connect the antenna to the RC filter and check the output there is a loss of around -10dBm observed. Also Im not sure but may be because of teh quarter wave whip antenna the RC low pass filter is not performing its action. The values for my RC filter ckt are R=36 and C=10pf. comming back to the same question is teh arrangement of RC and LC low pass filter the same. please help.
    Thanks
    Diwakar
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    On this page there is a calculator to design low and high pass filters.
    You can go upto 9 pole filters.
    http://www.wa4dsy.net/filter/hp_lp_filter.html

    Greetings,
    Bertus

    PS you are confusing by multiple postings with the same subject.
    You can alway edit a question or enhance it.
     
    Last edited: Jun 18, 2008
  3. theamber

    Active Member

    Jun 13, 2008
    318
    0
    RC is a much purer filter. You may have an impedance mismatch a network analyzer may help you.
     
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