please suggest

Discussion in 'General Electronics Chat' started by diwa2000@gmail.com, Jun 16, 2008.

  1. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    hello guys would it be right to say ......

    "The importance of using this RC filter is due to its low pass action and secondly it removes any ripples present in the AC signal being received by the antenna, as the capacitor acts as DC block."

    please suggest.

    Thanks
     
    Last edited by a moderator: Jun 16, 2008
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Whether the description is right or not depends on what is being described. Which low-pass filter are you using, what are you using it for, and how are you using it?
     
  3. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    Dear thingmaker

    Im using a RC filter which is connected to a quarter wave whip antenna. This antenna receives a signal in the magnitude of 433MHz. According to the principle of a RC low pass filter and components chosen this circuit should block all the frequency components above 433MHz and allow the signals below this frequency.

    I have printed a PCB and Im mounting the antenna at the input through a SMA connector. hope this answers your questions.

    My question is does it reduce down the power level of the signal that comes out of the RC circuit. and also....

    "The importance of using this RC filter is due to its low pass action and secondly it removes any ripples present in the AC signal being received by the antenna, as the capacitor acts as DC block."

    Please help.
    thanks
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    The comments regarding ripple and DC blocking are not applicable. Ripple is a concern in power supply filters. DC blocking is a concern where DC is present and unwanted.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You might get some valuable information reading up on antenna theory. Your antenna is part of a resonant structure, and does not need filtering in the sense that you are trying to apply. A 440 Hz tuning fork does not respond to a 439 Hz sound because it is a resonant structure that only captures energy at a particular wavelength - 440 Hz.
     
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