What is inside FEED Horn

Discussion in 'Wireless & RF Design' started by RRITESH KAKKAR, Dec 12, 2015.

  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Hello,
    Yesterday, the weather was not good and monkey has fallen my Dish from Roof to down due to which the Feed horn plastic body was broken totally.
    I though The Dish Antenna will not work now, after hours of finding Signal i find Signal from Satellite.
    it was working the signal level was not good enough may be due to error on surface rough.
    I find there was needle structure pin inside the Feedhorn.
    how it is working after brokenor was that plastic body just was upper surface now when there will be rain will it will not work from water.

    http://s.hswstatic.com/gif/satellite-tv-7.jpg
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    Usually they contain an LNA (Low Noise Amplifier). Who knows what damage was done from your description?
     
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  3. BR-549

    Well-Known Member

    Sep 22, 2013
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    A dipole.
     
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  4. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Ok.
    this was Ku band.
    how does the antenna receive the signal from satellite which is very very far in atmosphere.
    there is vertical an horizontal polarity in it.
    the aluminum frame is very strong of feedhorn.
    how it work ?
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    All antennas receive weak signals from far away. Small voltages and currents in antennas are detected, amplified, and decoded all the time. A typical transmitter might have 10 watts of power output for example. By the time this signal gets to the receiver it might only have a power level measured in the tens of femtowatts (that is 1e-14 watts). So 15 orders of magnitude attenuation in signal power is not beyond the ability of modern receivers to utilize.
     
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  6. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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  7. RRITESH KAKKAR

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    Jun 29, 2010
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    does satellite is also Transmit 10watt signal?
     
  8. Papabravo

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  9. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    i have no idea please tell more about feehorn.
     
  10. Papabravo

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    Feb 24, 2006
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  11. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    I understand in more in simple word.
     
  12. Papabravo

    Expert

    Feb 24, 2006
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    I don't think I can explain it in any simpler words.
     
  13. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    please tell more if you can
     
  14. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    why we used coaxial cable?
     
  15. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    WHAT does it resistance mean?
     
  16. SLK001

    Well-Known Member

    Nov 29, 2011
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    A femtowatt is 1E-15 watts.
     
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  17. Papabravo

    Expert

    Feb 24, 2006
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    From post #5
    ...tens of femtowatts (that is 1e-14 watts).

    I know that and if you read my post carefully, I said tens of femtowatts which would be 1e-14. At least, someone was paying attention.
     
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  18. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Do, you work in Communication Project.
     
  19. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    from what job sir?
     
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