Measuring SNR

Discussion in 'General Electronics Chat' started by mahmoud shendy, Mar 23, 2010.

  1. mahmoud shendy

    Thread Starter Member

    Dec 23, 2007
    21
    0
    Dear everybody,
    I want to measure the SNR from a DVB-S satellite, using a module that receive the signal and can be interfaced to microprocessor based system via SPI/I2C or RS232 to get the signal SNR.
    what is the module can make such function?
    please help me to get the right way...
    best regards,
    MAhmoud
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Dear Mr. Shendy
    Before that tell us what you know about the things below.
    1. DVB-S transmission
    2. Micro processors
    3. SPI interface
    4. I2C bus protocol
    5. RS232
    and last but not the least SNR.

    Then I can give you a module schematic to build one.
    How's tht? :D
     
  3. mahmoud shendy

    Thread Starter Member

    Dec 23, 2007
    21
    0
    Dear,
    I know that:

    1. DVB-S is the commond Digital Video Broadcast that uses the frequency range: 925 - 2125MHz.

    2. Micro processors: For many years I use AVR microcontroller in my control application, I build the hardware, then I write the code in C as the firmware.

    3. SPI interface: The serial peripheral interface that communicate the microprocessor or the microcontroller to the peripheral by sending syncronous data with a clock in a manner of a master and slave.

    4. I2C bus protocol: I interfaced many memory modules using this protocol and familiar with it.

    5. RS232: a protocol of asynchronous serial communication used to interface using a speed called a Baud rate and start ,stop, data bits stream.

    SNR: Signal to noise ratio, determines the quality of the signal received.

    I made many designs, but this is the first time to keep in touch with reading a signal from satellite communication system use the DVB-S modulation.

    best regards...
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    For DVB detection ur insight on this is limited. U need to learn about the modulation technics, and transmission ranges from a typical antenna. DVB is sometimes really troublesome to get good fix
    For a start try to get ur hands on DVB-s signal finder cum strength meter
     
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