Transmission Line Help Please

Discussion in 'Homework Help' started by M.Obaidi, Aug 20, 2012.

  1. M.Obaidi

    Thread Starter New Member

    Aug 20, 2012
    2
    0
    Hi Guys
    I'm new here and i wonder if you can help me with my problem
    i have a sheet of questions that i can't solve and i need your help to tell me the name of the book that these questions are brought from ..
    i'll put one of them here and if you can solve it then give me the answer please or the name of the book.. thank you alot

    Q. A typical open-wire telephone line has an attenuation of 0.0050 neper per mile at 1000 cps, while a typical loaded telephone cable has an attenuation of 0.050 neper/mile at this frequency. For Each of these lines, compute the lenght which will give an attenuation of 10 db.

    Thanks
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    All you need is the conversion factor for Neper to dB, and a little math.
     
  3. BillO

    Well-Known Member

    Nov 24, 2008
    985
    136
    1 Bel = 10 db = 1.1513 Neper
     
    M.Obaidi likes this.
  4. cork_ie

    Member

    Oct 8, 2011
    348
    58
    Out of interest folks - as Neper and dB are logarithmic units, does it follow that if there is X Neper attenuation/mile at a certain frequency that for n miles the attenuation is nX Neper? or is the math a little more complex than that?
     
  5. steveb

    Senior Member

    Jul 3, 2008
    2,433
    469
    It's as simple as that, which is why people like logarithmic scales for measurements like this.
     
    M.Obaidi and cork_ie like this.
  6. M.Obaidi

    Thread Starter New Member

    Aug 20, 2012
    2
    0
    thank you for your help
     
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