Homework Help

Discussion in 'Homework Help' started by Bill B, Dec 28, 2010.

  1. Bill B

    Thread Starter Active Member

    Nov 29, 2009
    61
    0
    I have a homework problem I can't solve. This topic wasn't covered in class and the textbook offers no explanation, yet this problem is in the textbook! The problem is as follows:

    Given a 100-Watt power source, what is the maximum allowable length for the following transmission media if a signal of 1 Watt is to be received?
    a. 24-gauge twisted pair operating at 300kHz
    b. 24-gauge twisted pair operating at 1MHz
    c. 0.375" coaxial cable operating at 1MHz
    d. 0.375" coaxial cable operating at 25MHz
    e. optical fiber operating at its optimal frequency

    So far I have determined that the total loss from 100W to 1W is 20dB. A twisted pair rated at 0-1MHz has an attenuation rate of .7dB/km @ 1kHz. I tried to manipuate the ratio and came up with 4.8 meters. I have no idea how to approach this problem. Any help would be appreciated.
     
    Last edited: Dec 28, 2010
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    This thread clearly belongs in the homework forum so I have relocated it there.

    hgmjr
     
  3. Bill B

    Thread Starter Active Member

    Nov 29, 2009
    61
    0
    Thanks. I should have known to put a thread titled Homework Help in the Homework Help forum.:rolleyes:
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Bill B likes this.
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