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.
Hello, I think you will have to take a look at the theory on transmission lines. Here is a page from the EDUCYPEDIA with some links on the subject: http://www.educypedia.be/electronics/transmissionlines.htm Bertus