Help with transmission line impedance problem

[commelion]

hi

need some direction on this problem please.

see attached file, i decided to type more or less my progress,instead of attaching nonsence !. i had had a few more ideas but no luck. any positive direction would be much appreciated, I've looked back at my textbook (electromagnetics by hayt & buck) but can't find a single other idea form the chapter on transmission lines.


regards

 

[rude man]

<< The sending end impedance of a 20 Km length of transmission line is 294 + j170 when open circuited, and 1000 – j1190 with the receiving end open circuited. >>

When the sendinmg impedance is measured, what is the state of the receiving end? Is it not given in the problem? What does it mean " ... when open-circuited"? Can't mean the receiving end.

I don't understand the conditions of this problem.