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If I have a transmission line with a reflection coefficient of -0.3, and I feed it an input voltage of 5V, will my net voltage at the reflection point be

(1 - 0.3)*5 = 3.5V

or

(1 + 0.3)*5 = 6.5V

Came across this problem a couple of days ago and I'm still not quite sure whether or not the reflection coefficient being negative makes a difference to the outcome.

Thanks for all the help!

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The amplitude at the end is (1+coefficient)A:

From this question, the following animation shows the wave on a shorted transmission line. The coefficient is -1, so the amplitude is (1-1)A=0 :

enter image description here

The other extreme is an open end, were the amplitude is (1+1)A=2A:

enter image description here

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  • \$\begingroup\$ Okay, so in this case, given that the coefficient is 0.3, obviously the final answer should be 3.5V \$\endgroup\$ – Goat Herder Apr 14 '17 at 0:04

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