Hello! Here is lesson 25 covering the T7C questions dealing with antenna measurements and troubleshooting. This is a fairly simple lesson. The two main topics deal with Standing Wave Ratio (SWR) and not to let moisture into your coaxial cable. Generally speaking, SWR measures how well a signal from a transmitter is matched to a transmission line. An SWR meter will provide you with a ratio of how much of the signal you're trying to transmit is being reflected back at the transmitter through the feedline. A 1:1 ratio is perfect. Unfortunately, a 1:1 is a little impossible to get. However, you can come very close. A high SWR may not only mean that your signal is doing nothing but heating your feedline, but the reflected power could potentially damage you equipment. I found a nice and basic overview of coaxial cable and SWR which you can find the link to in the Ham Links box.
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