The T9B section covers feedlines; types, losses vs. frequency, SWR concepts, matching weather protection, connectors.
Click "Expand" to reveal the questions.


Why is it important to have a low SWR in an antenna system that uses coaxial cable feedline?
To allow the efficient transfer of power and reduce losses


What is the impedance of the most commonly used coaxial cable in typical amateur radio installations?
50 [ohm]]s


Why is coaxial cable used more often than any other feedline for amateur radio

antenna systems?

It is easy to use and requires few special installation considerations


What does an antenna tuner do?
A. It matches the antenna system impedance to the transceiver's output impedance


What generally happens as the frequency of a signal passing through coaxial cable is increased?
The loss increases


Which of the following connectors is most suitable for frequencies above 400 MHz?
A Type N connector


Which of the following is true of PL-259 type coax connectors?
They are commonly used at HF frequencies


Why should coax connectors exposed to the weather be sealed against water intrusion?
To prevent an increase in feedline loss


What might cause erratic changes in SWR readings?
A loose connection in an antenna or a feedline


What electrical difference exists between the smaller RG-58 and larger RG-8 coaxial cables?
RG-8 cable has less loss at a given frequency


Which of the following types of feedline has the lowest loss at VHF and UHF?
Air-insulated hard line

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