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T9BEdit

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

T9B01

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

T9B02

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

T9B03

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

T9B04

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

T9B05

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

T9B06

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

T9B07

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

T9B08

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

T9B09

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

T9B10

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

T9B11

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

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