Section T9B Feed lines: types of feed lines; attenuation vs. frequency; SWR concepts; matching; weather protection; choosing RF connectors and feed lines
Terms in this set (11)
Why is it important to have a low SWR in an antenna system that uses coaxial cable feed line?
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?
Why is coaxial cable used more often than any other feed line for amateur radio antenna systems?
It is easy to use and requires few special installation considerations
What does an antenna tuner do?
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 feed line loss
What might cause erratic changes in SWR readings?
A loose connection in an antenna or a feed line
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 feed line has the lowest loss at VHF and UHF?
Air-insulated hard line
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Section T0C RF hazards: radiation exposure; proximity to antennas; recognized safe power levels; exposure to others; radiation types; duty cycle
Section T0B Antenna safety: tower safety; erecting an antenna support; overhead power lines; installing an antenna
Section T0A Power circuits and hazards: hazardous voltages; fuses and circuit breakers; grounding; lightning protection; battery safety; electrical code compliance
Section T9A Antennas: vertical and horizontal polarization; concept of gain; common portable and mobile antennas; relationships between antenna length and frequency