Canadian Basic pool, section 6-04

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Subelement 6

Feedlines and Antenna Systems

Section 6-04

line losses by line type, length and frequency

6-04-01

Why should you use only good quality coaxial cable and connectors for a UHF antenna system?

A.
To keep television interference high
B.
To keep the power going to your antenna system from getting too high
C.
To keep the standing wave ratio of your antenna system high
Correct Answer
D.
To keep RF loss low

6-04-01

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6-04-02

What are some reasons to use parallelconductor feed line?

Correct Answer
A.
It will operate with a high SWR, and has less loss than coaxial cable
B.
It has low impedance, and will operate with a high SWR
C.
It will operate with a high SWR, and it works well when tied down to metal objects
D.
It has a low impedance, and has less loss than coaxial cable

6-04-02

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6-04-03

If your transmitter and antenna are 15 metres apart, but are connected by 65 metres of RG-58 coaxial cable, what should be done to reduce feed line loss?

A.
Shorten the excess cable so the feed line is an odd number of wavelengths long
Correct Answer
B.
Shorten the excess cable
C.
Roll the excess cable into a coil which is as small as possible
D.
Shorten the excess cable so the feed line is an even number of wavelengths long

6-04-03

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6-04-04

As the length of a feed line is changed, what happens to signal loss?

A.
Signal loss decreases as length increases
Correct Answer
B.
Signal loss increases as length increases
C.
Signal loss is the least when the length is the same as the signal's wavelength
D.
Signal loss is the same for any length of feed line

6-04-04

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6-04-05

As the frequency of a signal is changed, what happens to signal loss in a feed line?

A.
Signal loss increases with decreasing frequency
Correct Answer
B.
Signal loss increases with increasing frequency
C.
Signal loss is the least when the signal's wavelength is the same as the feed line's length
D.
Signal loss is the same for any frequency

6-04-05

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6-04-06

Losses occurring on a transmission line between transmitter and antenna results in:

A.
an SWR reading of 1:1
Correct Answer
B.
less RF power being radiated
C.
reflections occurring in the line
D.
the wire radiating RF energy

6-04-06

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6-04-07

The lowest loss feed line on HF is:

Correct Answer
A.
open-wire
B.
75 ohm twin-lead
C.
coaxial cable
D.
300 ohm twin-lead

6-04-07

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6-04-08

In what values are RF feed line losses expressed?

A.
ohms per MHz
B.
dB per MHz
C.
ohms per metre
Correct Answer
D.
dB per unit length

6-04-08

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6-04-09

If the length of coaxial feed line is increased from 20 metres (65.6 ft) to 40 metres (131.2 ft), how would this affect the line loss?

Correct Answer
A.
It would be increased by 100%
B.
It would be reduced by 10%
C.
It would be increased by 10%
D.
It would be reduced to 50%

6-04-09

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6-04-10

If the frequency is increased, how would this affect the loss on a transmission line?

A.
It is independent of frequency
B.
It would increase
C.
It depends on the line length
Correct Answer
D.
It would decrease

6-04-10

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