Canadian Basic pool, section 6-02

Basic

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Subelement 6

Feedlines and Antenna Systems

Section 6-02

balanced and unbalanced feed lines, baluns

6-02-01

What is a coaxial cable?

A.
Two wires side-by-side in a plastic ribbon
B.
Two wires side-by-side held apart by insulating rods
C.
Two wires twisted around each other in a spiral
Correct Answer
D.
A center wire inside an insulating material which is covered by a metal sleeve or shield

6-02-01

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6-02-02

What is parallel-conductor feed line?

A.
Two wires twisted around each other in a spiral
B.
A center wire inside an insulating material which is covered by a metal sleeve or shield
C.
A metal pipe which is as wide or slightly wider than a wavelength of the signal it carries
Correct Answer
D.
Two wires side-by-side held apart by insulating rods

6-02-02

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6-02-03

What kind of antenna feed line is made of two conductors held apart by insulated rods?

Correct Answer
A.
Open-conductor ladder line
B.
Coaxial cable
C.
Twin lead in a plastic ribbon
D.
Twisted pair

6-02-03

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6-02-04

What does the term "balun" mean?

A.
Balanced unloader
Correct Answer
B.
Balanced to unbalanced
C.
Balanced unmodulator
D.
Balanced antenna network

6-02-04

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6-02-05

Where would you install a balun to feed a dipole antenna with 50-ohm coaxial cable?

Correct Answer
A.
Between the coaxial cable and the antenna
B.
Between the transmitter and the coaxial cable
C.
Between the antenna and the ground
D.
Between the coaxial cable and the ground

6-02-05

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6-02-06

What is an unbalanced line?

A.
Feed line with neither conductor connected to ground
B.
Feed line with both conductors connected to ground
C.
Feed line with both conductors connected to each other
Correct Answer
D.
Feed line with one conductor connected to ground

6-02-06

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6-02-07

What device can be installed to feed a balanced antenna with an unbalanced feed line?

A.
A triaxial transformer
Correct Answer
B.
A balun
C.
A wavetrap
D.
A loading coil

6-02-07

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6-02-08

A flexible coaxial line contains:

A.
four or more conductors running parallel
B.
only one conductor
Correct Answer
C.
braid and insulation around a central conductor
D.
two parallel conductors separated by spacers

6-02-08

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6-02-09

A balanced transmission line:

Correct Answer
A.
is made of two parallel wires
B.
has one conductor inside the other
C.
carries RF current on one wire only
D.
is made of one conductor only

6-02-09

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6-02-10

A 75 ohm transmission line could be matched to the 300 ohm feedpoint of an antenna:

A.
with an extra 250 ohm resistor
Correct Answer
B.
by using a 4 to 1 balun
C.
by using a 4 to 1 trigatron
D.
by inserting a diode in one leg of the antenna

6-02-10

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6-02-11

What kind of antenna feed line can be constructed using two conductors which are maintained a uniform distance apart using insulated spreaders?

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

6-02-11

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