B-006-02: Balanced and unbalanced feed lines, baluns
B-006-02-01:
What is a coaxial cable?
A center wire inside an insulating material which is covered by a metal sleeve or shield
Two wires side-by-side in a plastic ribbon
Two wires side-by-side held apart by insulating rods
Two wires twisted around each other in a spiral
B-006-02-02:
What is parallel-conductor feed line?
Two wires side-by-side held apart by insulating rods
Two wires twisted around each other in a spiral
A center wire inside an insulating material which is covered by a metal sleeve or shield
A metal pipe which is as wide or slightly wider than a wavelength of the signal it carries
B-006-02-03:
What kind of antenna feed line is made of two conductors held apart by insulated rods?
Open-conductor ladder line
Coaxial cable
Twin lead in a plastic ribbon
Twisted pair
B-006-02-04:
What does the term "balun" mean?
Balanced to unbalanced
Balanced unloader
Balanced unmodulator
Balanced antenna network
B-006-02-05:
Where would you install a balun to feed a dipole antenna with 50-ohm coaxial cable?
Between the coaxial cable and the antenna
Between the transmitter and the coaxial cable
Between the antenna and the ground
Between the coaxial cable and the ground
B-006-02-06:
What is an unbalanced line?
Feed line with one conductor connected to ground
Feed line with neither conductor connected to ground
Feed line with both conductors connected to ground
Feed line with both conductors connected to each other
B-006-02-07:
What device can be installed to feed a balanced antenna with an unbalanced feed line?
A balun
A triaxial transformer
A wavetrap
A loading coil
B-006-02-08:
A flexible coaxial line contains:
braid and insulation around a central conductor
four or more conductors running parallel
only one conductor
two parallel conductors separated by spacers
B-006-02-09:
A balanced transmission line:
is made of two parallel wires
has one conductor inside the other
carries RF current on one wire only
is made of one conductor only
B-006-02-10:
A 75 ohm transmission line could be matched to the 300 ohm feedpoint of an antenna:
by using a 4 to 1 balun
with an extra 250 ohm resistor
by using a 4 to 1 trigatron
by inserting a diode in one leg of the antenna
B-006-02-11:
What kind of antenna feed line can be constructed using two conductors which are maintained a uniform distance apart using insulated spreaders?
600 ohm open-wire
Coaxial cable
75 ohm twin-lead
300 ohm twin-lead
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