Canadian Basic Qualification pool, section B-006-002

Subelement B-006

B-006

Section B-006-002

B-006-002-001

What kind of transmission line has a centre wire inside an insulating material that is covered by a metal shield or sleeve?

Correct Answer
A.
Coaxial cable
B.
Window line
C.
Waveguide
D.
Open-wire line

B-006-002-001

Coaxial: two concentric conductors, an inner conductor, a dielectric (insulator) and an outer conductor (braided or solid). 'Window line' (a type of parallel line) looks like a ribbon. 'Open wire line' or 'ladder line' (a type of parallel line) uses insulating rods. [ 'Twisted pair' is very rarely used in radio work. ]

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-002

What kind of transmission line has two wires side-by-side embedded in insulating material?

A.
Open-wire line
B.
Coaxial cable
C.
Waveguide
Correct Answer
D.
Window line

B-006-002-002

"Two wires held apart by insulating rods (spacers or 'spreaders')" is also known as 'open wire line' or 'ladder line'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-003

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

A.
Window line
Correct Answer
B.
Open-wire line
C.
Twisted pair
D.
Coaxial cable

B-006-002-003

"Two wires held apart by insulating rods (spacers or 'spreaders')" is also known as 'open wire line' or 'ladder line'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-004

What is the purpose of a balun?

Correct Answer
A.
Connect balanced and unbalanced systems
B.
Balance antenna impedance
C.
Shunt common-mode current to ground
D.
Increase antenna gain

B-006-002-004

"Balun" is the contraction of "BALanced to UNbalanced". Dipole antennas and parallel lines operate in a BALanced mode (two conductors float above ground potential). A quarter-wave antenna, a ground-plane antenna and coaxial cable operate in an UNbalanced mode (with one side grounded). A BALUN interfaces balanced antenna to unbalanced transmission line OR balanced line to unbalanced line. A BALUN can also include impedance transformation.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-005

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

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

B-006-002-005

"Balun" is the contraction of "BALanced to UNbalanced". Dipole antennas and parallel lines operate in a BALanced mode (two conductors float above ground potential. A quarter-wave antenna, a ground-plane antenna and coaxial cable operate in an UNbalanced mode (with one side grounded). A BALUN interfaces balanced antenna to unbalanced transmission line OR balanced line to unbalanced line. A BALUN can also include impedance transformation.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-006

What causes a transmission line to be unbalanced?

Correct Answer
A.
One conductor is connected to ground
B.
The conductors are twisted together
C.
The conductors have deteriorated insulation
D.
One conductor has a poor connection at the antenna

B-006-002-006

Key word: UNBALANCED. An 'UNbalanced' transmission line functions with one conductor connected to ground (like coaxial cable or 'coax' for short). A 'balanced' transmission line operates with both conductors floating above ground potential (like all types of parallel lines: window line, open-wire line).

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-007

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

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

B-006-002-007

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-008

What device should you use to connect a coaxial cable to window line?

A.
A surge suppressor
B.
A phasing harness
C.
A tuning stub
Correct Answer
D.
A balun

B-006-002-008

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-009

A balanced transmission line:

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

B-006-002-009

Key word: BALANCED. A 'balanced' transmission line operates with both conductors floating above ground potential (like all types of parallel lines: window line, open-wire line). An 'UNbalanced' transmission line functions with one conductor connected to ground (like coaxial cable or 'coax' for short).

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-010

Your antenna tuner does not have a balanced output and you wish to use window line to feed an HF antenna. What device should you use between the tuner and the transmission line?

A.
Quarter-wave transformer
Correct Answer
B.
Balun
C.
Autotransformer
D.
Transmission line stub

B-006-002-010

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-006-002-011

What kind of transmission line has two conductors maintained side by side, a constant distance apart, using insulated spreaders?

A.
Twisted pair
B.
Twin-lead
Correct Answer
C.
Open-wire line
D.
Coaxial cable

B-006-002-011

"Two wires held apart by insulating rods (spacers or 'spreaders')" is also known as 'open wire line' or 'ladder line'. 'Window line' is two conductors held apart in a plastic ribbon. Coaxial cable is two concentric conductors, an inner conductor, a dielectric (insulator) and an outer conductor (braided or solid).

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

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