Canadian Basic Qualification pool, section B-006-003

Subelement B-006

B-006

Section B-006-003

B-006-003-001

A transmission line must be supported for several metres by attaching it to a metal fence. What type of transmission line will NOT be adversely affected by proximity to the fence?

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

B-006-003-001

Coaxial cable, with its shielded and grounded outer conductor, is not affected by nearby metallic objects.

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

Tags: none

B-006-003-002

A common-mode current choke can be made by winding coaxial cable on a ferrite toroid. Why is cable with solid dielectric preferred over foam dielectric?

Correct Answer
A.
Less risk of a short due to centre conductor movement
B.
More impedance to common-mode current
C.
More flexible and easier to handle
D.
Less impedance inserted in the signal path

B-006-003-002

A centre conductor enclosed in foam could easily move, especially with a small bending radius.

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

Tags: none

B-006-003-003

Why do most amateur radio antenna systems use coaxial cable, rather than other types of transmission line?

A.
More power handling capability
B.
Less loss
Correct Answer
C.
More usable in a wide variety of settings
D.
Less expensive

B-006-003-003

Despite higher losses than parallel lines, the characteristic impedance of coaxial cable is suitable for most antennas and its outside shielding makes it simple to use.

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

Tags: none

B-006-003-004

What type of connector is commonly installed on RG-213 coaxial cable for connection to an HF transceiver?

A.
A BNC connector
B.
An F-type connector
Correct Answer
C.
A PL-259 connector
D.
An SMA connector

B-006-003-004

'RG-213' is the catalogue designation of common 10 mm (0.405 in.) coaxial cable. 'PL-259' is the catalogue designation of the male connector, which matches the output connector found on MF/HF (Medium Frequency/High Frequency) transceivers. The 'SMA' connector is found on modern compact handheld transceivers. The 'Type-N' connector is moisture resistant and the connector of choice above 300 MHz. The 'BNC' connector is commonly used for low-power transceivers and test instruments.

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

Tags: none

B-006-003-005

What type of connector usually joins a modern hand-held transceiver to its antenna?

A.
A PL-259 connector
B.
An F-type connector
C.
An RCA connector
Correct Answer
D.
An SMA connector

B-006-003-005

The 'SMA' connector is found on modern compact handheld transceivers. The 'BNC' connector is commonly used for low-power transceivers and test instruments. 'PL-259' is the catalogue designation of the male connector, which matches the output connector found on MF/HF (Medium Frequency/High Frequency) transceivers. The PL-259 connector fits on 10 mm (0.405 in.) coaxial cable such as RG-213. The 'Type-N' is moisture resistant and the connector of choice above 300 MHz.

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

Tags: none

B-006-003-006

Which popular RF connector is designed to be moisture resistant?

Correct Answer
A.
N
B.
BNC
C.
UHF
D.
SMA

B-006-003-006

The 'Type-N' connector is moisture resistant and the connector of choice above 300 MHz. The 'BNC' connector is commonly used for low-power transceivers and test instruments. 'PL-259' is the catalogue designation of the male connector, which matches the output connector found on MF/HF (Medium Frequency/High Frequency) transceivers. The 'SMA' connector is found on modern compact handheld transceivers.

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

Tags: none

B-006-003-007

What type of RF connector is commonly used for low-power transceivers and test instruments?

A.
RCA
B.
UHF
Correct Answer
C.
BNC
D.
N

B-006-003-007

'RG-213' is the coaxial with the largest diameter (10 mm or 0.405 in.) in this group. It has the lowest loss per 30 m length.

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

Tags: none

B-006-003-008

Why should you regularly clean and tighten all antenna connectors?

Correct Answer
A.
To help keep their contact resistance at a minimum
B.
To maintain lightning protection
C.
To prevent static electricity buildup
D.
To minimize dielectric losses

B-006-003-008

Poor connections can also lead to intermittent electrical contact (evidenced by an erratic or 'jumpy' Standing Wave Ratio (SWR) reading at the station).

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

Tags: none

B-006-003-009

What type of coaxial outer conductor offers the best shielding?

A.
Aluminum foil
B.
Single braided shield
C.
Double braided shield
Correct Answer
D.
Solid shield

B-006-003-009

Unsurprisingly, a more or less flexible metallic tube makes for the best shielding.

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

Tags: none

B-006-003-010

If your location is frequently affected by icing conditions, which type of transmission line would be the most suitable?

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

B-006-003-010

Coaxial cable, with its grounded outer conductor, is not affected by nearby metallic objects or atmospheric conditions.

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

Tags: none

B-006-003-011

What is the primary advantage of choosing a coaxial cable with a foam dielectric instead of a solid dielectric?

A.
Lower velocity factor
B.
Better mechanical stability
C.
Higher power handling
Correct Answer
D.
Lower loss

B-006-003-011

Foam dielectric is created by the injection of microscopic air bubbles. For a given outside diameter, using a dielectric with less density permits a larger diameter of the centre conductor. This results in lower losses.

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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