Canadian Basic pool, section 6-13

Basic

This is an old (expired) question pool. Click here to go to the current version

Subelement 6

Feedlines and Antenna Systems

Section 6-13

quad/loop antennas - types, dimensions, characteristics

6-13-01

What is a cubical quad antenna?

A.
A center-fed wire 1/2-electrical wavelength long
B.
A vertical conductor 1/4- electrical wavelength high, fed at the bottom
Correct Answer
C.
Two or more parallel four- sided wire loops, each approximately one-electrical wavelength long
D.
Four straight, parallel elements in line with each other, each approximately 1/2- electrical wavelength long

6-13-01

This question does not yet have an explanation! Register to add one

Tags: none

6-13-02

What is a delta loop antenna?

Correct Answer
A.
A type of cubical quad antenna, except with triangular elements rather than square
B.
A large copper ring or wire loop, used in direction finding
C.
An antenna system made of three vertical antennas, arranged in a triangular shape
D.
An antenna made from several triangular coils of wire on an insulating form

6-13-02

This question does not yet have an explanation! Register to add one

Tags: none

6-13-03

Approximately how long is each side of a cubical quad antenna driven element for 21.4 MHz?

Correct Answer
A.
3.54 metres (11.7 feet)
B.
0.36 metres (1.17 feet)
C.
14.33 metres (47 feet)
D.
143 metres (469 feet)

6-13-03

This question does not yet have an explanation! Register to add one

Tags: none

6-13-04

Approximately how long is each side of a cubical quad antenna driven element for 14.3 MHz?

A.
21.43 metres (70.3 feet)
Correct Answer
B.
5.36 metres (17.6 feet)
C.
53.34 metres (175 feet)
D.
7.13 metres (23.4 feet)

6-13-04

This question does not yet have an explanation! Register to add one

Tags: none

6-13-05

Approximately how long is each leg of a symmetrical delta loop antenna driven element for 28.7 MHz?

A.
2.67 metres (8.75 feet)
B.
7.13 metres (23.4 feet)
C.
10.67 metres (35 feet)
Correct Answer
D.
3.5 metres (11.5 feet)

6-13-05

This question does not yet have an explanation! Register to add one

Tags: none

6-13-06

Which statement about two- element delta loops and quad antennas is true?

A.
They perform very well only at HF
Correct Answer
B.
They compare favorably with a threeelement Yagi
C.
They are effective only when constructed using insulated wire
D.
They perform poorly above HF

6-13-06

This question does not yet have an explanation! Register to add one

Tags: none

6-13-07

Compared to a dipole antenna, what are the directional radiation characteristics of a cubical quad antenna?

Correct Answer
A.
The quad has more directivity in both horizontal and vertical planes
B.
The quad has more directivity in the horizontal plane but less directivity in the vertical plane
C.
The quad has less directivity in the horizontal plane but more directivity in the vertical plane
D.
The quad has less directivity in both horizontal and vertical planes

6-13-07

This question does not yet have an explanation! Register to add one

Tags: none

6-13-08

Moving the feed point of a multielement quad antenna from a side parallel to the ground to a side perpendicular to the ground will have what effect?

A.
It will change the antenna polarization from vertical to horizontal
B.
It will significantly decrease the antenna feed point impedance
Correct Answer
C.
It will change the antenna polarization from horizontal to vertical
D.
It will significantly increase the antenna feed point impedance

6-13-08

This question does not yet have an explanation! Register to add one

Tags: none

6-13-09

What does the term "antenna front-toback ratio" mean in reference to a delta loop antenna?

A.
The relative position of the driven element with respect to the reflectors and directors
Correct Answer
B.
The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
C.
The power radiated in the major radiation lobe compared to the power radiated 90 degrees away from that direction
D.
The number of directors versus the number of reflectors

6-13-09

This question does not yet have an explanation! Register to add one

Tags: none

6-13-10

The cubical "quad" or "quad" antenna consists of two or more square loops of wire. The driven element has an approximate overall length of:

A.
three-quarters of a wavelength
Correct Answer
B.
one wavelength
C.
two wavelengths
D.
one-half wavelength

6-13-10

This question does not yet have an explanation! Register to add one

Tags: none

6-13-11

The delta loop antenna consists of two or more triangular structures mounted on a boom. The overall length of the driven element is approximately:

A.
one-quarter of a wavelength
Correct Answer
B.
one wavelength
C.
two wavelengths
D.
one-half of a wavelength

6-13-11

This question does not yet have an explanation! Register to add one

Tags: none

Log in

- or -

- or -