B-006-13: Quad/loop antennas - types, dimensions, characteristics
B-006-13-01:
What is a cubical quad antenna?
Two or more parallel four-sided wire loops, each approximately one-electrical wavelength long
A center-fed wire 1/2-electrical wavelength long
A vertical conductor 1/4-electrical wavelength high, fed at the bottom
Four straight, parallel elements in line with each other, each approximately 1/2-electrical wavelength long
B-006-13-02:
What is a delta loop antenna?
A type of cubical quad antenna, except with triangular elements rather than square
A large copper ring or wire loop, used in direction finding
An antenna system made of three vertical antennas, arranged in a triangular shape
An antenna made from several triangular coils of wire on an insulating form
B-006-13-03:
Approximately how long is each side of a cubical quad antenna driven element for 21.4 MHz?
3.54 metres (11.7 feet)
0.36 metres (1.17 feet)
14.33 metres (47 feet)
143 metres (469 feet)
B-006-13-04:
Approximately how long is each side of a cubical quad antenna driven element for 14.3 MHz?
5.36 metres (17.6 feet)
21.43 metres (70.3 feet)
53.34 metres (175 feet)
7.13 metres (23.4 feet)
B-006-13-05:
Approximately how long is each leg of a symmetrical delta loop antenna driven element for 28.7 MHz?
3.5 metres (11.5 feet)
2.67 metres (8.75 feet)
7.13 metres (23.4 feet)
10.67 metres (35 feet)
B-006-13-06:
Which statement about two-element delta loops and quad antennas is true?
They compare favorably with a three-element Yagi
They perform very well only at HF
They are effective only when constructed using insulated wire
They perform poorly above HF
B-006-13-07:
Compared to a dipole antenna, what are the directional radiation characteristics of a cubical quad antenna?
The quad has more directivity in both horizontal and vertical planes
The quad has more directivity in the horizontal plane but less directivity in the vertical plane
The quad has less directivity in the horizontal plane but more directivity in the vertical plane
The quad has less directivity in both horizontal and vertical planes
B-006-13-08:
Moving the feed point of a multi-element quad antenna from a side parallel to the ground to a side perpendicular to the ground will have what effect?
It will change the antenna polarization from horizontal to vertical
It will change the antenna polarization from vertical to horizontal
It will significantly decrease the antenna feed point impedance
It will significantly increase the antenna feed point impedance
B-006-13-09:
What does the term "antenna front-to-back ratio" mean in reference to a delta loop antenna?
The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
The relative position of the driven element with respect to the reflectors and directors
The power radiated in the major radiation lobe compared to the power radiated 90 degrees away from that direction
The number of directors versus the number of reflectors
B-006-13-10:
The cubical "quad" or "quad" antenna consists of two or more square loops of wire. The driven element has an approximate overall length of:
one wavelength
three-quarters of a wavelength
two wavelengths
one-half wavelength
B-006-13-11:
The delta loop antenna consists of two or more triangular structures mounted on a boom. The overall length of the driven element is approximately:
one wavelength
one-quarter of a wavelength
two wavelengths
one-half of a wavelength
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