subelement g9 antennas and feedlines [4 exam questions–4 groups] antennas & feedlines1
TRANSCRIPT
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SUBELEMENT G9 ANTENNAS AND FEEDLINES
[4 Exam Questions–4 Groups]
Antennas & Feedlines 1
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SUBELEMENT G9 ANTENNAS AND FEEDLINES
[4 Exam Questions–4 Groups]
G9A - Antenna feed lines; characteristic impedance, and attenuation; SWR calculation,
measurement and effects; matching networks
G9B - Basic antennasG9C - Directional antennasG9D - Specialized antennas
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G9 - Antennas 3
FeedlineFeedliness
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G9 - Antennas 4
Standing Waves
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G9A01 - Which of the following factors determine the characteristic impedance of a parallel conductor
antenna feed line?A. The distance between the centers of the conductors and the radius of the conductorsB. The distance between the centers of the conductors and the length of the lineC. The radius of the conductors and the frequency of the signalD. The frequency of the signal and the length of the line
5Antennas & Feedlines
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G9A01 - Which of the following factors determine the characteristic impedance of a parallel conductor
antenna feed line?A. The distance between the centers of A. The distance between the centers of the conductors and the radius of the the conductors and the radius of the conductorsconductorsB. The distance between the centers of the conductors and the length of the lineC. The radius of the conductors and the frequency of the signalD. The frequency of the signal and the length of the line
6Antennas & Feedlines
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G9A02 - What are the typical characteristic impedances of coaxial cables used for antenna feed lines at
amateur stations?
A. 25 and 30 ohmsB. 50 and 75 ohmsC. 80 and 100 ohmsD. 500 and 750 ohms
7Antennas & Feedlines
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G9A02 - What are the typical characteristic impedances of coaxial cables used for antenna feed lines at
amateur stations?
A. 25 and 30 ohms
B. 50 and 75 ohmsB. 50 and 75 ohmsC. 80 and 100 ohmsD. 500 and 750 ohms
8Antennas & Feedlines
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G9A03 - What is the characteristic impedance of flat ribbon TV type
twinlead?
A. 50 ohmsB. 75 ohmsC. 100 ohmsD. 300 ohms
9Antennas & Feedlines
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G9A03 - What is the characteristic impedance of flat ribbon TV type
twinlead?
A. 50 ohmsB. 75 ohmsC. 100 ohms
D. 300 ohmsD. 300 ohms
10Antennas & Feedlines
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G9A04 - What might cause reflected power at the point where a
feed line connects to an antenna?
A. Operating an antenna at its resonant frequencyB. Using more transmitter power than the antenna can handleC. A difference between feed line impedance and antenna feed point impedanceD. Feeding the antenna with unbalanced feed line
11Antennas & Feedlines
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G9A04 - What might cause reflected power at the point where a
feed line connects to an antenna?
A. Operating an antenna at its resonant frequencyB. Using more transmitter power than the antenna can handle
C. A difference between feed line C. A difference between feed line impedance and antenna feed point impedance and antenna feed point impedanceimpedanceD. Feeding the antenna with unbalanced feed line
12Antennas & Feedlines
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G9A05 - How does the attenuation of coaxial cable change as the
frequency of the signal it is carrying increases?
A. Attenuation is independent of frequencyB. Attenuation increasesC. Attenuation decreasesD. Attenutation reaches a maximum at approximately 18 MHz
13Antennas & Feedlines
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G9 - Antennas 14
Coax Cable Signal Loss (Attenuation) in dB per 100ft
Loss RG-174 RG-58 RG-8X RG-213 RG-6 RG-11 9913 LMR-400
1MHz 1.9dB 0.4dB 0.5dB 0.2dB 0.2dB 0.2dB 0.2dB 0.3dB
10MHz 3.3dB 1.4dB 1.0dB 0.6dB 0.6dB 0.4dB 0.4dB 0.5dB
50MHz 6.6dB 3.3dB 2.5dB 1.6dB 1.4dB 1.0dB 0.9dB 0.9dB
100MHz 8.9dB 4.9dB 3.6dB 2.2dB 2.0dB 1.6dB 1.4dB 1.4dB
200MHz 11.9dB 7.3dB 5.4dB 3.3dB 2.8dB 2.3dB 1.8dB 1.8dB
400MHz 17.3dB 11.2dB 7.9dB 4.8dB 4.3dB 3.5dB 2.6dB 2.6dB
700MHz 26.0dB 16.9dB 11.0dB 6.6dB 5.6dB 4.7dB 3.6dB 3.5dB
900MHz 27.9dB 20.1dB 12.6dB 7.7dB 6.0dB 5.4dB 4.2dB 3.9dB
1GHz 32.0dB 21.5dB 13.5dB 8.3dB 6.1dB 5.6dB 4.5dB 4.1dB
Imped 50ohm 50ohm 50ohm 50ohm 75ohm 75ohm 50ohm 50ohm
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G9A05 - How does the attenuation of coaxial cable change as the
frequency of the signal it is carrying increases?
A. Attenuation is independent of frequency
B. Attenuation increasesB. Attenuation increasesC. Attenuation decreasesD. Attenutation reaches a maximum at approximately 18 MHz
15Antennas & Feedlines
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G9A06 - In what units is RF feed line loss usually expressed?
A. Ohms per 1000 feetB. Decibels per 1000 feetC. Ohms per 100 feetD. Decibels per 100 feet
16Antennas & Feedlines
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G9A06 - In what units is RF feed line loss usually expressed?
A. Ohms per 1000 feetB. Decibels per 1000 feetC. Ohms per 100 feet
D. Decibels per 100 feetD. Decibels per 100 feet
17Antennas & Feedlines
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G9A07 - What must be done to prevent standing waves on an
antenna feed line?A. The antenna feed point must be at DC ground potentialB. The feed line must be cut to a length equal to an odd number of electrical quarter wavelengths C. The feed line must be cut to a length equal to an even number of physical half wavelengths D. The antenna feed point impedance must be matched to the characteristic impedance of the feed line
18Antennas & Feedlines
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G9A07 - What must be done to prevent standing waves on an
antenna feed line?A. The antenna feed point must be at DC ground potentialB. The feed line must be cut to a length equal to an odd number of electrical quarter wavelengths C. The feed line must be cut to a length equal to an even number of physical half wavelengths
D. The antenna feed point impedance D. The antenna feed point impedance must be matched to the must be matched to the characteristic impedance of the feed characteristic impedance of the feed lineline
19Antennas & Feedlines
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G9A08 - If the SWR on an antenna feed line is 5 to 1, and a matching network at
the transmitter end of the feed line is adjusted to 1 to 1 SWR, what is the
resulting SWR on the feed line?
A. 1 to 1B. 5 to 1C. Between 1 to 1 and 5 to 1 depending on the characteristic impedance of the lineD. Between 1 to 1 and 5 to 1 depending on the reflected power at the transmitter
20Antennas & Feedlines
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G9A08 - If the SWR on an antenna feed line is 5 to 1, and a matching network at
the transmitter end of the feed line is adjusted to 1 to 1 SWR, what is the
resulting SWR on the feed line?
A. 1 to 1
B. 5 to 1B. 5 to 1C. Between 1 to 1 and 5 to 1 depending on the characteristic impedance of the lineD. Between 1 to 1 and 5 to 1 depending on the reflected power at the transmitter
21Antennas & Feedlines
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G9A09 - What standing wave ratio will result when connecting a 50
ohm feed line to a non-reactive load having 200 ohm impedance?
A. 4:1B. 1:4C. 2:1D. 1:2
22Antennas & Feedlines
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G9A09 - What standing wave ratio will result when connecting a 50
ohm feed line to a non-reactive load having 200 ohm impedance?
A. 4:1A. 4:1B. 1:4C. 2:1D. 1:2
23Antennas & Feedlines
200 / 50 = 4 to 1 or 4:14 to 1 or 4:1
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G9A10 - What standing wave ratio will result when connecting a 50
ohm feed line to a non-reactive load having 10 ohm impedance?
A. 2:1B. 50:1C. 1:5D. 5:1
24Antennas & Feedlines
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G9A10 - What standing wave ratio will result when connecting a 50
ohm feed line to a non-reactive load having 10 ohm impedance?
A. 2:1B. 50:1C. 1:5
D. 5:1D. 5:1
25Antennas & Feedlines
50 / 10 = 50 / 10 = 5 to 1 or 5:15 to 1 or 5:1
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G9A11 - What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 50
ohm impedance?
A. 2:1B. 1:1C. 50:50D. 0:0
26Antennas & Feedlines
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G9A11 - What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 50
ohm impedance?
A. 2:1
B. 1:1B. 1:1C. 50:50D. 0:0
27Antennas & Feedlines
50 / 50 = 50 / 50 = 1 to 1 or 1:11 to 1 or 1:1
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G9A12 - What standing wave ratio will result when connecting a 50
ohm feed line to a non-reactive load having 25 ohm impedance?
A. 2:1B. 2.5:1C. 1.25:1D. You cannot determine SWR from impedance values
28Antennas & Feedlines
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G9A12 - What standing wave ratio will result when connecting a 50
ohm feed line to a non-reactive load having 25 ohm impedance?
A. 2:1A. 2:1B. 2.5:1C. 1.25:1D. You cannot determine SWR from impedance values
29Antennas & Feedlines
Larger number always firstLarger number always first50 / 25 = 50 / 25 = 2 to 2 or 2:12 to 2 or 2:1
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G9A13 - What standing wave ratio will result when connecting a 50
ohm feed line to an antenna that has a purely resistive 300 ohm feed
point impedance?
A. 1.5:1B. 3:1C. 6:1D. You cannot determine SWR from impedance values
30Antennas & Feedlines
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G9A13 - What standing wave ratio will result when connecting a 50
ohm feed line to an antenna that has a purely resistive 300 ohm feed
point impedance?
A. 1.5:1B. 3:1
C. 6:1C. 6:1D. You cannot determine SWR from impedance values
31Antennas & Feedlines
300 / 50 = 300 / 50 = 6 to 1 or 6:16 to 1 or 6:1
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G9A14 - What is the interaction between high standing wave ratio ( SWR ) and transmission line loss?
A. There is no interaction between transmission line loss and SWRB. If a transmission line is lossy, high SWR will increase the loss C. High SWR makes it difficult to measure transmission line lossD. High SWR reduces the relative effect of transmission line loss
32Antennas & Feedlines
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G9A14 - What is the interaction between high standing wave ratio ( SWR ) and transmission line loss?
A. There is no interaction between transmission line loss and SWR
B. If a transmission line is lossy, high B. If a transmission line is lossy, high SWR will increase the loss SWR will increase the loss C. High SWR makes it difficult to measure transmission line lossD. High SWR reduces the relative effect of transmission line loss
33Antennas & Feedlines
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G9A15 - What is the effect of transmission line loss on SWR measured
at the input to the line?
A. The higher the transmission line loss, the more the SWR will read artificially lowB. The higher the transmission line loss, the more the SWR will read artificially highC. The higher the transmission line loss, the more accurate the SWR measurement will beD. Transmission line loss does not affect the SWR measurement
34Antennas & Feedlines
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G9A15 - What is the effect of transmission line loss on SWR measured
at the input to the line?
A. The higher the transmission line A. The higher the transmission line loss, the more the SWR will read loss, the more the SWR will read artificially lowartificially lowB. The higher the transmission line loss, the more the SWR will read artificially highC. The higher the transmission line loss, the more accurate the SWR measurement will beD. Transmission line loss does not affect the SWR measurement
35Antennas & Feedlines
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G9B - Basic antennas
36Antennas & Feedlines
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G9B01 - What is one disadvantage of a directly fed random-wire HF
antenna?
A. It must be longer than 1 wavelength B. You may experience RF burns when touching metal objects in your station C. It produces only vertically polarized radiationD. It is more effective on the lower HF bands than on the higher bands
37Antennas & Feedlines
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G9B01 - What is one disadvantage of a directly fed random-wire HF
antenna?
A. It must be longer than 1 wavelength
B. You may experience RF burns B. You may experience RF burns when touching metal objects in your when touching metal objects in your station station C. It produces only vertically polarized radiationD. It is more effective on the lower HF bands than on the higher bands
38Antennas & Feedlines
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G9 - Antennas 39
Vertical Antennas(Quarter Wavelength Vertical)
Ground Plane
Ground Plane
Ground
Marconi
Radials
Wavelength (meters) = Wavelength (meters) = 300 300 F (MHz)F (MHz)
¼¼λλ vertical length (inches) = Wavelength / 4 x 39 vertical length (inches) = Wavelength / 4 x 39
Quarter wavelength
Meters to inches
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G9 - Antennas 40
Vertical Antenna
Standard ¼ wave vertical has a feedpoint impedance of ~35 ohms
Sloping ground radials downward raises feedpoint impedance
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G9B02 - Which of the following is a common way to adjust the feed
point impedance of a quarter wave ground plane vertical antenna to be
approximately 50 ohms?
A. Slope the radials upwardB. Slope the radials downwardC. Lengthen the radialsD. Shorten the radials
41Antennas & Feedlines
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G9B02 - Which of the following is a common way to adjust the feed
point impedance of a quarter wave ground plane vertical antenna to be
approximately 50 ohms?
A. Slope the radials upward
B. Slope the radials downwardB. Slope the radials downwardC. Lengthen the radialsD. Shorten the radials
42Antennas & Feedlines
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G9B03 - What happens to the feed point impedance of a ground plane
antenna when its radials are changed from horizontal to sloping
downward?A. It decreasesB. It increasesC. It stays the sameD. It reaches a maximum at an angle of 45 degrees
43Antennas & Feedlines
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G9B03 - What happens to the feed point impedance of a ground plane
antenna when its radials are changed from horizontal to sloping
downward?A. It decreases
B. It increasesC. It stays the sameD. It reaches a maximum at an angle of 45 degrees
44Antennas & Feedlines
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G9 - Antennas 45
½ λ Dipole Radiation
Radiation pattern for a dipole placed ½ λabove ground looking down from above the antenna.
Looks like a doughnut around the wire in 3D space.
Pattern distorts to omnidirectional when placed low to the ground.
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G9B04 - What is the radiation pattern of a dipole antenna in free
space in the plane of the conductor?
A. It is a figure-eight at right angles to the antennaB. It is a figure-eight off both ends of the antennaC. It is a circle (equal radiation in all directions)D. It has a pair of lobes on one side of the antenna and a single lobe on the other side
46Antennas & Feedlines
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G9B04 - What is the radiation pattern of a dipole antenna in free
space in the plane of the conductor?
A. It is a figure-eight at right angles to A. It is a figure-eight at right angles to the antennathe antennaB. It is a figure-eight off both ends of the antennaC. It is a circle (equal radiation in all directions)D. It has a pair of lobes on one side of the antenna and a single lobe on the other side
47Antennas & Feedlines
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G9B05 - How does antenna height affect the horizontal ( azimuthal ) radiation pattern of a horizontal
dipole HF antenna?
A. If the antenna is too high, the pattern becomes unpredictableB. Antenna height has no effect on the patternC. If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectionalD. If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated
48Antennas & Feedlines
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49Antennas & Feedlines
G9B05 - How does antenna height affect the horizontal ( azimuthal ) radiation pattern of a horizontal
dipole HF antenna?
AntennaHeightAbove Ground
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G9B05 - How does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal
dipole HF antenna?
A. If the antenna is too high, the pattern becomes unpredictableB. Antenna height has no effect on the pattern
C. If the antenna is less than 1/2 C. If the antenna is less than 1/2 wavelength high, the azimuthal wavelength high, the azimuthal pattern is almost omnidirectionalpattern is almost omnidirectionalD. If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated
50Antennas & Feedlines
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G9B06 - Where should the radial wires of a ground-mounted vertical antenna
system be placed?
A. As high as possible above the groundB. Parallel to the antenna elementC. On the surface of the Earth or buried a few inches below the groundD. At the center of the antenna
51Antennas & Feedlines
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G9B06 - Where should the radial wires of a ground-mounted vertical antenna
system be placed?
A. As high as possible above the groundB. Parallel to the antenna element
C. On the surface of the Earth C. On the surface of the Earth or buried a few inches below or buried a few inches below the groundthe groundD. At the center of the antenna
52Antennas & Feedlines
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Ground Radials
53Antennas & Feedlines
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G9B07 - How does the feed point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below
1/4 wave above ground?
A. It steadily increasesB. It steadily decreasesC. It peaks at about 1/8 wavelength above groundD. It is unaffected by the height above ground
54Antennas & Feedlines
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G9B07 - How does the feed point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below
1/4 wave above ground?
A. It steadily increases
B. It steadily decreasesB. It steadily decreasesC. It peaks at about 1/8 wavelength above groundD. It is unaffected by the height above ground
55Antennas & Feedlines
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G9B08 - How does the feed point impedance of a 1/2 wave dipole change
as the feed point is moved from the center toward the ends?
A. It steadily increasesB. It steadily decreasesC. It peaks at about 1/8 wavelength from the endD. It is unaffected by the location of the feed point
56Antennas & Feedlines
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G9B08 - How does the feed point impedance of a 1/2 wave dipole change
as the feed point is moved from the center toward the ends?
A. It steadily increasesA. It steadily increasesB. It steadily decreasesC. It peaks at about 1/8 wavelength from the endD. It is unaffected by the location of the feed point
57Antennas & Feedlines
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G9B09 - Which of the following is an advantage of a horizontally polarized as
compared to a vertically polarized HF antenna?
A. Lower ground reflection losses B. Lower feed point impedanceC. Shorter RadialsD. Lower radiation resistance
58Antennas & Feedlines
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G9B09 - Which of the following is an advantage of a horizontally polarized as
compared to a vertically polarized HF antenna?
A. Lower ground reflection A. Lower ground reflection losseslosses
B. Lower feed point impedanceC. Shorter RadialsD. Lower radiation resistance
59Antennas & Feedlines
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G9B10 - What is the approximate length for a 1/2 wave dipole antenna
cut for 14.250 MHz?
A. 8 feetB. 16 feetC. 24 feetD. 32 feet
60Antennas & Feedlines
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Electrical Principles 2010 61
Meters Calculations
• Half wave• 21.0526 / 2 =21.0526 / 2 =• 10.5263 m10.5263 m• Meters to inches• 10.5263 x 39.37 10.5263 x 39.37 • = 414.42 inch= 414.42 inch• Inches to feet• 414.42 / 12414.42 / 12• = 34.535 feet= 34.535 feet• Velosity factor• 34.535 x .95• =32.8 feet
300300
f = f = 14.214.2
55
mm
meters = 300/14.250 = 21.0526 m
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G9B10 - What is the approximate length for a 1/2 wave dipole antenna
cut for 14.250 MHz?
A. 8 feetB. 16 feetC. 24 feet
D. 32 feet
62Antennas & Feedlines
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G9B11 - What is the approximate length for a 1/2 wave dipole antenna
cut for 3.550 MHz?
A. 42 feetB. 84 feetC. 131 feetD. 263 feet
63Antennas & Feedlines
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Electrical Principles 2010 64
Meters Calculations
• Half wave• 84.507 / 2 =84.507 / 2 =• 42.2535 m42.2535 m• Meters to inches• 42.2535 x 39.37 42.2535 x 39.37 • = 1663.52 inch= 1663.52 inch• Inches to feet• 1663.52 / 121663.52 / 12• = 138.627 feet= 138.627 feet• Velosity factor• 138.627 x .95138.627 x .95• =131.7 feet
300300
f = f = 3.553.55
00
mm
meters = 300/3.550 = 84.507 mmeters = 300/3.550 = 84.507 m
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G9B11 - What is the approximate length for a 1/2 wave dipole antenna
cut for 3.550 MHz?
A. 42 feetB. 84 feet
C. 131 feetC. 131 feetD. 263 feet
65Antennas & Feedlines
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G9B12 - What is the approximate length for a 1/4 wave vertical
antenna cut for 28.5 MHz?
A. 8 feetB. 11 feetC. 16 feetD. 21 feet
66Antennas & Feedlines
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Electrical Principles 2010 67
Meters Calculations
• Quarter wave• 10.5263 / 4 =10.5263 / 4 =• 2.63 m2.63 m• Meters to inches• 2.63 x 39.37 2.63 x 39.37 • = 103.605 inch= 103.605 inch• Inches to feet• 103.605 / 12103.605 / 12• = 8.63 feet= 8.63 feet• Velosity factor• 8.63 x .958.63 x .95• =8.2 feet
300300
f = f = 28.5028.50
00
mm
meters = 300/28.5 = 10.5263 mmeters = 300/28.5 = 10.5263 m
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G9B12 - What is the approximate length for a 1/4 wave vertical
antenna cut for 28.5 MHz?
A. 8 feetA. 8 feetB. 11 feetC. 16 feetD. 21 feet
68Antennas & Feedlines
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G9C - Directional antennas
69Antennas & Feedlines
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G9 - Antennas 70
Beam Antennas(Yagi Antenna)
GainGain
BoomBoom
Feed
line
Feed
line
Reflect
or
Reflect
or
Dir
ect
oD
irect
orr
Dri
ven
D
riven
Ele
men
tEle
men
t
The reflectorThe reflectoracts like a acts like a
mirrormirror
The directorThe directoracts like aacts like a
lenslens
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G9 - Antennas 71
Yagi Radiation Pattern
The yagi antenna focuses RF energy in one direction, giving the appearance ofgetting “free power.”
This free power or Effective Radiated Power (ERP) can be expressed as antenna Gain in Decibels (dB) over a dipole (dBd) or isotropic resonator (dBi).
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G9 - Antennas 72
Quad antenna
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G9 - Antennas 73
Delta Loop
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G9C01 - Which of the following would increase the bandwidth of a
Yagi antenna?
A. Larger diameter elementsB. Closer element spacingC. Loading coils in series with the elementD. Tapered-diameter elements
74Antennas & Feedlines
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G9C01 - Which of the following would increase the bandwidth of a
Yagi antenna?
A. Larger diameter elementsA. Larger diameter elementsB. Closer element spacingC. Loading coils in series with the elementD. Tapered-diameter elements
75Antennas & Feedlines
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G9C02 - What is the approximate length of the driven element of a
Yagi antenna?
A. 1/4 wavelengthB. 1/2 wavelengthC. 3/4 wavelengthD. 1 wavelength
76Antennas & Feedlines
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G9C02 - What is the approximate length of the driven element of a
Yagi antenna?
A. 1/4 wavelength
B. 1/2 wavelengthB. 1/2 wavelengthC. 3/4 wavelengthD. 1 wavelength
77Antennas & Feedlines
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G9C03 - Which statement about a three-element, single-band Yagi
antenna is true?
A. The reflector is normally the shortest elementB. The director is normally the shortest elementC. The driven element is the longest elementD. Low feed point impedance increases bandwidth
78Antennas & Feedlines
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G9C03 - Which statement about a three-element, single-band Yagi
antenna is true?
A. The reflector is normally the shortest element
B. The director is normally the shortest B. The director is normally the shortest elementelementC. The driven element is the longest elementD. Low feed point impedance increases bandwidth
79Antennas & Feedlines
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G9C04 - Which statement about a three-element, single-band Yagi
antenna is true?A. The reflector is normally the longest elementB. The director is normally the longest element C. The reflector is normally the shortest elementD. All of the elements must be the same length
80Antennas & Feedlines
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G9C04 - Which statement about a three-element, single-band Yagi
antenna is true?A. The reflector is normally the longest A. The reflector is normally the longest elementelementB. The director is normally the longest element C. The reflector is normally the shortest elementD. All of the elements must be the same length
81Antennas & Feedlines
20m Yagi20m Yagi
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20 Meter Yagi
82Antennas & Feedlines
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G9C05 - How does increasing boom length and adding directors affect a
Yagi antenna?
A. Gain increasesB. Beamwidth increasesC. Front to back ratio decreases D. Front to side ratio decreases
83Antennas & Feedlines
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G9C05 - How does increasing boom length and adding directors affect a
Yagi antenna?
A. Gain increasesA. Gain increasesB. Beamwidth increasesC. Front to back ratio decreases D. Front to side ratio decreases
84Antennas & Feedlines
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G9C06 - What configuration of the loops of a two-element quad antenna
must be used for the antenna to operate as a beam antenna, assuming one of the
elements is used as a reflector? A. The driven element must be fed with a balun transformerB. There must be an open circuit in the driven element at the point opposite the feed pointC. The reflector element must be approximately 5 percent shorter than the driven elementD. The reflector element must be approximately 5 percent longer than the driven element
85Antennas & Feedlines
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G9C06 - What configuration of the loops of a two-element quad antenna
must be used for the antenna to operate as a beam antenna, assuming one of the
elements is used as a reflector? A. The driven element must be fed with a balun transformerB. There must be an open circuit in the driven element at the point opposite the feed pointC. The reflector element must be approximately 5 percent shorter than the driven element
D. The reflector element must be D. The reflector element must be approximately 5 percent longer than approximately 5 percent longer than the driven elementthe driven element
86Antennas & Feedlines
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G9C07 - What does "front-to-back ratio" mean in reference to a Yagi
antenna?A. The number of directors versus the number of reflectorsB. The relative position of the driven element with respect to the reflectors and directorsC. The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite directionD. The ratio of forward gain to dipole gain
87Antennas & Feedlines
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G9C07 - What does "front-to-back ratio" mean in reference to a Yagi
antenna?A. The number of directors versus the number of reflectorsB. The relative position of the driven element with respect to the reflectors and directors
C. The power radiated in the major C. The power radiated in the major radiation lobe compared to the power radiation lobe compared to the power radiated in exactly the opposite radiated in exactly the opposite directiondirectionD. The ratio of forward gain to dipole gain
88Antennas & Feedlines
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Antenna Radiation Pattern Front to Back Ratio’s
89Antennas & Feedlines
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G9C08 - What is meant by the "main lobe" of a directive antenna?
A. The magnitude of the maximum vertical angle of radiationB. The point of maximum current in a radiating antenna elementC. The maximum voltage standing wave point on a radiating elementD. The direction of maximum radiated field strength from the antenna
90Antennas & Feedlines
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G9C08 - What is meant by the "main lobe" of a directive antenna?
A. The magnitude of the maximum vertical angle of radiationB. The point of maximum current in a radiating antenna elementC. The maximum voltage standing wave point on a radiating element
D. The direction of maximum radiated D. The direction of maximum radiated field strength from the antennafield strength from the antenna
91Antennas & Feedlines
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Antenna Radiation Patterns
92Antennas & Feedlines
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G9C09 - How does the gain of two 3-element horizontally polarized Yagi
antennas spaced vertically 1/2 wavelength apart typically compare to
the gain of a single 3-element Yagi?
A. Approximately 1.5 dB higherB. Approximately 3 dB higherC. Approximately 6 dB higherD. Approximately 9 dB higher
93Antennas & Feedlines
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G9C09 - How does the gain of two 3-element horizontally polarized Yagi
antennas spaced vertically 1/2 wavelength apart typically compare to
the gain of a single 3-element Yagi?
A. Approximately 1.5 dB higher
B. Approximately 3 dB higher. Approximately 3 dB higherC. Approximately 6 dB higherD. Approximately 9 dB higher
94Antennas & Feedlines
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G9C10 - Which of the following is a Yagi antenna design variable that
could be adjusted to optimize forward gain, front-to-back ratio, or
SWR bandwidth?
A. The physical length of the boomB. The number of elements on the boomC. The spacing of each element along the boomD. All of these choices are correct
95Antennas & Feedlines
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G9C10 - Which of the following is a Yagi antenna design variable that
could be adjusted to optimize forward gain, front-to-back ratio, or
SWR bandwidth?
A. The physical length of the boomB. The number of elements on the boomC. The spacing of each element along the boom
D. All of these choices are correctD. All of these choices are correct
96Antennas & Feedlines
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G9C11 - What is the purpose of a gamma match used with Yagi
antennas?
A. To match the relatively low feed point impedance to 50 ohmsB. To match the relatively high feed point impedance to 50 ohmsC. To increase the front-to-back ratioD. To increase the main lobe gain
97Antennas & Feedlines
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G9C11 - What is the purpose of a gamma match used with Yagi
antennas?
A. To match the relatively low feed A. To match the relatively low feed point impedance to 50 ohmspoint impedance to 50 ohmsB. To match the relatively high feed point impedance to 50 ohmsC. To increase the front-to-back ratioD. To increase the main lobe gain
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G9C12 - Which of the following is an advantage of using a gamma match for impedance matching of a Yagi antenna
to 50 ohm coax feed line?
A. It does not require that the elements be insulated from the boomB. It does not require any inductors or capacitorsC. It is useful for matching multiband antennasD. All of these choices are correct
99Antennas & Feedlines
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G9C12 - Which of the following is an advantage of using a gamma match for impedance matching of a Yagi antenna
to 50 ohm coax feed line?
A. It does not require that the A. It does not require that the elements be insulated from the boomelements be insulated from the boomB. It does not require any inductors or capacitorsC. It is useful for matching multiband antennasD. All of these choices are correct
100Antennas & Feedlines
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G9C13 - Approximately how long is each side of the driven element of a
quad antenna?
A. 1/4 wavelengthB. 1/2 wavelengthC. 3/4 wavelengthD. 1 wavelength
101Antennas & Feedlines
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G9C13 - Approximately how long is each side of the driven element of a
quad antenna?
A. 1/4 wavelengthA. 1/4 wavelengthB. 1/2 wavelengthC. 3/4 wavelengthD. 1 wavelength
102Antennas & Feedlines
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G9C14 - How does the forward gain of a two-element quad antenna compare to the forward gain of a three-element Yagi
antenna?
A. About 2/3 as muchB. About the sameC. About 1.5 times as muchD. About twice as much
103Antennas & Feedlines
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G9C14 - How does the forward gain of a two-element quad antenna compare to the forward gain of a three-element Yagi
antenna?
A. About 2/3 as much
B. About the sameB. About the sameC. About 1.5 times as muchD. About twice as much
104Antennas & Feedlines
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G9C15 - Approximately how long is each side of the reflector element of
a quad antenna?
A. Slightly less than 1/4 wavelengthB. Slightly more than 1/4 wavelengthC. Slightly less than 1/2 wavelengthD. Slightly more than 1/2 wavelength
105Antennas & Feedlines
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G9C15 - Approximately how long is each side of the reflector element of
a quad antenna?
A. Slightly less than 1/4 wavelength
B. Slightly more than 1/4 B. Slightly more than 1/4 wavelengthwavelengthC. Slightly less than 1/2 wavelengthD. Slightly more than 1/2 wavelength
106Antennas & Feedlines
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G9C16 - How does the gain of a two-element delta-loop beam compare to the gain of a two-
element quad antenna?
A. 3 dB higherB. 3 dB lowerC. 2.54 dB higherD. About the same
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G9C16 - How does the gain of a two-element delta-loop beam compare to the gain of a two-
element quad antenna?
A. 3 dB higherB. 3 dB lowerC. 2.54 dB higher
D. About the sameD. About the same
108Antennas & Feedlines
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G9C17 - Approximately how long is each leg of a symmetrical delta-loop
antenna?
A. 1/4 wavelengthB. 1/3 wavelengthC. 1/2 wavelengthD. 2/3 wavelength
109Antennas & Feedlines
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G9C17 - Approximately how long is each leg of a symmetrical delta-loop
antenna?
A. 1/4 wavelength
B. 1/3 wavelengthB. 1/3 wavelengthC. 1/2 wavelengthD. 2/3 wavelength
110Antennas & Feedlines
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G9C18 - What happens when the feed point of a quad antenna of any shape is moved from the midpoint of the top or bottom to the midpoint of
either side?A. The polarization of the radiated signal changes from horizontal to verticalB. The polarization of the radiated signal changes from vertical to horizontalC. There is no change in polarizationD. The radiated signal becomes circularly polarized
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G9C18 - What happens when the feed point of a quad antenna of any shape is moved from the midpoint of the top or bottom to the midpoint of
either side?A. The polarization of the radiated A. The polarization of the radiated signal changes from horizontal to signal changes from horizontal to verticalverticalB. The polarization of the radiated signal changes from vertical to horizontalC. There is no change in polarizationD. The radiated signal becomes circularly polarized
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G9C19 - How does antenna gain stated in dBi compare to gain stated
in dBd for the same antenna?
A. dBi gain figures are 2.15 dB lower then dBd gain figuresB. dBi gain figures are 2.15 dB higher than dBd gain figuresC. dBi gain figures are the same as the square root of dBd gain figures multiplied by 2.15D. dBi gain figures are the reciprocal of dBd gain figures + 2.15 dB
113Antennas & Feedlines
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G9C19 - How does antenna gain stated in dBi compare to gain stated
in dBd for the same antenna?
A. dBi gain figures are 2.15 dB lower then dBd gain figures
B. dBi gain figures are 2.15 dB B. dBi gain figures are 2.15 dB higher than dBd gain figureshigher than dBd gain figuresC. dBi gain figures are the same as the square root of dBd gain figures multiplied by 2.15D. dBi gain figures are the reciprocal of dBd gain figures + 2.15 dB
114Antennas & Feedlines
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G9C20 - What is meant by the terms dBi and dBd when referring
to antenna gain?A. dBi refers to an isotropic antenna, dBd refers to a dipole antennaB. dBi refers to an ionospheric reflecting antenna, dBd refers to a dissipative antennaC. dBi refers to an inverted-vee antenna, dBd refers to a downward reflecting antennaD. dBi refers to an isometric antenna, dBd refers to a discone antenna
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G9C20 - What is meant by the terms dBi and dBd when referring
to antenna gain?A. dBi refers to an isotropic antenna, A. dBi refers to an isotropic antenna, dBd refers to a dipole antennadBd refers to a dipole antennaB. dBi refers to an ionospheric reflecting antenna, dBd refers to a dissipative antennaC. dBi refers to an inverted-vee antenna, dBd refers to a downward reflecting antennaD. dBi refers to an isometric antenna, dBd refers to a discone antenna
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G9D - Specialized antennas
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G9D01 - What does the term NVIS mean as related to antennas?
A. Nearly Vertical Inductance SystemB. Non-Varying Indicated SWRC. Non-Varying Impedance SmoothingD. Near Vertical Incidence sky-wave
118Antennas & Feedlines
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G9D01 - What does the term NVIS mean as related to antennas?
A. Nearly Vertical Inductance SystemB. Non-Varying Indicated SWRC. Non-Varying Impedance Smoothing
D. Near Vertical Incidence sky-D. Near Vertical Incidence sky-wavewave
119Antennas & Feedlines
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G9D02 - Which of the following is an advantage of an NVIS antenna?
A. Low vertical angle radiation for working stations out to ranges of several thousand kilometersB. High vertical angle radiation for working stations within a radius of a few hundred kilometersC. High forward gainD. All of these choices are correct
120Antennas & Feedlines
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G9D02 - Which of the following is an advantage of an NVIS antenna?
A. Low vertical angle radiation for working stations out to ranges of several thousand kilometers
B. High vertical angle B. High vertical angle radiation for working stations radiation for working stations within a radius of a few within a radius of a few hundred kilometershundred kilometersC. High forward gainD. All of these choices are correct
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G9D03 - At what height above ground is an NVIS antenna typically
installed?
A. As close to 1/2 wavelength as possibleB. As close to one wavelength as possibleC. Height is not critical as long as it is significantly more than 1/2 wavelengthD. Between 1/10 and 1/4 wavelength
122Antennas & Feedlines
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G9D03 - At what height above ground is an NVIS antenna typically
installed?
A. As close to 1/2 wavelength as possibleB. As close to one wavelength as possibleC. Height is not critical as long as it is significantly more than 1/2 wavelength
D. Between 1/10 and 1/4 wavelengthD. Between 1/10 and 1/4 wavelength
123Antennas & Feedlines
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G9D04 - What is the primary purpose of antenna traps?
A. To permit multiband operationB. To notch spurious frequenciesC. To provide balanced feed point impedanceD. To prevent out of band operation
124Antennas & Feedlines
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G9D04 - What is the primary purpose of antenna traps?
A. To permit multiband A. To permit multiband operationoperationB. To notch spurious frequenciesC. To provide balanced feed point impedanceD. To prevent out of band operation
125Antennas & Feedlines
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Antenna Traps
126Antennas & Feedlines
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G9D05 - What is an advantage of vertical stacking of horizontally
polarized Yagi antennas?
A. It allows quick selection of vertical or horizontal polarizationB. It allows simultaneous vertical and horizontal polarizationC. It narrows the main lobe in azimuthD. It narrows the main lobe in elevation
127Antennas & Feedlines
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G9D05 - What is an advantage of vertical stacking of horizontally
polarized Yagi antennas?
A. It allows quick selection of vertical or horizontal polarizationB. It allows simultaneous vertical and horizontal polarizationC. It narrows the main lobe in azimuth
D. It narrows the main lobe in D. It narrows the main lobe in elevationelevation
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G9D06 - Which of the following is an advantage of a log periodic
antenna?
A. Wide bandwidthB. Higher gain per element than a Yagi antennaC. Harmonic suppressionD. Polarization diversity
129Antennas & Feedlines
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G9D06 - Which of the following is an advantage of a log periodic
antenna?
A. Wide bandwidthA. Wide bandwidthB. Higher gain per element than a Yagi antennaC. Harmonic suppressionD. Polarization diversity
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G9D07 - Which of the following describes a log periodic antenna?
A. Length and spacing of the elements increase logarithmically from one end of the boom to the otherB. Impedance varies periodically as a function of frequencyC. Gain varies logarithmically as a function of frequencyD. SWR varies periodically as a function of boom length
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G9D07 - Which of the following describes a log periodic antenna?
A. Length and spacing of the elements A. Length and spacing of the elements increase logarithmically from one end increase logarithmically from one end of the boom to the otherof the boom to the otherB. Impedance varies periodically as a function of frequencyC. Gain varies logarithmically as a function of frequencyD. SWR varies periodically as a function of boom length
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G9D08 - Why is a Beverage antenna not used for transmitting?
A. Its impedance is too low for effective matchingB. It has high losses compared to other types of antennasC. It has poor directivityD. All of these choices are correct
133Antennas & Feedlines
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Redneck Beverage Antenna
134Antennas & Feedlines
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G9D08 - Why is a Beverage antenna not used for transmitting?
A. Its impedance is too low for effective matching
B. It has high losses compared to B. It has high losses compared to other types of antennasother types of antennasC. It has poor directivityD. All of these choices are correct
135Antennas & Feedlines
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G9D09 - Which of the following is an application for a Beverage
antenna?
A. Directional transmitting for low HF bandsB. Directional receiving for low HF bandsC. Portable direction finding at higher HF frequenciesD. Portable direction finding at lower HF frequencies
136Antennas & Feedlines
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G9D09 - Which of the following is an application for a Beverage
antenna?
A. Directional transmitting for low HF bands
B. Directional receiving for low HF B. Directional receiving for low HF bandsbandsC. Portable direction finding at higher HF frequenciesD. Portable direction finding at lower HF frequencies
137Antennas & Feedlines
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G9D10 - Which of the following describes a Beverage antenna?
A. A vertical antennaB. A broad-band mobile antenna C. A helical antenna for space receptionD. A very long and low directional receiving antenna
138Antennas & Feedlines
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G9D10 - Which of the following describes a Beverage antenna?
A. A vertical antennaB. A broad-band mobile antenna C. A helical antenna for space reception
D. A very long and low D. A very long and low directional receiving antennadirectional receiving antenna
139Antennas & Feedlines
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G9D11 - Which of the following is a disadvantage of multiband
antennas?
A. They present low impedance on all design frequenciesB. They must be used with an antenna tunerC. They must be fed with open wire lineD. They have poor harmonic rejection
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G9D11 - Which of the following is a disadvantage of multiband
antennas?
A. They present low impedance on all design frequenciesB. They must be used with an antenna tunerC. They must be fed with open wire line
D. They have poor harmonic rejectionD. They have poor harmonic rejection
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End OfSUBELEMENT G9
ANTENNAS AND FEEDLINES