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RIC-7 — Basic Qualification Question Bank for Amateur Radio Operator Certificate Examinations

B-006-01-01 (3)
What connects your transceiver to your antenna?

  • The power cord
  • A ground wire
  • A feed line
  • A dummy load

B-006-01-02 (2)
The characteristic impedance of a transmission line is determined by the:

  • length of the line
  • physical dimensions and relative positions of the conductors
  • frequency at which the line is operated
  • load placed on the line

B-006-01-03 (1)
The characteristic impedance of a 20 metre piece of transmission line is 52 ohms. If 10 metres were cut off, the impedance would be:

  • 52 ohms
  • 26 ohms
  • 39 ohms
  • 13 ohms

B-006-01-04 (1)
The impedance of a coaxial line:

  • can be the same for different diameter line
  • changes with the frequency of the energy it carries
  • is correct for only one size of line
  • is greater for larger diameter line

B-006-01-05 (4)
What commonly available antenna feed line can be buried directly in the ground for some distance without adverse effects?

  • 300 ohm twin-lead
  • 600 ohm open-wire
  • 75 ohm twin-lead
  • coaxial cable

B-006-01-06 (4)
The characteristic impedance of a transmission line is:

  • the impedance of a section of the line one wavelength long
  • the dynamic impedance of the line at the operating frequency
  • the ratio of the power supplied to the line to the power delivered to the termination
  • equal to the pure resistance which, if connected to the end of the line, will absorb all the power arriving along it

B-006-01-07 (3)
A transmission line differs from an ordinary circuit or network in communications or signaling devices in one very important way. That important aspect is:

  • capacitive reactance
  • inductive reactance
  • propagation delay
  • resistance

B-006-01-08 (1)
The characteristic impedance of a parallel wire transmission line does not depend on the:

  • velocity of energy on the line
  • radius of the conductors
  • centre to centre distance between conductors
  • dielectric

B-006-01-09 (1)
Any length of transmission line may be made to appear as an infinitely long line by:

  • terminating the line in its characteristic impedance
  • leaving the line open at the end
  • shorting the line at the end
  • increasing the standing wave ratio above unity

B-006-01-10 (1)
What factors determine the characteristic impedance of a parallel-conductor antenna feed line?

  • The distance between the centres of the conductors and the radius of the conductors
  • The distance between the centres of the conductors and the length of the line
  • The radius of the conductors and the frequency of the signal
  • The frequency of the signal and the length of the line
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B-006-01-11 (1)
What factors determine the characteristic impedance of a coaxial antenna feed line?

  • The ratio of the diameter of the inner conductor to the diameter of the braid
  • The diameter of the braid and the length of the line
  • The diameter of the braid and the frequency of the signal
  • The frequency of the signal and the length of the line

B-006-02-01 (4)
What is a coaxial cable?

  • Two wires side-by-side in a plastic ribbon
  • Two wires side-by-side held apart by insulating rods
  • Two wires twisted around each other in a spiral
  • A center wire inside an insulating material which is covered by a metal sleeve or shield

B-006-02-02 (4)
What is parallel-conductor feed line?

  • Two wires twisted around each other in a spiral
  • A center wire inside an insulating material which is covered by a metal sleeve or shield
  • A metal pipe which is as wide or slightly wider than a wavelength of the signal it carries
  • Two wires side-by-side held apart by insulating rods

B-006-02-03 (1)
What kind of antenna feed line is made of two conductors held apart by insulated rods?

  • Open-conductor ladder line
  • Coaxial cable
  • Twin lead in a plastic ribbon
  • Twisted pair

B-006-02-04 (2)
What does the term "balun" mean?

  • Balanced unloader
  • Balanced to unbalanced
  • Balanced unmodulator
  • Balanced antenna network

B-006-02-05 (1)
Where would you install a balun to feed a dipole antenna with 50-ohm coaxial cable?

  • Between the coaxial cable and the antenna
  • Between the transmitter and the coaxial cable
  • Between the antenna and the ground
  • Between the coaxial cable and the ground

B-006-02-06 (4)
What is an unbalanced line?

  • Feed line with neither conductor connected to ground
  • Feed line with both conductors connected to ground
  • Feed line with both conductors connected to each other
  • Feed line with one conductor connected to ground

B-006-02-07 (2)
What device can be installed to feed a balanced antenna with an unbalanced feed line?

  • A triaxial transformer
  • A balun
  • A wavetrap
  • A loading coil

B-006-02-08 (3)
A flexible coaxial line contains:

  • four or more conductors running parallel
  • only one conductor
  • braid and insulation around a central conductor
  • two parallel conductors separated by spacers

B-006-02-09 (1)
A balanced transmission line:

  • is made of two parallel wires
  • has one conductor inside the other
  • carries RF current on one wire only
  • is made of one conductor only
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B-006-02-10 (2)
A 75 ohm transmission line could be matched to the 300 ohm feedpoint of an antenna:

  • with an extra 250 ohm resistor
  • by using a 4 to 1 balun
  • by using a 4 to 1 trigatron
  • by inserting a diode in one leg of the antenna

B-006-02-11 (3)
What kind of antenna feed line can be constructed using two conductors which are maintained a uniform distance apart using insulated spreaders?

  • Coaxial cable
  • 75 ohm twin-lead
  • 600 ohm open-wire
  • 300 ohm twin-lead

B-006-03-01 (2)
Why does coaxial cable make a good antenna feed line?

  • It is weatherproof, and its impedance is higher than that of most amateur antennas
  • It is weatherproof, and its impedance matches most amateur antennas
  • It can be used near metal objects, and its impedance is higher than that of most amateur antennas
  • You can make it at home, and its impedance matches most amateur antennas

B-006-03-02 (3)
What is the best antenna feed line to use, if it must be put near grounded metal objects?

  • Ladder-line
  • Twisted pair
  • Coaxial cable
  • Twin lead

B-006-03-03 (3)
What are some reasons not to use parallel-conductor feed line?

  • You must use an impedance-matching device with your transceiver, and it does not work very well with a high SWR
  • It does not work well when tied down to metal objects, and it cannot operate under high power
  • It does not work well when tied down to metal objects, and you must use an impedance- matching device with your transceiver
  • It is difficult to make at home, and it does not work very well with a high SWR

B-006-03-04 (1)
What common connector usually joins RG-213 coaxial cable to an HF transceiver?

  • A PL-259 connector
  • An F-type cable connector
  • A banana plug connector
  • A binding post connector

B-006-03-05 (1)
What common connector usually joins a hand-held transceiver to its antenna?

  • A BNC connector
  • A PL-259 connector
  • An F-type cable connector
  • A binding post connector

B-006-03-06 (4)
Which of these common connectors has the lowest loss at UHF?

  • An F-type cable connector
  • A BNC connector
  • A PL-259 connector
  • A type-N connector

B-006-03-07 (3)
If you install a 6 metre Yagi antenna on a tower 50 metres from your transmitter, which of the following feed lines is best?

  • RG-174
  • RG-59
  • RG-213
  • RG-58

B-006-03-08 (1)
Why should you regularly clean, tighten and re-solder all antenna connectors?

  • To help keep their resistance at a minimum
  • To keep them looking nice
  • To keep them from getting stuck in place
  • To increase their capacitance
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B-006-03-09 (3)
What commonly available antenna feed line can be buried directly in the ground for some distance without adverse effects?

  • 75 ohm twin-lead
  • 600 ohm open-wire
  • Coaxial cable
  • 300 ohm twin-lead

B-006-03-10 (4)
When antenna feed lines must be placed near grounded metal objects, which of the following feed lines should be used?

  • 300 ohm twin-lead
  • 600 ohm open-wire
  • 75 ohm twin-lead
  • Coaxial cable

B-006-03-11 (3)
TV twin-lead feed line can be used for a feed line in an amateur station. The impedance of this line is approximately:

  • 600 ohms
  • 50 ohms
  • 300 ohms
  • 70 ohms

B-006-04-01 (4)
Why should you use only good quality coaxial cable and connectors for a UHF antenna system?

  • To keep television interference high
  • To keep the power going to your antenna system from getting too high
  • To keep the standing wave ratio of your antenna system high
  • To keep RF loss low

B-006-04-02 (1)
What are some reasons to use parallelconductor feed line?

  • It will operate with a high SWR, and has less loss than coaxial cable
  • It has low impedance, and will operate with a high SWR
  • It will operate with a high SWR, and it works well when tied down to metal objects
  • It has a low impedance, and has less loss than coaxial cable

B-006-04-03 (2)
If your transmitter and antenna are 15 metres apart, but are connected by 65 metres of RG-58 coaxial cable, what should be done to reduce feed line loss?

  • Shorten the excess cable so the feed line is an odd number of wavelengths long
  • Shorten the excess cable
  • Roll the excess cable into a coil which is as small as possible
  • Shorten the excess cable so the feed line is an even number of wavelengths long

B-006-04-04 (2)
As the length of a feed line is changed, what happens to signal loss?

  • Signal loss decreases as length increases
  • Signal loss increases as length increases
  • Signal loss is the least when the length is the same as the signal's wavelength
  • Signal loss is the same for any length of feed line

B-006-04-05 (2)
As the frequency of a signal is changed, what happens to signal loss in a feed line?

  • Signal loss increases with decreasing frequency
  • Signal loss increases with increasing frequency
  • Signal loss is the least when the signal's wavelength is the same as the feed line's length
  • Signal loss is the same for any frequency

B-006-04-06 (2)
Losses occurring on a transmission line between transmitter and antenna results in:

  • an SWR reading of 1:1
  • less RF power being radiated
  • reflections occurring in the line
  • the wire radiating RF energy

B-006-04-07 (1)
The lowest loss feed line on HF is:

  • open-wire
  • 75 ohm twin-lead
  • coaxial cable
  • 300 ohm twin-lead
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B-006-04-08 (4)
In what values are RF feed line losses expressed?

  • ohms per MHz
  •  dB per MHz
  • ohms per metre
  •  dB per unit length

B-006-04-09 (1)
If the length of coaxial feed line is increased from 20 metres (65.6 ft) to 40 metres (131.2 ft), how would this affect the line loss?

  • It would be increased by 100%
  • It would be reduced by 10%
  • It would be increased by 10%
  • It would be reduced to 50%

B-006-04-10 (4)
If the frequency is increased, how would this affect the loss on a transmission line?

  • It is independent of frequency
  • It would increase
  • It depends on the line length
  • It would decrease

B-006-05-01 (1)
What does an SWR reading of 1:1 mean?

  • The best impedance match has been attained
  • An antenna for another frequency band is probably connected
  • No power is going to the antenna
  • The SWR meter is broken

B-006-05-02 (1)
What does an SWR reading of less than 1.5:1 mean?

  • A fairly good impedance match
  • An impedance match which is too low
  • An impedance mismatch; something may be wrong with the antenna system
  • An antenna gain of 1.5

B-006-05-03 (3)
What kind of SWR reading may mean poor electrical contact between parts of an antenna system?

  • A negative reading
  • No reading at all
  • A jumpy reading
  • A very low reading

B-006-05-04 (2)
What does a very high SWR reading mean?

  • The transmitter is putting out more power than normal, showing that it is about to go bad
  • The antenna is the wrong length, or there may be an open or shorted connection somewhere in the feed line
  • There is a large amount of solar radiation, which means very poor radio conditions
  • The signals coming from the antenna are unusually strong, which means very good radio conditions

B-006-05-05 (1)
What does standing-wave ratio mean?

  • The ratio of maximum to minimum voltages on a feed line
  • The ratio of maximum to minimum inductances on a feed line
  • The ratio of maximum to minimum resistances on a feed line
  • The ratio of maximum to minimum impedances on a feed line

B-006-05-06 (4)
If your antenna feed line gets hot when you are transmitting, what might this mean?

  • You should transmit using less power
  • The conductors in the feed line are not insulated very well
  • The feed line is too long
  • The SWR may be too high, or the feed line loss may be high

B-006-05-07 (4)
If the characteristic impedance of the feedline does not match the antenna input impedance then:

  • heat is produced at the junction
  • the SWR reading falls to 1:1
  • the antenna will not radiate any signal
  • standing waves are produced in the feedline
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B-006-05-08 (4)
The result of the presence of standing waves on a transmission line is:

  • perfect impedance match between transmitter and feedline
  • maximum transfer of energy to the antenna from the transmitter
  • lack of radiation from the transmission line
  • reduced transfer of RF energy to the antenna

B-006-05-09 (1)
An SWR meter measures the degree of match between transmission line and antenna by:

  • comparing forward and reflected voltage
  • measuring radiated RF energy
  • measuring the conductor temperature
  • inserting a diode in the feed line

B-006-05-10 (3)
A resonant antenna having a feed point impedance of 200 ohms is connected to a feed line and transmitter which have an impedance of 50 ohms. What will the standing wave ratio of this system be?

  • 6:1
  • 3:1
  • 4:1
  • 5:1

B-006-05-11 (2)
The type of feed line best suited to operating at a high standing wave ratio is:

  • 75 ohm twin-lead
  • 600 ohm open-wire
  • coaxial line
  • 300 ohm twin-lead

B-006-06-01 (1)
What device might allow use of an antenna on a band it was not designed for?

  • An antenna tuner
  • An SWR meter
  • A low pass filter
  • A high pass filter

B-006-06-02 (1)
What does an antenna matching unit do?

  • It matches a transceiver to a mismatched antenna system
  • It helps a receiver automatically tune in stations that are far away
  • It switches an antenna system to a transmitter when sending, and to a receiver when listening
  • It switches a transceiver between different kinds of antennas connected to one feed line

B-006-06-03 (2)
What would you use to connect a coaxial cable of 50 ohms impedance to an antenna of 35 ohms impedance?

  • An SWR meter
  • An impedance-matching device
  • A low pass filter
  • A terminating resistor

B-006-06-04 (3)
When will a power source deliver maximum output to the load?

  • When air wound transformers are used instead of iron-core transformers
  • When the power-supply fuse rating equals the primary winding current
  • When the impedance of the load is equal to the impedance of the source
  • When the load resistance is infinite

B-006-06-05 (2)
What happens when the impedance of an electrical load is equal to the internal impedance of the power source?

  • The electrical load is shorted
  • The source delivers maximum power to the load
  • No current can flow through the circuit
  • The source delivers minimum power to the load

B-006-06-06 (4)
Why is impedance matching important?

  • So the load will draw minimum power from the source
  • To ensure that there is less resistance than reactance in the circuit
  • To ensure that the resistance and reactance in the circuit are equal
  • So the source can deliver maximum power to the load
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B-006-06-07 (3)
To obtain efficient power transmission from a transmitter to an antenna requires:

  • high load impedance
  • low ohmic resistance
  • matching of impedances
  • inductive impedance

B-006-06-08 (2)
To obtain efficient transfer of power from a transmitter to an antenna, it is important that there is a:

  • high load impedance
  • matching of impedance
  • proper method of balance
  • low ohmic resistance

B-006-06-09 (4)
If an antenna is correctly matched to a transmitter, the length of transmission line:

  • must be a full wavelength long
  • must be an odd number of quarter-wave
  • must be an even number of half-waves
  • will have no effect on the matching

B-006-06-10 (2)
The reason that an RF transmission line should be matched at the transmitter end is to:

  • ensure that the radiated signal has the intended polarization
  • transfer the maximum amount of power to the antenna
  • prevent frequency drift
  • overcome fading of the transmitted signal

B-006-06-11 (4)
If the centre impedance of a folded dipole is approximately 300 ohms, and you are using RG8U (50 ohms) coaxial lines, what is the ratio required to have the line and the antenna matched?

  • 2:1
  • 4:1
  • 10:1
  • 6:1

B-006-07-01 (3)
What does horizontal wave polarization mean?

  • The electric and magnetic lines of force of a radio wave are perpendicular to the earth's surface
  • The electric lines of force of a radio wave are perpendicular to the earth's surface
  • The electric lines of force of a radio wave are parallel to the earth's surface
  • The magnetic lines of force of a radio wave are parallel to the earth's surface

B-006-07-02 (2)
What does vertical wave polarization mean?

  • The magnetic lines of force of a radio wave are perpendicular to the earth's surface
  • The electric lines of force of a radio wave are perpendicular to the earth's surface
  • The electric and magnetic lines of force of a radio wave are parallel to the earth's surface
  • The electric lines of force of a radio wave are parallel to the earth's surface

B-006-07-03 (2)
What electromagnetic wave polarization does a Yagi antenna have when its elements are parallel to the earth's surface?

  • Helical
  • Horizontal
  • Vertical
  • Circular

B-006-07-04 (4)
What electromagnetic wave polarization does a half-wavelength antenna have when it is perpendicular to the earth's surface?

  • Circular
  • Horizontal
  • Parabolical
  • Vertical

B-006-07-05 (2)
Polarization of an antenna is determined by:

  • the height of the antenna
  • the electric field
  • the type of antenna
  • the magnetic field
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B-006-07-06 (1)
An isotropic antenna is a:

  • hypothetical point source
  • infinitely long piece of wire
  • dummy load
  • half-wave reference dipole

B-006-07-07 (4)
What is the antenna radiation pattern for an isotropic radiator?

  • A parabola
  • A cardioid
  • A unidirectional cardioid
  • A sphere

B-006-07-08 (3)
VHF signals from a mobile station using a vertical whip antenna will normally be best received using a:

  • random length of wire
  • horizontal ground-plane antenna
  • vertical ground-plane antenna
  • horizontal dipole antenna

B-006-07-09 (4)
A dipole antenna will emit a vertically polarized wave if it is:

  • fed with the correct type of RF
  • too near to the ground
  • parallel with the ground
  • mounted vertically

B-006-07-10 (2)
If an electromagnetic wave leaves an antenna vertically polarized, it will arrive at the receiving antenna, by ground wave:

  • polarized at right angles to original
  • vertically polarized
  • horizontally polarized
  • polarized in any plane

B-006-07-11 (4)
Compared with a horizontal antenna, a vertical antenna will receive a vertically polarized radio wave:

  • at weaker strength
  • without any comparative difference
  • if the antenna changes the polarization
  • at greater strength

B-006-08-01 (1)
If an antenna is made longer, what happens to its resonant frequency?

  • It decreases
  • It increases
  • It stays the same
  • It disappears

B-006-08-02 (2)
If an antenna is made shorter, what happens to its resonant frequency?

  • It stays the same
  • It increases
  • It disappears
  • It decreases

B-006-08-03 (3)
The wavelength for a frequency of 25 MHz is:

  • 15 metres (49.2 ft)
  • 4 metres (13.1 ft)
  • 12 metres (39.4 ft)
  • 32 metres (105 ft)

B-006-08-04 (1)
The velocity of propagation of radio frequency energy in free space is:

  • 300 000 kilometres per second
  • 3000 kilometres per second
  • 150 kilometres per second
  • 186 000 kilometres per second
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B-006-08-05 (3)
Adding a series inductance to an antenna would:

  • increase the resonant frequency
  • have little effect
  • decrease the resonant frequency
  • have no change on the resonant frequency

B-006-08-06 (3)
The resonant frequency of an antenna may be increased by:

  • lowering the radiating element
  • increasing the height of the radiating element
  • shortening the radiating element
  • lengthening the radiating element

B-006-08-07 (2)
The speed of a radio wave:

  • is infinite in space
  • is the same as the speed of light
  • is always less than half speed of light
  • varies directly with frequency

B-006-08-08 (1)
At the end of suspended antenna wire, insulators are used. These act to:

  • limit the electrical length of the antenna
  • increase the effective antenna length
  • allow the antenna to be more easily held vertically
  • prevent any loss of radio waves by the antenna

B-006-08-09 (2)
To lower the resonant frequency of an antenna, the operator should:

  • shorten it
  • lengthen it
  • ground one end
  • centre feed it with TV ribbon feeder

B-006-08-10 (2)
One solution to multiband operation with a shortened radiator is the "trap dipole" or trap vertical. These "traps" are actually:

  • large wire-wound resistors
  • a coil and capacitor in parallel
  • coils wrapped around a ferrite rod
  • hollow metal cans

B-006-08-11 (2)
The wavelength corresponding to a frequency of 2 MHz is:

  • 360 m (1181 ft)
  • 150 m (492 ft)
  • 1500 m (4921 ft)
  • 30 m (98 ft)

B-006-09-01 (3)
What is a parasitic beam antenna?

  • An antenna where the driven element obtains its radio energy by induction or radiation from director elements
  • An antenna where all elements are driven by direct connection to the feed line
  • An antenna where some elements obtain their radio energy by induction or radiation from a driven element
  • An antenna where wave traps are used to magnetically couple the elements

B-006-09-02 (2)
How can the bandwidth of a parasitic beam antenna be increased?

  • Use traps on the elements
  • Use larger diameter elements
  • Use tapered-diameter elements
  • Use closer element spacing

B-006-09-03 (2)
If a slightly shorter parasitic element is placed 0.1 wavelength away from an HF dipole antenna, what effect will this have on the antenna's radiation pattern?

  • A major lobe will develop in the horizontal plane, parallel to the two elements
  • A major lobe will develop in the horizontal plane, toward the parasitic element
  • A major lobe will develop in the vertical plane, away from the ground
  • The radiation pattern will not be affected
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B-006-09-04 (3)
If a slightly longer parasitic element is placed 0.1 wavelength away from an HF dipole antenna, what effect will this have on the antenna's radiation pattern?

  • A major lobe will develop in the horizontal plane, parallel to the two elements
  • A major lobe will develop in the vertical plane, away from the ground
  • A major lobe will develop in the horizontal plane, away from the parasitic element, toward the dipole
  • The radiation pattern will not be affected

B-006-09-05 (1)
The property of an antenna, which defines the range of frequencies to which it will respond, is called its:

  • bandwidth
  • front-to-back ratio
  • impedance
  • polarization

B-006-09-06 (4)
Approximately how much gain does a half-wave dipole have over an isotropic radiator?

  • 1.5 dB
  • 3.0 dB
  • 6.0 dB
  • 2.1 dB

B-006-09-07 (4)
What is meant by antenna gain?

  • The numerical ratio of the signal in the forward direction to the signal in the back direction
  • The numerical ratio of the amount of power radiated by an antenna compared to the transmitter output power
  • The final amplifier gain minus the transmission line losses
  • The numerical ratio relating the radiated signal strength of an antenna to that of another antenna

B-006-09-08 (4)
What is meant by antenna bandwidth?

  • Antenna length divided by the number of elements
  • The angle between the half- power radiation points
  • The angle formed between two imaginary lines drawn through the ends of the elements
  • The frequency range over which the antenna may be expected to perform well

B-006-09-09 (1)
In free space, what is the radiation characteristic of a half-wave dipole?

  • Minimum radiation from the ends, maximum broadside
  • Maximum radiation from the ends, minimum broadside
  • Omnidirectional
  • Maximum radiation at 45 degrees to the plane of the antenna

B-006-09-10 (1)
The gain of an antenna, especially on VHF and above, is quoted in dBi. The "i" in this expression stands for:

  • isotropic
  • ideal
  • ionosphere
  • interpolated

B-006-09-11 (2)
The front-to-back ratio of a beam antenna is:

  • the forward power of the major lobe to the power in the backward direction both being measured at the 3 dB points
  • the ratio of the maximum forward power in the major lobe to the maximum backward power radiation
  • undefined
  • the ratio of the forward power at the 3 dB points to the power radiated in the backward direction

B-006-10-01 (3)
How do you calculate the length in metres (feet) of a quarter-wavelength vertical antenna?

  • Divide 468 (1532) by the antenna's operating frequency (in MHz)
  • Divide 300 (982) by the antenna's operating frequency (in MHz)
  • Divide 71.5 (234) by the antenna's operating frequency (in MHz)
  • Divide 150 (491) by the antenna's operating frequency (in MHz)

B-006-10-02 (2)
If you made a quarter-wavelength vertical antenna for 21.125 MHz, how long would it be?

  • 3.6 metres (11.8 ft)
  • 3.36 metres (11.0 ft)
  • 7.2 metres (23.6 ft)
  • 6.76 metres (22.2 ft)
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B-006-10-03 (1)
If you made a half-wavelength vertical antenna for 223 MHz, how long would it be?

  • 64 cm (25.2 in)
  • 128 cm (50.4 in)
  • 105 cm (41.3 in)
  • 134.6 cm (53 in)

B-006-10-04 (2)
Why is a 5/8-wavelength vertical antenna better than a 1/4-wavelength vertical antenna for VHF or UHF mobile operations?

  • A 5/8-wavelength antenna has less corona loss
  • A 5/8-wavelength antenna has more gain
  • A 5/8-wavelength antenna is easier to install on a car
  • A 5/8-wavelength antenna can handle more power

B-006-10-05 (3)
If a magnetic-base whip antenna is placed on the roof of a car, in what direction does it send out radio energy?

  • Most of it is aimed high into the sky
  • Most of it goes equally in two opposite directions
  • It goes out equally well in all horizontal directions
  • Most of it goes in one direction

B-006-10-06 (3)
What is an advantage of downward sloping radials on a ground plane antenna?

  • It increases the radiation angle
  • It brings the feed point impedance closer to 300 ohms
  • It brings the feed point impedance closer to 50 ohms
  • It lowers the radiation angle

B-006-10-07 (1)
What happens to the feed point impedance of a ground-plane antenna when its radials are changed from horizontal to downward-sloping?

  • It increases
  • It decreases
  • It stays the same
  • It approaches zero

B-006-10-08 (4)
Which of the following transmission lines will give the best match to the base of a quarter-wave ground-plane antenna?

  • 300 ohms balanced feed line
  • 75 ohms balanced feed line
  • 300 ohms coaxial cable
  • 50 ohms coaxial cable

B-006-10-09 (1)
The main characteristic of a vertical antenna is that it will:

  • receive signals equally well from all compass points around it
  • be very sensitive to signals coming from horizontal antennas
  • require few insulators
  • be easy to feed with TV ribbon feeder

B-006-10-10 (1)
Why is a loading coil often used with an HF mobile vertical antenna?

  • To tune out capacitive reactance
  • To lower the losses
  • To lower the Q
  • To improve reception

B-006-10-11 (2)
What is the main reason why so many VHF base and mobile antennas are 5/8 of a wavelength?

  • The angle of radiation is high giving excellent local coverage
  • The angle of radiation is low
  • It is easy to match the antenna to the transmitter
  • It's a convenient length on VHF

B-006-11-01 (4)
How many directly driven elements do most Yagi antennas have?

  • None
  • Two
  • Three
  • One
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B-006-11-02 (4)
Approximately how long is the driven element of a Yagi antenna for 14.0 MHz?

  • 5.21 metres (17 feet)
  • 10.67 metres (35 feet)
  • 20.12 metres (66 feet)
  • 10.21 metres (33 feet and 6 inches)

B-006-11-03 (2)
Approximately how long is the director element of a Yagi antenna for 21.1 MHz?

  • 5.18 metres (17 feet)
  • 6.4 metres (21 feet)
  • 3.2 metres (10.5 feet)
  • 12.8 metres (42 feet)

B-006-11-04 (2)
Approximately how long is the reflector element of a Yagi antenna for 28.1 MHz?

  • 4.88 metres (16 feet)
  • 5.33 metres (17.5 feet)
  • 10.67 metres (35 feet)
  • 2.66 metres (8.75 feet)

B-006-11-05 (4)
What is one effect of increasing the boom length and adding directors to a Yagi antenna?

  • SWR increases
  • Weight decreases
  • Wind load decreases
  • Gain increases

B-006-11-06 (1)
What are some advantages of a Yagi with wide element spacing?

  • High gain, less critical tuning and wider bandwidth
  • High gain, lower loss and a low SWR
  • High front-to-back ratio and lower input resistance
  • Shorter boom length, lower weight and wind resistance

B-006-11-07 (4)
Why is a Yagi antenna often used for radiocommunications on the 20-metre band?

  • It provides excellent omnidirectional coverage in the horizontal plane
  • It is smaller, less expensive and easier to erect than a dipole or vertical antenna
  • It provides the highest possible angle of radiation for the HF bands
  • It helps reduce interference from other stations off to the side or behind

B-006-11-08 (2)
What does "antenna front-to- back ratio" mean in reference to a Yagi antenna?

  • 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 in exactly the opposite direction
  • 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-006-11-09 (1)
What is a good way to get maximum performance from a Yagi antenna?

  • Optimize the lengths and spacing of the elements
  • Use RG-58 feed line
  • Use a reactance bridge to measure the antenna performance from each direction around the antenna
  • Avoid using towers higher than 9 metres (30 feet) above the ground

B-006-11-10 (4)
The spacing between the elements on a three-element Yagi antenna, representing the best overall choice, is _______ of a wavelength.

  • 0.15
  • 0.5
  • 0.75
  • 0.2

B-006-11-11 (2)
If the forward gain of a six- element Yagi is about 10 dB, what would the gain of two of these antennas be if they were "stacked"?

  • 7 dB
  • 13 dB
  • 20 dB
  • 10 dB
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B-006-12-01 (4)
If you made a half-wavelength dipole antenna for 28.550 MHz, how long would it be?

  • 10.5 metres (34.37 ft)
  • 28.55 metres (93.45 ft)
  • 5.08 metres (16.62 ft)
  • 10.16 metres (33.26 ft)

B-006-12-02 (3)
What is one disadvantage of a random wire antenna?

  • It usually produces vertically polarized radiation
  • It must be longer than 1 wavelength
  • You may experience RF feedback in your station
  • You must use an inverted T matching network for multi-band operation

B-006-12-03 (1)
What is the low angle radiation pattern of an ideal half-wavelength dipole HF antenna installed parallel to the earth?

  • It is a figure-eight, perpendicular to the antenna
  • It is a circle (equal radiation in all directions)
  • It is two smaller lobes on one side of the antenna, and one larger lobe on the other side
  • It is a figure-eight, off both ends of the antenna

B-006-12-04 (2)
The impedances in ohms at the feed point of the dipole and folded dipole are, respectively:

  • 73 and 150
  • 73 and 300
  • 52 and 100
  • 52 and 200

B-006-12-05 (4)
A dipole transmitting antenna, placed so that the ends are pointing North/South, radiates:

  • mostly to the South and North
  • mostly to the South
  • equally in all directions
  • mostly to the East and West

B-006-12-06 (4)
How does the bandwidth of a folded dipole antenna compare with that of a simple dipole antenna?

  • It is essentially the same
  • It is less than 50%
  • It is 0.707 times the bandwidth
  • It is greater

B-006-12-07 (2)
What is a disadvantage of using an antenna equipped with traps?

  • It is too sharply directional at lower frequencies
  • It will radiate harmonics
  • It must be neutralized
  • It can only be used for one band

B-006-12-08 (1)
What is an advantage of using a trap antenna?

  • It may be used for multi- band operation
  • It has high directivity at the higher frequencies
  • It has high gain
  • It minimizes harmonic radiation

B-006-12-09 (1)
The "doublet antenna" is the most common in the amateur service. If you were to cut this antenna for 3.75 MHz, what would be its approximate length?

  • 38 meters (125 ft.)
  • 32 meters (105 ft.)
  • 45 meters (145 ft.)
  • 75 meters (245 ft.)

B-006-13-01 (3)
What is a cubical quad antenna?

  • A center-fed wire 1/2-electrical wavelength long
  • A vertical conductor 1/4- electrical wavelength high, fed at the bottom
  • Two or more parallel four- sided wire loops, each approximately one-electrical wavelength long
  • Four straight, parallel elements in line with each other, each approximately 1/2- electrical wavelength long
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B-006-13-02 (1)
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 (1)
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 (2)
Approximately how long is each side of a cubical quad antenna driven element for 14.3 MHz?

  • 21.43 metres (70.3 feet)
  • 5.36 metres (17.6 feet)
  • 53.34 metres (175 feet)
  • 7.13 metres (23.4 feet)

B-006-13-05 (4)
Approximately how long is each leg of a symmetrical delta loop antenna driven element for 28.7 MHz?

  • 2.67 metres (8.75 feet)
  • 7.13 metres (23.4 feet)
  • 10.67 metres (35 feet)
  • 3.5 metres (11.5 feet)

B-006-13-06 (2)
Which statement about two- element delta loops and quad antennas is true?

  • They perform very well only at HF
  • They compare favorably with a threeelement Yagi
  • They are effective only when constructed using insulated wire
  • They perform poorly above HF

B-006-13-07 (1)
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 (3)
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?

  • It will change the antenna polarization from vertical to horizontal
  • It will significantly decrease the antenna feed point impedance
  • It will change the antenna polarization from horizontal to vertical
  • It will significantly increase the antenna feed point impedance

B-006-13-09 (2)
What does the term "antenna front-toback ratio" mean in reference to a delta loop antenna?

  • 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 in exactly the opposite direction
  • 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 (2)
The cubical "quad" or "quad" antenna consists of two or more square loops of wire. The driven element has an approximate overall length of:

  • three-quarters of a wavelength
  • one wavelength
  • two wavelengths
  • one-half wavelength

B-006-13-11 (2)
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-quarter of a wavelength
  • one wavelength
  • two wavelengths
  • one-half of a wavelength
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