Advanced Amateur A-007 Practice Exam 
Practice Exam for Section 007 of the ISED Advanced Amateur Radio Examination.
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What term describes a method used to match a high-impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places, spaced a fraction of a wavelength on each side of the driven element centre? *
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What kind of impedance does a half wavelength transmission line present to the source when the line is open at the far end? *
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Waveguide is typically used: *
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In a half-wave dipole, the distribution of _______ is highest at each end. *
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A transmitter has an output of 1000 watts PEP. The coaxial cable, connectors and antenna tuner have a composite loss of 1 dB, and the antenna gain is 10 dBd. What is the Effective Radiated Power (ERP) in watts PEP? *
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Which type of network provides the greatest harmonic suppression? *
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What term describes a method of antenna impedance matching that uses a short section of transmission line connected to the antenna transmission line near the antenna and perpendicular to the transmission line? *
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For rectangular waveguide to transfer energy, the cross-section should be at least: *
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A Yagi antenna uses a gamma match. The adjustable gamma rod connects to: *
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Which of the following is NOT a valid parabolic dish illumination arrangement? *
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The matching of a driven element with a single adjustable mechanical and capacitive arrangement is descriptive of: *
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In a half-wave dipole, where does minimum voltage occur? *
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A Smith Chart is useful: *
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A Yagi antenna uses a gamma match. The variable capacitor connects to the: *
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Why is a ground-mounted vertical quarter-wave antenna in reasonably open surroundings better for long distance contacts than a half-wave dipole at a quarter wavelength above ground? *
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At the ends of a half-wave dipole: *
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A transmitter has an output power of 200 watts. The coaxial and connector losses are 3 dB in total, and the antenna gain is 9 dBd. What is the approximate Effective Radiated Power of this system? *
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What precautions should you take before beginning repairs on a microwave feed horn or waveguide? *
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The reciprocal of the square root of the dielectric constant of the material used to separate the conductors in a transmission line gives the ____________ of the line: *
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A Yagi antenna uses a gamma match. The centre of the driven element connects to: *
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Assuming a velocity factor of 0.66 what would be the physical length of a typical coaxial stub that is electrically one quarter wavelength long at 14.1 MHz? *
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What factors determine the radiation resistance of an antenna? *
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A section of waveguide: *
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What kind of impedance does a quarter wavelength transmission line present to the source if the line is open at the far end? *
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Most simple horizontally polarized antennas do not exhibit significant directivity unless they are: *
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For an antenna tuner of the "Pi" type, which of the following statements is false? *
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How does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal dipole HF antenna? *
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What is printed circuit transmission line called? *
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Effective Radiated Power means the: *
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Greater distance can be covered with multiple-hop transmissions by decreasing the: *
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In a half-wave dipole, where does the minimum current occur? *
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What is the term used for an equivalent resistance which would dissipate the same amount of energy as that radiated from an antenna? *
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Which type of network offers the greatest transformation ratio? *
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When a half-wave dipole antenna is installed one-half wavelength above ground, the: *
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What is meant by circularly polarized electromagnetic waves? *
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What kind of impedance does a quarter wavelength transmission line present to the source when the line is shorted at the far end? *
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One antenna which will respond simultaneously to vertically- and horizontally-polarized signals is the: *
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The plane from which ground reflections can be considered to take place, or the effective ground plane for an antenna is: *
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In amateur work, what is the surface error upper limit you should try not to exceed on a parabolic reflector? *
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What is included in the total resistance of an antenna system? *
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Stripline is a: *
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What determines the velocity factor in a transmission line? *
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What is the term for the ratio of the actual velocity at which a signal travels through a transmission line to the speed of light in a vacuum? *
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In a half-wave dipole, the distribution of _______ is lowest at each end. *
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What is the Effective Radiated Power of an amateur transmitter, if the transmitter output power is 200 watts, the transmission line loss is 5 watts, and the antenna power gain is 3 dBd? *
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For long distance propagation, the vertical radiation angle of the energy from the antenna should be: *
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Which antenna system and operating frequency are most suitable for Near Vertical Incidence (NVIS) communications? *
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A transmitter has a power output of 100 watts. There is a loss of 1.30 dB in the transmission line, a loss of 0.2 dB through the antenna tuner, and a gain of 4.50 dBd in the antenna. The Effective Radiated Power (ERP) is: *
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Which of the following is not correct? Waveguide is an efficient transmission medium because it features: *
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How does a network transform one impedance to another? *
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You want to convert a surplus parabolic dish for amateur radio use, the gain of this antenna depends on: *
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As standing wave ratio rises, so does the loss in the transmission line. This is caused by: *
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Why would one need to know the radiation resistance of an antenna? *
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A transmitter has a power output of 125 watts. There is a loss of 0.8 dB in the transmission line, 0.2 dB in the antenna tuner, and a gain of 10 dBd in the antenna. The Effective Radiated Power (ERP) is: *
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A transmitter has an output of 100 watts. The cable and connectors have a composite loss of 3 dB, and the antenna has a gain of 6 dBd. What is the Effective Radiated Power? *
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What is a typical velocity factor for coaxial cable with polyethylene dielectric? *
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What is a pi-network? *
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A parabolic antenna is very efficient because: *
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What is the velocity factor of a transmission line? *
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If the ohmic resistance of a miniloop antenna is 2 milliohms and the radiation resistance is 50 milliohms, what is the antenna efficiency? *
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A transmitter has an output of 2000 watts PEP. The transmission line, connectors and antenna tuner have a composite loss of 1 dB, and the gain from the stacked Yagi antenna is 10 dBd. What is the Effective Radiated Power (ERP) in watts PEP? *
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A half-wave dipole antenna is normally fed at the point where: *
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If the ohmic resistance of a half-wave dipole is 2 ohms, and the radiation resistance is 72 ohms, what is the antenna efficiency? *
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Which of these antennas does not produce circular polarization? *
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What is meant by the radiation resistance of an antenna? *
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What kind of impedance does a half wavelength transmission line present to the source when the line is shorted at the far end? *
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How is antenna percent efficiency calculated? *
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The velocity factor of a transmission line is the: *
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A helical-beam antenna with right-hand polarization will best receive signals with: *
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If a 3 dBd gain antenna is replaced with a 9 dBd gain antenna, with no other changes, the Effective Radiated Power (ERP) will increase by: *
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Antenna beamwidth is the angular distance between: *
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What is the term for the ratio of the radiation resistance of an antenna to the total resistance of the system? *
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What advantage does a pi-L network have over a pi-network for impedance matching between a vacuum tube linear amplifier and a multiband antenna? *
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For an antenna tuner of the "Transformer" type, which of the following statements is FALSE? *
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A Yagi antenna uses a gamma match. The coaxial braid connects to: *
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Which of the following is a major advantage of waveguide over coaxial cable for use at microwave frequencies? *
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The driven element of a Yagi antenna is connected to a coaxial transmission line. The coax braid is connected to the centre of the driven element and the centre conductor is connected to a variable capacitor in series with an adjustable mechanical arrangement on one side of the driven element. The type of matching is: *
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Why can a horizontal antenna closer to ground be advantageous for close range communications on lower HF bands? *
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For a 3-element Yagi antenna with horizontally mounted elements, how does the main lobe takeoff angle vary with height above flat ground? *
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For an antenna tuner of the "L" type, which of the following statements is false? *
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Why is an L-network of limited utility in impedance matching? *
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The feed point in a centre-fed half-wave antenna is at the point of: *
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The impedance of a half-wave antenna at its centre is low, because at this point: *
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What type of polarization is produced by crossed dipoles fed 90 degrees out of phase? *
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In a half-wave dipole, the lowest distribution of _________ occurs at the middle. *
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In a half-wave dipole, the highest distribution of ________ occurs at the middle. *
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Compared with coaxial cable, microstripline: *
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If the overall gain of an amateur station is increased by 3 dB the ERP (Effective Radiated Power) will: *
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Which of the following is an advantage of waveguide as a transmission line? *
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For an antenna tuner of the "Series" type, which of the following statements is false? *
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How can the approximate beamwidth of a beam antenna be determined? *
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A quarter-wave stub, for use at 15 MHz, is made from a coaxial cable having a velocity factor of 0.8. Its physical length will be: *
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Which of the following statements about waveguide IS NOT correct? *
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On VHF/UHF frequencies, Doppler shift becomes of consequence on which type of communication? *
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In a half-wave dipole, where does the minimum impedance occur? *
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Why is the physical length of a coaxial cable shorter than its electrical length? *
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For VHF and UHF signals over a fixed path, what extra loss can be expected when linearly-polarized antennas are crossed-polarized (90 degrees)? *
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What term describes an unbalanced feed system in which the driven element of an antenna is fed both at the centre and a fraction of a wavelength to one side of centre? *
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The impedance at the centre of a dipole antenna more than 3 wavelengths above ground would be nearest to: *
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