HAM Technician T9

What is a beam antenna?
A.  An antenna built from aluminum I-beams
B.  An antenna that concentrates signals in one direction
C.  An omnidirectional antenna invented by Clarence Beam
D.  An antenna that reverses the phase of received signals

Which of the following describes a type of antenna loading?
A.  Strengthening the radiating elements of a beam antenna to better resist wind damage
B.  Inserting a resistor in the radiating portion of the antenna to make it resonant
C.  Installing a spring in the base of a mobile vertical antenna to make it more flexible
D.  Inserting an inductor in the radiating portion of the antenna to make it electrically longer

Which of the following describes a simple dipole oriented parallel to the Earth's surface?
A.  A horizontally polarized antenna
B.  A vertically polarized antenna
C.  A rhombic antenna
D.  A ground-wave antenna

What is a disadvantage of the "rubber duck" antenna supplied with most handheld radio transceivers when compared to a full-sized quarter-wave antenna?
A.  It does not transmit or receive as effectively
B.  If the rubber end cap is lost, it will unravel very easily
C.  All of these choices are correct
D.  It transmits only circularly polarized signals

How would you change a dipole antenna to make it resonant on a higher frequency?
A.  Insert coils in series with radiating wires
B.  Shorten it
C.  Lengthen it
D.  Add capacitive loading to the ends of the radiating wires

What type of antennas are the quad, Yagi, and dish?
A.  Non-resonant antennas
B.  Directional antennas
C.  Isotropic antennas
D.  Log periodic antennas

What is a disadvantage of using a handheld VHF transceiver, with its integral antenna, inside a vehicle?
A.  All of these choices are correct
B.  The SWR might decrease, decreasing the signal strength
C.  Signals might not propagate well due to the shielding effect of the vehicle
D.  It might cause the transceiver to overheat

What is the approximate length, in inches, of a quarter-wavelength vertical antenna for 146 MHz?
A.  19
B.  112
C.  50
D.  12

What is the approximate length, in inches, of a half-wavelength 6 meter dipole antenna?
A.  236
B.  112
C.  6
D.  50

In which direction does a half-wave dipole antenna radiate the strongest signal?
A.  In the direction of the feed line
B.  Equally in all directions
C.  Broadside to the antenna
D.  Off the ends of the antenna

What is the gain of an antenna?
A.  The additional power that is added to the transmitter power
B.  The additional power that is lost in the antenna when transmitting on a higher frequency
C.  The increase in impedance on receive or transmit compared to a reference antenna
D.  The increase in signal strength in a specified direction compared to a reference antenna

What is an advantage of using a properly mounted 5/8 wavelength antenna for VHF or UHF mobile service?
A.  It has very high angle radiation for better communicating through a repeater
B.  It eliminates distortion caused by reflected signals
C.  It has 10 times the power gain of a 1/4 wavelength design
D.  It has a lower radiation angle and more gain than a 1/4 wavelength antenna

Why is it important to have low SWR when using coaxial cable feed line?
A.  To reduce signal loss
B.  All of these choices are correct
C.  To prolong antenna life
D.  To reduce television interference

What is the impedance of most coaxial cables used in amateur radio installations?
A.  8 ohms
B.  600 ohms
C.  50 ohms
D.  12 ohms

Why is coaxial cable the most common feed line selected for amateur radio antenna systems?
A.  It has less loss than any other type of feed line
B.  It is less expensive than any other type of feed line
C.  It can handle more power than any other type of feed line
D.  It is easy to use and requires few special installation considerations

What is the major function of an antenna tuner (antenna coupler)?
A.  It matches the antenna system impedance to the transceiver's output impedance
B.  It helps a receiver automatically tune in weak stations
C.  It allows an antenna to be used on both transmit and receive
D.  It automatically selects the proper antenna for the frequency band being used

In general, what happens as the frequency of a signal passing through coaxial cable is increased?
A.  The loss decreases
B.  The characteristic impedance decreases
C.  The characteristic impedance increases
D.  The loss increases

Which of the following connectors is most suitable for frequencies above 400 MHz?
A.  A Type N connector
B.  A UHF (PL-259/SO-239) connector
C.  A DB-25 connector
D.  An RS-213 connector

Which of the following is true of PL-259 type coax connectors?
A.  They are commonly used at HF frequencies
B.  They are preferred for microwave operation
C.  They are a bayonet type connector
D.  They are watertight

Why should coax connectors exposed to the weather be sealed against water intrusion?
A.  All of these choices are correct
B.  To keep the jacket from becoming loose
C.  To prevent interference to telephones
D.  To prevent an increase in feed line loss

What can cause erratic changes in SWR readings?
A.  Interference from other stations is distorting your signal
B.  The transmitter is being over-modulated
C.  The transmitter is being modulated
D.  A loose connection in an antenna or a feed line

What is the electrical difference between RG-58 and RG-8 coaxial cable?
A.  RG-58 cable has two shields
B.  There is no significant difference between the two types
C.  RG-8 cable has less loss at a given frequency
D.  RG-58 cable can handle higher power levels

Which of the following types of feed line has the lowest loss at VHF and UHF?
A.  Air-insulated hard line
B.  Multi-conductor unbalanced cable
C.  75-ohm flexible coax
D.  50-ohm flexible coax