Exam Primer

Overview
1. Regulations and Policies
  • Authority and Regulations
  • Licence
  • License Penalties
  • Certificate
  • Operation, Repair
  • Content Restrictions
  • Operating Restrictions
  • Interference
  • Emergencies
  • Non-remuneration, Privacy
  • Call Signs
  • Other Countries
  • Frequency Bands
  • Power Allowed
  • unmodulated carriers, retransmission
  • amplitude modulation, frequency stability, me
  • International Telecommunication Union (ITU)
  • Exams
  • Antenna Structures
  • RF Field Strength
  • Resolving Complaints
  • 2. Operating and Procedures
  • VHF/UHF Repeaters - Voice
  • Phonetic Alphabet
  • Voice Operating Procedures
  • tuning, testing and dummy loads
  • Morse Code (CW) procedures
  • RST signal reporting, S meter
  • Q Signals
  • Emergency Operating Procedures
  • Record Keeping, Antenna Orientation and Maps
  • 3. Station Assembly, Practice and Safety
  • Layout of HF Stations
  • Layout of FM Transmitters
  • Layout of FM Receivers
  • Layout of CW Transmitters
  • Layout of SSB/CW receivers
  • Layout of SSB Transmitters
  • Layout of Digital Systems
  • Layout of Regulated Power Supplies
  • Layout of Yagi-Uda Antennas
  • Receiver Fundamentals
  • Transmitter, carrier, keying, AM
  • Carrier Suppression, SSB
  • Frequency and Phase Modulation
  • Station Accessories
  • Digital Modes
  • Batteries
  • Power Supplies
  • Electrical Safety
  • Antenna and Tower Safety
  • RF Exposure Safety
  • 4. Circuit Components
  • Amplifier Fundamentals
  • Diodes
  • Bipolar Transistors
  • Field-effect Transistors
  • Tiode Vacuum Tubes
  • Resister Color Codes
  • 5. Basic Electronics and Theory
  • Metric Prefixes
  • Basic Concepts
  • Circuits
  • Ohm's law
  • Series and Parallel Resistors
  • Power law, Resister Power Disipation
  • AC and frequency
  • Ratios, Logarithms and Decibels
  • Inductance and Capacitance
  • Reactance and Impedance
  • Magnetica and Transformers
  • Resonance and Tuned Circuits
  • Meters and Measurements
  • 6. Feedlines and Antenna Systems
  • Impedance and Feedlines
  • Balanced and Unbalanced feedlines
  • Feedlines and Connectors
  • Line Losses
  • Standing Wave Ratio
  • Impedance Matching
  • Isotropic Sources, Polarization
  • Wavelength vs Physical Length
  • Antenna Radiation Patterns
  • Vertical Antennas
  • Yagi Antennas
  • Wire Antennas
  • Quad/loop Antennas
  • 7. Radio Wave Propagation
  • Propogation Types
  • Ionospheric Regions
  • Hops and Skips
  • Ionosphere Issues
  • Solar Activity
  • MF and HF and Skywaves
  • VHF and UHF, Sporadic-E, Aurira, Ducting
  • Scatter - HF, VHF, UHF
  • 8. Interference and Suppression
  • Front-end overload
  • Audio Rectification, Bypass Capacitors, Ferri
  • Intermodulation, Spurious, Key-clicks
  • Harmonics, Splatter, Transmitter Adjustments
  • Filters
  • 6.10 Vertical Antennas

    Practice


    B-006-10-01
    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
    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)

    B-006-10-03
    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
    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
    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
    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
    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
    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
    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
    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
    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