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
  • 6.11 Yagi Antennas

    Practice


    B-006-11-01
    How many directly driven elements do most Yagi antennas have?
    None
    Two
    Three
    One

    B-006-11-02
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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