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
  • 6.6 Impedance Matching

    Practice


    B-006-06-01
    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
    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
    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
    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
    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
    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

    B-006-06-07
    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
    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
    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
    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
    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