Exam Primer

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
  • 8.5 Filters


    What type of filter might be connected to an amateur HF transmitter to cut down on harmonic radiation?
    A low pass filter
    A key-click filter
    A high pass filter
    A CW filter

    Why do modern HF transmitters have a built-in low pass filter in their RF output circuits?
    To reduce fundamental radiation
    To reduce low frequency interference to other amateurs
    To reduce harmonic radiation
    To reduce RF energy below a cut-off point

    What circuit blocks RF energy above and below a certain limit?
    A high pass filter
    An input filter
    A low pass filter
    A band pass filter

    What should be the impedance of a low pass filter as compared to the impedance of the transmission line into which it is inserted?
    Substantially lower
    Twice the transmission line impedance
    About the same
    Substantially higher

    In order to reduce the harmonic output of a high frequency (HF) transmitter, which of the following filters should be installed at the transmitter?
    Band pass
    High pass
    Low pass

    To reduce harmonic output from a transmitter, you would put a _______ in the transmission line as close to the transmitter as possible.
    high pass filter
    low pass filter
    band reject filter
    wave trap

    To reduce energy from an HF transmitter getting into a television set, you would place a _______ as close to the TV as possible.
    low pass filter
    wave trap
    band reject filter
    high pass filter

    A band pass filter will:
    attenuate high frequencies but not low
    pass frequencies each side of a band
    allow only certain frequencies through
    stop frequencies in a certain band

    A band reject filter will:
    allow only two frequencies through
    pass frequencies each side of a band
    pass frequencies below 100 MHz
    stop frequencies each side of a band

    A high pass filter would normally be fitted:
    between microphone and speech amplifier
    at the Morse key or keying relay in a transmitter
    at the antenna terminals of the TV receiver
    between transmitter output and feed line

    A low pass filter suitable for a high frequency transmitter would:
    pass audio frequencies above 3 kHz
    attenuate frequencies below 30 MHz
    attenuate frequencies above 30 MHz
    pass audio frequencies below 3 kHz