All 409 questions
T1 Commission's Rules
- T1A01Which of the following is part of the Basis and Purpose of the Amateur Radio Service?
- T1A02Which agency regulates and enforces the rules for the Amateur Radio Service in the United States?
- T1A03What do the FCC rules state regarding the use of a phonetic alphabet for station identification in the Amateur Radio Service?
- T1A04How do you receive official notification of your new license and call sign after passing the exam?
- T1A05What proves that the FCC has issued an operator/primary license grant?
- T1A06On which of the following HF frequencies can automatically controlled amateur propagation beacons be found?
- T1A07What is the FCC Part 97 definition of a space station?
- T1A08Who recommends transmit/receive channels for repeater and auxiliary stations?
- T1A09Who selects a Frequency Coordinator?
- T1A10Besides an FCC-issued amateur operator license, what is required to be the control operator of a Radio Amateur Civil Emergency Service (RACES) Station?
- T1A11Which of the following is prohibited?
- T1B01Which of the following frequency ranges are available for phone operation by Technician licensees?
- T1B02Which of the following U.S. amateur radio operators are allowed to contact the International Space Station (ISS) on VHF bands?
- T1B03Which frequency is in the 6-meter amateur band?
- T1B04Which amateur band includes 146.52 MHz?
- T1B05Which of the following bands include frequencies where Technicians are authorized to use digital modes such as FT8?
- T1B06On which HF bands does a Technician class operator have phone privileges?
- T1B07Which of the following VHF/UHF band segments are limited to CW only?
- T1B08How are US amateurs restricted in segments of bands where the Amateur Radio Service is secondary?
- T1B09Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band?
- T1B10Where may SSB phone be used in amateur bands above 50 MHz?
- T1B11What is the maximum peak envelope power output for Technician class operators in their HF band segments?
- T1B12Except for some specific restrictions, what is the maximum peak envelope power output for Technician class operators using frequencies above 30 MHz?
- T1C01For which classes of amateur radio licenses does the FCC currently issue new licenses?
- T1C02Who may select a desired call sign under the vanity call sign rules?
- T1C03What types of international communications are FCC-licensed amateur radio stations permitted to make?
- T1C04What may happen if the FCC is unable to reach you by email?
- T1C05Which of the following is a valid Group D call sign format for Technician class?
- T1C06Which of the following statements is true about using your amateur radio license when operating aboard a vessel or craft in international waters?
- T1C07How long before the expiration date may an amateur radio license renewal be requested?
- T1C08What is the normal term for an FCC-issued amateur radio license?
- T1C09What is the grace period for renewal if an amateur license expires?
- T1C10How soon after passing the examination for your first amateur radio license may you transmit on the amateur radio bands?
- T1C11If your license has expired and is still within the allowable grace period, may you continue to transmit on the amateur radio bands?
- T1D01With which countries are FCC-licensed amateur radio stations prohibited from exchanging communications?
- T1D02Under which of the following circumstances are one-way transmissions by an amateur station prohibited?
- T1D03When is it permissible to transmit messages encoded to obscure their meaning?
- T1D04Under what conditions is an amateur station authorized to transmit music using a phone emission?
- T1D05When may amateur radio operators use their stations to notify other amateurs of the availability of equipment for sale or trade?
- T1D06What, if any, are the restrictions concerning transmission of language that may be considered indecent or obscene?
- T1D07Which of the following is an example of an auxiliary station?
- T1D08In which of the following circumstances may the control operator of an amateur station receive compensation for operating that station?
- T1D09When may amateur stations transmit information in support of broadcasting, program production, or news gathering, assuming no other means is available?
- T1D10How does the FCC define broadcasting for the Amateur Radio Service?
- T1D11When may an amateur station transmit without identifying on the air?
- T1D12Which of the following is required when making on-the-air test transmissions?
- T1E01When may an amateur station transmit without a control operator?
- T1E02Who may be the control operator of a station communicating through an amateur satellite or space station?
- T1E03Who must designate the station control operator?
- T1E04What determines the transmitting frequency privileges of an amateur station?
- T1E05What is an amateur station's control point?
- T1E06When, other than during an emergency, may a Technician class licensee be the control operator of a station operating in an Amateur Extra Class band segment?
- T1E07When the control operator is not the station licensee, who is responsible for the proper operation of the station?
- T1E08Which of the following is an example of automatic control?
- T1E09Which amateur stations may be remotely controlled?
- T1E10Which of the following is an example of remote control as defined in Part 97?
- T1E11What is a control operator as defined in Part 97?
- T1F01When must the station licensee make the station and the station records available for inspection?
- T1F02How often must you identify with your FCC-assigned call sign when using tactical call signs such as “Race Headquarters”?
- T1F03When are you required to transmit your assigned call sign?
- T1F04What language must you use for identification when using a phone emission?
- T1F05What method of call sign identification is required for a station transmitting phone signals?
- T1F06Which of the following self-assigned indicators are acceptable when using a phone transmission?
- T1F07Which of the following restrictions apply when a non-licensed person speaks to a foreign amateur radio station via a station under the control of an FCC-licensed amateur radio operator?
- T1F08What is the definition of third-party communications?
- T1F09What type of amateur station simultaneously retransmits the signal of another amateur station on a different channel or channels?
- T1F10Who is accountable if a repeater inadvertently retransmits communications that violate the FCC rules?
- T1F11Which of the following is a requirement for the issuance of a club station license grant?
T2 Operating Procedures
- T2A01What is a common repeater frequency offset in the 2-meter band?
- T2A02What is the national calling frequency for FM simplex operations in the 2-meter band?
- T2A03What is a common repeater frequency offset in the 70-centimeter band?
- T2A04What is an appropriate way to call another station on a repeater if you know the other station's call sign?
- T2A05How should you respond to a station calling CQ?
- T2A06What is an effective way to seek a call from any phone station when not using a repeater?
- T2A07What does the term "repeater offset" mean?
- T2A08What is the meaning of the procedural signal “CQ”?
- T2A09Which of the following is a customary way to indicate a station is listening on a repeater and looking for a contact?
- T2A10What is a band plan, beyond the privileges established by the FCC?
- T2A11What term describes an amateur station that is transmitting and receiving on the same frequency?
- T2B01What is the purpose of the reverse function on a VHF/UHF transceiver?
- T2B02What term describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver?
- T2B03Which of the following describes a linked repeater network?
- T2B04Which of the following could be the reason you are unable to access a repeater whose output you can hear?
- T2B05Which of the following would cause your FM transmission audio to drop out on voice peaks?
- T2B06What type of signaling to a repeater uses two simultaneous audio tones?
- T2B07How can you join a digital repeater's “talkgroup”?
- T2B08Which of the following applies when two stations transmitting on the same frequency interfere with each other?
- T2B09Why are simplex channels designated in the VHF/UHF band plans?
- T2B10Which Q signal indicates that you are receiving interference from other stations?
- T2B11Which Q signal indicates that you are changing frequency?
- T2B12What is the digital color code used on DMR repeater systems?
- T2B13What is the purpose of a squelch function?
- T2B14Which of the following is a “talkgroup”?
- T2C01When do the FCC Part 97 Amateur Radio Service rules NOT apply to the operation of an amateur station?
- T2C02Which of the following are typical duties of a Net Control Station?
- T2C03What technique is used to ensure that voice messages containing unusual words are received correctly?
- T2C04What is RACES?
- T2C05What does the term “traffic” refer to in net operation?
- T2C06What is the Amateur Radio Emergency Service (ARES)?
- T2C07Which of the following is standard practice when you participate in a net?
- T2C08Which of the following relays messages using email addresses based on amateur callsigns?
- T2C09Are amateur station control operators ever permitted to operate outside the frequency privileges of their license class?
- T2C10What information is contained in the preamble of a formal traffic message?
- T2C11What is meant by “check” in a radiogram header?
- T2C12Which of the following requires certification by a civil defense agency?
T3 Radio Wave Propagation
- T3A01Why do VHF signal strengths sometimes vary greatly when the antenna is moved only a few feet?
- T3A02How does vegetation affect UHF and microwave signals?
- T3A03What antenna polarization is normally used for long-distance CW and SSB contacts on the VHF and UHF bands?
- T3A04What is the effect of antenna cross-polarization over a line-of-sight VHF or UHF path?
- T3A05When using a directional antenna, how might your station be able to communicate with a distant repeater if buildings or obstructions are blocking the direct line of sight path?
- T3A06What is the meaning of the term “picket fencing”?
- T3A07What weather condition might decrease range at microwave frequencies?
- T3A08What is a likely cause of irregular fading of signals propagated by the ionosphere?
- T3A09Which of the following results from the fact that signals propagated by the ionosphere are elliptically polarized?
- T3A10What effect does multi-path propagation have on data transmissions?
- T3A11Which region of the atmosphere can reflect HF radio waves?
- T3A12What effect does fog or rain have on 10-meter and 6-meter band signals?
- T3B01What is the relationship between the electric and magnetic fields of an electromagnetic wave?
- T3B02What property of a radio wave defines its polarization?
- T3B03What are the two components of a radio wave?
- T3B04What is the velocity of a radio wave traveling through free space?
- T3B05What is the relationship between wavelength and frequency?
- T3B06What is the formula for converting frequency to approximate wavelength in meters?
- T3B07In addition to frequency, which of the following is used to identify amateur radio bands?
- T3B08What frequency range is referred to as VHF?
- T3B09What frequency range is referred to as UHF?
- T3B10What frequency range is referred to as HF?
- T3B11What is the approximate velocity of a radio wave in free space?
- T3B12Which of these frequencies travels at the highest velocity in free space?
- T3C01Why are simplex UHF signals rarely heard beyond their radio horizon?
- T3C02What is a characteristic of HF communication compared with communications on VHF and higher frequencies?
- T3C03What is one characteristic of VHF signals received via auroral backscatter?
- T3C04Which of the following types of propagation is most commonly associated with occasional strong signals on the 10-, 6-, and 2-meter bands from beyond the radio horizon?
- T3C05Which of the following effects may allow radio signals to travel beyond obstructions between the transmitting and receiving stations?
- T3C06What type of propagation is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?
- T3C07What band is best suited for communicating via meteor scatter?
- T3C08What causes tropospheric ducting?
- T3C09What is generally the best time for long-distance 10-meter band propagation via the F region?
- T3C10Which of the following bands may provide long-distance communications via the ionosphere's F region during the peak of the sunspot cycle?
- T3C11Why is the radio horizon for VHF and UHF signals more distant than the visual horizon?
T4 Amateur Radio Practices
- T4A01Which of the following is an appropriate power supply rating for a typical 50-watt output mobile FM transceiver?
- T4A02Which of the following should be considered when selecting an accessory SWR meter?
- T4A03Why are short, heavy-gauge wires used for a transceiver's DC power connection?
- T4A04How are the audio input and output of a transceiver connected in a station configured to operate using FT8?
- T4A05Where should an RF power meter be installed?
- T4A06What signals are used in a computer-radio interface for digital mode operation?
- T4A07Which of the following is one of the connections required between a computer and a transceiver to operate digital modes?
- T4A08Which of the following conductors is preferred for bonding at RF?
- T4A09How can you determine the length of time that equipment can be powered from a battery?
- T4A10What function does a digital mode hotspot perform for nearby transceivers?
- T4A11Where should the negative power return of a mobile transceiver be connected in a vehicle?
- T4A12What is an electronic keyer?
- T4B01What is the effect of excessive microphone gain on SSB transmissions?
- T4B02Which of the following can be used to enter a transceiver's operating frequency?
- T4B03How is squelch adjusted so that a weak FM signal can be heard?
- T4B04What does an FM signal sound like when received slightly off frequency?
- T4B05What does the scanning function of an FM transceiver do?
- T4B06Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low?
- T4B07What is a DMR “code plug”?
- T4B08What is the advantage of having a choice of receiver filter bandwidths in a multimode transceiver?
- T4B09How is a specific group of stations selected on a DMR digital voice transceiver?
- T4B10Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception?
- T4B11Which of the following must be programmed into a D-STAR digital transceiver before transmitting?
T5 Electrical Principles
- T5A01Electrical current is measured in which of the following units?
- T5A02Electrical power is measured in which of the following units?
- T5A03What is the term for the flow of electrons in an electric circuit?
- T5A04What term describes the number of times per second that an alternating current makes a complete cycle?
- T5A05A difference in which of the following causes electron flow?
- T5A06What is the unit of frequency?
- T5A07Why are metals generally good conductors of electricity?
- T5A08Which of the following is a good electrical insulator?
- T5A09Which of the following describes alternating current?
- T5A10Which term describes the rate at which electrical energy is used?
- T5A11What type of current flow is opposed by resistance?
- T5B01How many milliamperes is 1.5 amperes?
- T5B02Which is equal to 1,500,000 hertz?
- T5B03Which is equal to one kilovolt?
- T5B04Which is equal to one microvolt?
- T5B05Which is equal to 500 milliwatts?
- T5B06Which is equal to 3000 milliamperes?
- T5B07Which is equal to 3.525 MHz?
- T5B08Which is equal to 1,000,000 picofarads?
- T5B09Which decibel value most closely represents a power increase from 5 watts to 10 watts?
- T5B10Which decibel value most closely represents a power decrease from 12 watts to 3 watts?
- T5B11Which decibel value represents a power increase from 20 watts to 200 watts?
- T5B12Which is equal to 28400 kHz?
- T5B13Which is equal to 2425 MHz?
- T5C01What describes the ability to store energy in an electric field?
- T5C02What is the unit of capacitance?
- T5C03What describes the ability to store energy in a magnetic field?
- T5C04What is the unit of inductance?
- T5C05What is the unit of impedance?
- T5C06What is the abbreviation for kilohertz?
- T5C07What is the abbreviation for megahertz?
- T5C08What formula is used to calculate electrical power (P) in a DC circuit?
- T5C09How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes?
- T5C10How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes?
- T5C11How much current is required to deliver 120 watts at a voltage of 12 volts DC?
- T5C12What is impedance?
- T5D01What formula is used to calculate current in a circuit?
- T5D02What formula is used to calculate voltage in a circuit?
- T5D03What formula is used to calculate resistance in a circuit?
- T5D04What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts?
- T5D05What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?
- T5D06What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
- T5D07What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
- T5D08What is the current through a 100-ohm resistor connected across 200 volts?
- T5D09What is the current through a 24-ohm resistor connected across 240 volts?
- T5D10What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
- T5D11What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
- T5D12What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
- T5D13In which type of circuit is the current always the same through all components?
- T5D14In which type of circuit is the voltage always the same across all components?
T6 Electronic and Electrical Components
- T6A01What electrical component opposes the flow of current in a DC circuit?
- T6A02What type of component is often used as an adjustable volume control?
- T6A03What electrical parameter is controlled by a potentiometer?
- T6A04What electrical component stores energy in an electric field?
- T6A05What type of electrical component consists of conductive surfaces separated by an insulator?
- T6A06What type of electrical component stores energy in a magnetic field?
- T6A07What electrical component is typically constructed as a coil of wire?
- T6A08What is the function of an SPDT switch?
- T6A09What type of switch is represented by component 3 in figure T-2?
- T6A10Which of the following battery chemistries is rechargeable?
- T6A11Which of the following battery chemistries is not rechargeable?
- T6B01Which is true about forward voltage drop in a diode?
- T6B02What electronic component allows current to flow in only one direction?
- T6B03Which of these components can be used as an electronic switch?
- T6B04Which of the following components can consist of three regions of semiconductor material?
- T6B05What type of transistor has a gate, drain, and source?
- T6B06How is the cathode lead of a semiconductor diode often marked on the package?
- T6B07What causes a light-emitting diode (LED) to emit light?
- T6B08What does the abbreviation FET stand for?
- T6B09What are the names for the electrodes of a diode?
- T6B10Which of the following can provide power gain?
- T6B11What does the term gain mean in amplifiers?
- T6B12What are the names of the electrodes of a bipolar junction transistor?
- T6C01What is an electrical diagram using standard component symbols called?
- T6C02What is component 1 in figure T-1?
- T6C03What is component 2 in figure T-1?
- T6C04What is component 3 in figure T-1?
- T6C05What is component 4 in figure T-1?
- T6C06What is component 6 in figure T-2?
- T6C07What is component 8 in figure T-2?
- T6C08What is component 9 in figure T-2?
- T6C09What is component 4 in figure T-2?
- T6C10What is component 3 in figure T-3?
- T6C11What is component 4 in figure T-3?
- T6C12Which of the following is accurately represented in electrical schematics?
- T6D01Which of the following devices or circuits changes an alternating current into a varying direct current signal?
- T6D02What is a relay?
- T6D03Which of the following is a reason to use shielded wire?
- T6D04Which of the following displays an electrical quantity as a numeric value?
- T6D05What type of circuit controls the amount of voltage from a power supply?
- T6D06What component changes 120 V AC power to a lower AC voltage for other uses?
- T6D07Which of the following is commonly used as a visual indicator?
- T6D08Which of the following is combined with an inductor to make a resonant circuit?
- T6D09What is the name of a device that combines several semiconductors and other components into one package?
- T6D10What is the function of component 2 in figure T-1?
- T6D11Which of the following is a resonant or tuned circuit?
T7 Practical Circuits
- T7A01Which term describes the ability of a receiver to detect the presence of a signal?
- T7A02What is a transceiver?
- T7A03Which of the following is used to convert a signal from one frequency to another?
- T7A04Which term describes the ability of a receiver to discriminate between multiple signals?
- T7A05What is the name of a circuit that generates a signal at a specific frequency?
- T7A06What device converts the RF input and output of a transceiver to another band?
- T7A07What is the function of a transceiver's PTT input?
- T7A08Which of the following describes combining speech with an RF carrier signal?
- T7A09What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?
- T7A10What can be added to the output of a transceiver to increase the transmitted output power?
- T7A11What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?
- T7B01What can you do if you are told your FM handheld or mobile transceiver is over-deviating?
- T7B02What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?
- T7B03Which of the following can cause radio frequency interference?
- T7B04Which of the following might be the cause of low RF power output from a solid-state transceiver?
- T7B05Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?
- T7B06Which of the following actions should you take if a neighbor tells you that your station's transmissions are interfering with their radio or TV reception?
- T7B07Which of the following can reduce interference to a 2-meter band transceiver from a nearby commercial FM station?
- T7B08What should you do if something in a neighbor's home is causing harmful interference to your amateur station?
- T7B09What should be the first step to resolve non-fiber optic cable TV interference caused by your amateur radio transmission?
- T7B10What might be a problem if you receive a report that your audio signal through an FM repeater is distorted or unintelligible?
- T7B11Which of the following can eliminate distorted voice transmissions?
- T7C01What is the primary purpose of a dummy load?
- T7C02Which of the following is used to determine if an antenna is resonant at the desired operating frequency?
- T7C03What does a typical RF dummy load consist of?
- T7C04What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?
- T7C05Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?
- T7C06What does an SWR reading of 4:1 indicate?
- T7C07What happens to power lost in a feed line?
- T7C08Which instrument can be used to determine SWR?
- T7C09Which of the following causes failure of coaxial cables?
- T7C10Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
- T7C11What is an advantage of foam-dielectric versus solid-dielectric coaxial cable?
- T7D01Which instrument would you use to measure electric potential?
- T7D02How is a voltmeter connected to a component to measure applied voltage?
- T7D03When configured to measure current, how is a multimeter connected to a component?
- T7D04Which instrument is used to measure electric current?
- T7D05How does an ohmmeter measure the resistance of a circuit or component?
- T7D06Which of the following can damage a multimeter?
- T7D07Which of the following measurements are made using a multimeter?
- T7D08Which of the following types of solder should not be used for radio and electronic applications?
- T7D09What is the characteristic appearance of a cold tin-lead solder joint?
- T7D10What reading indicates that an ohmmeter is connected across a large, discharged capacitor?
- T7D11Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?
T8 Signals and Emissions
- T8A01Which of the following is a form of amplitude modulation?
- T8A02What type of modulation is commonly used for VHF packet radio transmissions?
- T8A03Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?
- T8A04Which type of modulation is commonly used for VHF and UHF voice repeaters?
- T8A05Which of the following signal types has the narrowest bandwidth?
- T8A06Which sideband is normally used for 10-meter HF, VHF, and UHF single-sideband communications?
- T8A07What is one characteristic of single sideband (SSB) compared to FM?
- T8A08What is the approximate bandwidth of a typical single sideband (SSB) voice signal?
- T8A09What is the approximate bandwidth of an FM voice signal on VHF repeaters?
- T8A10What is the approximate bandwidth of AM fast-scan TV transmissions?
- T8A11What is the approximate bandwidth required to transmit a CW signal?
- T8A12Which of the following is a disadvantage of FM compared with single sideband?
- T8B01What telemetry information is typically transmitted by satellite beacons?
- T8B02What is the impact of using excessive effective radiated power on a satellite uplink?
- T8B03Which of the following are provided by satellite tracking programs?
- T8B04What mode of transmission is commonly used by amateur radio satellites?
- T8B05What is a satellite beacon?
- T8B06Which of the following are inputs to a satellite tracking program?
- T8B07What is Doppler shift in reference to satellite communications?
- T8B08What does it mean if a satellite is operating in U/V mode?
- T8B09What causes spin fading of satellite signals?
- T8B10What does the term LEO mean in reference to communication satellites?
- T8B11Who is permitted to receive telemetry from an amateur radio satellite?
- T8B12Which of the following is a way to determine whether your satellite uplink power into a linear transponder satellite is neither too low nor too high?
- T8C01Which of the following methods is used to locate sources of noise interference or jamming?
- T8C02Which of these items would be useful for a hidden transmitter hunt?
- T8C03What operating activity involves contacting as many stations as possible during a specified period?
- T8C04Which of the following is good practice when contacting another station in a contest?
- T8C05What is a grid locator?
- T8C06How is over the air access to Internet Radio Linking Project (IRLP) nodes accomplished?
- T8C07What is Voice Over Internet Protocol (VoIP)?
- T8C08What is the Internet Radio Linking Project (IRLP)?
- T8C09Which of the following protocols enables an amateur station to transmit through a repeater without using a radio to initiate the transmission?
- T8C10What is required before using the EchoLink system?
- T8C11What is an amateur radio station that connects other amateur stations to the internet?
- T8D01Which of the following is a digital communications mode?
- T8D02What is FT8?
- T8D03What kind of data can be transmitted by APRS?
- T8D04What is meant by the term "NTSC?"
- T8D05Which of the following is an application of APRS?
- T8D06What does the abbreviation "PSK" mean?
- T8D07Which of the following describes DMR?
- T8D08Which of the following is included in packet radio transmissions?
- T8D09What is CW?
- T8D10Which of the following operating activities is supported by digital mode software in the WSJT-X software suite?
- T8D11What is the role of ARQ in a transmission system?
- T8D12Which of the following best describes an amateur radio mesh network?
T9 Antennas and Feed Lines
- T9A01What is a beam antenna?
- T9A02Which of the following describes a type of antenna loading?
- T9A03How is the polarization of an antenna described?
- T9A04What is a disadvantage of a handheld radio transceiver's short flexible antenna compared to a full-sized quarter-wave antenna?
- T9A05Which of the following increases the resonant frequency of a dipole antenna?
- T9A06Which of the following types of antennas offers the greatest gain?
- T9A07What is a potential drawback of using a handheld VHF transceiver inside a vehicle that lacks an externally mounted antenna?
- T9A08Why is a 19-inch-long vertical antenna often used on 2 meters?
- T9A09What is an advantage of a 5/8-wavelength whip antenna for VHF or UHF mobile service compared to a 1/4-wave antenna?
- T9A10In which direction does a half-wave dipole antenna radiate the strongest signal?
- T9A11What is antenna gain?
- T9B01Which of the following connectors should be carefully taped for weather protection when used outdoors?
- T9B02What is the most common impedance of coaxial cables used in amateur radio?
- T9B03Why is coaxial cable the most common feed line for amateur radio antenna systems?
- T9B04What is the major function of an antenna tuner (antenna coupler)?
- T9B05What happens as the frequency of a signal in coaxial cable is increased?
- T9B06Which of the following connector types is most suitable as an RF connector for frequencies above 400 MHz?
- T9B07Which of the following is true of PL-259 type coax connectors?
- T9B08Which of the following is a source of loss in coaxial feed line?
- T9B09What can cause erratic changes in SWR?
- T9B10What is the electrical difference between RG-58 and RG-213 coaxial cable?
- T9B11Which of the following types of feed line has the lowest loss?
- T9B12What is standing wave ratio (SWR)?
T0 Safety
- T0A01Which of the following is a safety hazard of a 12-volt storage battery that lacks internal protection circuitry?
- T0A02What health hazard is posed by electrical current flowing through the body?
- T0A03In the United States, what circuit does black wire insulation indicate in a three-wire 120 V AC cable?
- T0A04What is the purpose of a fuse in an electrical circuit?
- T0A05Why should a 5-ampere fuse never be replaced with a 20-ampere fuse?
- T0A06What is a good way to guard against electrical shock at your station?
- T0A07Where should a lightning arrester be installed in a coaxial feed line?
- T0A08Where should a fuse or circuit breaker be installed in a 120V AC power circuit?
- T0A09What should be done to all external ground rods or earth connections?
- T0A10What hazard exists when rapidly charging or discharging an unprotected battery?
- T0A11What hazard exists in a power supply immediately after turning it off?
- T0A12Which of the following precautions should be taken when measuring high voltages with a voltmeter?
- T0B01Which of the following is good practice when installing ground wires on a tower for lightning protection?
- T0B02What is required when climbing an antenna tower?
- T0B03Under what circumstances is it safe to climb a tower without a helper or observer?
- T0B04Which of the following is an important safety precaution to observe when putting up an antenna tower?
- T0B05What is the purpose of a safety wire through a turnbuckle used to tension guy lines?
- T0B06What is the minimum safe distance from a power line to allow when installing an antenna?
- T0B07Which of the following is an important safety rule to remember when using a crank-up tower?
- T0B08Which is a proper grounding method for a tower?
- T0B09Why should you avoid attaching an antenna to a utility pole?
- T0B10Which of the following is true when installing grounding conductors used for lightning protection?
- T0B11Which of the following establishes grounding requirements for an amateur radio tower or antenna?
- T0C01What type of radiation are radio signals?
- T0C02Which of the following bands has the lowest maximum permissible exposure for RF safety?
- T0C03How does the allowable power density for RF safety change if duty cycle changes from 100 percent to 50 percent?
- T0C04What factors affect the RF exposure of people near an amateur station antenna?
- T0C05Why do exposure limits vary with frequency?
- T0C06Which of the following is an acceptable method to determine whether your station complies with FCC RF exposure regulations?
- T0C07What hazard is created by touching an antenna during a transmission?
- T0C08Which of the following actions can reduce exposure to RF radiation?
- T0C09How can you make sure your station stays in compliance with RF safety regulations?
- T0C10Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
- T0C11What is the definition of duty cycle during the averaging time for RF exposure?
- T0C12How does RF radiation differ from ionizing radiation (radioactivity)?
- T0C13Who is responsible for ensuring that no person is exposed to RF energy above the FCC exposure limits?