On which HF and/or MF amateur bands are there portions where General class licensees cannot transmit?
Which of the following amateur bands is restricted to communication only on specific channels, rather than frequency ranges?
On which of the following frequencies are General class licensees prohibited from operating as control operator?
Which of the following applies when the FCC rules designate the amateur service as a secondary user on a band?
On which amateur frequencies in the 10-meter band may stations with a General class control operator transmit CW emissions?
When General class licensees are not permitted to use the entire voice portion of a band, which portion of the voice segment is available to them?
What is the maximum height above ground for an antenna structure not near a public use airport without requiring notification to the FAA and registration with the FCC?
Under what conditions are state and local governments permitted to regulate amateur radio antenna structures?
What are the restrictions on the use of abbreviations or procedural signals in the amateur service?
When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission?
Who or what determines "good engineering and good amateur practice" as applied to the operation of an amateur station in all respects not covered by the Part 97 rules?
What is the maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band?
What is the limit for transmitter power on the 28 MHz band for a General Class control operator?
Who may receive partial credit for the elements represented by an expired amateur radio license?
What license examinations may you administer as an accredited Volunteer Examiner holding a General class operator license?
On which of the following band segments may you operate if you are a Technician class operator and have an unexpired Certificate of Successful Completion of Examination (CSCE) for General class privileges?
When operating a US station by remote control from outside the country, what license is required of the control operator?
Until an upgrade to General class is shown in the FCC database, when must a Technician licensee identify with "AG" after their call sign?
Which of the following criteria must be met for a non-US citizen to be an accredited Volunteer Examiner?
How long is a Certificate of Successful Completion of Examination (CSCE) valid for exam element credit?
What action is required to obtain a new General class license after a previously held license has expired and the two-year grace period has passed?
When operating a station in South America by remote control over the internet from the US, what regulations apply?
Which of the following would disqualify a third party from participating in sending a message via an amateur station?
When may a 10-meter repeater retransmit the 2-meter signal from a station that has a Technician class control operator?
What is required to conduct communications with a digital station operating under automatic control outside the automatic control band segments?
Which of the following conditions require a licensed amateur radio operator to take specific steps to avoid harmful interference to other users or facilities?
What are the restrictions on messages sent to a third party in a country with which there is a Third-Party Agreement?
The frequency allocations of which ITU region apply to radio amateurs operating in North and South America?
In what part of the 2.4 GHz band may an amateur station communicate with non-licensed Wi-Fi stations?
Under what circumstances are messages that are sent via digital modes exempt from Part 97 third-party rules that apply to other modes of communication?
Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz?
On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?
Which mode is most commonly used for voice communications on frequencies of 14 MHz or higher?
Which mode is most commonly used for voice communications on the 160-, 75-, and 40-meter bands?
Which of the following is an advantage of using single sideband, as compared to other analog voice modes on the HF amateur bands?
What is the first thing you should do if you are communicating with another amateur station and hear a station in distress break in?
What is good amateur practice if propagation changes during a contact creating interference from other stations using the frequency?
When selecting a CW transmitting frequency, what minimum separation from other stations should be used to minimize interference to stations on adjacent frequencies?
When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?
How can you avoid harmful interference on an apparently clear frequency before calling CQ on CW or phone?
Which of the following complies with commonly accepted amateur practice when choosing a frequency on which to initiate a call?
What is the voluntary band plan restriction for US stations transmitting within the 48 contiguous states in the 50.1 MHz to 50.125 MHz band segment?
Who may be the control operator of an amateur station transmitting in RACES to assist relief operations during a disaster?
How often may RACES training drills and tests be routinely conducted without special authorization?
What procedure may be used by Volunteer Monitors to localize a station whose continuous carrier is holding a repeater on in their area?
Which of the following is good practice when choosing a transmitting frequency to answer a station calling CQ using FT8?
Which of the following is a way to establish contact with a digital messaging system gateway station?
What is the primary purpose of an Amateur Radio Emergency Data Network (AREDN) mesh network?
What could be wrong if you cannot decode an RTTY or other FSK signal even though it is apparently tuned in properly?
What effect does a sudden ionospheric disturbance have on the daytime ionospheric propagation?
Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?
Which of the following are the least reliable bands for long-distance communications during periods of low solar activity?
At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?
How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?
What is a characteristic of skywave signals arriving at your location by both short-path and long-path propagation?
Which of the following is a way to determine current propagation on a desired band from your station?
How does the ionosphere affect radio waves with frequencies below the MUF and above the LUF?
What is the approximate maximum distance along the Earth's surface normally covered in one hop using the F2 region?
What is the approximate maximum distance along the Earth's surface normally covered in one hop using the E region?
Why is skip propagation via the F2 region longer than that via the other ionospheric regions?
Why is long-distance communication on the 40-, 60-, 80-, and 160-meter bands more difficult during the day?
What type of propagation allows signals to be heard in the transmitting station's skip zone?
Which ionospheric region is the most absorbent of signals below 10 MHz during daylight hours?
What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier's TUNE control?
What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?
What is the purpose of delaying RF output after activating a transmitter's keying line to an external amplifier?
Which of the following is the best instrument to use for checking the keying waveform of a CW transmitter?
What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?
Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
Which of the following might be useful in reducing RF interference to audio frequency circuits?
Which of the following could be a cause of interference covering a wide range of frequencies?
What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter?
What sound is heard from an audio device experiencing RF interference from a CW transmitter?
Which of the following would reduce RF interference caused by common-mode current on an audio cable?
How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?
How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9?
What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
How close to the lower edge of a band's phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?
How close to the upper edge of a band's phone segment should your displayed carrier frequency be when using 3 kHz wide USB?
Which of the following direct, fused power connections would be the best for a 100-watt HF mobile installation?
Why should DC power for a 100-watt HF transceiver not be supplied by a vehicle's auxiliary power socket?
What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?
Which of the following may cause receive interference to an HF transceiver installed in a vehicle?
What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?
Why should a series diode be connected between a solar panel and a storage battery that is being charged by the panel?
What precaution should be taken when connecting a solar panel to a lithium iron phosphate battery?
How does the total current relate to the individual currents in a circuit of parallel resistors?
How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?
How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?
What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?
Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?
What is the voltage output of a transformer with a 500-turn primary and a 1500-turn secondary when 120 VAC is applied to the primary?
What transformer turns ratio matches an antenna's 600-ohm feed point impedance to a 50-ohm coaxial cable?
What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?
What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?
What is the capacitance of a 20-microfarad capacitor connected in series with a 50-microfarad capacitor?
Which of the following components should be added to a capacitor to increase the capacitance?
Which of the following components should be added to an inductor to increase the inductance?
What is the minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery?
Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?
How does a ferrite bead or core reduce common-mode RF current on the shield of a coaxial cable?
Which of these connector types is commonly used for low frequency or dc signal connections to a transceiver?
What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
Which of the following is characteristic of a switchmode power supply as compared to a linear power supply?
For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?
Which of the following is an advantage of a digital signal processing (DSP) filter compared to an analog filter?
What is the phase difference between the I and Q RF signals that software-defined radio (SDR) equipment uses for modulation and demodulation?
What is the frequency above which a low-pass filter's output power is less than half the input power?
What is the name of the process that changes the phase angle of an RF signal to convey information?
What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?
What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?
What is meant by the term "flat-topping" when referring to an amplitude-modulated phone signal?
Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?
What is the term for interference from a signal at twice the IF frequency from the desired signal?
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
What combination of a mixer's Local Oscillator (LO) and RF input frequencies is found in the output?
What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?
What action results from a failure to exchange information due to excessive transmission attempts when using an ARQ mode?
Which of the following narrow-band digital modes can receive signals with very low signal-to-noise ratios?
What is indicated on a waterfall display by one or more vertical lines on either side of a data mode or RTTY signal?
Which of the following factors determine the characteristic impedance of a parallel conductor feed line?
If the SWR on an antenna feed line is 5:1, and a matching network at the transmitter end of the feed line is adjusted to present a 1:1 SWR to the transmitter, what is the resulting SWR on the feed line?
What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?
What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?
Which of the following is a common way to adjust the feed point impedance of an elevated quarter-wave ground-plane vertical antenna to be approximately 50 ohms?
Which of the following best describes the radiation pattern of a quarter-wave ground-plane vertical antenna?
What is the radiation pattern of a dipole antenna in free space in a plane containing the conductor?
How does antenna height affect the azimuthal radiation pattern of a horizontal dipole HF antenna at elevation angles higher than about 45 degrees?
How does the feed point impedance of a horizontal 1/2 wave dipole antenna change as the antenna height is reduced to 1/10 wavelength above ground?
How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?
Which of the following is an advantage of using a horizontally polarized as compared to a vertically polarized HF antenna?
How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?
What is the primary effect of increasing boom length and adding directors to a Yagi antenna?
In free space, how does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?
Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?
Which of the following antenna types will be most effective as a near vertical incidence skywave (NVIS) antenna for short-skip communications on 40 meters during the day?
In which direction or directions does an electrically small loop (less than 1/10 wavelength in circumference) have nulls in its radiation pattern?
What must you do if an evaluation of your station shows that the RF energy radiated by your station exceeds permissible limits for possible human absorption?
Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?
What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?
Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?
According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?