What term specifies a filter's attenuation inside its passband? Which type of rectifier circuit uses two diodes and a center-tapped transformer? Which HF antenna would be the best to use for minimizing interference? What is meant by the "main lobe" of a directive antenna? What is the best speed to use when answering a CQ in Morse code? What circuit is used to process signals from the RF amplifier and local oscillator then send the result to the IF filter in a superheterodyne receiver? What is the appropriate action if, when operating on either the 30-meter or 60-meter bands, a station in the primary service interferes with your contact? How does the attenuation of coaxial cable change as the frequency of the signal it is carrying increases? What happens as the noise reduction control level in a receiver is increased? What portion of the 10-meter band is available for repeater use? What does "time averaging" mean in reference to RF radiation exposure? Which of the following frequencies is available to a control operator holding a General class license? Which of the following is characteristic of QPSK31? Which of the following is a disadvantage of multiband antennas? What does the term "critical angle" mean, as used in radio wave propagation? Who may receive partial credit for the elements represented by an expired Amateur Radio license? They are Technician, General, and Extra. Which of the following is a requirement for administering a Technician class license examination? When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission? What circuit is used in analog FM receivers to convert IF output signals to audio? Which of the following can be a symptom of transmitted RF being picked up by an audio cable carrying AFSK data signals between a computer and a transceiver? In the US, the Federal Communications Commission (FCC) offers three Amateur Radio license levels or license classes; Technician class license, General class license and Extra class license.Per FCC Rule 97.523 only one question pool may exist for each license examination level. Which of the following is a reason not to use wire-wound resistors in an RF circuit? There are two versions, one edited by K8TB, and one edited by AD7FO. Why is it important to know the duty cycle of the mode you are using when transmitting? Why is the polarity of applied voltages important for polarized capacitors? Which of the following statements is true of voice VOX operation versus PTT operation? 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? What is an advantage of vertical stacking of horizontally polarized Yagi antennas? What signals are used to conduct a two-tone test? On which of the following bands is phone operation prohibited? What usually happens to radio waves with frequencies below the LUF? When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies? What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 10 ohm impedance? What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region? How does the total current relate to the individual currents in each branch of a purely resistive parallel circuit? 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 approximate length for a 1/2 wave dipole antenna cut for 3.550 MHz? What is the approximate junction threshold voltage of a germanium diode? Which mode of voice communication is most commonly used on the HF amateur bands? Which of the following is an advantage of an oscilloscope versus a digital voltmeter? What is the power limit for beacon stations? Which of the following modes is most commonly used for voice communications on the 160-meter, 75-meter, and 40-meter bands? At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours? What is the radiation pattern of a dipole antenna in free space in a plane containing the conductor? What types of messages for a third party in another country may be transmitted by an amateur station? Which of the following can be determined with a directional wattmeter? Why is a time delay sometimes included in a transmitter keying circuit? Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)? Element 2 Questions & Answers Formatted for use with: ARRL Ham Radio License Manual 3rd Edition This document displays the Technicians question pool in a Question and Answer format. Which of the following describes a waterfall display? Under what conditions are state and local governments permitted to regulate Amateur Radio antenna structures? Subelement G0 - ELECTRICAL AND RF SAFETY. Listed below are the full pool questions for the three licenses, with only the correct answers. What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal? What is the approximate junction threshold voltage of a conventional silicon diode? What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell? What is good amateur practice if propagation changes during a contact and you notice interference from other stations on the frequency? What should you do if a CW station sends "QRS"? Which of the following is an advantage of a horizontally polarized as compared to a vertically polarized HF antenna? Which of the following is good practice for lightning protection grounds? What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 2-meter band? Which symbol in Figure G7-1 represents a tapped inductor? What is the Volunteer Monitoring Program? 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? What is one advantage of selecting the opposite, or "reverse," sideband when receiving CW signals on a typical HF transceiver? What is the ratio of peak envelope power to average power for an unmodulated carrier? Which of these connector types is commonly used for audio signals in Amateur Radio stations? What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna? If the SWR on an antenna feed line is 5 to 1, and a matching network at the transmitter end of the feed line is adjusted to 1 to 1 SWR, what is the resulting SWR on the feed line? Which of the following phone emissions uses the narrowest bandwidth? Which of the following is a use for the IF shift control on a receiver? Which of the following frequencies is within the General class portion of the 75-meter phone band? In which direction or directions does an electrically small loop (less than 1/3 wavelength in circumference) have nulls in its radiation pattern? What segment of the 80-meter band is most commonly used for digital transmissions? What usually happens to radio waves with frequencies below the MUF and above the LUF when they are sent into the ionosphere? What must be done before using a new digital protocol on the air? What is the maximum power limit on the 60-meter band? General class (Element 3) Pool is effective July 1, 2019 and is valid until June 30, 2023. What portion of the AC cycle is converted to DC by a full-wave rectifier? Which of the following is a typical application for a Direct Digital Synthesizer? What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms? In what segment of the 20-meter band are most PSK31 operations commonly found? Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz? Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits? Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments? What is the capacitance of three 100 microfarad capacitors connected in series? What must be done to prevent standing waves on an antenna feed line? What is the most common frequency shift for RTTY emissions in the amateur HF bands? What is the name of the process that changes the instantaneous frequency of an RF wave to convey information? Which of the following are objectives of the Volunteer Monitoring Program? What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output? There are two versions, one edited by K8TB, and one edited by AD7FO. What segment of the 20-meter band is most often used for digital transmissions (avoiding the DX propagation beacons)? When General class licensees are not permitted to use the entire voice portion of a band, which portion of the voice segment is generally available to them? How long does it take charged particles from coronal mass ejections to affect radio propagation on Earth? What is the primary purpose of antenna traps?