In the PACTOR protocol, what is meant by a NAK response to a transmitted packet? Which of the following can be the result of an incorrectly adjusted speech processor? 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 describes an azimuthal projection map? What is a practical way to avoid harmful interference on an apparently clear frequency before calling CQ on CW or phone? Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring? Which digital mode is used as a low-power beacon for assessing HF propagation? What condition can lead to permanent damage to a solid-state RF power amplifier? How many states does a 3-bit binary counter have? If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver? Which symbol in figure G7-1 represents an NPN junction transistor? What is the approximate length for a 1/2 wave dipole antenna cut for 3.550 MHz? What is meant when memory is characterized as non-volatile? If three equal value resistors in series produce 450 ohms, what is the value of each resistor? Which of the following describes a linear amplifier? What is the relationship between transmitted symbol rate and bandwidth? The National Conference of Volunteer Examiner Coordinators (NCVEC) Question Pool Committee has released the 2019 – 2023 FCC Element 3 General Class Question Pool into … In what segment of the 20-meter band are most PSK31 operations commonly found? How many watts of electrical power are used if 400 VDC is supplied to an 800 ohm load? 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? What is the ratio of peak envelope power to average power for an unmodulated carrier? What is meant by the "main lobe" of a directive antenna? Why must the metal enclosure of every item of station equipment be grounded? What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz? Which of the following frequencies is within the General class portion of the 15-meter band? Which of the following amateur bands is restricted to communication only on specific channels, rather than frequency ranges? Which of the following is a good way to indicate on a clear frequency in the HF phone bands that you are looking for a contact with any station? Which of the following describes a log periodic antenna? Which of the following is a way to establish contact with a digital messaging system gateway station? What is the maximum bandwidth permitted by FCC rules for Amateur Radio stations transmitting on USB frequencies in the 60-meter band? 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? What action results from a failure to exchange information due to excessive transmission attempts when using PACTOR or WINMOR? What segment of the 80-meter band is most commonly used for digital transmissions? Which of the following may apply in areas under FCC jurisdiction outside of ITU Region 2? What is the turns ratio of a transformer used to match an audio amplifier having 600 ohm output impedance to a speaker having 4 ohm impedance? Which of the following is a characteristic of a liquid crystal display? What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage? What is likely to happen if a transceiver's ALC system is not set properly when transmitting AFSK signals with the radio using single sideband mode? When may a 10-meter repeater retransmit the 2-meter signal from a station that has a Technician class control operator? What part of a packet radio frame contains the routing and handling information? Listed below are the full pool questions for the three licenses, with only the correct answers. What is meant by the terms dBi and dBd when referring to antenna gain? View Question Pool Element 3: General. What happens as the noise reduction control level in a receiver is increased? What is the total resistance of three 100 ohm resistors in parallel? What is the maximum symbol rate permitted for RTTY or data emission transmissions on the 10-meter band? What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms? What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 200 ohm impedance? 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? Approximately how long does it take the increased ultraviolet and X-ray radiation from solar flares to affect radio propagation on Earth? How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified? What does the term "zero beat" mean in CW operation? What is the modulation envelope of an AM signal? What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output? How does the forward gain of a two-element quad antenna compare to the forward gain of a three-element Yagi antenna? At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours? Which of these connector types is commonly used for audio signals in Amateur Radio stations? Highlight correct answers. What is the standard sideband used to generate a JT65, JT9, or FT8 digital signal when using AFSK in any amateur band? What is Near Vertical Incidence Skywave (NVIS) propagation? Where should the radial wires of a ground-mounted vertical antenna system be placed? When must you add the special identifier "AG" after your call sign if you are a Technician class licensee and have a Certificate of Successful Completion of Examination (CSCE) for General class operator privileges, but the FCC has not yet posted your upgrade on its website? Which of the following properties is important in estimating whether an RF signal exceeds the maximum permissible exposure (MPE)? What is the significance of the sunspot number with regard to HF propagation? What technique helps to minimize RF "hot spots" in an amateur station? What is the simplest combination of stages that implement a superheterodyne receiver? What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control? Which of these classes of amplifiers has the highest efficiency? Which of the following are basic components of a sine wave oscillator? What circuit is used in analog FM receivers to convert IF output signals to audio? What is the purpose of a speech processor as used in a modern transceiver? Where on Earth do ionospheric layers reach their maximum height? In what units is RF feed line loss usually expressed? What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts? How is an LED biased when emitting light? When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission? What is the purpose of an electronic keyer? What determines the performance of a ferrite core at different frequencies? What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the E region? What determines the frequency of an LC oscillator? What happens when an inductor is operated above its self-resonant frequency? The General class question pool contains one schematic diagram. What is a use for an antenna analyzer other than measuring the SWR of an antenna system? Which communication system sometimes uses the internet to transfer messages? What happens to HF propagation when the LUF exceeds the MUF? What is the capacitance of three 100 microfarad capacitors connected in series? What is the effect on an audio device when there is interference from a nearby CW transmitter? Which of the following is required by the FCC rules when operating in the 60-meter band? Which of the following is a requirement when using the FT8 digital mode? What is the primary purpose of antenna traps? What circuit is used to combine signals from the IF amplifier and BFO and send the result to the AF amplifier in some single sideband receivers? What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency? Which of the following causes opposition to the flow of alternating current in an inductor? What is the approximate length for a 1/4 wave vertical antenna cut for 28.5 MHz? Which of the following can be determined with a directional wattmeter? What effect does transmitter duty cycle have when evaluating RF exposure?

general class license question pool with answers

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general class license question pool with answers 2020