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Which of the following injuries can result from using high-power UHF or microwave transmitters?
Who must be in physical control of the station apparatus of an amateur station aboard any vessel or craft that is documented or registered in the United States?
What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receivers involved are of good engineering design?
What notifications must be given before transmitting on the 630 meter or 2200 meter bands?
What must be posted at the station location of a station being operated by telecommand on or within 50 km of the earth's surface?
Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?
What privileges are authorized in the U.S. to persons holding an amateur service license granted by the government of Canada?
What is the direction of an ascending pass for an amateur satellite?
How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?
Which of the following best describes the term self-spotting? in connection with HF contest operating?
What type of packet frame is used to transmit APRS beacon data?
How do ALE stations establish contact?
Which of these emission modes is best for auroral propagation?
What is the best time of day for transequatorial propagation?
What type of polarization is best for ground-wave propagation?
Which of the following is good practice when using an oscilloscope probe?
Which of the following methods measures intermodulation distortion in an SSB transmitter?
What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?
Which of the following describes problems caused by poor dynamic range in a receiver?
Which of the following can cause shielded cables to radiate or receive interference?
Which of the following increases Q for inductors and capacitors?
What is the relationship between the AC current through an inductor and the voltage across an inductor?
What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of impedance?
What is the result of skin effect?
Why do many MOSFET devices have internally connected Zener diodes on the gates?
What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?
What is the function of hysteresis in a comparator?
What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?
How is power supplied to the most common type of MMIC?
Which of these materials is most commonly used to create photoconductive devices?
What type of logic defines "1" as a high voltage?
Why are switching amplifiers more efficient than linear amplifiers?
What are the distinguishing features of an elliptical filter?
How does a linear electronic voltage regulator work?
What is a frequency discriminator stage in a FM receiver?
What function is performed by a Fast Fourier Transform?
What magnitude of voltage gain can be expected from the circuit in Figure E73 when R1 is 10 ohms and RF is 470 ohms?
How is positive feedback supplied in a Pierce oscillator?
What is "dither" with respect to analog-to-digital converters?
What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?
Why should phase-shifting of a PSK signal be done at the zero crossing of the RF signal?
How does the spread spectrum technique of frequency hopping work?
How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?
What is the front-to-back ratio of the radiation pattern shown in Figure E92?
What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?
What happens to feed-point impedance at the base of a fixed length HF mobile antenna when operated below its resonant frequency?
What is the purpose of the series capacitor in a gamma-type antenna matching network?
What is the velocity factor of a transmission line?
What do the arcs on a Smith chart represent?
What is the triangulation method of direction finding?