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What toxic material may be present in some electronic components such as high voltage capacitors and transformers?
If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?
To what type of regulations does PRB-1 apply?
How do the control operator responsibilities of a station under automatic control differ from one under local control?
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?
Which of the following best describes the Volunteer Examiner accreditation process?
On what frequencies are spread spectrum transmissions permitted?
Which of the following occurs when a satellite is using an inverting linear transponder?
What signals SSTV receiving software to begin a new picture line?
Which of the following contacts may be confirmed through the U.S. QSL bureau system?
Which of the following data are used by the APRS network to communicate station location?
What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?
Tropospheric propagation of microwave signals often occurs in association with what phenomenon?
What is the primary characteristic of chordal hop propagation?
What is indicated by a rising A or K index?
Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?
What is indicated if the current reading on an RF ammeter placed in series with the antenna feed line of a transmitter increases as the transmitter is tuned to resonance?
An SDR receiver is overloaded when input signals exceed what level?
Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?
How can radio frequency interference from an AC motor be suppressed?
What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries and C is 10 picofarads?
What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 100 ohms, R is 100 ohms, and XL is 75 ohms?
What does the impedance 50-j25 represent?
Why are short connections used at microwave frequencies?
In what application is gallium arsenide used as a semiconductor material?
What is the failure mechanism when a junction diode fails due to excessive current?
What happens when the level of a comparator's input signal crosses the threshold?
What is the equivalent circuit of a quartz crystal?
Which of the following device packages is a through-hole type?
Which describes an optical shaft encoder?
Which of the following can divide the frequency of a pulse train by 2?
What is a characteristic of a grounded-grid amplifier?
Which describes a Pi-L-network used for matching a vacuum tube final amplifier to a 50-ohm unbalanced output?
Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?
What is one way a single-sideband phone signal can be generated?
What sets the minimum detectable signal level for a direct-sampling SDR receiver in the absence of atmospheric or thermal noise?
What is ringing in a filter?
How can an oscillator's microphonic responses be reduced?
Which of the following is a type of analog-to-digital conversion?
What is digital time division multiplexing?
How may data rate be increased without increasing bandwidth?
What is the primary effect of extremely short rise or fall time on a CW signal?
What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?
How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from a theoretical isotropic antenna, assuming each is driven by the same amount of power?
What is the approximate feed point impedance at the center of a two-wire folded dipole antenna?
Which of the following conductors would be best for minimizing losses in a station's RF ground system?
What is the primary purpose of phasing lines when used with an antenna having multiple driven elements?
Why is the physical length of a coaxial cable transmission line shorter than its electrical length?
On the Smith chart shown in Figure E9-3, what is the only straight line shown?
What is the main drawback of a small wire-loop antenna for direction finding?