Description : What type of modulator is most commonly used in modern radar systems?
Last Answer : Line-pulsed.
Description : What type of receiver is most often used in radar systems?
Last Answer : Superheterodyne.
Description : What type of tube best meets the requirements of a modulator switching element?
Last Answer : Thyratron.
Description : What type of modulator is the cathode modulator (low- or high-level)?
Last Answer : Low-level.
Description : The collector-injection modulator is similar to what type of tube modulator?
Last Answer : Plate modulator.
Description : In computing, how is a modulator-demodulator more commonly known?
Last Answer : Modem
Description : What is the purpose of a modulator in a servo system?
Last Answer : To convert a dc error signal into an ac error signal.
Description : What modulator element controls the rate at which the storage element charges?
Last Answer : The charging impedance.
Description : In addition to a flat top, what characteristics must a modulator pulse have?
Last Answer : Steep leading and trailing edges.
Description : What components may be used to build a basic phase modulator?
Last Answer : A phase-shift network such as a variable resistor and capacitor in series
Description : What characteristic of a varactor is used in an fm modulator?
Last Answer : Capacitance.
Description : What circuit section is required in the output of a multivibrator modulator to eliminate unwanted output frequencies?
Last Answer : An LCR filter.
Description : What characteristic of a transistor is varied in a semiconductor-reactance modulator?
Last Answer : Collector-to-emitter capacitance.
Description : How does the reactance-tube modulator impress intelligence onto an rf carrier?
Last Answer : By changing the reactance of an oscillator circuit in consonance with the modulating voltage.
Description : What are the basic components of a thyratron modulator?
Last Answer : ower source, a circuit for storing energy, a circuit for discharging the storage circuit, and a pulse transformer.
Description : What is the primary component for a spark-gap modulator?
Last Answer : Either a fixed spark gap that uses a trigger pulse to ionize the air between the contacts, or a rotary gap that is similar to a mechanical switch.
Description : What causes the change in collector current in an emitter injection modulator?
Last Answer : Gain is varied by changing the voltage on the emitter.
Description : When is a control-grid modulator used?
Last Answer : In cases when the use of a minimum of af modulator power is desired.
Description : How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?
Last Answer : Between 0 and nearly two times its unmodulated value.
Description : The modulator is required to be what kind of a circuit stage in a plate modulator?
Last Answer : Power amplifier
Description : For what class of operation is the final rf power amplifier of a plate-modulator circuit biased?
Last Answer : Class C
Description : The term modem is a composite word that refers to the two functional entities that make up the device: asignal _______ and a signal _______. A) modulator; demodulator B) demodulator; modulator C) modern;demo D) none of the above
Last Answer : modulator; demodulator
Description : The name “modem” is derived from (1) modern demarkator (2) modulator demand (3) modern demodulator (4) modulator demodulator
Last Answer : modulator demodulator
Description : What are the three most commonly used tape reeling systems?
Last Answer : a. Take-up control. b. Two-motor reeling. c. Tape buffering.
Description : What type of multivibrator can be used as a radar master oscillator?
Last Answer : Free-running.
Description : What type of ranging circuit is most often used with a radar that requires extremely accurate range data?
Last Answer : Range gate or range step.
Description : Fire-control tracking radar most often radiates what type of beam?
Last Answer : A narrow circular beam.
Description : Radar altimeters use what type of transmission signal?
Last Answer : Frequency modulated (fm).
Description : What type of radar provides continuous range, bearing, and elevation data on an object?
Last Answer : Track radar.
Description : What type of radar detects range, bearing, and height?
Last Answer : Three-dimensional.
Description : What type of radar transmitter power is measured over a period of time?
Last Answer : Average power.
Description : What is the most commonly used intermediate frequency of radar receivers? A. 40 MHz B. 60 MHz C. 70 MHz D. 30 MHz
Last Answer : D. 30 MHz
Description : . What is the normal source of dry air for a radar system?
Last Answer : Ship's central dry-air system
Description : The peak power of a radar depends on the interrelationship of what other factors?
Last Answer : Average power, pulse width, and prt.
Description : The ideal radar spectrum has what relationship to the carrier frequency?
Last Answer : Symmetrical above and below the carrier frequency.
Description : The spectrum of a radar transmitter describes what characteristic of the output pulse?
Last Answer : Frequency distribution
Description : Which of the two types of automatic gain control, agc or iagc, is most effective in radar use for the Navy?
Last Answer : IAGC.
Description : What IF frequencies are normally used in radar receivers
Last Answer : Thirty or sixty megahertz.
Description : In an externally synchronized radar, what determines the prr of the transmitter?
Last Answer : The master oscillator.
Description : A self-synchronized radar system obtains timing trigger pulses from what source?
Last Answer : Transmitter.
Description : What is the purpose of the majority of circuits in a radar system?
Last Answer : Timing and control.
Description : What is the purpose of the synchronizer in a radar system?
Last Answer : Controls system operation and timing.
Description : Which of the two general classes of antennas is most often used with radar?
Last Answer : Directional.
Description : What radar scope uses a range step for range measurement?
Last Answer : The A scope.
Description : Range-marker generators produce pulses based on what radar constant?
Last Answer : The radar mile (12.36 microseconds).
Description : What are the required radar inputs for proper indicator operation?
Last Answer : Triggers, video, and antenna information.