Description : What basic circuits meet the requirements of an externally synchronized master oscillator?
Last Answer : Sine-wave oscillator, single-swing blocking oscillator, and master trigger (astable) multivibrator.
Description : What type of multivibrator has two stable states?
Last Answer : Bistable.
Description : What type of multivibrator does not have a stable state?
Last Answer : Astable.
Description : In a bistable multivibrator, how many trigger pulses are needed to produce one complete cycle in the output?
Last Answer : Two.
Description : What is another name for the monostable multivibrator?
Last Answer : One-shot.
Description : In an astable multivibrator, which components determine the pulse repetition frequency?
Last Answer : RC coupling networks.
Description : What is needed to use a monostable or one-shot multivibrator for a clock circuit?
Last Answer : Triggers.
Description : What circuit section is required in the output of a multivibrator modulator to eliminate unwanted output frequencies?
Last Answer : An LCR filter.
Description : Referred to an oscillator signal “leak through” from a properly neutralized amplifier such as a master oscillator power amplifier. A. Carrier B. Stray signal C. Back wave D. Loss wave
Last Answer : C. Back wave
Description : In a heterodyne-type frequency meter, what is the difference between the oscillator frequency and the unknown frequency?
Last Answer : Beat frequency.
Description : What component in a blocking oscillator controls pulse width?
Last Answer : Transformer.
Description : What signal is used to synchronize the coherent oscillator to a fixed phase relationship with the transmitted pulse?
Last Answer : Coho lock pulse.
Description : What is the primary advantage of power-amplifier transmitters over keyed-oscillator transmitters?
Last Answer : Frequency stability.
Description : Name a disadvantage of sine-wave oscillator synchronizers.
Last Answer : It requires additional shaping circuits.
Last Answer : . It requires additional shaping circuits.
Description : What transmission method uses a stable cw reference oscillator, which is locked in phase with the transmitter frequency?
Last Answer : Pulse-Doppler.
Description : When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?
Last Answer : High-voltage pulse from the modulator.
Description : What is the polarity of the first alternation of the tank circuit in an emitter-loaded npn pulsed oscillator?
Last Answer : Negative
Description : Why is a high-gain transistor used in the phase-shift oscillator?
Last Answer : Because of the losses encountered in the RC networks.
Description : Which components provide the regenerative feedback signal in the phase-shift oscillator?
Last Answer : Resistor-capacitor networks.
Description : What is the identifying feature of a Colpitts oscillator?
Last Answer : Split capacitors.
Description : What is the difference between the series-fed and the shunt-fed Hartley oscillator?
Last Answer : In the series-fed Hartley oscillator, dc flows through the tank circuit.
Description : What is the main difference between the Armstrong oscillator and the Hartley oscillator?
Last Answer : Feedback coil. Armstrong uses a separate coil. Hartley uses a tapped coil.
Description : Which oscillator uses tapped capacitors for feedback?
Last Answer : Colpitts.
Description : Which oscillator uses a tapped inductor for feedback?
Last Answer : Hartley.
Description : Which oscillator uses a tickler coil for feedback?
Last Answer : Armstrong.
Description : What characteristic of a gunn oscillator is inversely proportional to the transit time of the domain across the semiconductor?
Last Answer : The frequency.
Description : Why is the tunnel diode loosely coupled to the cavity in a tunnel-diode oscillator?
Last Answer : To increase the stability.
Description : What determines the frequency of a tunnel-diode oscillator?
Last Answer : The tuned circuit or cavity frequency.
Description : In an fm transmitter, when does an oscillator generate only a steady frequency?
Last Answer : When no modulation is present.
Description : What is the function of the oscillator in a cw transmitter?
Last Answer : It generates an rf carrier at a given frequency within required limits.
Description : Name two methods of oscillator keying.
Last Answer : Plate keying and cathode keying.
Description : What type of receiver is most often used in radar systems?
Last Answer : Superheterodyne.
Description : What type of modulator is most commonly used in modern radar systems?
Last Answer : Line-pulsed.
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 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.