Description : Which of the following parts of the radio receiver represent the component that extracts the desire RF signal from the electromagnetic wave? A. AF amplifier B. Antenna C. Detector D. Crystal
Last Answer : B. Antenna
Description : What tube in a duplexer has the primary function of disconnecting the receiver?
Last Answer : Tr tube.
Description : What function does a receiver transfer switchboard perform?
Last Answer : Transfers receiver audio outputs to remote control stations.
Description : What consists the front-end circuit of a VHF TV superheterodyne receiver? A. Mixer, RF amplifier and AFC? B. RF amplifier, Band pass filter and mixer C. Local oscillator, mixer and RF amplifier D. Local oscillator, AGC and antenna
Last Answer : C. Local oscillator, mixer and RF amplifier
Description : ______ is the first component of any MATV system to received broadcast signals. A. Receiver B. Antenna C. Filter D. Transmitter
Description : What is the name given to a doped germanium crystal with an excess of free holes?
Last Answer : P-type crystal.
Description : What is the impedance of a crystal at its resonant frequency when it is used in the series mode?
Last Answer : Minimum.
Description : What is the impedance of a crystal at its resonant frequency when it is used in the parallel mode?
Last Answer : Maximum
Description : During the manufacture of a point-contact diode, what is the purpose of passing a relatively large current from the catwhisker to the silicon crystal?
Last Answer : . To form a small region of p-type material
Description : What does the liquid crystal display require for computer applications?
Last Answer : An external light source, called a backlight.
Description : What property of a crystalline material is used in a crystal microphone?
Last Answer : The piezoelectric effect.
Description : What is the disadvantage of using a double receiver instead of two individual receivers?
Last Answer : If one of the receivers goes bad the entire unit must be replaced.
Description : When is a synchro receiver (TR) properly zeroed?
Last Answer : A TR is zeroed when electrical zero voltages exist across its stator windings at the same time its rotor is on zero or on its mechanical reference position.
Description : What is the most likely problem if the transmitter shaft reads 0º when the receiver shaft indicates 180º?
Last Answer : The rotor leads on either the transmitter or the receiver are reversed.
Description : What two receiver leads are reversed to reverse the rotor's direction of rotation?
Last Answer : 1 and S3.
Description : What is the relationship between the transmitter and receiver stator voltages when their rotors are in correspondence?
Last Answer : The voltages are equal and oppose each other.
Description : What is the physical difference between a synchro transmitter and a synchro receiver?
Last Answer : A synchro receiver uses some form of damping to retard excessive oscillations or spinning.
Description : Receiver bandwidth is defined as those frequencies spread between what two points of the receiver response curve?
Last Answer : Half-power points.
Description : When measuring receiver sensitivity, what quantities must you add to the dBm reading obtained on the signal generator or test set?
Last Answer : Attenuations of the directional coupler and the connecting cable.
Description : You determine receiver sensitivity by measuring the power level of what signal?
Last Answer : Minimum discernible signal (mds).
Description : A loss of receiver sensitivity has the same effect on range performance as what other loss?
Last Answer : Transmitter power loss.
Description : Where should the transmitter spectrum be located with respect to the receiver response curve?
Last Answer : In the center.
Description : A monopulse receiver has how many separate channels?
Last Answer : Three.
Description : How does ftc affect receiver gain, if at all?
Last Answer : FTC has no effect on receiver gain
Description : Immediately after the transmitter fires, stc reduces the receiver gain to what level?
Last Answer : Zero.
Description : Which receiver component converts the IF pulses to video pulses?
Last Answer : Detector.
Description : What receiver circuit actually produces the IF frequency?
Last Answer : Mixer.
Description : Which component of the receiver produces the signal that is mixed with the received signal to produce the IF signal?
Last Answer : Local oscillator.
Description : What type of receiver is most often used in radar systems?
Last Answer : Superheterodyne.
Description : what causes the initial and final pulses on the receiver output signal?
Last Answer : Leakage from the duplexer.
Description : What is the result of an impedance mismatch between a receiver or transmitter and its transmission line or antenna?
Last Answer : High vswr, which equates to poor reception or a loss of power output.
Description : Which amplifier stage (the preamplifier or the postamplifier) is a dominant contributor of noise and significantly influences the sensitivity of the receiver?
Last Answer : The preamplifier.
Description : Define receiver dynamic range.
Last Answer : The range of optical power levels over which the receiver operates within the specified values. It
Description : . Which part of the receiver amplifies the electrical signal to a level suitable for further signal processing?
Last Answer : Amplifier.
Description : What is a fiber optic receiver?
Last Answer : An electro-optic device that accepts optical signals from an optical fiber and converts them into electrical signals
Description : What is the main factor that determines receiver sensitivity?
Last Answer : Noise
Description : List the main types of receiver noise.
Last Answer : Thermal noise, dark current noise, and quantum noise
Description : List the key operational parameters used to define receiver performance.
Last Answer : Receiver sensitivity, bandwidth, and dynamic range.
Description : What does a tone control circuit in a receiver do to the audio signal?
Last Answer : It controls the amount of bass and treble response.
Description : What two components give a ssb receiver its advantages over an AM superheterodyne receiver?
Last Answer : A special type of detector and a carrier reinsertion oscillator
Description : What are the four basic receiver characteristics?
Last Answer : Sensitivity, noise, selectivity, and fidelity.
Description : What four basic functions must a receiver perform?
Last Answer : Reception, selection, detection, and reproduction.
Description : What is the purpose of agc/avc in a receiver?
Last Answer : To limit unwanted variations in the output.
Description : What type of tuning does the receiver use?
Last Answer : Digital
Description : What are the essential components of a cw receiver system?
Last Answer : An antenna, tank circuit for tuning, rectifier for detection, filter to give constant output, and an indicator device
Description : What type filter is used to block the passage of current for a narrow band of frequencies, while allowing current to flow at all frequencies above or below this band?
Last Answer : . Band-reject.
Description : What type filter is used to allow a narrow band of frequencies to pass through a circuit and attenuate all other frequencies above or below the desired band?
Last Answer : Bandpass.
Description : What term is used to describe the frequency at which the filter circuit changes from the point of rejecting the unwanted frequencies to the point of passing the desired frequencies?
Last Answer : Frequency cutoff (fco).
Description : What is the filter called that passes low frequencies but rejects or attenuates high frequencies?
Last Answer : Low-pass filter, high-frequency discriminator or high-frequency attenuator.
Description : What is the filter called in which the low frequencies do not produce a useful voltage?
Last Answer : High-pass filter, low-frequency discriminator, or low-frequency attenuator.