Description : Which cavity of a three-cavity klystron causes most of the velocity modulation?
Last Answer : The middle cavity.
Description : What can be added to the basic two-cavity klystron to increase the amount of velocity modulation and the power output?
Last Answer : Intermediate cavities between the input and output cavities.
Description : What types of modulation are shipboard receive-only equipment designed to receive?
Last Answer : Fm or psk.
Description : What type of modulation do most analog fiber optic communications systems use?
Last Answer : Intensity modulation.
Description : Define modulation.
Last Answer : The process of varying one or more characteristics of an optical signal to encode and convey information.
Description : Which junction of the transistor in the common-emitter detector detects the modulation envelope?
Last Answer : Emitter-base junction
Description : Phase-shift keying is similar to what other two types of modulation?
Last Answer : Cw and frequency-shift keying.
Description : What type of modulation depends on the carrier-wave phase shift?
Last Answer : Phase.
Description : How is the degree of modulation expressed in an fm system?
Last Answer : As the ratio of the frequency deviation to the maximum frequency deviation allowable.
Description : What characteristic of a carrier wave is varied in frequency modulation?
Last Answer : Instantaneous frequency.
Description : Name the modulation system in which the frequency alternates between two discrete values in response to the opening and closing of a key?
Last Answer : . Frequency-shift keying.
Description : What are the two types of angle modulation?
Last Answer : Frequency and phase.
Description : What is the primary advantage of pulse-modulation systems?
Last Answer : . Low susceptibility to noise.
Description : Pulse-code modulation requires the use of approximations of value that are obtained by what process?
Last Answer : Quantization.
Description : What is pulse-frequency modulation?
Last Answer : A method of pulse modulation in which a modulating wave is used to frequency modulate a pulse-generating circuit
Description : What is the main disadvantage of pulse-position modulation?
Last Answer : It requires synchronization between the transmitter and receiver.
Description : Which edges of the pulse can be modulated in pulse duration modulation?
Last Answer : Either, or both at the same time.
Description : What characteristics of a pulse can be changed in pulse time modulation?
Last Answer : The time duration of the pulses or the time of occurrence of the pulses.
Description : What, if any, noise susceptibility advantage exists for pulse-amplitude modulation over analog amplitude modulation?
Last Answer : Both are susceptible to noise and interference
Description : To ensure the accuracy of a transmission, what is the minimum number of times a modulating wave should be sampled in pulse modulation?
Last Answer : 2.5 times the highest modulating frequency.
Description : What action is necessary to impress intelligence on the pulse train in pulse modulation?
Last Answer : Some characteristic of the pulses has to be varied.
Description : With a single modulating tone, what is the amplitude of the sideband frequencies at 100-percent modulation?
Last Answer : One-half the amplitude of the carrier.
Description : What is percent of modulation?
Last Answer : The depth or degree of modulation.
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 : What is high-level modulation?
Last Answer : Modulation produced in the plate circuit of the last radio stage of the system.
Description : What is amplitude modulation?
Last Answer : Any method of modulating an electromagnetic carrier frequency by varying its amplitude in accordance with the intelligence.