Description : The service are in standard AM broadcast is described as ______ if there is no fading of signal.
Last Answer : Primary
Description : What do you call the service area of a standard AM broadcast where fading is allowed but not objectionable co-channel interference? A. Experimental B. Secondary C. Tertiary D. Primary
Last Answer : B. Secondary
Description : The channel spacing in the Philippine FM broadcast standards
Last Answer : 800 kHz
Description : The channel spacing in the Philippine FM broadcast standards.
Description : The term single mode and multimode are best described as:
Last Answer : the number of wavelengths each fiber can support
Description : EMD is best described by which statement?
Last Answer : . 70 percent of the core diameter and 70% of the fiber NA should be filled with light.
Description : The term responsivity as it applies to a light detector is best described as.
Last Answer : the ratio of the diode output current to the input optical power
Description : The modulated picture carrier wave includes the composite video signal as the:
Last Answer : Symmetric envelope of amplitude variations
Description : A 4.5-MHz signal which is equal to the difference between the picture and sound RF carrier frequencies in a 6-MHz TV channel.
Last Answer : Intercarrier frequencY
Description : The total bandwidth of an NTSC TV signal is:
Last Answer : . 6 MHz
Description : The most critical and difficult part of receiving a direct – sequence spread spectrum signal is :
Last Answer : Synchronism
Last Answer : 6 MHz
Description : To a conventional narrowband receiver, a spread spectrum signal appears to be
Last Answer : Noise
Description : The minimum optical power a light detector can receive and still produce a usable electrical output signal.
Last Answer : light sensitivity
Description : The phase relationship between signaling elements for BPSK is the optimum signaling format and occurs only when two binary signal levels are allowed and when one signal is the exact negative of the other
Last Answer : Antipodal signaling
Description : A pulse modulation technique as the width of a constant amplitude pulse is varied proportional to the amplitude of the analog signal at the time the signal is sampled.
Last Answer : PWM, PLM, PDM
Description : The slope of the analog signal is greater than the delta modulator can maintain
Last Answer : Slope overload
Description : Rate of change of a signal on a transmission medium after encoding and modulation have occurred
Last Answer : baud rate
Description : Used for transmission of PCM encoded time – division multiplexed digital signal.
Last Answer : T carriers
Description : The signal from a satellite is normally aimed at a specific area called the ________
Last Answer : footprint
Description : ______ are special-interest groups that quickly test, evaluate, and standardize new technologies
Last Answer : Forums
Description : A class A FM station is limited in antenna height of ______ feet above average terrain.
Last Answer : 2000
Description : The vertical field-scanning frequency is ______ Hz
Last Answer : 60
Description : The final power amplifier in an FM transmitter usually operates class ______.
Last Answer : C
Description : The time it takes to transmit one TDM frame is called ______
Last Answer : Frame time
Description : In a ______ handoff, a mobile station can communicate with two base stations at the same time
Last Answer : . soft
Description : In a ______ handoff, a mobile station only communicates with one base station
Last Answer : hard
Description : One of the responsibilities of the transport layer protocol is to create a ______ communication.
Last Answer : process to process
Description : It involves converting standard logic levels to a form more suitable to telephone transmission lines
Last Answer : igital line encoding
Description : n digital modulation, it is similar to standard amplitude modulation except there is only two amplitudes possible.
Last Answer : amplitude shift keying
Description : _______ is a standard developed by ANSI for fiber-optic networks.
Last Answer : SONET
Description : Germanium diodes are used in AM detectors because ___
Last Answer : they minimize distortion from nonlinearit
Description : In an AM transmitter with 100% modulation, the voltage of the final RF stage will be
Last Answer : approximately four times the DC supply voltage
Description : If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be
Last Answer : 50
Description : At what frequency compared to the cutoff frequency of a waveguide will the wavefronts be reflected back and forth across the guide (setting up standing waves) and no energy
Last Answer : UHF receiving antenna
Description : A mode where the entire magnetic field is in the transverse plane and has no portion parallel to the length axis.
Last Answer : TM mode
Description : It is logically equivalent to making telephone call through the DDD network except no direct end-to-end connection is made
Last Answer : Virtual call
Description : In a TV receiver the raster is normal but there is no sound and quality of picture is poor. The defective part is
Last Answer : AGC, video IF amplifier, RF amplifier
Description : does its best to get a transmission through to its destination, but with no guarantees
Last Answer : best-effort delivery
Last Answer : Which type of fading causes serious distortion of modulated signal: Selective fading.
Description : What is the type of emission use by standard AM radio broadcast? A. A0 B. F3 C. A3 D. A5C
Last Answer : C. A3
Description : Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF
Last Answer : C. MF
Description : The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization ___
Last Answer : is horizontal
Description : It is the ratio of the power density radiated in a particular direction to the power density radiated to the same point by a reference antenna, assuming both antennas are radiating the same amount of power
Last Answer : directive gain
Description : The property of interchangeability for the transmitting and receiving operations is known as ____
Last Answer : reciprocity
Description : The fields surrounding the antenna do not collapse their energy back into the antenna but rather radiate it out in space
Last Answer : radiation field
Description : It is the ratio of the radiated to the reflected energy:
Last Answer : Radiation efficiency
Description : It is the resistance that, if it replaced the antenna, would dissipate exactly the same amount of power that the antenna radiates
Last Answer : . Radiation resistance
Description : Plots of field strength or power density with respect to the value at a reference point.
Last Answer : relative radiation pattern
Description : The radiation pattern plotted in terms of electric field strength or power density
Last Answer : absolute radiation pattern