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a list three types of analog pulse modulationb which pulse modulation scheme is used as an intermediate step in the
it is necessary to transmit the human voice using a frequency range from 300 hz to 35 khz using a digital systema what
the compact disc system of digital audio uses two channels with tdm each channel is sampled at 441 khz and coded using
draw a constellation pattern for a modem that uses eight equallyspaced phase angles and four equally-spaced amplitude
a microwave radio system uses 256-qam that is there are 256 possible amplitude and phase combinationsa how many bits
a typical hf radioteletype system uses 170 hz shift between mark and space frequencies and a bit rate of 45 bits per
consider a qpsk system that will transmit three bits of information per symbola how many phase angles are neededb draw
a constellation diagram for a modem is shown in figure 412a what type of modulation is thisb if the transmitted bit
suppose the tv channel described in the previous problem is used for digital audio communication assume the rf system
suppose that a voice signal normally occupies 30 khz of bandwidth and has a signal-to-noise ratio of 20 db
the north american analog cellular radio system uses fm with channels 30 khz wide suppose such a channel were used for
ten voice signals are to be multiplexed and transmitted the analog signal occupies 4 khz of bandwidth and can be
what is the proportion of overhead in a basic rate isdn signal assume the d channel is part of the overhead compare
the local loop has a resistance of 650 ohms and the telephone instrument has a ringer voltage of 80 volts when the
suppose the voltage across a telephone line at the subscriber drops from 48 v to 10 v when the phone goes off hook if
a transmitter delivers 50 w into a 600- lossless line terminated with an antenna that has an impedance of 275
a 75- source is connected to a 50- load a spectrum analyzer with a length of 75- line the source produces 10 mw all
an open-circuited line is 075 wavelengths longa sketch the incident reflected and resultant voltage waveforms at the
a generator is connected to a short-circuited line 125 wavelengths longa sketch the waveforms for the incident
repeat problem 1 for waves on a coaxial cable with a solid polyethylene dielectricproblem 1find the wavelength for
calculate the characteristic impedance of a coaxial line with a polyethylene dielectric if the diameter of the inner
a transmitter with an output power of 50 w is connected to a matched load by means of 32 m of matched coaxial cable it
for a 10-ghz signal in rg-52u waveguide described in problem 17 calculatea the phase velocityb the group velocityc the
a signal with a power of 10 mw enters port 1 of a directional coupler the output power is 7 mw at port 2 and 100 microw
a draw a sketch showing how a hybrid tee could be used to connect a transmitter and a receiver to the same antenna in