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a draw the block diagram for an fm broadcast receiver it is to have one rf stage and an if frequency of 107 mhz the
suppose a receiver has the following gain structure all stages operating at maximum gaina what is the total power gain
the block diagram of figure 923 shows a double conversion receiver it has two mixers two local oscillators and two
a receivers if filter has a shape factor of 25 and a bandwidth at the 6 db down points of 6 khz what is its bandwidth
what advantage does a typical mobile antenna have over a typical portable cell phone antenna given this advantage why
why is it unnecessary for cell phones and cellular base station transmitters to use linear rf power amplifiers in their
how does the amps system attempt to prevent fraudulent billing of calls to the wrong customer how effective are these
repeat the calculation for problem 1 assuming typical mobile propagation conditions and a frequency of 800 mhz what can
now suppose we have a cellular system the mobile is as described in problem 2 but the base station has an antenna with
amateur radio clubs often operate repeaters usually in frequency bands near 144 and 430 mhz they do not have the same
suppose that in an attempt to increase range cordless telephone manufacturers double the power output of their
the systems described in this chapter are sometimes called secondgeneration pcs what was the first generation what is
suppose that the same type of vocoder used in full-rate tdma cellular radio were to be used for wireline telephony how
a assume that the range of a mobile phone is limited by its transmitter power if a portable phone class iii can
a cellular system is designed to operate reliably with traffic of 2000 e if each customer on average uses the phone for
a calculate the length of a quarter-wave vertical antenna for each of the following services cb radio at 27 mhz
compare the spectral efficiency of the tdma and gsm pcs and analog amps in terms of khz used per voice channel proceed
a calculate the length of a quarter-wave monopole antenna for the center of the cellular radio band 860 mhz and the
a calculate the time for one complete repetition of the walsh code on the forward channelb repeat a for the long code
as we saw earlier in this book ordinary digital wireline telephony uses a bit rate of 64 kbs for each voice channel
a suppose that the smsch in a tdma system occupies five slots in each superframe what is the total bit rate available
what velocity would a satellite need to have to orbit just above the surface of the earth why would such an orbit be
a receiving installation has a gt of 30 db if its antenna gain is 50 dbi and the antenna noise temperature is 25 k what
find the noise temperature of an antenna on a satellite if it looks at the earth giving it a sky noise temperature of
a calculate the path loss for a satellite in the iridium system on the link from satellite to mobile assuming that the