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two points 50 km apart on earth can communicate using direct radio link with a leo satellite of 500 km or a
a helical antenna consists of 10 turns with a spacing of 10 cm and a diameter of 127 cma calculate the frequency at
calculate the gain with respect to an isotropic antenna of a half-wave dipole with an efficiency of 90 that is placed
a yagi antenna has a gain of 10 dbi and a front-to-back ratio of 15 db it is located 15 km from a transmitter with an
a frequency synthesizer of the type shown in figure 92 has a crystal oscillator operating at 5 mhz q 100 and n ranges
a transmitter has an output carrier power of 25 w if spurious signals must be at a level of -70 dbc or less what is the
a transmitter is rated to supply 4 w of power to a 50- load while operating from a power supply that provides 138 v the
a superheterodyne receiver is tuned to a frequency of 5 mhz when the local-oscillator frequency is 665 mhza what is the
one receiver has a sensitivity of 1 microv and another a sensitivity of 10 dbf under the same measurement conditions
a receiver has a sensitivity of 03 microv and the same receiver can handle a signal level of 75 mv without overloading
the receiver of problem 11 has a blocking dynamic range of 80 db if the desired signal has a level of 10 microv what is
a receiver uses low-side injection for the local oscillator and an if of 1750 khz if the local oscillator is operating
an fm broadcast receiver with high-side injection and an if of 107 mhz is tuned to a station at 915 mhza what is the
why is it more efficient to use a single provider for cellular and pcs phone service why are multiple providers used in
an fm receiver is double conversion with a first if of 107 mhz and a second if of 455 khz high-side injection is used
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