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a transmission line of unknown impedance is terminated with two different resistances and the swr is measured each time
state the difference between power and power density explain why power density decreases with the square of the
a pcs signal at 19 ghz arrives at an antenna via two paths differing in length by19 ma calculate the difference in
a satellite transmitter operates at 4 ghz with an antenna gain of 40 dbi the receiver 40000 km away has an antenna gain
a transmitter has an output power of 50 w it is connected to its antenna by a feedline that is 25 meters long and
a certain antenna has a gain of 7 db with respect to an isotropic radiatora what is its effective area if it operates
an isotropic source radiates 100 w of power in free space at a distance of 15 km from the source calculate the power
what is meant by a collinear antenna sketch such an antenna and its radiation pattern and classify it as broadside or
sketch the radiation patterns of an isotropic antenna and of a half-wave dipole in free space and explain why a dipole
a map indicates that a certain spot on the earth is in the 40 dbw contour of a satellite beam that is the eirp from the
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