Nt1310 Chapter 7
CHAPTER 7 1. The ability of a receiver to choose a desired signal frequency while rejecting closely adjacent signal frequencies is known as selectivity. 2. Decreasing the Q of a resonant circuit causes its bandwidth to increase. 3. Good selectivity usually means narrow bandwidth. 4. True. A tuned circuit can provide voltage gain. 5. Cascading tuned circuits cause the selectivity to increase. 6. If the selectivity of a tuned circuit is too sharp, the sidebands of the received signal may be attenuated. 7. A tuned circuit has a Q of 100 at its resonant frequency of 500 kHz. Its bandwidth is 5 kHz. 8. A parallel LC tuned circuit has a coil of 3µHz and a capacitance of 75 pF. The coil resistance is 10 Ω. The circuit bandwidth
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A T-1 multiplexer has 24 channels and a total bit rate of 1.544 MHz.
CHAPTER 11 1. A satellite is kept in orbit by a balance between two forces: Centripetal force, gravitational pull 2. A satellite that revolves in the same direction as the earth rotates is said to be in a posigrade. 3. The geometric shape of a noncircular orbit is a ellipse. 4. The center of gravity of the earth is called the geocenter. 5. The time for one orbit is called the period. 6. The angle of inclination of a satellite is 0 degrees if it orbits over the equator and is 90 degrees if it orbits over the north and south poles. 7. To prevent excessive signal attenuation and noise in the atmosphere, satellite angles of elevation of less than 5 degrees should be avoided. 8. A satellite that rotates around the equator 22, 300 mi from the earth is said to be in geosynchronous or geostationary orbit. 9. Small jet thrusters on a satellite are fired to correct the satellite’s attitude. 10. Name two ways satellites are stabilized in space. a. spin b. three-axis stabilization 11. The three axes of a satellite are yaw, pitch, and roll. 12. The point on the earth directly below a satellite is called the subsatellite
A T-1 multiplexer has 24 channels and a total bit rate of 1.544 MHz.
CHAPTER 11 1. A satellite is kept in orbit by a balance between two forces: Centripetal force, gravitational pull 2. A satellite that revolves in the same direction as the earth rotates is said to be in a posigrade. 3. The geometric shape of a noncircular orbit is a ellipse. 4. The center of gravity of the earth is called the geocenter. 5. The time for one orbit is called the period. 6. The angle of inclination of a satellite is 0 degrees if it orbits over the equator and is 90 degrees if it orbits over the north and south poles. 7. To prevent excessive signal attenuation and noise in the atmosphere, satellite angles of elevation of less than 5 degrees should be avoided. 8. A satellite that rotates around the equator 22, 300 mi from the earth is said to be in geosynchronous or geostationary orbit. 9. Small jet thrusters on a satellite are fired to correct the satellite’s attitude. 10. Name two ways satellites are stabilized in space. a. spin b. three-axis stabilization 11. The three axes of a satellite are yaw, pitch, and roll. 12. The point on the earth directly below a satellite is called the subsatellite