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Assignment Questions - 14182_257
Assignment Questions - 14182_259

Neets Module 10-Introduction to Wave Propagation, Transmission Lines, and Antennas
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14 2-58.   When ducting is present in the atmosphere, multihop refraction of line-of-sight transmission can occur because of which of the following factors? 1.   Operating frequency of the transmitter 2.   Height of the transmitting antenna 3.   Angle of incidence of the radio wave 4.   Each of the above 2-59.   A propagation technique used to extend uhf transmission range beyond the horizon uses which of the following propagation characteristics? 1.   Ground reflection 2.   Ionospheric scatter 3.   Tropospheric scatter 4.   Atmospheric refraction 2-60.   Communications by tropospheric scatter can be affected by which of the following conditions? 1.   Sunspot activity 2.   Atmospheric conditions 3.   Ionospheric disturbances 4.   All of the above 2-61.   What effect, if any, does the radiation angle of a transmitting antenna have on the reception of communications by tropospheric scatter? 1.   The lower the angle, the weaker the signal 2.   The lower the angle, the stronger the signal 3.   The lower the angle, the more susceptible the signal is to distortion 4.   None 2-62.   Which of the following descriptions of tropospheric scatter signal reception is NOT true? 1.   Receiver signal strength decreases as the turbulence height is increased 2.   The level of reception depends on the number of turbulences causing scatter 3.   The energy received is the portion of the wave reradiated by the turbulence 4.   Increased communications distance enables more turbulence to act on the signal, thereby raising the received signal level 2-63.   The tropospheric scatter signal is often characterized by very rapid fading caused by which of the following factors? 1.   Extreme path lengths 2.   Multipath propagation 3.   Turbulence in the atmosphere 4.   Angle of the transmitted beam 2-64.   For which of the following communications situations would turbulence in the troposphere scatter transmission? 1.     10 MHz, range 200 miles 2.     30 MHz, range 800 miles 3.     50 MHz, range 600 miles 4.   100 MHz, range 400 miles






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