For RF line of sight or LOS communication, ____ of the first Fresnel zone must be clear of obstacles. 50% 60% 70% 80%

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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  1. For RF line of sight or LOS communication, ____ of the first Fresnel zone must be clear of obstacles.
  2. 50%
  3. 60%
  4. 70%
  5. 80%

 

  1. What is the maximum line-of-sight distance (D) between a paging antenna 800 ft high and a pager receiver antenna 40.5 ft off the ground?
  2. 35 mile
  3. 49 mile
  4. 40 mile
  5. 38 mile

 

  1. IEEE 802.11 ___ devices can only use MIMO antennas.
  2. a
  3. b
  4. g
  5. n

 

  1. In Yagi antenna, reflector is ____ greater than λ/2.
  2. 10%
  3. 7%
  4. 12%
  5. 5%

 

  1. What is the frequency range of Sky waves?
  2. 3 KHz to 2 MHz
  3. 2 MHz to 30 MHz
  4. 30 MHz to 300 GHz
  5. 3 GHz to 30 GHz

 

  1. What is the impedance of Folded Dipole antenna?
  2. 377Ω
  3. 73Ω
  4. 5Ω
  5. 300Ω

 

  1. Standing wave is the composition of __________ voltage.
  2. Incident & load
  3. Reflected & load
  4. Incident & Reflected
  5. None of the above

 

  1. ______________ is obtained by dividing the speed of light (or radio) wave in a vacuum, and the speed of light (or radio) wave in the medium that causes the wave to be bent.
  2. Diffraction Index
  3. Reflection Index
  4. Refraction Index
  5. Deflection Index

 

  1. A MIMO technique of sending the same transmission out from different antennas that will take different paths is called:
  2. Transmit beamforming
  3. Maximal ratio combining
  4. Spatial diversity
  5. Spatial multiplexing

 

  1. AM broadcast signals are propagated primarily by ground waves during the day and its antenna must maintain ______________ polarization.
  2. Horizontal
  3. Elliptical
  4. Conical
  5. Vertical
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