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9 Cards in this Set

  • Front
  • Back
What advantages did early radio communications offer?
Transatlantic communications became faster, had greater capacity, and were somewhat less expensive than cable systems.
When were satellite communications consiered to be a viable communications media?
During the initial stages of the space program, which led to the development of satellite communications systems.
Within what frequency band are you transmitting if your ouptut frequency is 22 MHz? 22 GHz?
High radio frequency(HF); super-high radio frequencies(SHF)
What are the two primary types of radio waves?
Ground waves and sky waves
Which type of radio wave is a direct wave considered to be?
A Ground wave
What space wave component travels in an almost straight line from the transmitting to receiving antenna?
Direct wave
What is the difference between a refracted and reflected wave?
A refracted wave is bent as it passes obliquely from one medium to another as a result of the difference in the velocity of the wave from the first medium to the second. A reflected wave is relected from the surface of the earth.
Name the three regions of the atmosphere that affect RF waves.
Troposphere, stratosphere, and ionosphere
Name the layers of the ionosphere and state which layer is the least ionized and which is the most.
D, E and F layers. The least ionized layer is the lower or D layer, while the most ionized is the upper or F layer.