Flashcards
CWNA - Flash Cards - Chapter 2
Flashcards do conjunto (19)
- 1The distance between the two successive crescents (peaks) or two successive throughs (valleys)A wavelength
- 2how often an RF signal cycles in a certain time periodFrequency
- 3Frequency of 1,000,000,000 (billion) cycles per second1Ghz
- 4The height of the waveAmplitude
- 5Most common RF behaviourAbsorption
- 6Wave hits smooth object that is larger than the wave itself, dependant on the material the signal may bounce in another directionReflection
- 7Multiple reflectionsScattering
- 8Signal passes through a medium with different density causing the wave to change direction.Refraction
- 9Causes of refraction- Water Vapour
- Changes in air temperature
- Changes in air pressure - 10Signal is bent around an objectDiffraction
- 11Decrease in amplitudeLoss (Attenuation)
- 12Loss of signal strength caused by the natural broadening of the wavesFree Space Path Loss (FSPL)
- 13Occurs when 2 or more signals arrive at the receiving station at the same time or within nanoseconds of each otherMultipath
- 14Multiple RF signal paths arrive at the same time and are in phase (phase differences of 0 to 120 degrees) will result in increased signal strengthUpfade
- 15Multiple RF signals arrive at the same time but are out of phase (phase difference of 121 to 179 degrees) Results in decrease signal strengthDownfade
- 16Multiple RF signals arrive at the same time and are 180 degrees out of phase of each otherNulling
- 17Multiple signals arriving but not at the same time the receiver might have trouble demodulating the signal.Data Corruption
- 18Increase to signal on the transmitter or transceivers side through the use of an amplifier.Active Gain
- 19Focusing the antenna, the inner workings of the antenna make the signal stronger.Passive Gain
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- CWNA FlashCards sobre CWNA - Flash Cards - Chapter 2, criado por Amit Pindoria em 21-02-2017.
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- Amit Pindoria
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