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Related Flashcards
Cards In This Set
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What word describes the bending of an RF signal as it passes between mediums of different density?
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Refraction
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What causes an excessively high Voltage Standing Wave Ratio (VSWR) in an 802.11 WLAN?
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An impedance mismatch between devices in series with the main RF signal
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What factors affect the distance that an RF signal can be effectively received?
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1. Transmitting station's antenna type
2.Receiving station's radio sensitivity
3.Fresnel zone blockage
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As an RF wave propagates through space, the wave front experiences natural expansion. What is the detrimental effect of this expansion in a WLAN system?
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Signal Attenuation
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Given: ABC Company's network administrator was just asked to install a 5 GHz OFDM bridge linkbetween two buildings. He connected a WLAN bridge with a 50-ohm output to a 50-ohm RF coaxial cable. He connected the other end of the RF coaxial cable to a 25-ohm, 6 dBi Yagi antenna. What is the maximum VSWR between the WLAN bridge and the Yagi antenna?
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2.0:1
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Given: Return Loss is the decrease of forward energy in a system because some of the power is being reflected back toward the transmitter.
What can cause a high return loss in an RF transmission system?
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An impedance mismatch between devices in the RF system
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What factor is NOT taken into account when calculating the System Operating Margin of a point-to-point outdoor WLAN bridge link?
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Antenna height
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Given: A WLAN transmitter that emits a 200 mW signal is connected to a cable with a 9 dB loss, If the cable is connected to an antenna with a 10 dBi gain, what is the EIRP at the antenna element?
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250 mW
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In a long-distance RF link, what statement about Fade Margin is true?
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Fade Margin is an amount of signal strength in addition to the Link Budget.
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