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Related Flashcards
Cards In This Set
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Doubling the distance between a transmitter and a receiver will decrease the received signal by 6 dB. Halving the distance between a transmitter and receiver will increase the received signal by 6 dB.
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6 dB rule
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When connected to the transmitter, it collects the AC signal that it receives from the transmitter and directs, or radiates, the RF waves away in a pattern specific to the ___ type. When connected to the eceiver, it takes the RF waves that it receives through the air and directs the AC signal to the receiver.
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Antenna
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The ratio of 10 to 1 between the power of two sounds.
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Bel
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Compares a signal to 1 milliwatt of power. Means decibels relative to 1 milliwatt. Because it is a measurement that is compared to a known value, 1 milliwatt, then it is actually a measure of power.
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DBm
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Derived from the term bel. It is a measurement of the ratio between two powers.
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Decibel (dB)
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The increase in gain of an antenna compared to the signal of a dipole antenna.
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Decibels dipole (dBd)
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The incease in gain of an antenna compared to what an isotropic radiator would generate.
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Decibels isotropic
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A process that client stations use to shift to lower-bandwidth capabilities as they move away from an access point and to higher-bandwidth capabilities as they move toward an access point. The objective is upshifting and downshifting for rate optimization and improved performance. Also known as dynamic rate shifting, adaptive rate selection, or automatic rate selection.
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Dynamic rate switching (DRS)
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The highest RF signal strength that is transmitted from a particular antenna.
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Equivalent Isotropically Radiated Power (EIRP)
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Occurs when any hardware device installed in a radio system adds a certain amount of signal attenuation.
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Insertion loss
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A level of desired signal above the minimum required signal for successful communications.
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Fade margin
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A device that intentionally generates and emits radio frequency energy by radiation or induction.
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Intentional radiator (IR)
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This law states that the change in power is equal to 1 divided by the square of the change in distance.
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Inverse square law
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A point source that radiates signal equally in all directions.
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Isotropic radiator
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A unit of power equal to 1/1000 of a watt.
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Milliwatt (mW)
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