Karteikarten
03
Karten in diesem Stapel (19)
- 1TransmitterGenerates AC signal
Takes data and modifies the AC signal using a modulation technique
Responsible for determining the transmission amplitude - 2AntennaReceives AC signal from transmitter and radiates RF waves or receives RF waves
- 3Intentional Radiator (IR)Intentionally generates radio frequency
- 4EIRPEquivalent Isotropically Radiated Power
Highest RF signal strength transmitted from an antenna - 5Units of absolute powerwatt (W)
milliwatt (mW)
decibels relative to 1 mW (dBm) - 6Units of comparison (relative)decibel (dB)
decibels relative to an isotropic radiator (dBi)
decibels relative to a half-wave dipole antenna (dBd) - 7Watt1 watt = 1 amp of current flowing at 1 volt
Amount of watts generated is = to volts * amps - 8MilliwattmW
Unit of power, 1/1000 of a watt - 9DecibeldB
Unit of comparison
Represents a difference between two values / measurement of change in power
Often used to compare power of two transmitters or difference or loss between EIRP output of a transmitter's antenna - 10dBiGain/increase/power from an antenna when compared to an isotropic radiator
Relative measurement of antenna gain - 11dBdDescribes antenna gain in decibels dipole
Increase in gain compared to signal of a dipole antenna - 12dBmComparison of signal to 1 mW
Because of FSPL, received signals will always measure below 1 mW - 13Rules of 10s and 3sFor every 3 dB gain (relative), double absolute power (mW)
For every 3 dB of loss (relative), halve absolute power (mW)
For every 10 dB gain (relative), multiply absolute power (mW) by factor of 10
For every 10 dB loss (relative), divide absolute power (mW) by factor of 10 - 14What is noise floorAmbient or background level of radio energy on a specific channel
- 15What is SNRSignal-to-noise ratio
Difference in decibels between received signal and background noise level (noise floor) - 16What is RSSIReceived Signal Strength Indicator
Power level of signal required to be successfully received by the receiver radio
Relative metric used by radios to measure signal strength. Expressed in absolute dBm values - 17What is link budgetSum of all planned and expected gains and losses from the transmitting radio through the RF medium to the receiver radio
- 18What is fade marginLevel of desired signal above what is required
- 19What is System Operating MarginPlanning for the buffer.
Difference between actual received signal and signal necessary for reliable communications
Informationen
- Beschreibung
- cwna CWNA Karteikarten am 03, erstellt von rowelld am 06/09/2015.
- Erstellt von
- rowelld
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- 39
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