"List the three types of wave modulation:", "Amplitude Frequency Phase" "What are the three ways a wave can be modulated?", "Amplitude Frequency Phase" "How does a "Keying Method" relate to wave forms?", "A keying method describes the type of modulation used. Amplitude Shift Keying - ASKFrequency Shift Keying - FSK Phase Shift Keying - PSK" "Which keying method is used for WiFi?", "PSK - Phase Shift Keying" "What is the wavelength of the center 2.4ghz frequency?", "4.82in - 12.24cm" "What is the wavelength of the center 5ghz frequency?", "2.04in - 5.19cm" "What are the first and last channels and center frequencies used in the US for the 2.4Ghz band?", "1 - 2412mhz 11 - 2462" "What are the first and last channels and center frequencies used in the US for the 5 Ghz band?", "36 - 5180 165 - 5825" "What is the formula used to translate channels to frequency in the 5Ghz band?", "(channel) x 5 + 5000" "What are the center frequencies for channels 1 6 and 11?", "2412 2437 2462" "How many mhz separate each channel in the 2.4ghz band?", "5mhz" "How many mhz separate each 20 mhz wide channel in the 5ghz band?", "20 mhz" "What is the standard attenuation of sheetrock? brickwall? Elevator?", "3db 12db 10db" "How many DB does 2.4ghz attenuate by in 1 meter? 100 meters? 200 meters?", "40dbm 80 86" "How many DB does 5ghz attenuate by in 1 meter? 100 meters? 200 meters?", "47dbm 87 93" "How many DB does signal attenuate when the distance between systems is doubled?", "6db" "Which WiFi frames require an ACK?", "Any unicast data frames." "Convert dbm to mw: 10dbm 20dbm 26dbm 36dbm", "10mw 100mw 400mw 4000mw" "Convert dbm to mw: -16dbm -20dbm -26dbm -60dbm", ".025mw .01mw .0025mw 0.000001mw" "What does the E plane show you on an azimuth chart?", "elevation view - from the side" "What does the H plane show you on an azimuth chart?", "top down - overHead view" "What are the three types of beamforming and how are they generally used?", "Static beamforming - fixed anteanns - cell towers Dynamic beamforming - adaptive antenna array used to switch power and signal patterns - Used by Ruckus Transmit Beamforming - TxBF used in WiFi" "List the two types of TxBF", "implicit beamforming - uses channel sounding to guess optimied phasing explicit beamforming - uses vmatrix received from client to determine correct phase shift" "What is contained in the TxBF V matrix?", "amplitude and phase per TX antenna per RX antenna per subtone" "How much gain can be derived from TxBF?", "5db" "How much can the first fresnel zone be obscured before causing an unrealiable link?", "40 percent" "Does the beamwidth of the antenna have any bearing on the size of the fresnel zone?", "no" "Which fresnel zones are in-phase with the point source signal?", "1 - 3 - 5" "Which fresnel zones are out-of-phase with the point source signal?", "2 - 4 - 6" "At what distance must earth bulge be considered?", "more than 7 miles or 11 kilometers" "What antenna issue can cause a loss of 15-20db below expected received signal level?", "incorrect polarization" "What is the standard impedence for WiFi antenna systems?", "50 ohms" "What is the standard loss in db for each connection in an antenna system?", "0.5db" "What is the standard db loss for 2.4 ghz in LMR 400 cable: 100ft? 100m?", "0.2bd 0.6db"
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