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Test your basic knowledge |
CWNA Radio Frequency Components Measurements And Mathematics
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 23 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Provides two functions in a communication system. When connected to the transmitter - it collects the AC signal that it receives from the trasmitter and directs - or radiates - the RF waves away from the antenna in a pattern specific to the antenna t
antenna
isotropic radiator
dBm
dBi
2. The highest RF signal strength that is transmitted from a particular antenna
equivalent isotropically radiated power (EIRP)
dBm
decibel (dB)
antenna
3. 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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4. Used by a wireless device to determine if another device is transmitting - also known as a clear channel assessment. An optional 802.11 parameter with a value of 0 to 255. It is designed by the hardware manufacturer as a relative measurement of the R
fade margin
link budget
watt
received signal strength indicator (RSSI)
5. A point that radiates signal equally in all directions. e.g. sun
rule of 10s and 3s
isotropic radiator
point source
dBm
6. A level of desired signal above What is required
unit of comparison
antenna
fade margin
dBi
7. The increase in gain of an antenna - conmpared to the signal of a dipole antenna. Another way of phrasing this is 'decibel gain relative to a dipole antenna'
watt
dBd
unit of comparison
dBm
8. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
system operating margin (SOM)
Newton's Inverse Square Law
isotropic radiator
9. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
watt
equivalent isotropically radiated power (EIRP)
received signal strength indicator (RSSI)
fade margin
10. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
point source
link budget
dBm
decibel (dB)
11. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
unit of power
milliwatt
equivalent isotropically radiated power (EIRP)
watt
12. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
receiver
system operating margin (SOM)
equivalent isotropically radiated power (EIRP)
transmitter
13. A point source that radiates signal equally in all directions. e.g. sun
link budget
intentional radiator (IR)
received signal strength indicator (RSSI)
isotropic radiator
14. Provides approximate values when performing RF math calculations. 4 rules
unit of comparison
intentional radiator (IR)
isotropic radiator
rule of 10s and 3s
15. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
equivalent isotropically radiated power (EIRP)
dBd
dBm
system operating margin (SOM)
16. The final component in a wireless medium. It takes the carrier signal that is received from the antenna and translates the modulated signals into 1s and 0s. it then takes this data and passes it to the computer to be processed
fade margin
antenna
watt
receiver
17. A unit of power equal to 1/1000 of a watt
transmitter
milliwatt
receive sensitivity
dBd
18. A device that intentionally generates and emits radio frequency energy by radiation or induction
system operating margin (SOM)
intentional radiator (IR)
dBm
Newton's Inverse Square Law
19. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
point source
watt
dBm
system operating margin (SOM)
20. Doubling the distance between a transmitter and 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
decibel (dB)
fade margin
transmitter
6 dB rule
21. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
decibel (dB)
point source
isotropic radiator
dBi
22. Gain or increase of power from an antenna when compared to what an isotropic radiator would generate. Another way of phrasing this is 'decibel gain relative to an isotropic radiator'
dBi
equivalent isotropically radiated power (EIRP)
point source
received signal strength indicator (RSSI)
23. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
unit of power
dBi
unit of comparison
received signal strength indicator (RSSI)