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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. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
6 dB rule
transmitter
link budget
unit of power
2. 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
received signal strength indicator (RSSI)
link budget
antenna
receiver
3. A point source that radiates signal equally in all directions. e.g. sun
system operating margin (SOM)
point source
isotropic radiator
equivalent isotropically radiated power (EIRP)
4. A level of desired signal above What is required
Newton's Inverse Square Law
fade margin
receive sensitivity
equivalent isotropically radiated power (EIRP)
5. 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
transmitter
watt
receiver
antenna
6. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
transmitter
point source
unit of comparison
7. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
watt
link budget
unit of comparison
decibel (dB)
8. 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
fade margin
antenna
dBd
6 dB rule
9. 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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10. 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'
antenna
dBd
receiver
watt
11. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
point source
milliwatt
received signal strength indicator (RSSI)
unit of power
12. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
milliwatt
dBm
isotropic radiator
system operating margin (SOM)
13. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
dBi
unit of comparison
fade margin
decibel (dB)
14. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
system operating margin (SOM)
rule of 10s and 3s
dBd
link budget
15. The highest RF signal strength that is transmitted from a particular antenna
milliwatt
receiver
antenna
equivalent isotropically radiated power (EIRP)
16. Provides approximate values when performing RF math calculations. 4 rules
unit of power
rule of 10s and 3s
receiver
intentional radiator (IR)
17. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
watt
transmitter
milliwatt
rule of 10s and 3s
18. A point that radiates signal equally in all directions. e.g. sun
isotropic radiator
point source
receiver
dBi
19. 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'
point source
link budget
receive sensitivity
dBi
20. A unit of power equal to 1/1000 of a watt
intentional radiator (IR)
milliwatt
dBd
point source
21. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
receiver
link budget
unit of comparison
milliwatt
22. A device that intentionally generates and emits radio frequency energy by radiation or induction
intentional radiator (IR)
antenna
6 dB rule
dBm
23. 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
received signal strength indicator (RSSI)
milliwatt
isotropic radiator