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