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