Chapter 3 RF Mathematics and Measurement

Question 1

is often used as a transmit power metric for outdoor links.

Answer 1

Watt (W)

Question 2

Is more often used as a transmit power metric for indoor links.

Answer 2

Milliwatt (mW)

Question 3

Is decibels related to mW where 0 dB=1mW

Answer 3

dBm

Question 4

Of power doubles the original power level

Answer 4

Adding 3 dB

Question 5

Of power halves the original power level

Answer 5

Removing 3 dB

Question 6

Of power multiplies the original power level by 10

Answer 6

Adding 10 dB

Question 7

Of power divides the original power level by 10

Answer 7

Removing 10 dB

Question 8

dB math with

Answer 8

10s and 3s is cumulative

Question 9

Extra db of signal strength added to the link, usually by taking it from the receive sensitivity value.

Answer 9

The Fade Margin

Question 10

The difference between the signal and the noise floor.

Answer 10

SNR (Signal to Noise Radio)

Question 11

Also considered interference sources above the noise floor, which is more realistic and is therefore growing in use as a term.

Answer 11

SINR (Signal to interference plus noise ratio)

Question 12

Decibels compared to an isotropic radiator and is used in antenna gain metrics.

Answer 12

dBi

Question 13

Is an arbitrary signal measurement of little value when compared with dBm.

Answer 13

RSSI (Received Signal Strength Indicator)