NETW360 Week 1 iLab: Basic RF Calculations

The power emitted from wireless devices, especially in unlicensed bands, such as 2.4 GHz and 5 GHz, are regulated by the Federal Communications Commission (FCC). Wireless network professionals must calculate power levels (or RF signal strength) that are being transmitted by wireless devices to make sure their designs are complaint with FCC regulations. They also need to calculate power levels that are being received by wireless devices to make sure the signal is properly received at the destination.

RF power can be measured in two ways: on the linear scale, by the number of watts that are being transmitted; and on a relative scale, by the number of decibels (dBs) instead of watts.

Decibel*…show more content…*

__52___

· Applying the 3’s and 10’s rules, what’s 16 mW + 40 dBm in mW? __156,250___

The same idea can be applied to conversions from dBm to mW when a dBm value is not readily available in the 3’s and 10’s rules table.

For instance, what is 13 dBm in mW?

First, 13 dBm = 0 dBm + 10 dBm + 3 dBm, where 0 dBm, 10 dBm, and 3 dBm are in the table.

Next, let’s apply the following 3’s and 10’s rules:

· 0 dBm = 1 mW

· When the dBm value increases by adding 10, the mW value increases by the factor of 10.

· When the dBm value increases by adding 3, the mW value increases by the factor of 2.

Finally, we have 13 dBm = 0 dBm + 10 dBm + 3 dBm = 1 mW × 10 × 2 = 20 mW.

· Applying the 3’s and 10’s rules, what’s 7 dBm in mW (must show steps)?

Answer: 7dBm=10dBm-3dBm=10mW/2mW =5mW

· Applying the 3’s and 10’s rules, what’s 4 dBm in mW (must show steps)?

Answer: 4dBm=10dBm-6dBm=10mW/4mW=2.5mW

· Applying the 3’s and 10’s rules, what’s 9 dBm in mW (must show steps)?

Answer: 9dBm=8mW

· Applying the 3’s and 10’s rules, what’s -7 dBm in mW (must show steps)?

Answer:

The power emitted from wireless devices, especially in unlicensed bands, such as 2.4 GHz and 5 GHz, are regulated by the Federal Communications Commission (FCC). Wireless network professionals must calculate power levels (or RF signal strength) that are being transmitted by wireless devices to make sure their designs are complaint with FCC regulations. They also need to calculate power levels that are being received by wireless devices to make sure the signal is properly received at the destination.

RF power can be measured in two ways: on the linear scale, by the number of watts that are being transmitted; and on a relative scale, by the number of decibels (dBs) instead of watts.

Decibel

__52___

· Applying the 3’s and 10’s rules, what’s 16 mW + 40 dBm in mW? __156,250___

The same idea can be applied to conversions from dBm to mW when a dBm value is not readily available in the 3’s and 10’s rules table.

For instance, what is 13 dBm in mW?

First, 13 dBm = 0 dBm + 10 dBm + 3 dBm, where 0 dBm, 10 dBm, and 3 dBm are in the table.

Next, let’s apply the following 3’s and 10’s rules:

· 0 dBm = 1 mW

· When the dBm value increases by adding 10, the mW value increases by the factor of 10.

· When the dBm value increases by adding 3, the mW value increases by the factor of 2.

Finally, we have 13 dBm = 0 dBm + 10 dBm + 3 dBm = 1 mW × 10 × 2 = 20 mW.

· Applying the 3’s and 10’s rules, what’s 7 dBm in mW (must show steps)?

Answer: 7dBm=10dBm-3dBm=10mW/2mW =5mW

· Applying the 3’s and 10’s rules, what’s 4 dBm in mW (must show steps)?

Answer: 4dBm=10dBm-6dBm=10mW/4mW=2.5mW

· Applying the 3’s and 10’s rules, what’s 9 dBm in mW (must show steps)?

Answer: 9dBm=8mW

· Applying the 3’s and 10’s rules, what’s -7 dBm in mW (must show steps)?

Answer:

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