Write a one page paper based on the information and examples given below and other research on the Rule of 10’s and 3’s.
In this example, you have an access point that is providing coverage to a specific area of a warehouse via an external directional antenna. The access point is transmitting at 30 mW. The cable and connector between the access point and the antenna creates –3 dB of signal loss. The antenna provides 20 dBi of signal gain. In this example, you will calculate the IR and EIRP values.
It is not always possible to calculate both sides of the chart by using the rule of 10s and 3s. In some cases, no matter what you do, you cannot calculate the mW value by using 10 or 2. This is one of those cases. You cannot set the mW and dBm values to be equal, but you can still calculate the mW values by using the information provided.
Even though you will not know the dBm value, you can still perform all of the necessary mathematics.
Many concepts, formulas, and examples were covered in the RF mathematics section, so we will bring things together and summarize what was covered. It is important to remember that the bottom line is that you are trying to calculate the power at different points in the RF system and the effects caused by gain or loss. If you want to perform the RF math calculations by using the logarithmic formulas, here they are:
If you want to use the rule of 10s and 3s, just remember these four simple tasks and you won’t have a problem:
Table 3.2 provides a quick reference guide comparing the absolute power measurements of milliwatts to the absolute power dBm values.
Table 3.2 dBm and milliwatt conversions
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