> when I think they mean dBmw (an absolute measurement).
I think you may mean dBm or dBmW here. 0dBm == 1mW.
The SI symbol for Watt is ‘W’ not ‘w’.
At 2.4GHz, free space path loss is -41dB at 1m, so even a 20dBm radio and a 20dBi directional antenna (and assuming 0dB of insertion loss), the signal strength at 1m is -1dBm, or about 0.79 mW.
At 3m, the free space path loss is nearly -50dB. Now the signal from the setup above is at -10dBm, or 0.1mW.
I think you may mean dBm or dBmW here. 0dBm == 1mW.
The SI symbol for Watt is ‘W’ not ‘w’.
At 2.4GHz, free space path loss is -41dB at 1m, so even a 20dBm radio and a 20dBi directional antenna (and assuming 0dB of insertion loss), the signal strength at 1m is -1dBm, or about 0.79 mW.
At 3m, the free space path loss is nearly -50dB. Now the signal from the setup above is at -10dBm, or 0.1mW.
https://ecfsapi.fcc.gov/file/10417871820142/2018%2BRF%2BRadi...