A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?
A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?
First, convert the 50 mW signal to decibels: 50 mW = 10 * log10(50) = 17 dBm. Next, account for the 3 dB cable loss: 17 dBm - 3 dB = 14 dBm. Then, add the 9 dBi antenna gain: 14 dBm + 9 dBi = 23 dBm. Therefore, the EIRP at the antenna element is 23 dBm.
C is correct 50/2 = 25mW (3db loss) 25*2*2*2 = 200mW (9dbi antenna gain) 200mW = 23dBm