I need to intall two 1310 bridges 1Km each other with external antennas. I'm in spain, and the maximun EIRP allowed is 20dBm.
EIRP=transmitter power + antenna gain - cable loss
The antenna gain is 13,5dB and the cable loss is 6,6dB, then the maximun tansmitter power should be 13,1dBm (20mW) If I use the Outdoor Bridge Range Calculation Utility, configuring regulatory domain ETSI, bridge 1310 with remote antenna, datarate 54, OFDM, 13,5dBi Yagui, cable 150 feet ultra low loss, I only can configure 1mW as power level. Why I cannot configure 20mW?. If I change to CCK (11Mbps) I can configure up to 5mW, why more than for OFDM? and why I cannot configure up to 20mW in both CCK and OFDM? I will continue within the EIRP limits...