![]() ![]() ![]() GW dBm = 14 dBm - antenna dBi + 2.15 dBi - cable loss in dBįor example when a 8dBi antenna is used with coaxial cable with a loss of 1dB cable (loss = negative gain so so -1dB) GW dBm = 14 dBm - antenne dBd - cable loss in dBįor a antenna with gain specified in dBi use : You start with 14 dBm, substract the antenna gain in dBd or when you have a antenna with dBi gain specs use the dBi and add 2.15 dBi, and finaly substract the cable losses of it.įor a antenna with gain specified in dBd use : This value can be used to calculate the optimal (and maximum) GW dBm. I think the 2.15dBm schould be changed into 14dBm. And 25 mW erp is 14dBm (to be exact 13.979 dBm). < 1,0 %3Ģ5 mW erp is the emitted power with a 2.15dBi aka 0dBd antenna (dBi = dBd + 2.15 & dBd = dBi - 2.15 ). The Dutch license free radio frequency allocation states :Ĩ65,000 - 868,600 MHz 25 mW e.r.p. This is too high, since you’re only allowed to use 2.15dBm for sending. The antenna I use is a GP901 ground plane antenna. ![]()
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