You're slightly more QRP than you think. Efficiency is radiation resistance divided by total resistance (not ground resistance). So your calculation should be:
efficiency = 0.83/(18+0.83) = 0.044 Running transmitter output of 100w, Total Power Radiated = 100*0.044 = 4.4w EIRP = 4.4*1.48 = 6.5w anti-Log (1.7 dB) = 1.48, gain = 1.7 dB ERP = EIRP/1.64 = 3.98w John, KU4AF Pittsboro, NC My antenna is a base loaded inverted-L: 43-feet high and 122-feet long*. Radiation resistance was taken from a EZ-NEC model as 0.83 ohms. Ground resistance was measured with an antenna analyzer as 18 ohms. efficiency = 0.83/18 = 0.046 Running transmitter output of 100w, Total Power Radiated = 100*0.046 = 4.6w EIRP = 4.6*1.48 = 6.8w anti-Log (1.7 dB) = 1.48, gain = 1.7 dB ERP = EIRP/1.64 = 4.15w which is the parameter wanted by the licensing authority. -- View this message in context: http://elecraft.365791.n2.nabble.com/Random-wires-tp7579451p7579497.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
