[Elecraft] Random wires

[KU4AF]

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.




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