[Elecraft] Random wires

[Edward R Cole]

I had to calculate my radiation resistance to comply with the license 
requirements on 600m.

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.

go to: http://www.kl7uw.com/600m.htm
click on the EzNec model for the antenna analysis and ERP calculation 
for the rest.

*Note the antenna was shortened from 130 to 122 feet to improve 
tension on the top-hat section.

73, Ed - KL7UW
http://www.kl7uw.com
dubususa at gmail.com
"Kits made by KL7UW"