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Subject:  Re: LF: DCF39 ERP and field strength 
From:  Dick Rollema <[email protected]> 
Date:  Tue, 16 May 2006 12:44:56 +0200 
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Hello José, I found the following results for DCF39, using the CCIR curves: Sea Water, average salinity, conductivity 5 S/m, dielectric constant 70, EMRP = 40 kW. Wet Ground, conductivity 10 mS, dielectric constant 30, EMRP = 40 kW Land, conductivity 3 mS, dielectric constant 22, EMRP = 108 kW. Medium dry ground, conductivity 1 mS, dielectric constant 15, EMRP = 1364 kW. 1 kW EMRP produces 300 mV/m at 1 km distance. At 500 km over perfect (flat) ground 1 kW EMRP would produce 300/500 = 0.6 mV/m. I measure 2078 µV/m. Over perfect ground this would correspond to (2078/600) squared x 1 kW = 12 kW EMRP. So even over almost perfect conducting sea water there is 10log (40/12) = 5.2 dB extra path loss. I think this must be refraction loss due to the curvature of the earth. 73, Dick, PA0SE At 01:00 16506, you wrote: Hello Dick: 
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