Dear Jim, Stefan, LF group,
BTW, if my guess of 5mV/m is correct, and
the loop EMF is 44mV, the effective loop area would be about 18000m^2...
that sounds impressive, based on the antenna length (280m) the "hight"
of the loop would be 64m.
At 9kHz the radiation resistance of a
18000 m^2 loop is a mere 8 micro-Ohm, thus a current of 11A is needed
to radiate 1mW.
But as the penetration depth into the earth is inverse
proportional to the square root of the frequency the effective loop
area at 9kHz might be 29000 m^2, increasing the radiation resistance to
over 20 micro-Ohm. What means that 7A antenna current is need to get
1mW radiated.
But even that would require many kW.
73, Rik ON7YD
________________________________________
Van: [email protected]
[[email protected]] namens James Moritz
[[email protected]]
Verzonden: donderdag 15 juli 2010 1:40
Aan: [email protected]
Onderwerp: LF: RE: DLF passive received with earth antenna
