Looks very much like like 1/R^3 fall off - just as the equations predict.
I seem to recall the magnetic field falls off even faster - 1/R^6 sound
familiar.
Looks as if allocations at 9kHz could be a headache. If below 9kHz is not
allocated by ITU then administrations cannot issue licences / NoVs. But any
radiation there are indeed radio transmission, so should be licensed.
Does anyone have a spare 1.2H inductor, rated for 100kV at 9kHz :-)
Andy G4JNT
-----Original Message-----
From: Dick Rollema [mailto:[email protected]]
Sent: 2001-07-13 14:09
To: LF-Group
Subject: LF: Fw: Near field of 9kHz antenna
To All from PA0SE
Computer program Antenna Optimizer by K6STI permits to calculate the near
field of an antenna up to a distance of 2km. I did so for a vertical for
9kHz. I had to make it 180m high before computation was possible
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