Re: LF: More EbNaut 137.777

[Andy Talbot <andy.g4jnt@gmail.com>]

Bit late replying to this !

You forgot to show the squared term, although the final value is correct

1579 * (10/36145)^2 = 121uR

SO.....  How come no one else spotted the equation worked out incorrectly :-)

'JNT

On 26 November 2015 at 23:50, Markus Vester <markusvester@aol.com> wrote:

>> How can I estimate Rrad for a 100m wire at 10 m average height on 8.3 kHz? 


1579 ohms * (10 m / 36145 m) = 121 microohms

 

Joe, if you wanted you could almost copy Stefan's VLF coil described on his website, using thin enameled wire on a large water barrel.

Assuming your antenna can withstand 28 kV rms, you could run 0.8 A which would instantly put you into the TA playground with Paul.

 

73, Markus

 

PS. 20 dB more will get you 10 times as far (at least in free space ;-)