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| To: | [email protected] |
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| Subject: | Re: VLF: EbNaut on 2 frequencies |
| From: | Paul Nicholson <[email protected]> |
| Date: | Tue, 17 Oct 2017 16:38:40 +0000 |
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I ran my homebrew propagation model on the great circle from DK7FC in direction of Todmorden. Here's the received signal for the two frequencies, http://abelian.org/vlf/tmp/171017c.gif given 200mA current and antenna effective height of 20m. Todmorden is at 881 km and the rxed flux density is 6430 Hz: 0.032fT 6510 Hz: 0.046fT so 6510 is about 3dB stronger than 6430. The model uses the international reference ionosphere https://en.wikipedia.org/wiki/International_Reference_Ionosphere and takes account of date, time and bearing. It is ray tracing ground wave and in this case up to 18 hop sky waves. Actually 12 hops seems enough. -- Paul Nicholson -- |
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