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| To: | <[email protected]> |
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| Subject: | LF: Re: 500 Khz - QSO |
| From: | "James Moritz" <[email protected]> |
| Date: | Sat, 3 Sep 2011 17:33:56 +0100 |
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| Sender: | [email protected] |
Dear John, LF Group, Good signals in daytime - steady with little QSB, but some QRN just starting to build. The sea-path down the East Coast must help enormously! Looking at the map, the path Shetland - Scarborough is almost entirely over the sea, while Shetland - Lancashire/Cheshire is about 50% over the rocky ground of Scotland and NW England. Looking at the ITU ground loss curves for 500kHz, and applying the "Millington Method" for the appropriate distances and ground conductivities comes up with something like 30dB less signal at G0NBD/G4WGT compared with G3KEV, even though the distance is similar. This is easily enough to make the difference between an audible signal and one that would require long integration periods on a spectrogram to detect. It might be interesting one day for you to try transmitting slow QRSS signals during daytime ground-wave conditions, and see if your signals are detectable at inland and western UK locations to make a comparison with east-coast locations. Cheers, Jim Moritz73 de M0BMU |
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