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| To: | "[email protected]" <[email protected]> |
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| Subject: | ULF: First far field detection at 1570 Hz |
| From: | DK7FC <[email protected]> |
| Date: | Wed, 05 Sep 2018 14:51:22 +0200 |
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ULF,Last sunday i finally managed to detect a carrier transmission on the 191 km band in the far field. In fact the distance is higher than 1/4 wavelength. A new lowest frequency of a signal generated by amateurs, detected in the far field. At 250 W RF power i transmitted for 2 hours (starting 08:08 UTC) on my 900m long ground loop antenna. It seems to be a very hard band with poor propagation. Furthermore my RX antenna becomes deaf below 2 kHz. So the S/N is much lower as expected when comparing to the results at 1970 Hz. Two spectrograms are arrached, showing the short trace in 424 uHz and 212 uHz. Before finally entering the far field in the frequency range below 1 kHz it may be necessary to build up an E field RX at the RX QTH. I first step for that was done yesterday. To be continued... 73, Stefan
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