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| To: | "[email protected]" <[email protected]>, Renato Romero <[email protected]> |
|---|---|
| Subject: | ULF: 5 characer message detection at 970 Hz |
| From: | DK7FC <[email protected]> |
| Date: | Sun, 21 Oct 2018 13:45:02 +0200 |
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Hi ULF friends, Last morning i transmitted a 5 character EbNaut message on the 309 km band.At 970.1 Hz i run 1.7 A antenna current into my 900 m spaced earth electrode antenna. The transmission took about 3 hours. The DC resistance was quite high this time, about 93 Ohm. Anyway i got about the same antenna current when running about 300 W. The QRN/QRM was low and just a few days ago i added a shutdown option to my solar charger. The Raspi can turn it off by switching a GPIO Pin, so the off-time can be defined into a script which is executed on the day when the transmissions happens... Best results were obtained from the E fied on its own! I got an SNR > 17 dB! See the attachment for details. The message is important these days. It should be copied by a lot more people. This is the first far field message detection below 1 kHz generated/received by amateurs. QRB, as usual, 57.6 km. 73, Stefan PS: It was a great sunny autumn day, just like today.
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