Re: ULF: 5 characer message detection at 970 Hz

[Markus Vester <markusvester@aol.com>]

That's a very nice success Stefan!

I feel the same way about your message contents. Well in line with the announced SAQ activity:
http://www.arrl.org/news/saq-alexanderson-alternator-transmission-to-celebrate-un-day

Best 73,
Markus


-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>; Renato Romero <contact@vlf.it>
Verschickt: So, 21. Okt 2018 13:47
Betreff: ULF: 5 characer message detection at 970 Hz

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.