To: | [email protected], [email protected] |
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Subject: | Re: VLF: First VLF detection DL > EA |
From: | Markus Vester <[email protected]> |
Date: | Tue, 5 Dec 2017 19:36:03 -0500 |
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In-reply-to: | <[email protected]> |
Reply-to: | [email protected] |
Sender: | [email protected] |
Found my error, I had the starttime wrong by one hour. Perfect decode now!
Lesson #1: Don't always blame propagation... Best 73, Markus -----Ursprüngliche Mitteilung----- Von: Markus Vester <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Mi, 6. Dez 2017 0:21 Betreff: Re: VLF: First VLF detection DL > EA A strong signal here in Nuernberg, showing an easily visible noise band on my grabber. But strangely no "E" decode came out. There might have been a propagation dip with a phase inversion around 13:20 UT. Hi Stefan, Luis, Paul, VLFBest regards, Markus (DF6NM) -----Ursprüngliche Mitteilung----- Von: Riccardo Zoli <[email protected]> An: LF Group <[email protected]>; DK7FC <[email protected]> Verschickt: Di, 5. Dez 2017 20:23 Betreff: Re: VLF: First VLF detection DL > EA this is my decode (the first in VLF). Very strong here, despite noisy reception. Stefan, please could you try to send a faster message after sunset, when SNR of your carrier is much better? I made some tests whith EbNaut decoder: " ****** " message appear on your carrier with 2 or 3 sec./sym (with a few +dBs of Eb/N0). All the best 73 de Riccardo IW4DXW 2017-12-04 21:49 GMT+00:00 DK7FC <[email protected]>: > Hi VLF, > > Tomorrow i'm going to gtry to pass a first EbNaut message over to EA5DOM. > Here are the details: > > f = 17470.1000 Hz > Start time: 05.Dec.2017 07:00:00 UTC > Symbol period: 120 s > Characters: 1 > CRC bits: 6 > Coding 8K19A > Duration: 08:00 [hh:mm] > Antenna current: 1 A > > 73, Stefan > > > > Am 02.12.2017 13:31, schrieb VIGILANT Luis Fernández: > > Hi VLF > > Congratulations Stefan and thank you all for the good information exchanges > in the reflector > > It is all the effort at your side Stefan. I still didn't do the homework to > decrease the local QRM, which is > quite high as you can see in the 25KHz spectrogram. There is a very nasty > noise which appeared just > this last couple of days and affects exactly 17470Hz. It is random and runs > for a couple hours. Can be seen > as vertical noise lines in the lower spectrograms and is very noticeable in > the 47uH spectrogram > > It is my first detection of Ham activity under LF so far. And there is a lot > to improve to get same results > at 8270Hz. A new Rx setup in a different (hopefully cleaner) QTH is in the > "To Do" list ;-) > > 73 de Luis > EA5DOM > > ________________________________ > De: owner-[email protected] [owner-[email protected]] > en nombre de Daniele Caccia [[email protected]] > Enviado: sábado, 2 de diciembre de 2017 12:07 > Para: [email protected] > Asunto: Re: VLF: First VLF detection DL > EA > > Dear VLF er > > Congratulations to all for the results obtained so far! > > Best regards from Daniele SWL I55387FI -ITALY- > > > > > > > 2017-12-02 10:30 GMT+01:00 Alberto Martinez <[email protected]>: >> >> Congratulation Stefan and Luis! >> >> It´s weak but seeable. very good work. >> >> 73. >> Alberto-EA4GHB >> >> 2017-12-02 9:57 GMT+01:00 DK7FC <[email protected]>: >>> >>> Hello VLF friends, >>> >>> This morning i looked on the EA5DOM VLF grabber and saw much better >>> traces of the carrier on 17.4701 kHz. >>> https://ea5dom.ure.es/grabber/index.html >>> >>> I find this is a valid one-way contact or carrier detection and i think >>> it is the first time that this was done by amateurs between DL and EA. >>> A distance of 1393 km, http://k7fry.com/grid/?qth=IM98XN&from=jn49ik00wd >>> >>> It looks like there is some QSB on that path, higher than observed a >>> similar distance at 8270 Hz. >>> We can now think about improvements and about a first message attempt... >>> >>> 73, Stefan >>> >> >
17k47_21uHz_12051505a_result.png
17k47_21uHz_12051505a_sym.png |
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