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Re: VLF: Trying 6.47 kHz again,

To: [email protected]
Subject: Re: VLF: Trying 6.47 kHz again,
From: DK7FC <[email protected]>
Date: Sat, 21 May 2016 00:50:31 +0200
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Hi Markus,

OK, the latest EbNaut message is finished and the carrier is continuing. I'll let it on the air until tomorrow then we will see.

Also, for everybodys information, Renato Romero has updated his Dreamers Band grabber window for 8270 Hz and 6470 Hz, see

The distance to me is 510 km. I'm not sure if there is a chance to leave a trace there but it's not completely unrealistic in that bandwidth.

73, Stefan

Am 20.05.2016 15:17, schrieb Markus Vester:
Armed with more effective autonotch filter settings and Wolf's latest comb-notch option, I decided to have another go at receiving 6470 Hz. It looks like the railway QRM in the narrowband spectrograms has indeed gone down significantly. Of course with aggressive filtering and blanking there's always a risk to kill desired signal as well, throwing out the baby with the bathwater. As a check, I have added two artificial carriers at -110 dB target level (same as DL3NDR on 8.27 kHz).

Stefan, if you like you could perhaps try another long 6.47 kHz carrier tomorrow or Sunday. If I can see it we mihght be able to compare daytime propagation patterns between the two frequency bands.

Best 73,
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