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Re: LF: EbNaut at 8270.01953125

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: EbNaut at 8270.01953125
From: DK7FC <[email protected]>
Date: Wed, 10 Jan 2018 15:21:06 +0100
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Hello Riccardo,

I got you. What a big signal! My congrats to your TX station! Since i missed some weeks, i'm a nit late now. Meanwhile almost a boring distance for you? ;-)
It is my frist VLF reception from Italy, very nice. The other way was between me and Renato Romero in 2010.
The message and signal strength seems to be quite clear, i think i don't need to ask for confirmation :-)
A capture is in attachment. I got a slightly better Eb/N0 when using a small frequency offset.
Good luck to reach Alex (or did you already? I lost the overview). And maybe Jay is lurking?

73, Stefan



Am 09.01.2018 20:15, schrieb Riccardo Zoli:

Hi Paul, Stefan, Andy, Markus....VLF

My specified QRG (printed with all decimals) is obviously theoretical. It permits, as Paul well explained, to achieve in days maximum reference phase precision for RX stations.
The value is obtained by a simple calculation:

my GPSDO is tuned at 16384.000 kHz and clocking a DDS programmed with a tuning dword = 8671744. DDS output is finally divided by 4 (SDR quadrature generator).

((16384000 / 2^32) * 8671744) / 4 =
8270.01953125

Thanks for reports.
This night, 5th attempt.
Same parameters, start time 18:30 UTC.


All the best


73 de Riccardo IW4DXW

Attachment: IW4DXW_8270Hz.png
Description: PNG image

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