Return to KLUBNL.PL main page

[Top] [All Lists]

Re: VLF: Carrier on 8270.0025 Hz

To: [email protected]
Subject: Re: VLF: Carrier on 8270.0025 Hz
From: Paul Nicholson <[email protected]>
Date: Mon, 16 Jan 2017 09:09:28 +0000
Dkim-signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=ClYYlB9fCY8mkD09frTJVOhgok6uVELQIBZqICgOv5o=; b=oPfepKtH47/LSoE9t/KVJD9qsY AFIdYlOe7cOxmQb0WLWxVlr8bHO7fM89KOgZm/7e2oDX0gcus3FgxRha/aHSfQsxydbdM3CoGO8cc RwhTCvBlSd1g8wBexvcJ1H3WvvrYG1eIpANsPMEiNopPl9cjQXf7MEcaiTFVQ1slykSk=;
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0
Stefan wrote:

> Since 22:45 UTC i'm running a plain and stable carrier
> Carrier stopped 00:05 UTC.

A strong signal!  About 0.35 fT,  18.0 dB in 208uHz.

Could have sent 11 chars with the 80 minute signal.

 vtread -T 2017-01-15_22:45,+80m /raw |  # Extract signal, 3 chans
   vtmix -c 0.866/-20,-0.5/-35,-0.85 |   # Antenna mix and phase EQ
   vtfilter -h bp,f=8270,w=3000 |        # 3kHz bandpass
   vtblank -a2.2 -d0 -t1 |               # Blanking
   vtmult -f8270.0025 |        # Mix down to baseband I/Q
   vtresample -r240 |          # Drop to 240 samples/sec
   vtraw -oa |                 # Convert to 3 column ASCII
   ebnaut -r240 -dp16K25A -N11 -S2.8 -PS -c8 -L350000 -v

found rank 399 ber 4.0035e-01 Eb/N0 -0.6
M -2.546543181e-01 [***********] ps [  2   30   30   30   30]

> but the BEEEEP is very loud!

Audible at 8270, not 16450.  Can anyone explain why the sound
is at the signal frequency and not the 2nd harmonic?

Paul Nicholson

<Prev in Thread] Current Thread [Next in Thread>