Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id vB8JfV62007686 for ; Fri, 8 Dec 2017 20:41:32 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eNOLD-0007Vg-JJ for rs_out_1@blacksheep.org; Fri, 08 Dec 2017 19:29:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eNOLC-0007VX-H7 for rsgb_lf_group@blacksheep.org; Fri, 08 Dec 2017 19:29:46 +0000 Received: from resqmta-ch2-12v.sys.comcast.net ([2001:558:fe21:29:69:252:207:44]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eNOL8-0000L3-OL for rsgb_lf_group@blacksheep.org; Fri, 08 Dec 2017 19:29:45 +0000 Received: from resomta-ch2-18v.sys.comcast.net ([69.252.207.114]) by resqmta-ch2-12v.sys.comcast.net with ESMTP id NOK6esyYTc634NOL4eK1Go; Fri, 08 Dec 2017 19:29:38 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1512761378; bh=I15DYoSdSXSWUA/AYQY++5AQCmCOWbE3f0v7gnjl+68=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=pnCpEs5m69btgAEMHbD4zYQ9UFzXHmpRvOHqJJpr9RsK76FmCczJnVwnzgpaz/+l8 snZUkmTL5w7576KENpwmZ0R5jfu1L9fbK9pvNRYWoD8+rh1pxsm42WKBLLnKZ846GN mbntGMe6hRSrM36z46Iam2LO2885yBDHvTcYwfhCOb5Nxm8ECNNRY0k4Z2s5txDzBX H3D2Hs/98lSDX0vq9tre6OzC/EA+PZ3LnS21LaWC/XEbjr1FEhFOV9/MsjLBZ1W7sn yJzGd6AuEd7uXX1i50tvNl6ccIf43VXuKaCERm7DMu+a6dKDvXTviu2j24IXyzfJuQ zdWN4B8v7QOSw== Received: from Owner ([IPv6:2601:140:8500:7f9f:78f6:dd:b547:d008]) by resomta-ch2-18v.sys.comcast.net with SMTP id NOL2esekoyBH2NOL3eXhLF; Fri, 08 Dec 2017 19:29:37 +0000 From: To: References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <5A1FFE7C.9050703@posteo.de> <5A226B0C.3080701@posteo.de> <579355A36AEE9D4FA555C45D556003AB9AAB0EB9@servigilant.vigilant.local> <5A25C304.3050607@posteo.de> <5A271218.9040803@posteo.de> <5A282BF9.4050409@posteo.de> <5A29193A.2090600@posteo.de> <00f101d36f83$8b02c5d0$a1085170$@comcast.net> <39d3d920-05d8-4172-f58a-4914f8f66bc1@abelian.org> <6e937a83-7603-fa2e-014e-8d52af427aa1@abelian.org > <010c01d36f96$a8117410$f8345c30$@comcast.net> <5A29AB95.3070400@posteo.de> In-Reply-To: <5A29AB95.3070400@posteo.de> Date: Fri, 8 Dec 2017 14:29:34 -0500 Message-ID: <01c501d3705a$e14cca30$a3e65e90$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQMcfBPTxY+k5qd6rWysCs3Lx7yy3QHWIIPWAkVTd/YB7ChovALAwr8pAt6GB3gBtmWaHwJfFMcgAds6SfUCQtXUqQJ+vss9ATagtrECljET7gIdR77mAWb86gQB5AJBAwHR7Z+KAYySxLgBPToStgKlekydn3FAl7A= Content-Language: en-us X-CMAE-Envelope: MS4wfOq9z2co1p83JBGA0M5KUF2E1LYWum88TP/5oauCnr8kYjfvz2jWFAt9jpgIpqwFyByox00+Y5D707MbGjB3YnjsNEcifoaHDVxTFVo5dn1nJj68ZV3F 0l2fVYgu6mghMC1Y86XZTgOHdfOQtXzUmw0= X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Stefan and Paul, All up and running per details of your suggestions, thank you. Started 192 ksps .wav file at 1500 UT. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hvanesce[at]comcast.net) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_KAM_HTML_FONT_INVALID BODY: Test for Invalidly Named or Formatted Colors in HTML 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 4ad75ad27eb9a353f40105f6e3872b5c Subject: RE: VLF: TA east to west? Content-Type: multipart/alternative; boundary="----=_NextPart_000_01C6_01D37030.F8793330" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_50_60,HTML_MESSAGE, NO_REAL_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multipart message in MIME format. ------=_NextPart_000_01C6_01D37030.F8793330 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Stefan and Paul, =20 All up and running per details of your suggestions, thank you. =20 Started 192 ksps .wav file at 1500 UT. =20 Spectrogram integration time ~ 12 hours, centered at 17470.1000 Hz =20 Antenna bearing optimized. =20 73, =20 Jim AA5BW =20 =20 =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC Sent: Thursday, December 7, 2017 3:59 PM To: rsgb_lf_group@blacksheep.org Subject: Re: VLF: TA east to west? =20 Hi Jim, Paul, Am 07.12.2017 21:04, schrieb hvanesce@comcast.net: Receiver is at 38.915547, -77.124948 =20 Or FM18KV59AS :-) As Paul suggested, i would agree that recording the audio is the best = you can do. Later you can try to create different spectrograms or try to = get an EbNaut decode. Record in stereo, with the PPS pulses on the other = channel. If you are using NMEA+PPS this would be ideal. Otherwise you = can note the start time and set it manually later. My signal is to weak to get a trace on a spectrogram in that distance = but you could try to get a single spectrum peak by using a rectangular = window (FFT register card) and select a FFT window time equal to the = common night time of 8.5 hours. Then start that SpecLab instance at 22 = UTC. After 8.5 hours you will get the first spectrum. With some luck you = can see the strongest peak right on 17470.1000 Hz. =20 8 hours raw data ~ 11 GB if I calculated correctly. 8 hours * 3600 sec/hour * 16 bit/sample * 48000 samples/sec * 2 channels = =3D 44236800000 bit =3D 5529600000 byte =3D 5.15 GB Maybe you are = referring to a sample rate of 96 kS/s, then your ~11 GB is correct. I'm not sure but i think i remember that i learned that 1 kB =3D 1024 B, = not 1000 B. But i am not sure.=20 =20 OK to use raw data from SpecLab running in Windows? Generating wav files (larger than 4 GB) works very well on SpecLab. No need for EbNaut? =20 You can do that later. Paul wrote: I'm able to log into Mike's VLF computer to extract raw signal. =20 I already wondered how you watch for a 17470 Hz signal from a 32 kS/s = vorbis stream :-) Just for fun i'm watching Alpha F1 (11904.7619 Hz) from that stream in = VA. It has 23 dB SNR in 424 uHz! 73, Stefan=20 ------=_NextPart_000_01C6_01D37030.F8793330 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Stefan and Paul,

 

All up and running per details of your suggestions, thank = you.

 

Started 192 ksps .wav file at 1500 UT.

 

Spectrogram integration time ~ 12 hours, centered at 17470.1000 = Hz

 

Antenna bearing optimized.

 

73,

 

Jim AA5BW

 

 

 

From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of = DK7FC
Sent: Thursday, December 7, 2017 3:59 = PM
To: rsgb_lf_group@blacksheep.org
Subject: Re: = VLF: TA east to west?

 

Hi Jim, = Paul,

Am 07.12.2017 21:04, schrieb hvanesce@comcast.net:

Receiver is at 38.915547, =
-77.124948
=C2=A0

Or FM18KV59AS = :-)

As Paul suggested, i would agree that recording the audio is = the best you can do. Later you can try to create different spectrograms = or try to get an EbNaut decode. Record in stereo, with the PPS pulses on = the other channel. If you are using NMEA+PPS this would be ideal. = Otherwise you can note the start time and set it manually = later.

My signal is to weak to get a trace on a spectrogram in = that distance but you could try to get a single spectrum peak by using a = rectangular window (FFT register card) and select a FFT window time = equal to the common night time of 8.5 hours. Then start that SpecLab = instance at 22 UTC. After 8.5 hours you will get the first spectrum. = With some luck you can see the strongest peak right on 17470.1000 = Hz.


 
8 hours =
raw data ~ 11 GB if I calculated correctly.

8 hours * 3600 sec/hour * 16 bit/sample * 48000 = samples/sec * 2 channels =3D 44236800000 bit =3D 5529600000 byte =3D = 5.15 GB Maybe you are referring to a sample rate of 96 kS/s, then your = ~11 GB is correct.
I'm not sure but i think i remember that i learned = that 1 kB =3D 1024 B, not 1000 B. But i am not sure. = 


 
OK to use =
raw data from SpecLab running in Windows?

Generating wav files (larger than 4 GB) works very = well on SpecLab.

 No need for =
EbNaut?
=C2=A0

You can do that later.

Paul = wrote:

I'm able to log into Mike's VLF =
computer to extract raw signal.
=C2=A0 =

I already wondered how you watch = for a 17470 Hz signal from a 32 kS/s vorbis stream :-)
Just for fun = i'm watching Alpha F1 (11904.7619 Hz) from that stream in VA. It has 23 = dB SNR in 424 uHz!

73, Stefan

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