Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v4O70Ukn002964 for ; Wed, 24 May 2017 09:00:31 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dDQDO-0003Zd-R4 for rs_out_1@blacksheep.org; Wed, 24 May 2017 07:56:14 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dDQDG-0003ZU-NF for rsgb_lf_group@blacksheep.org; Wed, 24 May 2017 07:56:06 +0100 Received: from resqmta-ch2-11v.sys.comcast.net ([2001:558:fe21:29:69:252:207:43]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dDQDA-00081V-Qv for rsgb_lf_group@blacksheep.org; Wed, 24 May 2017 07:56:03 +0100 Received: from resomta-ch2-03v.sys.comcast.net ([69.252.207.99]) by resqmta-ch2-11v.sys.comcast.net with SMTP id DQD3dYY2gT4XXDQD6du1KK; Wed, 24 May 2017 06:55:56 +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=1495608956; bh=8/4AHV+MoW3eungdD5vFwlpnRo0afDKTF2dj87bpm8c=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=eTItiCA0SgPisKkj0k/oe5ZWVtaYehmZQ+eJTFfzU5N80sSUOvYDjTJmyfI26YtRt dfiv8e/vF3HFJoCCx2wEY3BzydxbdJRuTKMgU2YVADpjIX9cs2CHEEDuxU5j5uqm8i TXi+SRmCYMsYvnCSULb3TetLrvapkEhCSK6B2qfEqKV7KYAdqGt3969W2amCZdZlp7 5x9i9MKn4EI9DwqdQfVM8Hb50Kwn0YcS3bpA/js0BoBrASQnojW1Nr+o1jG4HtAS+P gTYAf7tv8YeNsFeLDVRK8OH+Pe3eBC62qzrvTpjWr1DhftPQKw703THSnv0ikudamj hFp/SRbmX8V/g== Received: from Owner ([IPv6:2601:140:8500:7f9f:395d:6f91:49f1:8e36]) by resomta-ch2-03v.sys.comcast.net with SMTP id DQD5dj4qwVzqSDQD5dmHgQ; Wed, 24 May 2017 06:55:56 +0000 From: To: References: <59234B8F.6010903@posteo.de> <15c34cff573-117a-973a@webprd-a101.mail.aol.com> In-Reply-To: <15c34cff573-117a-973a@webprd-a101.mail.aol.com> Date: Wed, 24 May 2017 02:55:53 -0400 Message-ID: <014201d2d45a$c9b4a510$5d1def30$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQIpqN2ywc20Im+MC/OOgseXdjcgxKFVVGNA Content-Language: en-us X-CMAE-Envelope: MS4wfODLwxioMQ+GA9YRH6mex2T7o+kZzvJ01ySTD8YNPJSryZF2yr8g71m8V3m3DA7D7qPowVqpTp7KKvyGbD3devhrNYKyjtSfP3qnDsGH9rUqPc2cSBKL wfn00XLfY/wtmutefYb+VUlPqqlge7uFqHQ= X-Scan-Signature: 39b95da199347a6a932fd03c8ef722b2 Subject: RE: ULF: New experiment on 970 Hz, 2/3 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0143_01D2D439.42A30510" 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 X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11746 This is a multipart message in MIME format. ------=_NextPart_000_0143_01D2D439.42A30510 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Markus and Stefan, =20 I found a quantitative/qualitative close match to Stefan=E2=80=99s 100 = Hz =E2=80=93 2900 Hz spectrum: a local-thunderstorm example (described = as typical) designating the TE/TM, weak TEM, and (strong) qTEM regions, = showing TEM-qTEM null near 1.5 kHz; with field strength ratios between = TE/TM, weak TEM, TEM-qTEM null, and qTEM regions close to the = corresponding ratios in Stefan=E2=80=99s 100 Hz =E2=80=93 2900 Hz = spectrum. Also a Wait-derived Watt example that would quantitatively not = agree well with Stefan=E2=80=99s spectrum for thunderstorms = substantially more distant than 40km, but would agree for thunderstorms = substantially closer than 40km. I tried to reduce resolution of and crop = the examples but their combined size is still megabytes. If = you=E2=80=99re interested in those documents I=E2=80=99ll set up a = dropbox. =20 Given all of the variables I don=E2=80=99t think that the above is = strong support; but perhaps better than anecdotal support of = reasonableness of the 100 Hz =E2=80=93 2900 Hz spectrum if the = thunderstorms were closer than 40km. =20 =20 73, =20 Jim AA5BW =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Tuesday, May 23, 2017 6:18 AM To: rsgb_lf_group@blacksheep.org Subject: Re: ULF: New experiment on 970 Hz, 2/3 =20 Hi Stefan, the screenshot generally looks good. There are some 50 Hz harmonics as = well as modulated 33 Hz harmonics but neither seems to contaminate the = desired frequency range around 9.70 hectoHz. However to my eyes, the nighttime spherics seem to be much stronger at = low frequency (< 1.2 kHz) than I had expected, though I have to say I'm = not at all sure whether that should be so or not. I would speculate that = they could be artifacts from higher frequency spherics energy, which may = be AM-demodulated by some quadratic nonlinearity in the receive = circuitry (e.g. the FET at the input), producing a low-frequency = envelope component.=20 You could check this in a benchtop measurement by feeding a two-tone = signal (e.g. 5 and 5.5 kHz, with PEP level approximating that of the = strongest spherics) to the receiver, and measuring second-order = intermodulation (IM2) at the 500 Hz difference frequency. If this indeed = turns out to be significant, you could possibly improve your recording a = posteriori by subtracting an appropriately weighted squared signal = component. Perhaps this could even be done on the fly using SpecLab's = built-in multiplier and adder functions. Best regards, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Cc: Renato Romero ; =D0=90=D0=BD=D0=B4=D1=80=D0=B5=D0=B9 = =D0=9A=D0=BB=D0=B8=D0=BC=D0=BE=D0=B2 Verschickt: Mo, 22. Mai 2017 22:37 Betreff: Re: ULF: New experiment on 970 Hz, 2/3 Hi ULF,=20 So far the recent 970 Hz experiment went very well: -The transmissions were done as planned. I slightly modified the = transmission plan and sent 2 EbNaut messages. The TX was running almost = 4 days without interruptions, despite the heavy rain and local = thunderstorms. -When coming back to the RX site, everything was in its right place. The = 4x 7 Ah lead gel accus were discharged to 12.1 V only. The recording = process was still running.=20 -I have now a 30 GB .dat file on the USB stick. This file will be = analysed in the coming days. I hope to extract a clear carrier and maybe = even decode the EbNaut messages? A first image showing the 0...3 kHz spectrum without filters and = blanker: = https://www.dropbox.com/s/26bbkfb8q0hs20h/First%20two%20days%20from%20the= %20recording.%20No%20filters%20and%20blankers.png?dl=3D0 (there is a bug = on the timescale) Does this look normal for the experts? Any comments/ideas? Unfortunately there was a microphonic effect on the E field antenne. I = can hear bumblebees from time to time!! ;-) 73, Stefan Am 17.05.2017 12:07, schrieb DK7FC:=20 Hi all,=20 Yesterday it was a perfect day here, sunny all the time, about 26 = =C2=B0C, the forests have a fresh green :-) ...and i put a ULF E-field = RX somewhere into JN49LN :-) It will record about 4 days at 24 kS/s. It is the next experiment on the 309 km band. Since 16.May.2017 a plain = carrier is running on 970.005 Hz. I'm again using the modified mains = transformer which generates just 5 kV on the antenna. In SpecLab i'm = keeping 15 mA antenna current constant, as well as the phase of the = signal. That results in an ERP of about 3 nW. The active E field probe is a 1m vertical and 3m horizontal wire, lifted = about 10m above ground. The attempt is to reach a 27 km distance! First i searched for a 25 km = distant location but when i arrived there, there were loads of = electrical fences.=20 In the new location i took a short recording which can be analysed now. = The spectrum contains relatively high levels of mains hum, but all in = all it looks fine. So far the QRN levels are relatively low, which is good. I made a few adjustments to the receiver, hopefully it performs nicely.=20 I expect maybe a very faint trace in 424 uHz when QRN is low but it = should be a clear trace in 47 uHz. The transmission plan is to keep the carrier on the air until midnight, = i.e. 33 hours for the carrier. Then Thursday 0 UTC an EbNaut message = (N=3D5, CRC=3D4, 100s, 16K21A , 24:00:00 hh:mm:ss) will start at 970.005 = Hz. Friday and Saturday will be for a carrier at 970.0025 Hz. So far the carrier runs very well. Hopefully it will be a successful = experiment again :-) 73, Stefan ------=_NextPart_000_0143_01D2D439.42A30510 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Markus and Stefan,

 

I found a quantitative/qualitative close match to Stefan=E2=80=99s = 100 Hz =E2=80=93 2900 Hz spectrum: a local-thunderstorm example = (described as typical) designating the TE/TM, weak TEM, and (strong) = qTEM regions, showing TEM-qTEM null near 1.5 kHz; with field strength = ratios between TE/TM, weak TEM, TEM-qTEM null, and qTEM regions close to = the corresponding ratios in Stefan=E2=80=99s 100 Hz =E2=80=93 2900 Hz = spectrum. Also a Wait-derived Watt example that would quantitatively not = agree well with Stefan=E2=80=99s spectrum for thunderstorms = substantially more distant than 40km, but would agree for thunderstorms = substantially closer than 40km. I tried to reduce resolution of and crop = the examples but their combined size is still megabytes. If = you=E2=80=99re interested in those documents I=E2=80=99ll set up a = dropbox.

 

Given all of the variables I don=E2=80=99t think that the above is = strong support; but perhaps better than anecdotal support of = reasonableness of the 100 Hz =E2=80=93 2900 Hz spectrum if the = thunderstorms were closer than 40km. =C2=A0

 

73,

 

Jim AA5BW

 

From:= = owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus = Vester
Sent: Tuesday, May 23, 2017 6:18 AM
To: = rsgb_lf_group@blacksheep.org
Subject: Re: ULF: New experiment = on 970 Hz, 2/3

 

H= i Stefan,

<= br>the screenshot generally looks good. There are some 50 Hz harmonics = as well as modulated 33 Hz harmonics but neither seems to contaminate = the desired frequency range around 9.70 = hectoHz.

<= br>However to my eyes, the nighttime spherics seem to be much stronger = at low frequency (< 1.2 kHz) than I had expected, though I have to = say I'm not at all sure whether that should be so or not. I would = speculate that they could be artifacts from higher frequency spherics = energy, which may be AM-demodulated by some quadratic nonlinearity in = the receive circuitry (e.g. the FET at the input), producing a = low-frequency envelope component.

<= br>You could check this in a benchtop measurement by feeding a two-tone = signal (e.g. 5 and 5.5 kHz, with PEP level approximating that of the = strongest spherics) to the receiver, and measuring second-order = intermodulation (IM2) at the 500 Hz difference frequency. If this indeed = turns out to be significant, you could possibly improve your recording a = posteriori by subtracting an appropriately weighted squared signal = component. Perhaps this could even be done on the fly using SpecLab's = built-in multiplier and adder = functions.

<= br>Best regards,
Markus (DF6NM)

<= br>
-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
= An: rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Cc: Renato Romero <contact@vlf.it>; = =D0=90=D0=BD=D0=B4=D1=80=D0=B5=D0=B9 = =D0=9A=D0=BB=D0=B8=D0=BC=D0=BE=D0=B2 <rd4hu@MAIL.ru>
Verschickt: Mo, = 22. Mai 2017 22:37
Betreff: Re: ULF: New experiment on 970 Hz, = 2/3

H= i ULF,

So far the recent 970 Hz experiment went very = well:

-The transmissions were done as planned. I slightly = modified the transmission plan and sent 2 EbNaut messages. The TX was = running almost 4 days without interruptions, despite the heavy rain and = local thunderstorms.
-When coming back to the RX site, everything was = in its right place. The 4x 7 Ah lead gel accus were discharged to 12.1 V = only. The recording process was still running.
-I have now a 30 GB = .dat file on the USB stick. This file will be analysed in the coming = days. I hope to extract a clear carrier and maybe even decode the EbNaut = messages?

A first image showing the 0...3 kHz spectrum without = filters and blanker: https://www.dropbox.com/s/26bbkfb8q0hs20h/First%20two%2= 0days%20from%20the%20recording.%20No%20filters%20and%20blankers.png?dl=3D= 0 (there is a bug on the timescale)

Does this look normal for = the experts? Any comments/ideas?
Unfortunately there was a = microphonic effect on the E field antenne. I can hear bumblebees from = time to time!! ;-)

73, Stefan




Am 17.05.2017 = 12:07, schrieb DK7FC:

H= i all,

Yesterday it was a perfect day here, sunny all the time, = about 26 =C2=B0C, the forests have a fresh green :-) ...and i put a ULF = E-field RX somewhere into JN49LN :-) It will record about 4 days = at 24 kS/s.
It is the next experiment on the 309 km band. = Since 16.May.2017 a plain carrier is running on 970.005 Hz. I'm = again using the modified mains transformer which generates just 5 kV on = the antenna. In SpecLab i'm keeping 15 mA antenna current = constant, as well as the phase of the signal. That results in an = ERP of about 3 nW.

The active E field probe is a 1m = vertical and 3m horizontal wire, lifted about 10m above ground.
The = attempt is to reach a 27 km distance! First i searched for a 25 = km distant location but when i arrived there, there were loads of = electrical fences.
In the new location i took a short recording = which can be analysed now. The spectrum contains relatively high levels = of mains hum, but all in all it looks fine.
So far the QRN levels are = relatively low, which is good.
I made a few adjustments to the = receiver, hopefully it performs nicely.

I expect maybe a very = faint trace in 424 uHz when QRN is low but it should be a clear trace in = 47 uHz.

The transmission plan is to keep the carrier on the air = until midnight, i.e. 33 hours for the carrier. Then Thursday 0 UTC an = EbNaut message (N=3D5, CRC=3D4, 100s, 16K21A , 24:00:00 hh:mm:ss) will = start at 970.005 Hz. Friday and Saturday will be for a carrier at = 970.0025 Hz.

So far the carrier runs very well. Hopefully it will = be a successful experiment again :-)

73, = Stefan

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