Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 374833800008A; Sat, 28 Jan 2012 17:03:44 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RrGMI-0003og-W0 for rs_out_1@blacksheep.org; Sat, 28 Jan 2012 22:02:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RrGMI-0003oX-9E for rsgb_lf_group@blacksheep.org; Sat, 28 Jan 2012 22:02:54 +0000 Received: from mail-we0-f171.google.com ([74.125.82.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RrGMG-0008MS-0d for rsgb_lf_group@blacksheep.org; Sat, 28 Jan 2012 22:02:54 +0000 Received: by werb14 with SMTP id b14so3737751wer.16 for ; Sat, 28 Jan 2012 14:02:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=cIr2ObzCF40MxHNlq3k2xM4wBixmZtphzweJ8OIFEIA=; b=j8jPuMrUCH3bP++z80TbLUBLm3WiWeUxeTdg9pxKB7ziR+z11E2URdwU166Mjywgew jy2/9/UpNk3PIiyTH+gODj6XnfVDc2xljhVyOeGQIzIVJiducYw/D5SBU2yjrYMaUruJ coBwq3lmLc7aRaSD38Uk+lUwGYJOt4PQ6el48= MIME-Version: 1.0 Received: by 10.216.136.27 with SMTP id v27mr4823398wei.45.1327788166082; Sat, 28 Jan 2012 14:02:46 -0800 (PST) Received: by 10.216.210.140 with HTTP; Sat, 28 Jan 2012 14:02:46 -0800 (PST) In-Reply-To: <600F77AB73BD430E801323C2BD1DA337@White> References: <4F2406CC.1000405@freenet.de> <600F77AB73BD430E801323C2BD1DA337@White> Date: Sat, 28 Jan 2012 17:02:46 -0500 Message-ID: From: "Douglas D. Williams" To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: VLF this morning in TN Content-Type: multipart/alternative; boundary=0016e6dee965f9f26f04b79dc5d8 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.5 required=5.0 tests=CELL_PHONE_BOOST,HTML_30_40, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:489417440:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d019.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d600b4f2470c05cd3 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --0016e6dee965f9f26f04b79dc5d8 Content-Type: text/plain; charset=ISO-8859-1 LOL! Yes, I suppose that is true Markus. Thanks for sharing those experiences. VLF is fun stuff. I have actually heard some whistlers in my backyard, not 10 meters from overhead powerlines, standing shivering in 0 C degree weather, snow on the ground, with a hand held receiver and tape recorder in my hand. Doug KB4OER On Sat, Jan 28, 2012 at 2:13 PM, Markus Vester wrote: > ** > Hi Doug, > > you could probably have heard the Omega's without the amplifier. One of > the fascinating radio experiences was when Geri DK8KW and I heard crisp > 11.9 kHz dashes from Alpha Krasnodar on a headphone connected to the LF > antenna, using only a line-output transformer tuned to resonance, and > nothing else inbetween. This was the same little backyard Marconi I > still use today (measured (in-)efficiency about -70 dB at 9 kHz), and an > average cheap "walkman" type headset. > > Well that was a dozen years ago. Guess I'll have to repeat the > experiment to see if I can still do it now, at age 53 ;-) Ah, this must be > the reason why we men need higher antennas as we grow old ;-) > > Good luck for your VLF work! > > Best wishes, > Markus (DF6NM) > > > *From:* Douglas D. Williams > *Sent:* Saturday, January 28, 2012 4:18 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: VLF this morning in TN > > Thank you Wolf. Those are nice captures for comparison. I see you have no > trouble receiving NAA, but the other two continental U.S. stations are much > weaker. > > The alpha stations are difficult for me to copy with the sound card, but I > can often hear them at night using my R75 and upconverter with the 250Hz CW > filter. > > The OMEGA system, when it was still active, put out some very strong > signals here. All one really needed to hear those was an audio amp, short > whip antenna, and headphones.....and sufficiently sensitive hearing. > > I find that when I listen to some of the live streaming "natural radio" > receivers in Europe, I can hear the Alphas in my right ear, but not my left > ear. Guess my high frequency hearing is starting to go. > > Doug - KB4OER > > On Sat, Jan 28, 2012 at 9:31 AM, wolf_dl4yhf wrote: > >> Hi Douglas, >> >> Nice reception there. For comparison, I have made these broadband VLF >> screenshots in the past: >> >> http://www.qsl.net/dl4yhf/vlf_**rdf/latest_vlf_spectra.htm >> >> Will add a more recent spectrogram covering the 48 kHz range later, when >> time and local QRM permits. >> >> 73, >> Wolf . >> > --0016e6dee965f9f26f04b79dc5d8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
LOL! Yes, I suppose that is true Markus. Thanks for sharing those expe= riences. VLF is fun stuff. I have actually heard some whistlers in my backy= ard, not 10 meters from overhead powerlines, standing shivering in 0 C degr= ee weather, snow on the ground, with a hand held receiver and tape recorder= in my hand.
=A0
Doug KB4OER

On S= at, Jan 28, 2012 at 2:13 PM, Markus Vester <markusvester@aol.com> wrote:
Hi Doug,
=A0
you could probably have heard the Omega's=20 without=A0the amplifier. One=A0of the fascinating radio=A0experiences=20 was when Geri DK8KW and I=A0heard=A0crisp 11.9 kHz dashes from Alpha=20 Krasnodar=A0on=A0a headphone connected to=A0the=A0LF antenna,=A0=20 using only a line-output transformer tuned to resonance, and nothing else= =20 inbetween.=A0This was the same little backyard=A0Marconi I still=A0use=20 today (measured (in-)efficiency about -70 dB=A0at 9 kHz),=A0and an average= =20 cheap "walkman" type headset.
=A0
Well that was a dozen years ago. Guess=A0I'll= =20 have to repeat the experiment=A0to see if I can still do it now, at age=20 53=A0;-) Ah, this must be the reason why=A0we men need higher antennas as= =20 we grow old ;-)=A0
=A0
Good luck for your VLF work!
=A0
Best wishes,
Markus (DF6NM)
=A0

Sent: Saturday, January 28, 2012 4:18=20 PM
Subject: Re: LF: VLF this morning in=20 TN

Thank you Wolf. Those are nice captures for=20 comparison. I see you have no trouble receiving NAA, but the other two=20 continental U.S. stations are much weaker.
=A0
The alpha stations are difficult for me to copy= =20 with the sound card, but I can often hear them at night using my R75 and=20 upconverter with the 250Hz CW filter.
=A0
The OMEGA system, when it was still active, put o= ut=20 some very strong signals here. All one really needed to hear those was an a= udio=20 amp, short whip antenna, and headphones.....and sufficiently sensitive hear= ing.=20
=A0
I find that when I listen to some of the live=20 streaming "natural radio" receivers in Europe, I can hear the Alp= has in my right=20 ear, but not my left ear. Guess my high frequency hearing is starting to=20 go.
=A0
Doug - KB4OER

On Sat, Jan 28, 2012 at 9:3= 1 AM,=20 wolf_dl4yhf <dl4yhf@freenet.de>=20 wrote:
Hi Douglas,

Nice reception the= re. For comparison, I=20 have made these broadband VLF screenshots in the past:

http://www.qsl.n= et/dl4yhf/vlf_rdf/latest_vlf_spectra.htm

Will add a more recent spectrogram covering the 48 kHz range=20 later, when time and local QRM permits.

73,
=A0 Wolf .
<= /div>

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