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=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: : mailn 1480; 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 uBLH65Tp030123 for ; Wed, 21 Dec 2016 18:06:06 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cJkEB-0006t0-4w for rs_out_1@blacksheep.org; Wed, 21 Dec 2016 16:58:55 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cJkEA-0006sr-IX for rsgb_lf_group@blacksheep.org; Wed, 21 Dec 2016 16:58:54 +0000 Received: from smtp-out-3.talktalk.net ([62.24.135.67]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cJkE7-0007MN-Rf for rsgb_lf_group@blacksheep.org; Wed, 21 Dec 2016 16:58:53 +0000 Received: from malcoHP ([79.69.139.43]) by smtp.talktalk.net with SMTP id JkE6cFj3jxR4bJkE6cDzB4; Wed, 21 Dec 2016 16:58:51 +0000 X-DKIM-Result: Domain=talktalk.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=talktalk.net; s=1605; t=1482339531; bh=P7rAofYNL2f+0i5fTvXZi5T8l6g5A/atrPc0GJDDPA0=; h=From:To:References:In-Reply-To:Subject:Date; b=lk0k88sN1QTZdZdBUxeU4l9VIb0gkI76WgBEwrOGaJIYExeRat4Kcn9P+LuscdLd9 JU2IfuVHMS+j5DLRfQ8OdVsq5vkeQSWE4KYem1W6WFxe7k7n0VAYl+5ELlezZPetNt oqcallBKGKM1EgX3SMOz6EcF2nLXladfEyeXVt5U= X-Originating-IP: [79.69.139.43] X-Spam: 0 X-OAuthority: v=2.2 cv=JNN5iICb c=1 sm=1 tr=0 a=xewto85gXl5KEUA5IHIffg==:117 a=xewto85gXl5KEUA5IHIffg==:17 a=r77TgQKjGQsHNAKrUKIA:9 a=F3M5lZpKAAAA:8 a=I7zbk5rSnnXLt1ioo1QA:9 a=QEXdDO2ut3YA:10 a=C3njNO6iAAAA:8 a=GS9Z5IEu4TMltbgb8YgA:9 a=HVCRfv8ae06fus46:21 a=_W_S_7VecoQA:10 a=slCku8JSH3TyizEDQ3pD:22 a=9S9TNiF5BD-btj4edSSp:22 Message-ID: <318FE25437BE49AEBB20C23BDEDD6E1D@malcoHP> From: "mal hamilton" To: References: <158ddfd1f0b-5980-42e@webprd-a47.mail.aol.com> <584AC31C.20803@posteo.de> <584EAB0D.4060004@posteo.de> <58555BA2.7050709@posteo.de> <1482320831911.81165@kuleuven.be> <585A800D.4020708@posteo.de> In-Reply-To: <585A800D.4020708@posteo.de> Date: Wed, 21 Dec 2016 16:58:42 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3508.1109 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3508.1109 X-CMAE-Envelope: MS4wfH5o/2ZPGVDNbuvtQosu82E1vKvieL9Is1fBxxVaDqtqkaH0to4Vgj/P7jxEGo/+YBPXZJ0XW0orc4WfEsS9QrpZfJuAJ2DU0WksgJJNvQ3IxW4BI27F DmZoiDCkaqsnayctkMOODyN4nqf3Ok2CCSxO4BKWn3hU2NcDAIdTaujY X-Scan-Signature: 40cd937fc1c5e6338b07d288cd09d087 Subject: LF: Re: ULF experiment: A MEchanical Based Antenna Content-Type: multipart/alternative; boundary="----=_NextPart_000_0039_01D25BAB.7C4A8740" 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: 9887 This is a multi-part message in MIME format. ------=_NextPart_000_0039_01D25BAB.7C4A8740 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Martin The tricky part is matching/resonating the antenna. The signal is easy = to generate and amplify thereafter expertise is required g3kev From: DK7FC=20 Sent: Wednesday, December 21, 2016 1:13 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: ULF experiment: A MEchanical Based Antenna For a given antenna with its given antenna capacity and radiation = resistance you will need a certain antenna current to radiate a certain = power. To achieve this antenna current you will need to apply a high = voltage, depending on the frequency and antenna capacity. You can = generate this voltage in different ways.=20 My antenna capacity is in the order of 500 pF, which is relatively much, = relative to average amateur antennas. At 2970 Hz, i have to apply 11 kV = to get 100 mA and 1.2 uW ERP. Now, generating 11 kV (and more!) on 2970 Hz is far from easy. Your = transformer or coil or what ever arrangement has to withstand that = voltage. Ferrites tend to saturate at such low frequencies and mains = transformers are to lossy at this frequency, also their secondary = winding does not hold the combination of high voltage and 100 mA (and = more! :-) ). 73, Stefan Am 21.12.2016 13:42, schrieb Martin Evans:=20 Forgive me for asking what may be quite obvious to many - but does = this mean that if I spun a magnet at 8000rpm then I would generate a = 8kHz radio signal, identical in every way to an 8kHz signal generated in = a more conventional manner? If so, it sounds a lot easier than winding all that wire.....until the = magnet flew apart anyway! Martin GW3UCJ Swansea. ever heard of a "A MEchanical Based Antenna=E2=80=8B" ? Me neither until today ;-) 73, Rik ON7YD - OR7T=20 ------=_NextPart_000_0039_01D25BAB.7C4A8740 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Martin
The tricky part is matching/resonating the antenna. The signal is = easy to=20 generate and amplify thereafter expertise is required
 
g3kev
 
 
From: DK7FC
Sent: Wednesday, December 21, 2016 1:13 PM
Subject: Re: LF: ULF experiment: A MEchanical Based=20 Antenna
 
For=20 a given antenna with its given antenna capacity and radiation resistance = you=20 will need a certain antenna current to radiate a certain power. To = achieve this=20 antenna current you will need to apply a high voltage, depending on the=20 frequency and antenna capacity. You can generate this voltage in = different ways.=20
My antenna capacity is in the order of 500 pF, which is relatively = much,=20 relative to average amateur antennas. At 2970 Hz, i have to apply 11 kV = to get=20 100 mA and 1.2 uW ERP.

Now, generating 11 kV (and more!) on 2970 = Hz is=20 far from easy. Your transformer or coil or what ever arrangement has to=20 withstand that voltage. Ferrites tend to saturate at such low = frequencies and=20 mains transformers are to lossy at this frequency, also their secondary = winding=20 does not hold the combination of high voltage and 100 mA (and more! :-)=20 ).

73, Stefan

Am 21.12.2016 13:42, schrieb Martin Evans:=20

 

Forgive me for asking what may be quite = obvious to=20 many - but does this mean that if I spun a magnet at 8000rpm then I = would=20 generate a 8kHz radio signal, identical in every way to an 8kHz signal = generated in a more conventional manner?

If so, it sounds a lot = easier=20 than winding all that wire.....until the magnet flew apart=20 anyway!

Martin  GW3UCJ  Swansea.

 

ever heard of a "A MEchanical = Based=20 Antenna=E2=80=8B" ?

Me neither until today = ;-)

73, Rik  ON7YD - OR7T=20



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