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 w9N1meEb001586 for ; Tue, 23 Oct 2018 03:48:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gElj0-0000gW-IG for rs_out_1@blacksheep.org; Tue, 23 Oct 2018 02:43:14 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gEliq-0000gN-Sf for rsgb_lf_group@blacksheep.org; Tue, 23 Oct 2018 02:43:04 +0100 Received: from conuserg-09.nifty.com ([210.131.2.76]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gElil-0000t7-KI for rsgb_lf_group@blacksheep.org; Tue, 23 Oct 2018 02:43:03 +0100 Received: from HidehoDell (g219-100-239-008.scn-net.ne.jp [219.100.239.8]) (authenticated) by conuserg-09.nifty.com with ESMTP id w9N1gSeM008523 for ; Tue, 23 Oct 2018 10:42:28 +0900 X-DKIM-Result: Domain=nifty.com Result=Signature OK DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-09.nifty.com w9N1gSeM008523 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1540258948; bh=F9Da77HNBAzWfy++qV31hkTBhCVqUYtEDLzRqGqN1fQ=; h=From:To:References:In-Reply-To:Subject:Date:From; b=BlKhTnkKlNtpcFr6s94L6kfaoQa3wmbGpW13X9cpUOvYQEHoJiVIgGfPyTK/p/4Bs u/S+F17HCxZ+ypDKxFpt+7Br0jNxlmq2Mt6AuNPWGi2FgO5iwldTJcs3iY0uJShJrr OY2v3SLbPI7tFnTOhDbIUtExSrxn9psXOB05goRvcAkhFEpUN8gGZ/DrnpdgMV+YQE nbNy4bMQ3tPoJVdhOeo/pAdumw91PmMG5YZ4r/fvF/o3UNHW726em6yTi/wb1VrCow v8/B2KMpNL1JB8+zNtVWgZ7IfDtIwUUSZ1f6VxXTx+WLxMeJl7zdeU4f8sGTfMya0Q YLdtHF/udYz/w== X-Nifty-SrcIP: [219.100.239.8] From: "Hideho YAMAMURA" To: References: <5BCC66BE.8030109@posteo.de> <5BCDCAD5.707@posteo.de> <42471ae2-a85b-84d7-83b1-abbacc085387@orange.fr> In-Reply-To: <42471ae2-a85b-84d7-83b1-abbacc085387@orange.fr> Date: Tue, 23 Oct 2018 10:42:25 +0900 Message-ID: <009601d46a71$a6b0a470$f411ed50$@nifty.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGwRLTAa61d8lKR3n3ukFcgT3PCRQMI8f+lAyVi6NalQt1H4A== Content-Language: ja 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 @@CONTACT_ADDRESS@@ for details. Content preview: Stephan and all, You might be interested in the following, although not Rogowski type, a cut toroidal core, clamp-type, current transformer + rectifier. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [210.131.2.76 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record 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: 479f887a0af49374011bd47f9dfa3263 Subject: RE: LF: Rogowski-coils for RF measurements Content-Type: multipart/alternative; boundary="----=_NextPart_000_0097_01D46ABD.169D0760" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=1.0 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_60_70, 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 This is a multipart message in MIME format. ------=_NextPart_000_0097_01D46ABD.169D0760 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stephan and all, =20 You might be interested in the following, although not Rogowski type, a cut toroidal core, clamp-type, current transformer + rectifier. You need a high-impedance voltmeter. A normal handy one will do. You obtain absolute values, accuracy +-20% (or better). =20 I developed the HF version in circa 2002, and the LF version in 2011. Distributed as kit and finished version, sold about 4000. =20 Fun to observe RF currents on coax-shield, rotator-cable, AC-cables, VHF coax while transmitting at HF, LF..., Probably too small to measure towers: inner-diameter is about 22mm. =20 websites in Japanese, sorry, but see the pictures. =20 HF: https://www.ddd-daishin.co.jp/e-kousaku/d-rf-current/ver2/index.htm 1.8-54MHz, 10mA-300mA, (accuracy +-20%) 10:1 (1000mV is 100mA) =20 LF: https://www.ddd-daishin.co.jp/e-kousaku/d-rf-current/ver2/lf/lf-part-set.= htm 135kHz-4MHz, 0.05-2A, (accuracy +-20% ) 1:1 (1V is 1A) =20 Hideho YAMAMURA, Ph.D, JF1DMQ =20 =20 From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of F6CWN Sent: Tuesday, October 23, 2018 12:01 AM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Rogowski-coils for RF measurements =20 Hello Stephane! Maybe this could help you: http://www.uqac.ca/dsa/archives/projets/2010/conception/rapportFinal/RapF= ina l_2010-193.pdf (Limited to ~300 KHz) 73: Jeff F6CWN =20 Le 22/10/2018 =E0 13:04, DK7FC a =E9crit : Hi all,=20 Has someone ever build (homemade, not bought!) a Rogowski-coil for RF current measurements?=20 https://en.wikipedia.org/wiki/Rogowski_coil=20 It could be used to measure leakage currents in a tower near the antenna wire for example. Or for measuring RF currents into a pole of a guide = rail, for example :-)=20 I'm planning to build one and i thought i use 0.4 mm diameter enameled = cu wire arround a graden hose, having 0.6m circumference. Then some = shrinking tube will be applied. That's the plan.=20 The circuit looks easy, it should be run from a 9V battery and a simple TL081 for example. The output could be adapted to a multimeter, so there = is a digital read-out.=20 I'm curious to see how it works...=20 73, Stefan=20 ------=_NextPart_000_0097_01D46ABD.169D0760 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Stephan and all,

 

You might be interested in the following, = although not Rogowski type,

a cut toroidal core, clamp-type, current = transformer + rectifier.

You need a high-impedance voltmeter. A = normal handy one will do.

You obtain absolute values, accuracy +-20% = (or better).

 

I developed the HF version in circa 2002, = and the LF version in 2011.

Distributed as kit and finished version, = sold about 4000.

 

Fun to observe RF currents on coax-shield, = rotator-cable, AC-cables,

VHF coax while transmitting at HF, = LF...,

Probably too small to measure towers: = inner-diameter is about 22mm.

 

websites in Japanese, sorry, but see the = pictures.

 

HF:

https://www.ddd-daishin.co.jp/e-kousaku/d-rf-current/ver2/index.htm

1.8-54MHz, 10mA-300mA, (accuracy = +-20%)

10:1 =A0(1000mV is = 100mA)

 

LF:

https://www.ddd-daishin.co.jp/e-kousaku/d-rf-current/ver2/lf= /lf-part-set.htm

135kHz-4MHz, 0.05-2A, (accuracy +-20% = )

1:1 =A0(1V is 1A)

 

Hi= deho YAMAMURA, Ph.D, JF1DMQ

 

 

From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of = F6CWN
Sent: Tuesday, October 23, 2018 12:01 = AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: = Rogowski-coils for RF measurements

 


Hello Stephane!


Maybe this could help you:

http://www.uqac.ca/dsa/archives/projets/2010/c= onception/rapportFinal/RapFinal_2010-193.pdf

(Limited to ~300 = KHz)

73: Jeff F6CWN

 

Le 22/10/2018 =E0 13:04, DK7FC a = =E9crit :

Hi all,

Has = someone ever build (homemade, not bought!) a Rogowski-coil for RF = current measurements?
https://en.wikipedia= .org/wiki/Rogowski_coil

It could be used to measure leakage = currents in a tower near the antenna wire for example. Or for measuring = RF currents into a pole of a guide rail, for example :-)

I'm = planning to build one and i thought i use 0.4 mm diameter enameled cu = wire arround a graden hose, having 0.6m circumference. Then some = shrinking tube will be applied. That's the plan.

The circuit = looks easy, it should be run from a 9V battery and a simple TL081 for = example. The output could be adapted to a multimeter, so there is a = digital read-out.

I'm curious to see how it works... =


73, Stefan =

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