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 w2LAaJ2p030131 for ; Wed, 21 Mar 2018 11:36:22 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eyb0b-00089n-0v for rs_out_1@blacksheep.org; Wed, 21 Mar 2018 10:30:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eyb0a-00089e-HG for rsgb_lf_group@blacksheep.org; Wed, 21 Mar 2018 10:30:16 +0000 Received: from mout.gmx.net ([212.227.17.20]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eyb0T-0003C5-HJ for rsgb_lf_group@blacksheep.org; Wed, 21 Mar 2018 10:30:15 +0000 Received: from df2jpPC ([87.161.204.175]) by mail.gmx.com (mrgmx101 [212.227.17.168]) with ESMTPSA (Nemesis) id 0MWgND-1f4wwG3H1H-00Xw88 for ; Wed, 21 Mar 2018 11:30:07 +0100 From: "Joe" To: References: In-Reply-To: Date: Wed, 21 Mar 2018 11:30:07 +0100 Message-ID: <01b401d3c0ff$95520410$bff60c30$@gmx.de> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQIgPlocNxyVCkaC4OTB7GeDz5HVhKNBgeog Content-Language: de X-Antivirus: AVG (VPS 180320-2, 20.03.2018), Outbound message X-Antivirus-Status: Clean X-Provags-ID: V03:K0:er6NmzOsLzhGGCoCIzwsddM2U6DCsAVIQogfLd7PY0Ul78FsR/8 PROkhfLZm6XCKDjGqeilJGHH6ONCWRrbOvKXM1PlNj/XHwYRnlc2r/Ge0hV/LhGORV77+qD JKYWVJAhYOJ2Jbbh9fdxX0fSSJmovKX/gG9uhrw2zS3keGPl8wYl7THyhhWIZkhUyoDiOdc hCMZPMTd5SpTDaahCLRvw== X-UI-Out-Filterresults: notjunk:1;V01:K0:0frrh3EJJxY=:Q8KrWgn0pX8JjpzvehpsM5 Kh61QShm//kEwJbyyTnRv9KTJvq+InkSD+lG1LIq4eJsLwSdMXK/0smkFEaUFzQHZ1u6uig7s 1lf5HnvWzlTUOS6QoYRWnBdKSbQbH4hW+3b6bR+Y9LLDypMDSaqebd5MhSdyiRCUX3Uyp+PNW p32pmEQwb3B194qwmh3kHZy5FnDnZFAsB1SSWO8XcaHanxOOKaKqNV0sooLv/aOr8PBEsz56I kGQxNlplJSOK21PMuPW9K2EmhGzUe3gXnMN8yJUQDhHpIvOIrOBVw0Omw5vr/OXT95lgL3FVt 9f95ynbl84CM8Dtw0y7ARB1hpnbpMkTr0CSM/YUpsIqjo+Ti+8UhitfWPRG9kNFS4Hfd8Koxy rRiQb8V6LODiDw3HFUzLek3YiMdDTgaD12RT6PF5fneGdg02Ee0eQ+xDFvcBlYP+2+JEWZU2n kPtxq/ag81qBGF64Au7ZefdsOdsCbJkyeBOYraLE8Qrg4tkq2McMwWLzKjYqNumwmiyujTqBK Gc03d6c47FkYRq2ThW67YytblEpdHvYdG93cUW6ITQg1VmtZLY2fhvWZSMcAf46kzY+kiJGhu 9ZIwb1+EKF8GXCr8LXvShEc3+dyCBCw2RmsiloQCkBvlxwhUhP/JtC6kFeyzVVO8hRcrn/NDU 69tv5rdU7RM+oRLf6cRRF6TJa4L0ByLOReqnU5UV+JnFdCG9ELV5K7MdzPZkTz+qtkczeS17q jxsycQx0jDUle5P+CqxiVcRvwazTeaviK3s0cm/sUy5jR2lBnIQUWoT1J9VZbGSZoxicrmbvb nyF66sMx4SUMaiX/LEdal9kRDAovk+7YSFnIbsIyACnf8gZJ88= 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. 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Content preview: Hi Andy, I did it this way: http://www.df2jp.dxx.eu/Variometer.html [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (df2jp[at]gmx.de) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_REMOTE_IMAGE Message contains an external image X-Scan-Signature: 64bc660a83b79b15f4c44d2b2147e02d Subject: LF: AW: Idea for tuned inductor Content-Type: multipart/alternative; boundary="----=_NextPart_000_01B5_01D3C107.F7172F60" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=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_01B5_01D3C107.F7172F60 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Andy, I did it this way: http://www.df2jp.dxx.eu/Variometer.html 73 Joe Von: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksh= eep.org] Im Auftrag von Andy Talbot Gesendet: Mittwoch, 21. M=C3=A4rz 2018 10:22 An: rsgb_lf_group; LineOne Betreff: LF: Idea for tuned inductor Looking at some large pot cores , I was struck by this novel idea. Back in the very early days of 10GHz with wideband equipment, we tuned Gunn= oscillator using a dielectric probe on a micrometer head - that allowed pr= ecise adjustment with a repeatable reading. Looking at my gapped pot cor= es, it occurred to me something similar could be done with them. Fix, somehow, one half core to the micrometer so it can me pulled away from= the other allowing a precise air gap. Of course, doing it this way means = you have a gap in outer and inner pieces, so the effective gap is double th= e measured value Inductance is then uo * A / g where uo is mag permaeability of free spac= e, 4E-7 * pi A is the core area and g the adjustable gap (SI units) You'd have to watch out for saturation (V=3D 4.44 . N.A.B) but as a small a= djuster to a larger fixed loading coil at low frequencies, may have some m= erit for fine repeatable setting Just a thought Andy G4JNT --- Diese E-Mail wurde von AVG auf Viren gepr=C3=BCft. http://www.avg.com ------=_NextPart_000_01B5_01D3C107.F7172F60 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Andy,

 

=

I did it this way:

 

=

http://www.df2jp.dxx.eu/Variometer.html

 

73 Joe

 

Von: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_gr= oup@blacksheep.org] Im Auftrag von Andy Talbot
Gesendet: M= ittwoch, 21. M=C3=A4rz 2018 10:22
An: rsgb_lf_group; LineOne
<= b>Betreff: LF: Idea for tuned inductor

 

Looking at some la= rge pot cores , I was struck by this novel idea.

 

Back in the ve= ry early days of 10GHz with wideband equipment, we tuned Gunn oscillator us= ing a dielectric probe on a micrometer head - that allowed precise adjustme= nt with a repeatable reading.    Looking at my gapped pot cores, = it occurred to me something similar could be done with them.

=

 

Fix, somehow, one half core to the micrometer so it can me = pulled away from the other allowing a precise air gap.  Of course, doi= ng it this way means you have a gap in outer and inner pieces, so the effec= tive gap is double the measured value

 

Inductance is= then uo * A / g    where uo is mag permaeability of free space, = 4E-7 * pi   A is the core area and g the adjustable gap  (SI= units) 

 

You'd have to watch out for saturatio= n (V=3D 4.44 . N.A.B) but as a small adjuster to a larger fixed loading coi= l at low frequencies,  may have some merit for fine repeatable setting=

 

<= div>

Just a thought

 

Andy = ; G4JNT


3D""= Virenf= rei. www.avg.com
=
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