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 w2L9dFDT029944 for ; Wed, 21 Mar 2018 10:39:18 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eya5Q-0007OA-E3 for rs_out_1@blacksheep.org; Wed, 21 Mar 2018 09:31:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eya5P-0007O1-Le for rsgb_lf_group@blacksheep.org; Wed, 21 Mar 2018 09:31:11 +0000 Received: from rhcavuit01.kulnet.kuleuven.be ([2a02:2c40:0:c0::25:129]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eya5J-0002le-F2 for rsgb_lf_group@blacksheep.org; Wed, 21 Mar 2018 09:31:10 +0000 X-KULeuven-Envelope-From: rik.strobbe@kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 2404812033C.A422A X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-2.cc.kuleuven.be (icts-p-smtps-2e.kulnet.kuleuven.be [134.58.240.34]) by rhcavuit01.kulnet.kuleuven.be (Postfix) with ESMTP id 2404812033C for ; Wed, 21 Mar 2018 10:30:56 +0100 (CET) Received: from ICTS-S-EXMBX23.luna.kuleuven.be (icts-s-exmbx23.luna.kuleuven.be [10.112.11.58]) (using TLSv1.2 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by icts-p-smtps-2.cc.kuleuven.be (Postfix) with ESMTPS id 1A90B2003B; Wed, 21 Mar 2018 10:30:56 +0100 (CET) Received: from ICTS-S-EXMBX27.luna.kuleuven.be (10.112.11.62) by ICTS-S-EXMBX23.luna.kuleuven.be (10.112.11.58) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Wed, 21 Mar 2018 10:30:55 +0100 Received: from ICTS-S-EXMBX27.luna.kuleuven.be ([fe80::291a:cc4f:6953:698a]) by ICTS-S-EXMBX27.luna.kuleuven.be ([fe80::291a:cc4f:6953:698a%25]) with mapi id 15.00.1320.000; Wed, 21 Mar 2018 10:30:56 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: LineOne , "rsgb_lf_group@yahoogroups.co.uk" Thread-Topic: [rsgb_lf_group] Idea for tuned inductor Thread-Index: AQHTwPYjPZpBxq7sTEaXau97tu+yVqPabI4S Date: Wed, 21 Mar 2018 09:30:56 +0000 Message-ID: <1521624654720.99564@kuleuven.be> References: In-Reply-To: Accept-Language: nl-BE, en-GB, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.112.50.1] MIME-Version: 1.0 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: Hello Andy, do you mean something like this: http://www.wireless.org.uk/dk5pt-f.htm? ? 73, Rik ON7YD - OR7T [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_FONT_LOW_CONTRAST BODY: HTML font color similar or identical to background 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 4c68a2de3e8889496b681f3e16d4f49a Subject: LF: Re: [rsgb_lf_group] Idea for tuned inductor Content-Type: multipart/alternative; boundary="_000_152162465472099564kuleuvenbe_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.1 required=5.0 tests=HTML_70_80,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,HTML_WEB_BUGS,PORN_4 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 --_000_152162465472099564kuleuvenbe_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Andy, do you mean something like this: http://www.wireless.org.uk/dk5pt-f.htm? ? 73, Rik ON7YD - OR7T ________________________________ Van: rsgb_lf_group@yahoogroups.co.uk name= ns Andy Talbot andy.g4jnt@gmail.com [rsgb_lf_group] Verzonden: woensdag 21 maart 2018 10:22 Aan: rsgb_lf_group; LineOne Onderwerp: [rsgb_lf_group] 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 __._,_.___ ________________________________ Posted by: Andy Talbot ________________________________ Reply via web post * Reply = to sender * Reply to group * Start a new= topic * = Messages in this topic (1) Visit Your Group [Yahoo! Groups] * Privacy * Un= subscribe * Terms of Use . __,_._,___ --_000_152162465472099564kuleuvenbe_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello Andy,


do you mean something like this: http://www.wireless.org.uk/dk5pt-f.htm​ ?


73, Rik  ON7YD - OR7T


Van: rsgb_lf_group@yahoogro= ups.co.uk <rsgb_lf_group@yahoogroups.co.uk> namens Andy Talbot andy.g= 4jnt@gmail.com [rsgb_lf_group] <rsgb_lf_group@yahoogroups.co.uk>
Verzonden: woensdag 21 maart 2018 10:22
Aan: rsgb_lf_group; LineOne
Onderwerp: [rsgb_lf_group] Idea for tuned inductor
 
 

Looking at some large pot cores , I was struck by this nov= el 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 allow= ed precise adjustment 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, doing it this = way means you have a gap in outer and inner pieces, so the effective gap is= double the measured value

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

You'd have to watch out for saturation (V=3D 4.44 . N.A.B) but as a sm= all adjuster to a larger fixed loading coil at low frequencies,  may h= ave some merit for fine repeatable setting

Just a thought

Andy  G4JNT

__._,_.___
Posted by: Andy Talbot <andy.g4jnt@gmail.com>
Reply via web post • Reply to sender • Reply to gr= oup • Start a new topic • Mes= sages in this topic (1)

.

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