Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,HTML_MESSAGE,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u449SRrH022063 for ; Wed, 4 May 2016 11:28:27 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1axt2k-0006VU-6O for rs_out_1@blacksheep.org; Wed, 04 May 2016 10:24:30 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1axt2i-0006VL-Ba for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 10:24:28 +0100 Received: from rhcavuit02.kulnet.kuleuven.be ([2a02:2c40:0:c0::25:130] helo=cavuit02.kulnet.kuleuven.be) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1axt2g-0005U1-GJ for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 10:24:27 +0100 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 03BC2128351.AE22B 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 cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 03BC2128351 for ; Wed, 4 May 2016 11:24:12 +0200 (CEST) Received: from ICTS-S-EXMBX17.luna.kuleuven.be (icts-s-exmbx17.luna.kuleuven.be [10.112.11.48]) (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 2066F2009A for ; Wed, 4 May 2016 11:24:07 +0200 (CEST) Received: from ICTS-S-EXMBX27.luna.kuleuven.be (10.112.11.62) by ICTS-S-EXMBX17.luna.kuleuven.be (10.112.11.48) with Microsoft SMTP Server (TLS) id 15.0.1156.6; Wed, 4 May 2016 11:24:06 +0200 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%34]) with mapi id 15.00.1156.000; Wed, 4 May 2016 11:24:07 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Thread-Topic: Vintage RF current meter Thread-Index: AdGl4YELFbRcefdMQg6C6JvJCQiWdwAAsa8T Date: Wed, 4 May 2016 09:24:07 +0000 Message-ID: <1462353848929.3842@fys.kuleuven.be> References: <579355A36AEE9D4FA555C45D556003AB53B9701E@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB53B9701E@servigilant.vigilant.local> 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-HELO-Warning: Remote host 2a02:2c40:0:c0::25:130 (rhcavuit02.kulnet.kuleuven.be) used invalid HELO/EHLO cavuit02.kulnet.kuleuven.be - verification failed X-Scan-Signature: cd79e98bb57cf38a756c15469b5a993e Subject: LF: Re: Vintage RF current meter Content-Type: multipart/alternative; boundary="_000_14623538489293842fyskuleuvenbe_" 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 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7990 --_000_14623538489293842fyskuleuvenbe_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Luis, one way to change the range without opening meter is to use two 4/1 radio t= ransformers: - first transformer high side to the TX, and low side to one and of the met= er - second transformer low side to the other end of the meter and high side t= o the antenna Drawback: the transformers will introduce some additional loss ----- ----- }| Meter |{ }| +--+ |{ TX }| ----| |---- |{ Antenna }|{ +--+ }|{ ----- ------------ ----- 73, Rik ON7YD - OR7T PS: drawing needs a monospace font (eg. Courier New) ________________________________ Van: owner-rsgb_lf_group@blacksheep.org namens VIGILANT Luis Fern=E1ndez Verzonden: woensdag 4 mei 2016 10:46 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: Vintage RF current meter Hi xyF Yesterday I got a nice gift from a local friend, Pascual EA5JF :-) https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/IMG_20160504_= 091006.jpg Unfortunately the current range under 1A looks unusable Still not opened to have a look. Seems to use a thermocouple. Is there any = chance to make it more sensible and usable for <1A currents ? 73 de Luis EA5DOM --_000_14623538489293842fyskuleuvenbe_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello Luis,=

 

one way to change = the range without opening meter is to use two 4/1 radio transformers:

- first transforme= r high side to the TX, and low side to one and of the meter

- second transform= er low side to the other end of the meter and high side to the antenna

Drawback: the tran= sformers will introduce some additional loss

 

  ----- =             &nb= sp;    -----

   =     }|    Meter     |{

   =     }|     +--+   = ;  |{       

TX  &nbs= p;  }| ----|  |---- |{       A= ntenna

   =     }|{    +--+   &nbs= p;}|{

  -----&= nbsp;  ------------   -----

 

73, Rik  ON7Y= D - OR7T

 

PS: drawing needs = a monospace font (eg. Courier New)

 

Van: owner-rsgb_= lf_group@blacksheep.org <owner-rsgb_lf_group@blacksheep.org> namens V= IGILANT Luis Fern=E1ndez <luis@vigilant.es>
Verzonden: woensdag 4 mei 2016 10:46
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: Vintage RF current meter
 
Hi xyF
 
Yesterday I got a nice gift from a local frie= nd, Pascual EA5JF :-)
 
 
Unfortunately the current range under 1A look= s unusable 
Still not opened to have a look. Seems to use= a thermocouple. Is there any chance to make it
more sensible and usable for <1A currents = ?
 
73 de Luis
EA5DOM
--_000_14623538489293842fyskuleuvenbe_--