Return-Path: X-Spam-DCC: paranoid 1356; 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 u44GZF5i023102 for ; Wed, 4 May 2016 18:35:15 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1axzcJ-0007Oc-Gf for rs_out_1@blacksheep.org; Wed, 04 May 2016 17:25:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1axzcE-0007OT-DJ for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 17:25:34 +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 1axzcC-0006t7-3D for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 17:25:33 +0100 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 7146D128140.A089A X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-1.cc.kuleuven.be (icts-p-smtps-1e.kulnet.kuleuven.be [134.58.240.33]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 7146D128140 for ; Wed, 4 May 2016 18:25:28 +0200 (CEST) Received: from ICTS-S-EXMBX25.luna.kuleuven.be (icts-s-exmbx25.luna.kuleuven.be [10.112.11.60]) (using TLSv1.2 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by icts-p-smtps-1.cc.kuleuven.be (Postfix) with ESMTPS id 6E101403B for ; Wed, 4 May 2016 18:25:28 +0200 (CEST) Received: from ICTS-S-EXMBX27.luna.kuleuven.be (10.112.11.62) by ICTS-S-EXMBX25.luna.kuleuven.be (10.112.11.60) with Microsoft SMTP Server (TLS) id 15.0.1156.6; Wed, 4 May 2016 18:25:28 +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 18:25:28 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: Re: Vintage RF current meter Thread-Index: AdGl4YELFbRcefdMQg6C6JvJCQiWdwAAsa8TAAR+SAAACPQFoAAB1Vga Date: Wed, 4 May 2016 16:25:28 +0000 Message-ID: <1462379126598.99338@fys.kuleuven.be> References: <5729F5EC.70302@posteo.de>,<579355A36AEE9D4FA555C45D556003AB53BA31C5@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB53BA31C5@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: 0b0eeb0b31b0fa270890b9e167cbd6d9 Subject: Re: LF: Re: Vintage RF current meter Content-Type: multipart/alternative; boundary="_000_146237912659899338fyskuleuvenbe_" 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: 7995 --_000_146237912659899338fyskuleuvenbe_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Luis, a single transformer, as suggested by Alan, will do the job. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org namens VIGILANT Luis Fern=E1ndez Verzonden: woensdag 4 mei 2016 17:37 Aan: rsgb_lf_group@blacksheep.org Onderwerp: RE: LF: Re: Vintage RF current meter Thank you for the comments Rik, Alan, Stefan The idea of external transformers seems better than digging inside this ven= erable instrument. And permits an easy two scale configuration If a single transformer can do, will mean less looses. Right ? Will open it and make some pictures to show you anyway Stefan. Don't blame me if I call you .....Lord of Rings :-))))) Hope it really help you to run more current on your wire. But beware of the= power of the ring ;-) 73 de Luis EA5DOM ________________________________ De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blackshe= ep.org] En nombre de DK7FC Enviado el: mi=E9rcoles, 04 de mayo de 2016 15:15 Para: rsgb_lf_group@blacksheep.org Asunto: Re: LF: Re: Vintage RF current meter Hi Rik, A nice drawing, remindes me to the early times of the internet and before ;= -) As Alan suggested, what about a single core working as a current transforme= r? BTW ferrite cores, i have got my package a few minutes ago 100x 3C85 cores = for VLF. The show can go on! See https://dl.dropboxusercontent.com/u/198820= 28/VLF/20160504_144923.jpg Looks like goodies ;-) 73, Stefan Am 04.05.2016 11:24, schrieb Rik Strobbe: 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_146237912659899338fyskuleuvenbe_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Luis,

 

a single transformer, as suggested by Alan, will do the job.

 

73, Rik  ON7YD - OR7T

 

Van: owner-rsgb_lf_group@= blacksheep.org <owner-rsgb_lf_group@blacksheep.org> namens VIGILANT L= uis Fern=E1ndez <luis@vigilant.es>
Verzonden: woensdag 4 mei 2016 17:37
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: RE: LF: Re: Vintage RF current meter
 
Thank you for the comments Rik, A= lan, Stefan
 
The idea of external transformers= seems better than digging inside this venerable instrument. And permits an= easy two scale configuration
If a single transformer can do, w= ill mean less looses. Right ?
&= nbsp;
Will open it and make some pictur= es to show you anyway
 
Stefan. Don't blame me if I call = you .....Lord of Rings  :-)))))
 
Hope it really help you to r= un more current on your wire. But beware of the power of the ring ;-)
 
73 de Luis
EA5DOM

De: owner-rsgb_lf_group@blacksheep.= org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: mi=E9rcoles, 04 de mayo de 2016 15:15
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: Re: Vintage RF current meter

Hi Rik,

A nice drawing, remindes me to the early times of the internet and before ;= -)

As Alan suggested, what about a single core working as a current transforme= r?

BTW ferrite cores, i have got my package a few minutes ago 100x 3C85 cores = for VLF. The show can go on! See https://dl.dropboxusercontent.com/u/19882028/VLF/20160504_144923.jpg Lo= oks like goodies ;-)

73, Stefan

Am 04.05.2016 11:24, schrieb Rik Strobbe:

Hello Lu= is,

 

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

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

- second= transformer low side to the other end of the meter and high side to the an= tenna

Drawback= : the transformers will introduce some additional loss

 

  -= ----            = ;      -----

 &n= bsp;     }|    Meter   &n= bsp; |{

 &n= bsp;     }|     +--+ &= nbsp;   |{       

TX =     }| ----|  |---- |{    &nbs= p;  Antenna

 &n= bsp;     }|{    +--+  =   }|{

 &n= bsp;-----   ------------   -----

&= nbsp;

73, Rik&= nbsp; ON7YD - OR7T

&= nbsp;

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

&= nbsp;

--_000_146237912659899338fyskuleuvenbe_--