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 u44Fh4dR022966 for ; Wed, 4 May 2016 17:43:05 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1axys3-0007F3-Sn for rs_out_1@blacksheep.org; Wed, 04 May 2016 16:37:51 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1axys3-0007Eu-8Z for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 16:37:51 +0100 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1axyrz-0006fx-9f for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 16:37:50 +0100 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Wed, 4 May 2016 17:37:25 +0200 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%13]) with mapi id 14.03.0123.003; Wed, 4 May 2016 17:37:30 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: Re: Vintage RF current meter Thread-Index: AdGl4YELFbRcefdMQg6C6JvJCQiWdwAAsa8TAAR+SAAACPQFoA== Date: Wed, 4 May 2016 15:37:28 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB53BA31C5@servigilant.vigilant.local> In-Reply-To: <5729F5EC.70302@posteo.de> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 48f9f369e416634ea68e1d2c7f17cd5d Subject: RE: LF: Re: Vintage RF current meter Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB53BA31C5servigilantvigi_" 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: 7994 --_000_579355A36AEE9D4FA555C45D556003AB53BA31C5servigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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_579355A36AEE9D4FA555C45D556003AB53BA31C5servigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
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:
<= style style=3D"DISPLAY: none" type=3D"text/css">P { MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px }

Hello Luis,<= /p>

 

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

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

- second transforme= r low side to the other end of the meter and high side to the antenna

Drawback: the trans= formers will introduce some additional loss

 

  ----- &= nbsp;           &nbs= p;    -----

   &= nbsp;   }|    Meter     |{

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

TX   = ;  }| ----|  |---- |{       An= tenna

   &= nbsp;   }|{    +--+    = ;}|{

  -----&n= bsp;  ------------   -----

 

73, Rik  ON7YD= - OR7T

 

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

 

Van: owner-rsgb_lf_group@blacksheep.org <owner-rsgb_lf_group@blacksheep.org> namens VIGILANT Luis Fern=E1= ndez <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 frien= d, Pascual EA5JF :-)
 
 
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_579355A36AEE9D4FA555C45D556003AB53BA31C5servigilantvigi_--