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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,RATWARE_GECKO_BUILD,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 u44DK1jl022477 for ; Wed, 4 May 2016 15:20:01 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1axweK-000722-Qg for rs_out_1@blacksheep.org; Wed, 04 May 2016 14:15:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1axweK-00071t-8x for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 14:15:32 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1axweG-0006BP-4G for rsgb_lf_group@blacksheep.org; Wed, 04 May 2016 14:15:31 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 3615F20464 for ; Wed, 4 May 2016 15:15:25 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3r0JSF08yfz5vNG for ; Wed, 4 May 2016 15:15:24 +0200 (CEST) Message-ID: <5729F5EC.70302@posteo.de> Date: Wed, 04 May 2016 15:15:24 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <579355A36AEE9D4FA555C45D556003AB53B9701E@servigilant.vigilant.local> <1462353848929.3842@fys.kuleuven.be> In-Reply-To: <1462353848929.3842@fys.kuleuven.be> X-Scan-Signature: 64bc660a83b79b15f4c44d2b2147e02d Subject: Re: LF: Re: Vintage RF current meter Content-Type: multipart/alternative; boundary="------------060103050503020802020006" 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: 7993 This is a multi-part message in MIME format. --------------060103050503020802020006 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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 transformer? 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 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 transformers: > > - 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 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 Fernández > > *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 --------------060103050503020802020006 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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 transformer?

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 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 transformers:

- 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 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 <owner-rsgb_lf_group@blacksheep.org> namens VIGILANT Luis Fernández <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 friend, 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
--------------060103050503020802020006--