Return-Path: Received: (qmail 50312 invoked from network); 4 Apr 2005 18:45:04 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore04.plus.net with SMTP; 4 Apr 2005 18:45:04 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DIWaJ-000Av5-3q for dave@picks.force9.co.uk; Mon, 04 Apr 2005 19:46:03 +0100 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DIWaI-000Aum-I2 for dave@picks.force9.co.uk; Mon, 04 Apr 2005 19:46:02 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1DIWcE-0001q5-V9 for dave@picks.force9.co.uk; Mon, 04 Apr 2005 19:48:03 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DIWZ1-0005fs-2r for rs_out_1@blacksheep.org; Mon, 04 Apr 2005 19:44:43 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DIWZ0-0005fj-MA for rsgb_lf_group@blacksheep.org; Mon, 04 Apr 2005 19:44:42 +0100 Received: from amsfep14-int.chello.nl ([213.46.243.21]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DIWYz-0004Vu-8J for rsgb_lf_group@blacksheep.org; Mon, 04 Apr 2005 19:44:42 +0100 Received: from MARLEEN ([80.56.172.156]) by amsfep14-int.chello.nl (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with SMTP id <20050404184431.YIUK2285.amsfep14-int.chello.nl@MARLEEN> for ; Mon, 4 Apr 2005 20:44:31 +0200 Message-ID: <004c01c53946$584136d0$9cac3850@MARLEEN> From: "PA0WFO" To: rsgb_lf_group@blacksheep.org Date: Mon, 4 Apr 2005 20:44:33 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-SPF-Result: relay.thorcom.net: 213.46.243.21 is neither permitted nor denied by domain of chello.nl X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=failed,HTML_50_60=0.095,HTML_MESSAGE=0.001 Subject: LF: Fw: TX cores / current sensors Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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 X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit
 
----- Original Message -----
From: William Oorschot
To: rsgb_lf_group@blacksheep.org
Sent: Monday, April 04, 2005 2:01 PM
Subject: TX cores / current sensors

To the members on the LF group ,
As I am trying to draw the circuit diagram of a recently bought Ropex "The First " transmitter I found the following interesting detail . The output current of the TX is passing 3 paralelled 1 Ohm resistors to the  antenna-relay , the voltage developped over this resistance is coupled to the input of a optocoupler IC which is connected to the protection circuit . As optocouplers are normally well insulated at least a few Kv this idea must be suitable for lots of applications .
As a new member of the group I wish to join you and have as much pleasure from it as my radiofriend Dick PA0SE who fixed my attention on your group .
73,William PA0WFO ( hope to work you in the near future )