Return-Path: Received: (qmail 43069 invoked from network); 4 Apr 2005 19:31:12 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 4 Apr 2005 19:31:12 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DIXIx-000JIy-K6 for dave@picks.force9.co.uk; Mon, 04 Apr 2005 20:32:11 +0100 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DIXIx-000JIv-HR for dave@picks.force9.co.uk; Mon, 04 Apr 2005 20:32:11 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1DIXKt-0002BN-ND for dave@picks.force9.co.uk; Mon, 04 Apr 2005 20:34:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DIXHv-0005wT-7x for rs_out_1@blacksheep.org; Mon, 04 Apr 2005 20:31:07 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DIXHu-0005wJ-Or for rsgb_lf_group@blacksheep.org; Mon, 04 Apr 2005 20:31:06 +0100 Received: from fh1023.dia.cp.net ([64.97.168.33] helo=n066.sc1.cp.net) by relay.thorcom.net with esmtp (Exim 4.43) id 1DIXHs-0004jq-0Z for rsgb_lf_group@blacksheep.org; Mon, 04 Apr 2005 20:31:06 +0100 Received: from l8p8y6 (62.252.234.42) by n066.sc1.cp.net (7.0.043) id 42437A00001BCF1E for rsgb_lf_group@blacksheep.org; Mon, 4 Apr 2005 19:30:53 +0000 Message-ID: <001a01c5394c$dd4aed20$2aeafc3e@l8p8y6> From: "hamilton mal" To: rsgb_lf_group@blacksheep.org References: <004c01c53946$584136d0$9cac3850@MARLEEN> Date: Mon, 4 Apr 2005 20:27:36 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4807.1700 X-SPF-Result: relay.thorcom.net: 64.97.168.33 is neither permitted nor denied by domain of virgin.net X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=failed,HTML_50_60=0.095,HTML_MESSAGE=0.001 Subject: LF: Re: 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: PA0WFO
To: rsgb_lf_group@blacksheep.org
Sent: Monday, April 04, 2005 7:44 PM
Subject: LF: Fw: TX cores / current sensors

 
----- 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 )
 
A couple of bits of info that I have concerning the above Ropex TX.
The Pa Fets are IRF1010N, the drive is a SG3525 device and the xtal is 6.5536 khz.
If u get the cct sorted out I could do with a copy. I do have a ROPEX although I have never really used it except for testing out hi, but it would be useful as an emergency TX.
One other thing, it will not load into a grounded loading coil on High PWR and to overcome this problem use a LPF and then it works FB.
73 De Mal/G3KEV