Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 791F13800009E; Thu, 25 Oct 2012 06:22:41 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TRKZA-0005ew-FG for rs_out_1@blacksheep.org; Thu, 25 Oct 2012 11:21:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TRKZA-0005en-2B for rsgb_lf_group@blacksheep.org; Thu, 25 Oct 2012 11:21:32 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TRKZ8-0005II-Ez for rsgb_lf_group@blacksheep.org; Thu, 25 Oct 2012 11:21:30 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id q9PALTE7029106 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 25 Oct 2012 12:21:29 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q9PALTIH024951 for ; Thu, 25 Oct 2012 12:21:29 +0200 Message-ID: <508912A0.5060902@iup.uni-heidelberg.de> Date: Thu, 25 Oct 2012 12:21:20 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= 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: <4084B089A7FF496CAC1CE9A2459B9C47@AGB> <7E9EB5FA653147298EEBB4676DCDD9DD@White> <3DD7F0DC19984F7CBF611D59430EEFA3@AGB> In-Reply-To: X-Spam-Score: -3.0 (---) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Am 25.10.2012 01:34, schrieb Graham: > [...] > fsk , of course , but simplicity is the object , switching > the (led) light off and on could reduce the duty by 50% > where heat is a problem , > [...] [...] Content analysis details: (-3.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 7ab87d4d3ea1d9dcb73a78e83fe4d608 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) Content-Type: multipart/alternative; boundary="------------030002000904040508000209" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: 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-aol-global-disposition: G x-aol-sid: 3039ac1d604b508912f04163 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------030002000904040508000209 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Am 25.10.2012 01:34, schrieb Graham: > [...] > fsk , of course , but simplicity is the object , switching > the (led) light off and on could reduce the duty by 50% > where heat is a problem , > [...] Why should it be an advantage to reduce the duty cycle to 50% and where do you expect heat problems when driving a LED? Yes there are some high power modules but even 10W power dissipation should be managable for everyone. 73, Stefan/DK7FC --------------030002000904040508000209 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Am 25.10.2012 01:34, schrieb Graham:
[...]
 
fsk  , of  course , but  simplicity is  the  object  , switching the (led)  light  off  and  on could   reduce the  duty  by  50%  where  heat is  a problem ,
[...]

Why should it be an advantage to reduce the duty cycle to 50% and where do you expect heat problems when driving a LED?

Yes there are some high power modules but even 10W power dissipation should be managable for everyone.

73, Stefan/DK7FC
--------------030002000904040508000209--