Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 857E6380000BE; Thu, 25 Oct 2012 12:44:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TRQWV-000752-SO for rs_out_1@blacksheep.org; Thu, 25 Oct 2012 17:43:11 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TRQWV-00074t-EG for rsgb_lf_group@blacksheep.org; Thu, 25 Oct 2012 17:43:11 +0100 Received: from smtpout5.wanadoo.co.uk ([80.12.242.80] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TRQWT-0007E4-Mc for rsgb_lf_group@blacksheep.org; Thu, 25 Oct 2012 17:43:10 +0100 Received: from AGB ([2.26.16.105]) by mwinf5d62 with ME id FUj81k00E2G0UbE03Uj8XN; Thu, 25 Oct 2012 18:43:09 +0200 Message-ID: <648CE70A981F42D9BD696ECDCE4CBF96@AGB> From: "Graham" To: References: <4084B089A7FF496CAC1CE9A2459B9C47@AGB> <7E9EB5FA653147298EEBB4676DCDD9DD@White> <3DD7F0DC19984F7CBF611D59430EEFA3@AGB> <508912A0.5060902@iup.uni-heidelberg.de> In-Reply-To: <508912A0.5060902@iup.uni-heidelberg.de> Date: Thu, 25 Oct 2012 17:43:08 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) 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: Like you Stefan, these pioneers are pushing the limits , using heat pumps to cool the light source, the source is as small as possible to ensure good coupling .. reducing the duty cycle as in radio can be a big help ... but as I say its a tool , if anyone wants to try , it puts all the features in one box [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.80 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 0cdfd8d5ce44f1724c623c4ac9f44df6 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) Content-Type: multipart/alternative; boundary="----=_NextPart_000_0057_01CDB2D8.31D3DA20" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1d40cb50896c630fb5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0057_01CDB2D8.31D3DA20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Like you Stefan, these pioneers are pushing the limits , using = heat pumps to cool the light source, the source is as small as = possible to ensure good coupling .. reducing the duty cycle as in = radio can be a big help ... but as I say its a tool , if = anyone wants to try , it puts all the features in one box =20 G..=20 From: Stefan Sch=E4fer=20 Sent: Thursday, October 25, 2012 11:21 AM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 = KHz :) Am 25.10.2012 01:34, schrieb Graham:=20 [...] 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?=20 Yes there are some high power modules but even 10W power dissipation = should be managable for everyone. 73, Stefan/DK7FC ------=_NextPart_000_0057_01CDB2D8.31D3DA20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Like  you Stefan,  these  pioneers are  = pushing =20 the  limits  , using  heat pumps  to  cool = the =20 light  source, the  source is  as small  as possible = to  ensure  good coupling ..  reducing  the  = duty=20 cycle  as  in radio  can  be a  big  help=20 ...  but  as I say  its a  tool  , if =20 anyone  wants to  try , it  puts  all the  = features in=20 one  box 
 
G..

From: Stefan = Sch=E4fer
Sent: Thursday, October 25, 2012 11:21 AM
Subject: Re: LF: OPERA OPTICAL BEACON (way off topic) but is = based=20 on 17 KHz :)


Am 25.10.2012 01:34, schrieb Graham:=20
[...]
 
fsk  , of  course , but  simplicity is  = the =20 object  , switching the (led)  light  off  = and =20 on could   reduce the  duty  by  50% =20 where  heat is  a problem ,
[...]

Why should it be = an advantage=20 to reduce the duty cycle to 50% and where do you expect heat problems = when=20 driving a LED?

Yes there are some high power modules but even = 10W power=20 dissipation should be managable for everyone.

73,=20 Stefan/DK7FC
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