Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de05.r1000.mx.aol.com (Internet Inbound) with ESMTP id E7D89380000A3; Mon, 10 Oct 2011 01:21:03 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RD8HF-00028L-6J for rs_out_1@blacksheep.org; Mon, 10 Oct 2011 06:19:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RD8HE-00028C-HM for rsgb_lf_group@blacksheep.org; Mon, 10 Oct 2011 06:19:48 +0100 Received: from smtp-out12.han.skanova.net ([195.67.226.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RD8HB-00061X-HU for rsgb_lf_group@blacksheep.org; Mon, 10 Oct 2011 06:19:48 +0100 Received: from [127.0.0.1] (62.20.250.30) by smtp-out12.han.skanova.net (8.5.133) (authenticated as u33233109) id 4E79D83A00521091 for rsgb_lf_group@blacksheep.org; Mon, 10 Oct 2011 07:19:38 +0200 Message-ID: <4E92806A.5020106@telia.com> Date: Mon, 10 Oct 2011 07:19:38 +0200 From: "Johan H. Bodin" User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4E9083DB.5090603@iup.uni-heidelberg.de> <4E909FCE.7060302@telus.net> <4E90A3F1.8080004@iup.uni-heidelberg.de> In-Reply-To: <4E90A3F1.8080004@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Laser link... Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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-SCOLL-SCORE: 0:2:460728800:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40cd4e9280bf3ad9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Stefan, Clint Turner http://ka7oei.com/ has interesting information on his "optical communications page" http://modulatedlight.org/optical_comms/optical_index.html. Linear's design note DN399 about photodiode amplifiers may also be worth reading http://cds.linear.com/docs/Design%20Note/dn399f.pdf (it uses a BF862 FET which I think is already one of your favourites). Oops... 650nm wavelength is perhaps O.T. on this reflector. 73 Johan SM6LKM