Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8935438000127; Mon, 10 Oct 2011 15:13:07 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RDLFy-0007Wv-GD for rs_out_1@blacksheep.org; Mon, 10 Oct 2011 20:11:22 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RDLFu-0007Wm-4J for rsgb_lf_group@blacksheep.org; Mon, 10 Oct 2011 20:11:18 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RDLFr-0005Ux-Fa for rsgb_lf_group@blacksheep.org; Mon, 10 Oct 2011 20:11:17 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id p9AJBEM6029890 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 10 Oct 2011 21:11:14 +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 p9AJBEDN026677 for ; Mon, 10 Oct 2011 21:11:14 +0200 Message-ID: <4E934325.9010801@iup.uni-heidelberg.de> Date: Mon, 10 Oct 2011 21:10:29 +0200 From: =?ISO-8859-15?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: <4E9083DB.5090603@iup.uni-heidelberg.de> <4E909FCE.7060302@telus.net> <4E90A3F1.8080004@iup.uni-heidelberg.de> <4E92806A.5020106@telia.com> <003f01cc874f$176bd210$0401a8c0@xphd97xgq27nyf> In-Reply-To: <003f01cc874f$176bd210$0401a8c0@xphd97xgq27nyf> 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; format=flowed 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: 0:2:478290624:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d404d4e9343c23cae X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Am 10.10.2011 15:18, schrieb mal hamilton: > [...] > Concentrate instead on proper LF Antennas, Sensitive receivers and plenty of > RF,[...] > Good idea, never done that before. I really should think about finally getting rid of that QRP signal and work to get a decent signal... 73, Stefan/DK7FC > ----- Original Message ----- > From: "Johan H. Bodin" > To: > Sent: Monday, October 10, 2011 5:19 AM > Subject: Re: LF: Laser link... > > > >> 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 >> >> >> >