Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from rly-db01.mx.aol.com (rly-db01.mail.aol.com [172.19.130.76]) by air-db03.mail.aol.com (v126.13) with ESMTP id MAILINDB033-aa84b29f3b2318; Thu, 17 Dec 2009 04:02:53 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db01.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDB016-aa84b29f3b2318; Thu, 17 Dec 2009 04:02:44 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NLCCF-0000rd-Hn for rs_out_1@blacksheep.org; Thu, 17 Dec 2009 08:58:55 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NLCCF-0000rU-5N for rsgb_lf_group@blacksheep.org; Thu, 17 Dec 2009 08:58:55 +0000 Received: from fmmailgate04.web.de ([217.72.192.242]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from <horst.stoecker@web.de>) id 1NLCET-0002cA-D4 for rsgb_lf_group@blacksheep.org; Thu, 17 Dec 2009 09:01:15 +0000 Received: from web.de by fmmailgate04.web.de (Postfix) with SMTP id EEE686238910 for <rsgb_lf_group@blacksheep.org>; Thu, 17 Dec 2009 10:01:35 +0100 (CET) Received: from [88.76.49.138] by freemailng2505.web.de with HTTP; Thu, 17 Dec 2009 10:01:34 +0100 Date: Thu, 17 Dec 2009 10:01:34 +0100 Message-Id: <1542517694@web.de> MIME-Version: 1.0 From: =?iso-8859-15?Q?Horst_St=F6cker?= <horst.stoecker@web.de> To: rsgb_lf_group@blacksheep.org Organization: http://freemail.web.de/ X-Provags-Id: V01U2FsdGVkX19XgKnmCbBESNhH8ti74xCkCnhlDuJ6fq0eGpgSfJVE3p1oK ixYJ+L6FB6mWjgBMrTfrRxYgCcRE+3Hd1oKoRLMWpVtHUCWW3ASQ7gQ41+0a Q== X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: LF: RE: Noise cancelling by using optic transmission of RX signals Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: quoted-printable 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-IP: 193.82.116.20 X-Mailer: Unknown (No Version) In theory it's a good Idea which I had some weeks before without working= it out. Years before I also have made tests with FTA (free to air) optical transmi= ssions with a DL2CH-Transceiver and a TRX-Kit by Aatis which is quite much= simpler. Even with that it was no problem to link between two points about a few me= ters. In this case you should think about an IR-LED. Unfortunately, the Aatis re= ceiver has a photo transistor instead of a diode. But it should be no grea= t deal to modify that. The problems with FTA optic transmission for this application are imho: - You have to be sure, that no one can be injured by the laser beam, espec= ially at unattended operation. - Think about how many hours/the beam has it's full power before becoming= much weaker. - The optics must be kept clean. This could be a problem if the units are= out of reach. - The units have to be mounted absolutely stable. For Example, on a swingi= ng fibre rod you'll never bring a laser beam exactly to the rx area. I bet, (FTA) optical transmission just changes one problem with a few othe= rs. But the transmission with optical cable seems interesting. What type of cable do you suggest? I do not think, my TOS-Link cable would= stand weather/UV and mechanical conditions outside for a long time. Horst DO1KHS ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate f=FCr nur 16,99 Euro/mtl.!=20 http://produkte.web.de/go/02/