Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 474A1380000B8; Sun, 9 Oct 2011 05:31:41 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RCpiK-0005Nk-CQ for rs_out_1@blacksheep.org; Sun, 09 Oct 2011 10:30:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RCpiJ-0005Nb-Tl for rsgb_lf_group@blacksheep.org; Sun, 09 Oct 2011 10:30:31 +0100 Received: from smtp02.smtpout.orange.fr ([80.12.242.124] helo=smtp.smtpout.orange.fr) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RCpiG-0005qQ-Uz for rsgb_lf_group@blacksheep.org; Sun, 09 Oct 2011 10:30:31 +0100 Received: from [127.0.0.1] ([86.212.77.126]) by mwinf5d56 with ME id iZWM1h0052jWKQ603ZWPZ8; Sun, 09 Oct 2011 11:30:23 +0200 X-ME-engine: default Message-ID: <4E9169AD.8090609@wanadoo.fr> Date: Sun, 09 Oct 2011 09:30:21 +0000 From: "Jean-L. RAULT" User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4E91694C.8060900@orange.fr> In-Reply-To: <4E91694C.8060900@orange.fr> X-Forwarded-Message-Id: <4E91694C.8060900@orange.fr> X-Spam-Score: 1.6 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126,RATWARE_GECKO_BUILD=1.426 Subject: Fwd: Re: LF: Laser link... Content-Type: multipart/alternative; boundary="------------030504060009040703030603" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY 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: 0:2:460315136:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61884e9169fd4b6c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------030504060009040703030603 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 8bit I wonder if an analog laser link has enough linearity to carry your LF signals (bad lienarity ==> noise and intermod effects) A digital laser link would be better, but would increase the complexity of the project :o) Jean-Louis F6AGR Le 08/10/2011 19:26, Stefan Schäfer a écrit : > Thanks Dex and Scott, > > Enough stuff to study now. The seconds page seems more useful for me. > Ok about that OT. > > 73, Stefan > > Am 08.10.2011 21:09, schrieb Scott Tilley: >> Hi Stefan >> >> http://www.k3pgp.org/laser.htm >> >> I use his detector and modulator circuits for my system. >> >> 73 Scott >> >> >> >> >> On 10/8/2011 10:09 AM, Stefan Schäfer wrote: >>> LF, >>> >>> Just thought about trying a LF RX in the forest and feed the signal >>> via a laser link to the building here. There is a good direct view >>> to several suitable places, a good 1000m distant from the city. A >>> simple laser diode, driven at 15 to 20 mA should work fine for some >>> hours when having a solar panel that charges during the day. You >>> know these small lamps for the garden with a solar panel, switching >>> on automatically when it gets dark... >>> Just seen HA6PC at OE3GHB-grabber but nothing here or at DF6NM (yes >>> Mal, i know, you've all worked them in the past...). >>> Pure AM is probably not the best choice, rather FM. >>> Does someone of you has useful experiance of such a laser system or >>> even a ready to use circuit or some hints about a compact IC that >>> does the job? >>> >>> No warnings about the danger of laser light please. >>> >>> 73, Stefan/DK7FC >>> >>> PS: Sri for beeing a bit OT >>> >>> >> > > --------------030504060009040703030603 Content-Type: text/html; charset=ISO-8859-15 Content-Transfer-Encoding: 8bit 











I wonder if an analog laser link has enough linearity to carry your LF 
signals (bad lienarity ==> noise and intermod effects)
A digital laser link would be better, but would increase the complexity 
of the project :o)

Jean-Louis F6AGR





Le 08/10/2011 19:26, Stefan Schäfer a écrit :
> Thanks Dex and Scott,
>
> Enough stuff to study now. The seconds page seems more useful for me.
> Ok about that OT.
>
> 73, Stefan
>
> Am 08.10.2011 21:09, schrieb Scott Tilley:
>> Hi Stefan
>>
>> http://www.k3pgp.org/laser.htm
>>
>> I use his detector and modulator circuits for my system.
>>
>> 73 Scott
>>
>>
>>
>>
>> On 10/8/2011 10:09 AM, Stefan Schäfer wrote:
>>> LF,
>>>
>>> Just thought about trying a LF RX in the forest and feed the signal 
>>> via a laser link to the building here. There is a good direct view 
>>> to several suitable places, a good 1000m distant from the city. A 
>>> simple laser diode, driven at 15 to 20 mA should work fine for some 
>>> hours when having a solar panel that charges during the day. You 
>>> know these small lamps for the garden with a solar panel, switching 
>>> on automatically when it gets dark...
>>> Just seen HA6PC at OE3GHB-grabber but nothing here or at DF6NM (yes 
>>> Mal, i know, you've all worked them in the past...).
>>> Pure AM is probably not the best choice, rather FM.
>>> Does someone of you has useful experiance of such a laser system or 
>>> even a ready to use circuit or some hints about a compact IC that 
>>> does the job?
>>>
>>> No warnings about the danger of laser light please.
>>>
>>> 73, Stefan/DK7FC
>>>
>>> PS: Sri for beeing a bit OT
>>>
>>>
>>
>
>
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