Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6AE91380000E1; Sun, 9 Oct 2011 04:18:57 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RCoaR-0004fS-7u for rs_out_1@blacksheep.org; Sun, 09 Oct 2011 09:18:19 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RCoaQ-0004fB-5D for rsgb_lf_group@blacksheep.org; Sun, 09 Oct 2011 09:18:18 +0100 Received: from nm21-vm7.bullet.mail.ird.yahoo.com ([212.82.109.247]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1RCoaO-0005JH-Fv for rsgb_lf_group@blacksheep.org; Sun, 09 Oct 2011 09:18:18 +0100 Received: from [77.238.189.51] by nm21.bullet.mail.ird.yahoo.com with NNFMP; 09 Oct 2011 08:18:10 -0000 Received: from [212.82.108.126] by tm4.bullet.mail.ird.yahoo.com with NNFMP; 09 Oct 2011 08:18:10 -0000 Received: from [127.0.0.1] by omp1035.mail.ird.yahoo.com with NNFMP; 09 Oct 2011 08:18:10 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 738948.95690.bm@omp1035.mail.ird.yahoo.com Received: (qmail 2908 invoked by uid 60001); 9 Oct 2011 08:18:10 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1318148290; bh=8s7I7zgZOOUAiVUrLraZVMPeCgf3akevfQz+UZagsvA=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=dRRaLiNwtRhOke3uRp/vuiyFbTMRdASS5IMIOP+osK5wXY/OjXfQYZiBOMjt0oyXlfctZoV6ipPRl3am1tg8EX6LjsTWNHHY+w43YBA4bVq9RLMIrJh9ailWuoHATC2+51buPArdHPqLJfa6u/srClZsOQwL2/OdiA5iOROC25E= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=KtKotFX86Y98wpl85hcRlJe4tlrV6lv1y+fBQcLAKWPHcr941wecnf0y+Sga8/bnwjbi/HjOOHvzEQkyk6bT7jXksqQBNVtXU11pJCdN4xUC4VJ77QfZjz1lF4EOEyFXh7FqQQLgUuScgcBHwUkzeWakxSgj8oYYa8cUZz5kcZM=; X-YMail-OSG: .ryWA8kVM1k7bHx.oVTcI8KCf7tO8w5NcyXShvc3.CWHCv3 USqtO2xthsCbGhsvzhY_qyfjgkJuEA9TYYjDVyAIVZrto9rCQsDDUCAp1spD Ce1vxXkCrBnI0NhuBot9bTmrvtn3pxsAQNcufgN1zeye7DMV2HwJ_3HqjqYD 6eslaYKfx7zwqVKMvmFhlJtMLImg0X0WpfgRIqF5kKdH9_1dCFdPJ1.wYdpH vQ2rUDPZqzL2QqyAqfL9XNU8wWz7w3dM3RrRbyGppQRrOtQpblIVJ5ie0lUx rtGoY7x1txUdkr5md47xMstSHYN_cTEmPXQSyNbDR4rnqFmizwWZE04Bo2So 1euMKJgX.d969kuN39eav73qG3mjblFw9zE_Tcrx8jjX378Y87N1lZw8uKXo SpqV65HxrhXDwlC_JLD.RrneXD882G5qWBsM7zT2HUaCkCs9_H35R9tHb.rK T54TI.oOhZD2gcpasAkkRQ5c- Received: from [87.3.20.100] by web29513.mail.ird.yahoo.com via HTTP; Sun, 09 Oct 2011 09:18:10 BST X-Mailer: YahooMailWebService/0.8.114.317681 References: <4E9083DB.5090603@iup.uni-heidelberg.de> <4E909FCE.7060302@telus.net> <4E90A3F1.8080004@iup.uni-heidelberg.de> <4E90BD44.1060700@telus.net> <4E90C0CC.7070209@iup.uni-heidelberg.de> Message-ID: <1318148290.2129.YahooMailNeo@web29513.mail.ird.yahoo.com> Date: Sun, 9 Oct 2011 09:18:10 +0100 (BST) From: Daniele Tincani To: "rsgb_lf_group@blacksheep.org" In-Reply-To: <4E90C0CC.7070209@iup.uni-heidelberg.de> MIME-Version: 1.0 DomainKey-Status: good (testing) X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TINY_FONT=1.425 Subject: Re: LF: Laser link... Content-Type: multipart/alternative; boundary="2133552103-44841593-1318148290=:2129" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=1.0 required=5.0 tests=FORGED_YAHOO_RCVD,HTML_20_30, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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: 0:2:472208480:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m201.1 ; domain : yahoo.com DKIM : fail x-aol-sid: 3039ac1d40864e9158f11cdd X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --2133552103-44841593-1318148290=:2129 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I too work with lasers daily (for fiber optics communications), but up to a= few mW only :-)=0ABe careful with those laser guns, especially for eyes :-= )=0ARegards=0AD.=0A=0A________________________________=0ADa: Stefan Sch=E4f= er =0AA: rsgb_lf_group@blacksheep.or= g=0AInviato: Sabato 8 Ottobre 2011 23:29=0AOggetto: Re: LF: Laser link...= =0A=0AThanks again Scott. Yes, the building should be stable ;-) We have a = working group here that works with that optical stuff all the time, they su= rely can give me filters and further advice. They told me they tried a 80W = ERP laser into the sky, just for fun. Such things can be done on a universi= ty, never ever in industry, one reason to work here ;-)=0A=0A73, Stefan=0AA= m 08.10.2011 23:14, schrieb Scott Tilley:=0A> Hi Stefan=0A> =0A> I've creat= ed a wide-band audio link before using a laser.=A0 In fact, I used it to bo= unce the audio I wanted to send off of a passive reflector.=A0 Wideband and= excellent fidelity is possible, just ensure the object you are bouncing of= f is very stable otherwise you'll get microphonics (useful if you want to h= ear what's going on somewhere else :-)........=A0 I strongly recommend the = use of a very narrow band interference type filter for the laser wavelength= you are using, mount this over the PIN diode detector...=A0 This way the s= ystem is usable day or night without noticeable degradation due to sunlight= .=0A> =0A> 73 Scott=0A> =0A> =0A> On 10/8/2011 12:26 PM, Stefan Sch=E4fer w= rote:=0A>> Thanks Dex and Scott,=0A>> =0A>> Enough stuff to study now. The = seconds page seems more useful for me.=0A>> Ok about that OT.=0A>> =0A>> 73= , Stefan=0A>> =0A>> Am 08.10.2011 21:09, schrieb Scott Tilley:=0A>>> Hi Ste= fan=0A>>> =0A>>> http://www.k3pgp.org/laser.htm=0A>>> =0A>>> I use his dete= ctor and modulator circuits for my system.=0A>>> =0A>>> 73 Scott=0A>>> =0A>= >> =0A>>> =0A>>> =0A>>> On 10/8/2011 10:09 AM, Stefan Sch=E4fer wrote:=0A>>= >> LF,=0A>>>> =0A>>>> Just thought about trying a LF RX in the forest and f= eed the signal via a laser link to the building here. There is a good direc= t view to several suitable places, a good 1000m distant from the city. A si= mple laser diode, driven at 15 to 20 mA should work fine for some hours whe= n having a solar panel that charges during the day. You know these small la= mps for the garden with a solar panel, switching on automatically when it g= ets dark...=0A>>>> Just seen HA6PC at OE3GHB-grabber but nothing here or at= DF6NM (yes Mal, i know, you've all worked them in the past...).=0A>>>> Pur= e AM is probably not the best choice, rather FM.=0A>>>> Does someone of you= has useful experiance of such a laser system or even a ready to use circui= t or some hints about a compact IC that does the job?=0A>>>> =0A>>>> No war= nings about the danger of laser light please.=0A>>>> =0A>>>> 73, Stefan/DK7= FC=0A>>>> =0A>>>> PS: Sri for beeing a bit OT=0A>>>> =0A>>>> =0A>>> =0A>> = =0A>> =0A> --2133552103-44841593-1318148290=:2129 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
I too work with laser= s daily (for fiber optics communications), but up to a few mW only :-)
B= e careful with those laser guns, especially for eyes :-)
Regards<= /div>
D.
Da: Stefan Sch=E4fer <Stefan.Schaefer@iup.uni= -heidelberg.de>
A: r= sgb_lf_group@blacksheep.org
Inviat= o: Sabato 8 Ottobre 2011 23:29
Ogget= to: Re: LF: Laser link...

Thanks again Scott. Yes,= the building should be stable ;-) We have a working group here that works = with that optical stuff all the time, they surely can give me filters and f= urther advice. They told me they tried a 80W ERP laser into the sky, just f= or fun. Such things can be done on a university, never ever in industry, on= e reason to work here ;-)

73, Stefan
Am 08.10.2011 23:14, schrieb= Scott Tilley:
> Hi Stefan
>
> I've created a wide-band = audio link before using a laser.  In fact, I used it to bounce the aud= io I wanted to send off of a passive reflector.  Wideband and excellen= t fidelity is possible, just ensure the object you are bouncing off is very= stable otherwise you'll get microphonics (useful if you want to hear what'= s going on somewhere else :-)........  I strongly recommend the use of a very narrow band interference type filter for the laser wavelengt= h you are using, mount this over the PIN diode detector...  This way t= he system is usable day or night without noticeable degradation due to sunl= ight.
>
> 73 Scott
>
>
> On 10/8/2011 12:2= 6 PM, Stefan Sch=E4fer wrote:
>> Thanks Dex and Scott,
>>=
>> Enough stuff to study now. The seconds page seems more useful= for me.
>> Ok about that OT.
>>
>> 73, Stefan<= br>>>
>> Am 08.10.2011 21:09, schrieb Scott Tilley:
>= >> Hi Stefan
>>>
>>> http://www.k3pgp.org/laser.htm>>>
>>> I use his detector and modulator circuits fo= r my system.
>>>
>>> 73 Scott
>>>
= >>>
>>>
>>>
>>> On 10/8/2011 10:09 AM, Stefan Sch=E4fer 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 t= he city. A simple laser diode, driven at 15 to 20 mA should work fine for s= ome hours when having a solar panel that charges during the day. You know t= hese small lamps for the garden with a solar panel, switching on automatica= lly when it gets dark...
>>>> Just seen HA6PC at OE3GHB-grab= ber but nothing here or at DF6NM (yes Mal, i know, you've all worked them i= n 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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