Message-ID: <001501cc85dd$eaf9fc60$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <4E9083DB.5090603@iup.uni-heidelberg.de>
Date: Sat, 8 Oct 2011 17:15:45 -0000
MIME-Version: 1.0
Subject: LF: Re: Laser link...
Content-Type: text/plain;
	charset="ISO-8859-15"
Content-Transfer-Encoding: 8bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
X-AOL-SCOLL-URL_COUNT: 0  
x-aol-sid: 3039ac1d60554e9085755ca4
X-AOL-IP: 195.171.43.25
X-AOL-SPF: domain : blacksheep.org SPF : none


Stefan
You are making a Simple job Difficult
g3kev

----- Original Message -----
From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, October 08, 2011 5:09 PM
Subject: LF: Laser link...


> 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
>