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
>>>
>>>
>>
>
>