Re: LF: Laser link...

["Ken" <ken.h.wright@btinternet.com>]

Stefan.

I can only endorse Daniele's comments, I to worked on fibre optic communications for many years, and the only safe laser is one that is switched off, never wave a live optical fibre arround, you dont know who is near you, Class 1 lasers were listed as safe, these are found in CD players so I would use one of there from an old CD player, even so please dont take any chances. What about a bright LED as a source?

 

73s.

Ken.

M0KHW  

----- Original Message -----

From: Daniele Tincani

To: rsgb_lf_group@blacksheep.org

Sent: Sunday, October 09, 2011 9:18 AM

Subject: Re: LF: Laser link...

I too work with lasers daily (for fiber optics communications), but up to a few mW only :-)
Be careful with those laser guns, especially for eyes :-)
Regards

D.

Da: Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>
A: rsgb_lf_group@blacksheep.org
Inviato: Sabato 8 Ottobre 2011 23:29
Oggetto: 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 further advice. They told me they tried a 80W ERP laser into the sky, just for fun. Such things can be done on a university, never ever in industry, one 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 audio I wanted to send off of a passive reflector.  Wideband and excellent 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 wavelength you are using, mount this over the PIN diode detector...  This way the system is usable day or night without noticeable degradation due to sunlight.
>
> 73 Scott
>
>
> On 10/8/2011 12:26 PM, Stefan Schäfer wrote:
>> 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
>>>>
>>>>
>>>
>>
>>
>