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
|
