[Laser] Simple optical beacon experiment in San Diego

[F1AVYopto at aol.com]

Dans un e-mail daté du 13/03/2006 18:39:49  Paris, Madrid, 
kbanke at qualcomm.com a écrit :
Kerry Banke N6IZW

Kerry  your LUXEON beacon is a very good idea.
Remember your 700 Hz modulation give  typically -12 dB less gain than the 60 
Hz or 120 Hz city lamps effect  because the ULF K3PGP receiver response.
To avoid saturation and improve the  S/N you could use the JASON (I2PHD) 
FFTDSP program at 75 Hz and at normal speed  (three characters / minutes) to 
modulate your beacon.
75 Hz is again in the  good gain area so a simple level adjustment at the RX 
input audio card avoids  all the saturation effects.  
Everybody could receive your beacon  messages in character mode on a simple 
PC.
The -35 dB under noise JASON  capability allows “cloud bounce” and ultimate 
low signal links.
73  Yves
http://pageperso.aol.fr/yvesf1avy/