[Laser] Laser Cloud Bounce with WOLF-GUI program

[F1AVYopto at aol.com]

Dans un e-mail daté du 22/08/2006 18:01:21 Paris, Madrid (heure d'été),  
kbanke at qualcomm.com a écrit :

Do you  have any feel for how much the noise floor rises 
in your system with  daylight? 


 
Kerry, 
Our receivers  are fully unsuitable in daylight. 
But, with a  good dielectric filter centred on 800 nm, it is probably  
possible. 
Our night  signal was at -12 dB under global noise. 
In daylight,  with the filter the residual light could give up to 30 dB extra 
noise  because the WOLF detectivity limit is near -45 dB. 
But at this  S/N level, WOLF-GUI will need may be half an hour to decode the  
message... 
You give us a  good project because with a residual light the RX speed goes 
up (PN  Rshunt photodiode goes down) and in daylight the spurious lines from 
city  sodium lights are not present. 
Without these  spurious lines other programs like the K1JT JT65A could be use 
!.    
We will test  this option a day with F8DO 
Yves.