[Laser] One way 3 mile laser NLOS contact using PSK31

[TWOSIG at aol.com]

Bob
 
I was thinking in terms of scanning a 90 degree sector of the horizon for  
the other station.  My assumption is that slow CW would be useful point to  
point, say from a Canadian town across one of the smaller Great Lakes to a US  
town.  With a transmitter and receiver at pre-determined angles, they can  stare 
at each other long enough to detect a sequence of 120 second dots.
 
To use an analogy, if I know that I am going to listen for signals on  
144.055000 MHz, I can spend a couple of hours exchanging call signs, if that is  
what it takes to detect a weak signal.  At the current state of  experimentation, 
it is a better suggestion than I had.  It just is not  within the context of 
what I had in mind.  My idea was more like trying to  scan up from 145 MHz to 
147 MHz repeatedly looking for a signal that is sweeping  from 147 MHz down to 
145 MHz.  
 
I guess that I just am not thinking in terms of a weak signal.  My  idea is 
more how to snag a moderately strong signal, scan in restricted area  close to 
where I detected it, then lock onto it and exchange bulk data at  moderate 
speed.
 
I hope that helps explain what I was thinking.
 
James
N5GUI
 
 
 
 
In a message dated 12/14/2004 9:37:20 P.M. Central Standard Time,  
riese-k3djc at juno.com writes:
Also consider the slow CW that the LFers are  using
look into ARGO program,,, signals 30 Db under the noise can be  decoded
just using your soundcard

Bob K3DJC

CW speeds from 3  second dots to 120 second dots