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

[riese-k3djc at juno.com]

On Tue, 14 Dec 2004 23:38:37 EST TWOSIG at aol.com writes:
> Bob

Hi Jim

If I understand scanning that means you would sweep your Tx or Rx 
and create a fan pattern of X number degrees wide. The tone that is
modulating
your TX would remain the same. Argo or Speclab would still be useful
in seeing that tone and at a QRSS of 3 still see it well under the noise
and fast enough
to exchange info for a uhhhh short contact

FYI

using my Laser front end connected to my LF rcv i was able to see
response well
above several hundred Khz. Pointing at my computer screen really made
things howl
I was able to see the sub Cxr from the Ramsie TX well and detect it from
different locations 
within my house. Cool Stuff

Bob K3DJC



> 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
>  
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