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

[KY1K]

Bob and others.....

Argo is a fine program.

For extended weak signal reception, consider using Spectrum Lab tho. It's free.

It allows you to set up a complete superhet receiver in software with 
prefiltering and allows the center frequency to be set (you can look at 350 
to 360 hz with up to 256k bins instead of the more typical dc to xx 
frequency range with the bins divided into that range). You can go down to 
.0001 Hz bandwidth (or narrower) if needed-just the thing for very weak 
signals. The display parameters are fully adjustable, and you can change 
them on the fly instead of stopping the recording and replaying the saved 
file after making adjustments.

Further, it is loaded with features, such as programmable alarms when 
certain conditions are met and it saves the raw file so it can be processed 
later (at slower rates if needed).

l believe the macro function could be used to build decoding into the 
program allowing the program to decode tones and display the results in 
plain text.

The program has a built in signal generator as well, so it serves as a 
receiver and transmitter (with the ability to frequency modulate or 
amplitude modulate the signal generator output), no extra crystal dividers 
needed to generate stable tones for the tx.

While rf communication programs don't provide ultranarrow receiver 
bandwidths due to rf carrier stability issues, serious laser users should 
be considering Spectrum Lab when psk31, wsjt and Jason etc. limits are reached.

Regards,

Art


At 10:17 PM 12/14/2004, you wrote:

>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