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%
%   [signal]=generate_signal(signal_num);
%
%
%   So far I only have: 
%
%   signal 1:    100 Hz signal sampled at 1 Mhz.
%   signal 2:    100 Hz signal sampled at 1 Mhz with data that is 100 samples/bit (or each bit is 1 second wide).
%   signal 3:    GPS pre-amble sampled at (nominally) 10 samples/”chip”  
%
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