For more details, I have two files for test. One is 'all1' and another is 'all0'
+---------------------------------------------+ 'all1' |11111111111111111111111111| +---------------------------------------------+ result <http://goo.gl/fPHK>(image) +---------------------------------------------+ 'all0' |00000000000000000000000000| +---------------------------------------------+ result <http://goo.gl/P1HH>(image) (For convenience, I copied links to a diagram ASK.grc <http://goo.gl/0WHt>(image)) It seems that reading 0's appear more frequently in test with 'all0' So... I think it works somehow but... not perfect because non-zero values never appear in sending a 0 bit. I think there might be a somewhat 'blank out' of values from file source Is it inevitable when using file source block? Or Is it a somewhat sync problem? I'm new to GRC so it's a kind of hard things :( 2010/10/27 Josh Blum <[email protected]> > > > On 10/26/2010 10:17 PM, songsong gee wrote: > >> Currently I am trying to make an ASK (Amplitude Shift Keying) >> >> I use GNURadio Companion, >> >> The program gets the input from file source and multiplies it with signal >> source. >> >> And I monitors via Scope and FFT plots >> >> You can see a diagram ASK.grc (image)<http://goo.gl/0WHt> >> >> And the result is somewhat weird. Plots (image)<http://goo.gl/UcF9> >> >> >> It seems sinusoidal, but the shape looks like sawtooth! >> >> > You are multiplying random 1s and 0s by a sinusoid. And you have a sinusoid > that is randomly either 0 or sine(x). It looks correct! > > Perhaps you want to increase the temporal width of your symbols? In that > case, I suggest using the repeat block. > > _josh > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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