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<address@hidden>
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
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