title: Can GNU Radio modulate and demodulate a text file?
body: <p>I'm new to sdr, dsp, and GNU Radio. My goal is to create an FSK demodulator for a project at work (<a href="https://stackoverflow.com/questions/36898574/fsk-demodulation-with-gnu-radio">described in this question</a>), but since I haven't been making progress, I'm trying to teach myself some of the basics.</p>
  <p>For practice, I'm trying to set up a GNU Radio flowchart that reads a text file, modulates it, then demodulates it, returning the same text as output.</p>
  <p><strong>Basic question:</strong> is it possible to read a text file, mod/demod, then return plain, readable text using GNU Radio? I'm trying to send and receive something simple, like &quot;Test, one two three.&quot;</p>
  <p><strong>Next question:</strong> if the above is possible, where am I going wrong in the following flowchart (the output file has size (~200 kb), but appears blank)?</p>
  <p><a href="https://i.stack.imgur.com/IEttm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IEttm.png" alt="Modulate and demodulate a text file with GNU Radio" /></a>
  Thanks for any advice!</p>