title: External source for sample rate of Redhawk system
body: <p>We are using Redhawk for an FM modulator. It reads an audio modulating signal from a file, performs the modulation, then sends the modulated data from Redhawk to an external program via TCP/IP for DAC and up-conversion to RF.</p>
  
  <p>The data flows through the following components: rh.FileReader, rh.DataConverter, rh.fastfilter, an FM modulator, rh.DataConverter, and rh.sinksocket. The FM modulator is a custom component. 
  The rh.sinksocket sends data to an external server program that sends the samples from Redhawk to an FPGA and DAC.</p>
  
  <p>At present the sample rate appears to be controlled via the rh.FileReader component. However, we would like the external DAC to set the sample rate of the system, not the rh.FileReader component of Redhawk, for example via TCP/IP flow control.</p>
  
  <p>Is it possible to use an external DAC as the clock source for a Redhawk waveform?</p>