If you have neither oscilloscope, spectrum analyzer nor modulation monitor, but do have a soldering iron, you can use the Breakaway Calibration Tool to achieve acceptable calibration.

This tool will guide you through:

  • Using a regular sound card to create a makeshift oscilloscope
  • Use the parallel (printer) port on your PC to generate perfect squarewave
  • Calibrate the makeshift oscilloscope with this squarewave

And finally:

  • Calibrate Breakaway Broadcast's output with this oscilloscope.

Download the tool here