Instructions:

• Enter polynomial coefficients in the text boxes above.
• Leaving a text box blank will generate some strange effects.  A number - even zero - must be entered in all text boxes.
• Choose a scale.  All scales cover five decades of frequency.
• Click the start button and the Bode' plot will be generated.
• If you wish to change the scale, click the reset button after the plot is generated and choose a new scale.