Tutorial: Create Your Own ORTF Field Microphone Protractor Posted on January 9, 2014November 7, 2014 Posted in Field Recording, TutorialTagged field recording, microphone, ortf, tutorial6 Comments Here’s how to create your own custom ORTF field protractor that contains both 110 degrees and 17cm. 1. Download the docx file. 2. Print the file. (measure the red arrow and insure you have your 17cm) 3. Cut out the required angle from 0 until the solid line at 110 degrees. 4. I used moving tape to plastify. Cut out enough strips to cover the bottom side. 5. Drop the cut out protractor on the tape. 6. Apply tape to the top side now covering up any exposed paper. 7. Cut out the excess tape as closely to the edge as possible. 8. Set your microphone positions. 9. Rec.