Section 157.52. Computation of open site requirements—nonstandard sites

(a) Microphone distance. If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 meters), the test site shall be an open site within a radius from both points which is equal to the distance between the microphone location point and the microphone target point.

(b) Diagrams. Plan view diagrams of nonstandard test sites are shown in Figures 2 and 3 of Appendix A of this chapter. Figure 2 illustrates a test site which is larger than a standard test site and is based upon a 60 foot (18.3 meters) distance between the microphone location point and the microphone target point. Figure 3 illustrates a test site which is smaller than a standard test site and is based upon a 35 foot (10.7 meters) distance between the microphone location point and the microphone target point.