The authors would like to extend their sincere appreciation to the amateur radio operators who participated in this study. Without their cooperation and the donation of their time and assistance this study would not have been possible. In particular, we would like to thank Dr. Wayne Overbeck for contacting amateur radio operators in the Los Angeles area and for helping us coordinate the study. The late Harold L. Crispell performed a similar function in the San Diego area, and we would like to express our appreciation to his family.
We would also like to acknowledge the valuable assistance of Toni L. West, of the EPA's Las Vegas, Nevada, laboratory facility, in carrying out this study and in assisting in analysis of the data. Thanks are also due to Jerry Ulcek of the FCC for help in preparing the tables incorporated into this report and to Larry Petak, Steve Houck and David Sylvar of the FCC for reviewing and offering suggestions for improving the report.