I'm a graduate Mechanical Engineer who designed and built machine tools for 35 years. I completed 23 years of Reserve service with the U.S. Navy as a Cryptologic Chief Petty Officer, and have held an amateur radio operator's license since 1955. As a certified ARRL Instructor and Volunteer Examiner, I teach preparatory classes for all grades of amateur radio licenses. This involves teaching mathematics, electricity, electronics, and regulations. Many adult candidates are uncomfortable with...