When were ham band plans introduced?

Answer 1

Ham band plans were introduced in the early 20th century, with the first official allocations occurring in 1927 when the U.S. government allocated specific frequency bands for amateur radio use. These plans were developed to organize and manage the growing number of amateur radio operators and to minimize interference among various users. Over time, international conventions and agreements have further shaped these band plans, adapting to technological advancements and the needs of the amateur radio community.