What frequency stability requirement must be adhered to according to amateur radio regulations?

The frequency stability requirement for amateur radio regulations is set at a minimum of 2 parts per million (ppm). This specification ensures that a transmitter remains within a defined frequency range, maintaining reliable communication and minimizing interference with other users of the radio spectrum.

Frequency stability is crucial in amateur radio operations for several reasons. Firstly, it ensures that signals do not drift too far from their assigned frequency, which could lead to interference with adjacent channels. Secondly, having a frequency stability of at least 2 ppm helps ensure that communication is clear and consistent, especially for modes that depend on precise frequency alignment, such as digital modes.

By adhering to this standard of 2 ppm, amateur radio operators can help maintain the integrity of the amateur spectrum, contributing to effective communication and operational efficiency. More stringent requirements, such as 1 ppm, may be applicable to other services or higher performance scenarios but are not mandated for amateur operators under the current regulations.