What is an SMA connector?

An SMA (SubMiniature version A) connector is a very compact, threaded RF connector widely used in modern amateur radio equipment, particularly for handheld transceivers and microwave applications. Its threaded design provides a secure mechanical connection and excellent electrical performance at very high frequencies. Because of its precise construction, an SMA connector can reliably handle signals well into the microwave range, often up to 18 GHz. This makes it far superior to older, larger connectors like the PL-259 or BNC for UHF and microwave work. The distractors rely on false acronym expansions, such as "serial multiple access" or mixing up connector letter designations like "type-S to type-M." Remember that SMA stands for SubMiniature A and is characterized by its small size and high-frequency capabilities.