| Abbreviation | Definition |
|---|---|
| AARA | Acadiana Amateur Radio Association |
| AARC | Albemarle Amateur Radio Club |
| AARC | Alger Amateur Radio Club |
| AARC | Ames Amateur Radio Club |
| AARC | Aruba Amateur Radio Club |
| AARC | Austin Amateur Radio Club |
| AARG | Aurora Amateur Radio Group |
| AARG | Ayr Amateur Radio Group |
| AARL | American Amateur Radio League |
| AARS | Army Amateur Radio System |
| AAS | Advanced Antenna Systems |
| ACS | Auxiliary Communications Service |
| ADARS | Antrim and District Amateur Radio Society |
| ADIF | Amateur Data Interchange Format |
| ADR | Additional Dialog Recording |
| ADRF | Analog Devices Radio Frequency |
| AERP | Average Effective Radiated Power |
| AF | Audio Frequency |
| AFC | Antennas For Communications |
| AGL | Above Ground Level |