Amateur
- 501
- Motorcycling Amateur Radio Club
- Resource for organization information, mission statement, chapter lists, events schedules and contact information.
- 502
- Penn-Ohio DX Society
- A PSK31 club open to all amateurs licensed to operate on the HF bands. Features FAQ, awards, member list and history.
- 503
- Quarter Century Wireless Association
- Club for amateur radio operators who have been licensed for over 25 years. Includes FAQ, how to join and an information center. International membership.
- 504
- Radio Amateur Old Timers' Association
- Open to anyone who has been actively involved in amateur radio for over 25 years. Contains committee member details, awards information, downloads and nets list. United Kingdom.
- 505
- Radio Society of Great Britain Contests
- The RSGB Contest committee is responsible to the board for all aspects of HF and VHF contests. Contains information on contesting, calendar, and results.
- 507
- Summits On The Air
- SOTA is an award scheme for radio amateurs and shortwave listeners that encourages portable operation in mountainous areas. There are awards for activators (those who ascend to the summits) and chasers (who either operate from home, a local hilltop or are even activators on other summits).
- 508
- World Castles Award Program
- A group that participates in a program to attract attention to historical and architectural heritage sites relating to fortification, including fortresses, castles and forts. Participates in QSOs with stations at historical monuments all over the world.
- 509
- VK2JLO
- Lockhart Olsen of Tweed Heads tells about his interests, and links to some Australian sites.
- 510
- VK3ASE One Sixty Meter Crossband Radio
- Program notes, history, and technical information on160m crossband transmissions from VK3ASE. Audio recordings of historic events and radio amateurs.
- 511
- VK3JDY
- John Young provides descriptions of operating and obtaining an amateur license in Australia, and modifying public mobile radio equipment for amateur use.
- 512
- VK3JED
- Links and articles, including public transport mobile operating, radio direction finding, repeaters, satellites and amateur television.
- 514
- VK4ADC
- Brisbane amateur, Doug Hunter, presents station and ham radio information, photos, software and links.