Science & Nature
1439 sites
Subcategories:
- Astronomy & Space (396)
- Chemistry (8)
- Earth Sciences (26)
- Biology (79)
- Physics (30)
- Mathematics (59)
- Weather & Climate (104)
- Amateur Radio (682)
- Electronics (47)
http://homingin.com/
Maintained by Joe Moell (K0OV) since 1988, Homing In is a comprehensive resource dedicated to radio direction finding, foxhunting, and amateur radio direction finding (ARDF) competitions worldwide. Visitors will find news about international championships, technical projects, equipment guides, event results, wildlife tracking applications, and a wealth of articles spanning decades of expertise in the hobby.
https://barc.org/
The Boston Amateur Radio Club (BARC) connects ham radio enthusiasts across the Greater Boston area, offering repeater access, club meetings, licensing exam sessions, and public service events. The site includes field day archives dating back to 2000, repeater guides, a club newsletter, and resources for both new and experienced operators.
http://wa1mba.org/
Tom WA1MBA has built a comprehensive resource dedicated to microwave amateur radio, covering everything from 10GHz rainscatter propagation to millimeter wave band projects, waveguide design, and LNA and quadrupler hardware builds. Active since 1996, the site features technical papers, conference presentations, RF connector guides, and a mailing list reflector for fellow microwave ham enthusiasts.
http://redcircuits.com/
RED Free Circuit Designs is a hobbyist electronics resource offering dozens of free audio amplifier schematics, preamplifier modules, headphone amplifiers, and miscellaneous electronic circuit designs. Visitors can browse Class-A and Class-B amplifier projects, phono preamps, intercom circuits, and many more practical designs, all available at no cost.
https://occultations.org/
The International Occultation Timing Association (IOTA) is a volunteer scientific organization founded in 1983 that coordinates amateur astronomers in timing astronomical occultations, including stars being blocked by asteroids and the Moon. The site offers observing guides, equipment recommendations, occultation predictions, citizen science campaigns, and published data that has contributed to real discoveries such as new double stars and improved asteroid shape models.
https://www.qsl.net/fwdxa
The Fort Wayne DX Association (FWDXA) is a Northeast Indiana amateur radio club founded in 1975, bringing together DXers for contests, DXpeditions, and bimonthly meetings. The site includes sections on DX operations, a contest calendar, member pages, historical QSL cards, and Top Band musings, making it a solid hub for regional ham radio enthusiasts.
http://amasci.com/amateur/traffic/traffic1.html
William J. Beaty, a Seattle electrical engineer, explores the fascinating physics of traffic jams, showing how waves propagate through congested highways much like fluid dynamics. The site features animations, experiments, and practical techniques for how a single driver can actually dissolve traffic slowdowns, making it a genuinely mind-expanding read for any commuter.
https://marc-hq.org/
The Motorcycling Amateur Radio Club (MARC) is a community group that combines motorcycle riding with ham radio operation to support charity fundraising events like Bike MS rides in Southern California. The site includes a tech center, photo gallery, newsletters, event calendar, and membership information for riders and operators who want to combine their passions while giving back.
https://n8ara.org/
The Newark Amateur Radio Association (N8ARA) serves ham radio enthusiasts in central Ohio, providing a community hub for licensed operators in the Newark area. Visitors can learn about club membership, meetings, and local amateur radio activities in the region.
https://vijfsnippervijf.neocities.org/
Vijfsnippervijf's personal corner of the web showcases a wide range of creative works including original music, visual art, short stories, and opinion pieces, with a dedicated section on ham and amateur radio. The site also features Linux Mint content, Last.fm music integration, a dev log, and a guestbook, making it a lively and eclectic personal hub.