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://swrrc.org/
The Southwest DMR Radio Club (SWRRC) appears to be an organization dedicated to DMR (Digital Mobile Radio) amateur radio communications in the southwestern region. The site serves as a hub for club members and ham radio enthusiasts interested in digital radio modes and repeater networks.
https://socalcontestclub.org/
The Southern California Contest Club, established in 1976, is the official web presence for a Southern California amateur radio contesting group, featuring a full calendar of upcoming ham radio contests including ARRL, CQ WPX, NAQP, and many other events. Visitors will find contest schedules, club information, and resources aimed at SoCal operators who participate in competitive radio contesting.
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.
http://seboldt.net/k0jd
K0JD's Ham Homebrew Site is a personal amateur radio page by the operator behind the callsign K0JD, focused on homebrewing radio equipment and DIY ham radio projects. The frames-based layout is a classic hallmark of old-web personal pages dedicated to the ham radio hobby.
https://w5yi.org/
W5YI Licensing Services Inc. is a nationwide Volunteer Examiner Coordinator (VEC) offering full-service amateur radio licensing support, including exam sessions, vanity call sign applications, license renewals, and club station licenses. The site also features a youth licensing program that covers FCC fees for applicants aged 25 and under, making it a practical hub for anyone pursuing or maintaining a ham radio license.
http://abmedia.com/astro
Chris Cook's extensive astrophotography portfolio spans nearly four decades of celestial imaging, featuring deep sky objects, comets, eclipses, auroras, and stunning nightscape photography captured on both film and digital equipment. With NASA APOD features, astrophotography workshops, and a vast archive organized by technique and subject, this is a remarkable showcase of dedication to the craft.
https://dailydx.com/propagation
The Daily DX is a hub for ham radio operators focused on DXing, offering a curated propagation page with links to solar data, space weather forecasts, and VOACAP prediction tools. Visitors can track HF propagation conditions, solar activity, and greyline predictions to optimize their chances of reaching distant or weak-signal stations.
http://twiar.org/
This Week in Amateur Radio (TWIAR) is a long-running news service delivering up-to-the-minute ham radio news via amateur repeaters, HF, shortwave, LPFM, and podcasting. Produced by Community Video Associates, Inc., it covers the latest developments in amateur radio technology, DX, satellites, and more, supported by listener donations.
https://www.qsl.net/7n3wvm
MINOWA Makoto (7N3WVM) shares detailed homebrew QRP amateur radio projects built entirely from scratch at his shack in Chiba, Japan. Visitors will find construction guides for transceivers, antenna tuners, crystal filters, frequency markers, magnetic loop antennas, and various measurement tools, all documented in both Japanese and English.
https://www.qsl.net/races
The national web presence for the Radio Amateur Civil Emergency Service (RACES), a program coordinating licensed amateur radio operators for emergency and disaster communications across the United States. Maintained by Ken Bourne (W6HK) since 1997, the site covers FCC RACES rules, news, volunteer protection information, and links to local RACES groups nationwide.