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)
https://sites.google.com/site/kb3awq/W3AHS
KB3AWQ.com is the personal amateur radio site of John W. Springman III, centered on the W3AHS and KB3AWQ repeater link system serving Williamsport, Pennsylvania. The site documents the technical setup of multiple linked repeaters across VHF, UHF, and HF bands including Echolink, Allstarlink, and Raspberry Pi-based interconnects, along with repeater coverage maps, band conditions, and a live Lycoming County scanner feed.
https://harc.net/
The Huntsville Amateur Radio Club (HARC) is a 501(c)(3) nonprofit based in Huntsville, Alabama, dedicated to educating and training members in amateur radio with a focus on emergency communications support. The site offers access to club resources including a newsletter, repeater and net information, a classifieds section, SKYWARN and ARES/RACES emergency programs, and a DX club.
https://1x1callsigns.org/
A dedicated resource for amateur radio operators looking to reserve FCC-authorized one-by-one (1x1) special event call signs for conventions, festivals, and other community celebrations. The site includes an FCC regulations guide, a searchable 1x1 callsign database, coordinator listings, and a reservation request system for temporary station operation.
https://marsradio.org/
Branson Repeaters serves the Missouri Ozarks Tri-Lakes area with a network of linked ham radio repeaters on 2 meters, 1.25 meters, and 70 cm, plus digital nodes connecting YSF, DMR Brandmeister, AllStarLink, and EchoLink. The site provides repeater frequencies, coverage details, hosted net schedules including a Skywarn Youth net, and local Branson weather from NOAA.
https://www.qsl.net/harc-az
The Hassayampa Amateur Radio Club (HARC) of Arizona maintains this QSL.net-hosted hub for local ham radio operators in the region. Visitors can find club information, meeting details, and resources connecting amateur radio enthusiasts in the Arizona area.
http://icstars.com/HTML/SolarSection/HAlpha/OBSERVINGTHESUNHAlpha1.html
David Knisely's comprehensive H-Alpha handbook covers solar observation in remarkable technical depth, with dedicated sections on prominences, sunspot group classification, solar flares, and a full glossary of H-Alpha terminology. Part of the larger ICSTARS Astronomy site, this resource is a serious reference for amateur astronomers interested in observing the sun through hydrogen-alpha solar filters.
http://briancoad.com/main.asp
Brian W. Coad, a retired ichthyologist from the Canadian Museum of Nature in Ottawa, shares decades of expertise through resources including a Dictionary of Ichthyology, annotated checklists of Canadian fishes, and detailed studies of freshwater fishes from Iran and Iraq. The site is a remarkable reference collection for anyone interested in fish taxonomy, zoogeography, and biodiversity, with content serious enough to be published as academic papers and books.
https://web.psrg.org/
The Puget Sound Repeater Group (PSRG) is a Seattle-area amateur radio club managing a network of repeaters, remote HF stations, and regular nets for ham radio operators in the Pacific Northwest. The site offers member resources, licensing exam info, educational presentations, and tools like live voter scopes and EchoLink/AllStar connectivity details.
http://jgiesen.de/welcomeEnglish.htm
A rich hobbyist resource by J. Giesen featuring an extensive collection of Java and JavaScript applets covering astronomy topics like sun and moon phases, planet positions, sundials, Venus transits, and satellite observation. Visitors will also find physics quizzes, chaos and fractal simulations, color theory tools, and links to books and software, making it a deep interactive playground for science enthusiasts.
https://tcfmc.org/
The Twin Cities FM Club (TCFMC) is a Minnesota-based amateur radio organization dedicated to emergency communications, community education, and operating local repeater frequencies for ham radio operators in the Twin Cities area. The site features club nets, a weekly swap shop on 146.76, membership sign-up, and resources on technologies like Wires-X, EchoLink, and AllStarLink.