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://www.qsl.net/wb4kdi
Dave J. Barnes, callsign WB4KDI, maintains this amateur radio site covering radio equipment notes, operating notes, digital modes, and DX beacons. It also includes band condition monitoring tools and an online resources index, making it a handy reference for fellow ham radio enthusiasts.
http://normsrotorservice.com/
Norm's Rotor Service is the oldest and largest antenna rotator repair facility in the United States, specializing in sales, service, and parts for ham radio antenna rotators since the 1960s. With an inventory of over 25,000 parts covering brands like Cornell-Dubilier, Hy-Gain, and Telex, this is an essential resource for amateur radio operators needing rotor repairs or replacements.
http://navicom.com/~w7saa
A personal page for W7SAA, an amateur radio operator with a callsign-based URL suggesting a ham radio hobbyist presence. The site appears minimal, featuring little more than an image, but the callsign identifier strongly marks it as part of the amateur radio community.
https://www.qsl.net/milark/main/links/general-links.html
The links page for L.A.R.K. (likely a local amateur radio club) compiles dozens of curated resources for ham radio enthusiasts, including club homepages, repeater directories, VHF/UHF resources, callsign tools, and mailing lists. It serves as a comprehensive jumping-off point for the amateur radio community in Southeast Michigan and beyond.
https://life.itu.int/radioclub
The official site of 4U1ITU, the International Amateur Radio Club operating under the callsign of the International Telecommunication Union in Geneva, covering club history, QSL info, and notable operations. Highlights include Earth-Moon-Earth (EME) contacts, a historic material collection spanning 60 years of club activity, and expeditions like the ITU team's operation from Mont Blanc.
http://mndmr.net/
MNDMR.net is the home of Minnesota's first in-house DMR repeater CBRIDGE network, providing information about connected repeaters, talkgroups, and codeplugs for digital radio users in the region. The site serves the local amateur radio community with resources for the MNSTATE and MNTAC talkgroups on the Brandmeister network.
https://www.astronomynotes.com/
Nick Strobel's comprehensive Astronomy Notes covers everything from the scientific method and history of astronomy to telescopes, planetary science, and Einstein's relativity, originally written for his introductory astronomy courses. The site has been widely copied across the web as a testament to its value, and a printed edition is available through Kendall Hunt for those who want a physical copy.
http://faqs.org/faqs/space
The faqs.org Space Index is a comprehensive archive of Usenet FAQs dedicated to astronomy and space topics, covering everything from acronyms and data sources to how to become an astronaut and controversial space questions. Maintained across dozens of indexed documents, it serves as a structured reference hub for space enthusiasts and researchers seeking archived FAQ documents from the early internet era.
https://astronomy-links.com/
Clark M. Thomas of Roanoke, VA has assembled a free, non-commercial collection of astronomy links organized to help stargazers at all experience levels discover resources, from deep sky databases and space telescope galleries to star party listings and homework help. Highlights include curated 'Best of the Best' picks, a newest-links section for returning visitors, and a broad sweep of resources covering Mars missions, the Messier catalog, observing clubs, and more.
https://www.hobbyprojects.com/useful_site_links.html
HobbyProjects.com curates an extensive collection of links to electronics tutorials, circuits, engineering projects, and useful resources for hobbyists at all skill levels. The site also offers its own tutorials covering topics from basic electronics to microcontrollers, along with dictionaries, formulas, and reference materials for electronics enthusiasts.