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://smartsonline.org/
SMARTS is the Southwest Metro Amateur Radio Transmitting Society, a ham radio club serving members who are licensed or pursuing their FCC Part 97 amateur radio license. The club hosts weekly nets on the WB0RMK repeater, monthly meetings, and community breakfasts, making it a welcoming hub for both new and experienced ham radio operators.
https://rfcafe.com/
RF Cafe is a comprehensive resource for RF and electronics engineers, offering formulas, reference data, vintage magazine archives, software tools, forums, and a massive parts and services directory. Running since 1996, the site blends technical depth with nostalgia, featuring scanned articles from classic publications like QST, Popular Electronics, and Radio-Craft alongside modern engineering utilities.
https://www.qsl.net/kb4kvt/index.htm
KB4KVT is a personal amateur radio homepage featuring the callsign of a licensed ham operator, with imagery of an Eimac 4-1000 transmitting tube hinting at high-power RF interests. The site serves as a landing page for a ham radio enthusiast, likely covering equipment, operations, or related technical topics.
http://scotese.com/
The PALEOMAP Project, run by Christopher Scotese, is a comprehensive scientific resource illustrating the plate tectonic development of Earth's ocean basins and continents over the past 1.1 billion years. Visitors can explore full-color paleogeographic maps, interactive 3D PaleoGlobes, animations of ancient Earth configurations like Pangea, and download materials for geology education.
https://cmara.org/
The Central Massachusetts Amateur Radio Association (CMARA) is a nonprofit club welcoming ham radio hobbyists and newcomers in the Central Massachusetts region, affiliated with the American Radio Relay League. The site offers club news, meeting minutes, repeater information, nets schedules, VE test session announcements, and resources for anyone looking to get started in amateur radio.
http://aleph0.clarku.edu/~djoyce/java/compass
David E. Joyce of Clark University presents a detailed mathematical exploration of compass-only geometric constructions, proving that a straightedge is unnecessary for any Euclidean construction. The site covers circle inversion, stereographic projection, inversive geometry, and involutory quandles, drawing on the historical work of Mohr and Mascheroni.
http://treasurecoastastronomy.org/
The Treasure Coast Astronomy Society (TCAS) maintains this site as a hub for amateur astronomers along Florida's Treasure Coast, covering topics like astrophotography, telescopes, and optical instruments. With keywords spanning apochromatic refractors, go-to mounts, and astronomy software, this is a classic old-web astronomy club presence for serious hobbyists and stargazers.
https://ei7gl.blogspot.com/
John, EI7GL, runs this detailed amateur radio diary chronicling propagation experiments, solar cycle activity, and DX contacts across a wide range of frequency bands from Medium Wave to Microwaves. With thousands of labeled posts covering callsigns from around the world, solar flux data, and band opening reports, it is an invaluable log for radio enthusiasts following HF and VHF propagation conditions.
http://aprs.net/
Steve Dimse's site introduces APRS (Automatic Position Reporting System), a ham radio-based network for transmitting GPS position reports, weather data, and messages, with an interactive Java applet showing live amateur radio operator positions in South Florida. The site showcases Steve's own contribution to APRS: the internet gateway software (javAPRS) that bridges local ham radio packets to the web for real-time map display.
http://lists.contesting.com/_3830
The 3830 mailing list archives preserve decades of amateur radio contesting discussion, spanning from 1996 through 2023. Operators and contesters can browse monthly threads or search the full archive to find score postings, contest strategies, and community conversation going back nearly 30 years.