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://hfpower.com/
ACOM is a manufacturer of HF linear amplifiers and related amateur radio equipment, including the flagship ACOM 2000A automatic amplifier and the ACOM 1000A. The site serves as a product hub for serious ham radio operators seeking high-power amplification solutions built around tubes like the Svetlana 4CX800A.
https://radioamator.ro/
Radioamator.ro is a comprehensive Romanian-language portal for amateur radio operators, covering everything from equipment construction and digital communications to DX activities, contest calendars, and propagation bulletins. The site serves the Romanian ham radio community with articles, a callbook, forums, and links to the Romanian Amateur Radio Federation.
https://qsl.net/sv2ael/greekhamail.htm
Created by Greek amateur radio operator SV2AEL, this page is a comprehensive alphabetical directory of over 580 email addresses for licensed ham radio operators across Greece, organized by callsign prefix. A unique and practical reference for the Greek ham radio community, it covers all SV, SW, SX, and SZ callsign districts and is maintained as a personal initiative by Savas Pavlidis.
http://allthesky.com/
Created by Till Credner and Sven Kohle, AllTheSky.com is a stunning astrophotography gallery spanning comets, nebulae, galaxies, constellations, aurora borealis, and atmospheric phenomena. The site offers an impressive breadth of celestial imagery including nightscapes, 360-degree views, live all-sky feeds, and articles that make it a rich destination for astronomy enthusiasts.
https://dsimanek.vialattea.net/home.htm
Donald Simanek, a physics professor, has assembled a sprawling collection of resources covering physics puzzles, perpetual motion machines, pseudoscience debunking, creationism criticism, and science humor. Highlights include the Museum of Unworkable Devices, illustrated lectures, and a rich archive of skeptical and educational content that has earned recognition as one of the top skeptical websites on the web.
https://w9dup.org/
The official site of W9DUP, the DuPage Amateur Radio Club (DARC) based in Illinois, covering club news, membership, Field Day results, hamfests, ARES emergency preparedness, and local amateur radio events. Visitors can find an active club calendar, EchoLink and IRLP info, licensing education resources, and a showcase of the club's 7th-place national Field Day finish.
https://hamtv.com/
Ham TV is a comprehensive resource for Amateur Television (ATV) run by Tom O'Hara W6ORG, the retired owner of P.C. Electronics, which supplied ATV equipment to ham radio operators for 50 years. Visitors will find technical guides, antenna recommendations, transmitter specs, application notes, and a wealth of practical information for getting started with live color video transmission on amateur radio bands.
http://kf6c.com/
KF6C is an amateur radio operator's site featuring information on remote radio operation, custom transceiver designs like the SL600 and G3ZVCmkII, and vintage radios including Eddystone and Collins equipment. Visitors can also browse hard-to-find parts and accessories for sale, making it a useful stop for both radio hobbyists and collectors.
https://oasi.org.uk/
The Orwell Astronomical Society Ipswich (OASI) is a UK-based astronomy club centered at the historic Orwell Park Observatory in Suffolk, welcoming everyone from casual stargazers to dedicated amateurs with specialist observing and telescope-building skills. The site features upcoming lecture events and Zoom talks, member observing reports, a newsletter archive, comet guides, and a rotating gallery of impressive astrophotography captured by members.
http://nationalcurvebank.org/
The National Curve Bank is a mathematical archive dedicated to cataloging and exploring curves, offering detailed information on their properties, equations, and historical significance. A sister site to the Witch of Agnesi page, this project serves as an educational reference for students, educators, and math enthusiasts interested in the geometry of curves.