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://ssbusa.com/
SSB Electronic USA is a Pennsylvania-based specialty retailer focused on VHF, UHF, and SHF amateur radio equipment, offering products like GaAsFET preamplifiers, transverter systems, low-noise LNAs, and satellite gear. Featuring brands such as MUTEK, M2 Inc., WinRadio, and AIRCOM, this mid-1990s catalog site serves serious ham radio operators and microwave enthusiasts looking for high-performance RF components.
http://nmia.com/~roberts/robert.html
Robert Smathers maintains this personal hub dedicated to TVRO (Television Receive Only) satellite reception, featuring links, schedules, mail lists, newsgroups, and dealer resources for satellite hobbyists. The site also touches on visual satellite observing and space topics, making it a useful reference point for backyard dish enthusiasts.
https://wb1gof.org/
PART of Westford (WB1GOF) is the Police Amateur Radio Team of Westford, Massachusetts, an ARRL Special Service Club with over 45 years of history serving Eastern Massachusetts ham radio enthusiasts. The site covers club activities including fox hunting, D-Star repeaters, emergency communications, kit-building sessions, and a newsletter archive called Particles stretching back to 2000.
https://enchantedlearning.com/subjects/astronomy/glossary/index.shtml
Zoom Astronomy from EnchantedLearning.com is a comprehensive astronomy glossary and educational reference covering terms from A to Z, with illustrated definitions of concepts like aberration of light, aphelion, asteroids, and more. Aimed at K-12 students and teachers, the site includes printables, worksheets, and detailed pages on the solar system, stars, comets, and notable astronomers.
https://qsl.net/wa6rc
The Westside Amateur Radio Club has served ham radio operators in the West Los Angeles area since 1987, earning recognition from the ARRL for emergency communications and advocacy against restrictive antenna ordinances. Visitors can find club meeting schedules, weekly net frequencies, Field Day event recaps, and an Elmers program connecting members with experienced hams for free guidance.
https://tube.be/
A specialized reference guide cataloging the vacuum tube types used in shortwave radio broadcast transmitters, organized alphabetically and numerically for easy lookup. The site also lists manufacturers, rebuilders, and distributors worldwide, including companies like Thales, Eimac, Penta Laboratories, and Xuguang, making it a practical industry directory for broadcast engineers.
https://www.qsl.net/n1bwt/contents.htm
Paul Wade W1GHZ has published his comprehensive Microwave Antenna Book online, covering everything from parabolic dish antennas and horn feeds to electromagnetic field analysis and antenna range measurements. A deep technical reference spanning 13 chapters with downloadable software tools, this is an essential resource for amateur radio operators working in the microwave frequency bands.
https://astroring.auroradynia.com/
The Astronomy Webring, hosted by auroradynia, connects enthusiasts of astronomy, astrophotography, and astrophysics across the old web. Visitors can join the ring, browse the member list, or simply hop between sites dedicated to all things space.
https://mnwashcoares.org/
WCARES is the Washington County, Minnesota chapter of the Amateur Radio Emergency Service (ARES), coordinating licensed ham radio operators to support county emergency management during floods, severe weather, and mass sheltering events. The site outlines their mission, coverage priorities, and lists key leadership with callsigns, serving as a hub for emergency communication volunteers in the St. Croix River valley region.
https://www.qsl.net/sra
The Sierra Radio Association's former web presence, now redirecting visitors to their new home at k6sra.org. This amateur radio club page serves as a forwarding notice for members and ham radio enthusiasts looking to connect with the organization.