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://wm7d.net/
Mark Downing (WM7D) runs this ham radio hub featuring a searchable callsign database, real-time solar flux reports, and dedicated resource pages for Yaesu radios including the FT2000, FT920, and FT100. Visitors will also find DX cluster links, QSO maps, TR Log for Linux, and a curated collection of amateur radio links.
https://m0yng.uk/
Christopher M0YNG is a radio amateur based in Gloucestershire whose personal site covers amateur radio, solar and battery tracking, self-hosted tech, and small computing projects like the Penkesu Tiny Computer. The site is notably available via Gopher, Gemini, and Tor in addition to HTTP, making it a fascinating example of smolnet philosophy in practice.
https://hexkit.com/
Ron Mott (W4RDM) runs HexKit.com, a small operation fabricating baseplate kits, hubs, and components for homebrew Hex Wire Beam, Moxon, and Spiderbeam amateur radio antennas. Over 1,700 homebrew hex beam builds have used HexKit baseplates worldwide, making this a well-regarded niche resource for DIY antenna builders.
http://ka7oei.blogspot.com/
Clint KA7OEI shares deep technical explorations on amateur radio, electronics, and RF experimentation, with posts covering everything from WSPR beacons and WWVB clocks to ultrasonic receivers and antenna modifications. The breadth of tag keywords alone reveals years of obsessive hands-on tinkering, making this a goldmine for technically-minded hams and electronics hobbyists.
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.
https://www.qsl.net/7n3wvm
MINOWA Makoto (7N3WVM) shares detailed homebrew QRP amateur radio projects built entirely from scratch at his shack in Chiba, Japan. Visitors will find construction guides for transceivers, antenna tuners, crystal filters, frequency markers, magnetic loop antennas, and various measurement tools, all documented in both Japanese and English.
https://www.qsl.net/sparc
The Hamilton County Amateur Radio Club serves the Adirondack Mountains region of New York, coordinating repeaters, emergency communications nets, and ARES/RACES operations across Hamilton and neighboring counties. Visitors will find meeting schedules, repeater frequencies, event listings like Field Day and the Southern Adirondack Hamfest, and resources for anyone interested in getting a ham radio license.
https://spiritone.com/~nordlund/arrg.html
The Amateur Radio Relay Group (ARRG) is an Oregon-based 501(c)(3) non-profit that has served the amateur radio community since 1977, operating the statewide K7RPT Repeater System with eighteen-plus VHF and UHF repeaters. The organization provides emergency communications support to search and rescue teams, county sheriff offices, and first responders across Oregon, with digital capabilities including DMR and Yaesu System Fusion.
https://hamexam.org/
HamExam.org has been helping aspiring ham radio operators pass their licensing exams since 2003, offering completely free practice tests and flash cards for Technician, General, and Extra class licenses. The site covers all current FCC question pools and includes account tracking so users can monitor their progress on problem areas.
https://homepages.abdn.ac.uk/nph120/astro/astlinks.html
Assembled by John S. Reid at the University of Aberdeen, this curated astronomy links page was built to support a Level 1 Astronomy class, covering general astronomy, the solar system, space missions, and observatories. With over 200 links organized into clear sections, it points students to tools like Stellarium, NASA catalogues, online textbooks, and the European Space Agency.