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://jap.hu/electronic/rf.html
Peter's RF schematics page is a technical reference collection of radio frequency circuit diagrams spanning receivers, transmitters, and transceivers across a wide range of frequencies from 27MHz to 1GHz. Hobbyists and engineers will find schematics for superregenerative receivers, FM audio transmitters, walkie-talkies, SAW-based designs, and datasheets for chips from major manufacturers like Silicon Labs, HopeRF, and Texas Instruments.
http://oltw.blogspot.com/
Rachel Sussman's project documenting the oldest living organisms on Earth, from ancient chestnut trees to Siberian actinobacteria, combines scientific curiosity with fine art photography. Each post chronicles her travels to find and photograph these extraordinary subjects, paired with reflections on deep time, survival, and the nature of life itself.
https://astronomy.org/StarWatch/April/index-4-19.html
StarWatch is a weekly astronomy column produced by Moravian College covering night sky events, star maps, moon phases, and detailed guides to constellations and celestial phenomena visible from the Lehigh Valley region. Written by Dr. Terry Pundiak, each installment combines accessible storytelling with genuine astronomical depth, covering topics from the imaging of the M87 black hole to the mechanics of Easter dating and the effects of precession on telescope alignment.
http://icarc.org/
The Iowa City Amateur Radio Club (ICARC) serves ham radio enthusiasts in the Iowa City and Coralville area, offering resources on local repeaters, HF nets, fox hunts, and emergency operations. Visitors can find Field Day information, a Hall of Fame, WSPR presentations, and links to callsign lookups and real-time solar-terrestrial data.
https://www.dxzone.com/
DXZone is one of the oldest and largest directories for amateur radio operators on the internet, cataloging thousands of links across categories like antennas, DXing, software, operating modes, and radio equipment. Running since 1996, it also features news, contest information, DX pedition updates, and weekly curated roundups of the best ham radio websites.
https://www.qsl.net/g4prs
The Poole Radio Society (G4PRS) is a UK-based amateur radio club representing enthusiasts in the Poole area, hosted on the QSL.net network. The site serves as the club's online presence, likely featuring member information, club activities, and resources for local ham radio operators.
https://nerepeaters.com/
The New England Repeater Directory (NERD) is a volunteer-maintained database of amateur radio repeaters across the New England region, updated nightly to ensure accuracy. Visitors can search listings by location and band, plot results on Google Maps, and download the full database as a CSV file for use with radio programming software.
https://k-state.edu/w0qqq?utm_source=ksuarc&utm_medium=redirect&utm_campaign=pulled-down
The Kansas State University Amateur Radio Club (WØQQQ) has served K-State and the Manhattan, Kansas community for over a century, offering licensing workshops, emergency weather services, and participation in major ARRL contests. Membership is open to students, faculty, staff, and the general public, with no prior license required, making it a welcoming entry point for new ham radio operators.
https://eskimo.com/~oolon/wwdxc
The Western Washington DX Club (W7DX) is a ham radio club based in the Pacific Northwest, offering members access to DX bulletins, contest calendars, propagation forecasts, QSL bureau info, and a newsletter called the Totem Tabloid. The site includes meeting announcements, officer rosters, club bylaws, and links to regional ham radio clubs and resources throughout the 7th call area.