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://k5sar.com/
The Shreveport Amateur Radio Association (K5SAR) is an ARRL Special Service Club based in Northwest Louisiana, founded in 1978 and serving over 120 licensed ham radio operators of all ages and experience levels. The site covers club membership, public service events, SKYWARN severe weather communications, hamfests, license exam resources, and local repeater information.
https://amateur-radio.net/rptr
Operated by K1IW, this searchable database lets ham radio operators and enthusiasts look up amateur repeaters and broadcast transmitters across all 50 U.S. states, Washington D.C., and Canadian provinces. Users can filter results by band, digital mode (DMR, D-STAR, YSF), distance from a location, and more, with data sourced from official FCC and NFCC coordination records.
https://w6ze.org/
The Orange County Amateur Radio Club (OCARC) has been serving Southern California ham radio enthusiasts since 1934, making it one of the longest-running ARRL-affiliated clubs in the region. Visitors will find meeting schedules, club nets, emergency communications info, a newsletter archive, VE testing sessions, and resources covering everything from satellite communications to digital modes like FT8 and D-STAR.
http://freidaybird.blogspot.com/
Don Freiday's nature blog blends wildlife photography, birding observations, and philosophical reflections from the Pine Barrens of New Jersey and beyond. With over 3,000 posts and a career spanning competitive birding events across Texas, Israel, and the U.S., Freiday brings genuine expertise and a naturalist's eye to every entry.
https://oevsv.at/home
The ÖVSV (Österreichischer Versuchssenderverband) is the official national amateur radio organization of Austria, covering all nine regional associations and offering resources on licensing, operating modes, contests, and technical information. Visitors can find band plans, contest calendars, QSL card services, satellite radio info, and news about events like HAM RADIO Friedrichshafen and the organization's 100-year anniversary.
https://qsl.net/kb1ckf/ham_radio_links.htm
Mike (KB1CKF) has assembled a comprehensive ham radio links page covering SATERN emergency communications chapters, Massachusetts amateur radio clubs, ARRL resources, repeater directories, and major radio equipment manufacturers. A handy reference for New England amateur operators, with particular emphasis on emergency radio networks and local clubs in the Eastern Massachusetts area.
http://phy6.org/stargaze/Sintro.htm
Created by Dr. David P. Stern, 'From Stargazers to Starships' is a comprehensive web-based textbook covering astronomy, Newtonian mechanics, the Sun, and spaceflight at a high school level. The site includes glossaries, timelines, Q&A sections, lesson plans, and supplementary materials for educators, making it a rich self-contained learning resource with a strong historical perspective.
http://curiousskywatcher.blogspot.com/
The Curious Skywatcher is a dedicated astronomy blog offering monthly celestial highlights, including planet positions, meteor showers, and sky-watching tips for amateur stargazers. Posts guide readers on locating stars and planets with the naked eye, making it a friendly and practical resource for anyone wanting to explore the night sky.
https://bcbirdalert.blogspot.com/
BC Rare Bird Alert is a community birding blog tracking rare and unusual bird sightings across British Columbia, Canada, with detailed location reports, maps, and observer notes. Each post documents a specific rare species encounter, making it an invaluable real-time resource for birdwatchers and ornithology enthusiasts in the Pacific Northwest.
http://choisser.com/packet
Larry Kenney (WB9LOZ) presents an 18-part introductory series on packet radio, originally written in 1988 for the San Francisco Amateur Radio Club newsletter and revised multiple times through the 1990s. The series covers everything from basic concepts and TNC commands to BBS usage, node networks, and the National Traffic System, making it a comprehensive self-study guide for amateur radio operators interested in packet operations.