Science & Nature
1439 sites
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- Astronomy & Space (396)
- Chemistry (8)
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- Biology (79)
- Physics (30)
- Mathematics (59)
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- Amateur Radio (682)
- Electronics (47)
http://lists.contesting.com/_3830
The 3830 mailing list archives preserve decades of amateur radio contesting discussion, spanning from 1996 through 2023. Operators and contesters can browse monthly threads or search the full archive to find score postings, contest strategies, and community conversation going back nearly 30 years.
https://www.qsl.net/wb0ydi
David E. Koopman (WB0YDI) shares his ham radio shack page, featuring links to callsign databases, ARRL, AMSAT, SSTV resources, and FCC exam practice. A Minnesota-based Extra Class licensee and St. Paul Radio Club member, Dave also includes a jukebox feature and QSL card information for fellow operators.
http://pactor.com/
Phil Sussman (N8PS) runs this dedicated resource covering PACTOR, a digital HF radio mode, including news, updates, and reflections on its declining use among amateur radio operators. The site features hardware reviews of SCS PTC TNCs, links to logging software, and candid commentary on the state of digital amateur radio communications.
http://rudius.net/oz2m/taclog
OZ2M's TACLog is a dedicated page for amateur radio contest logging software, likely developed by the Danish ham radio operator behind the OZ2M callsign. Visitors interested in contest operating and logging tools for amateur radio will find this a focused technical resource.
https://naqcc.info/
The North American QRP CW Club (NAQCC) is a free-to-join nonprofit organization dedicated to promoting low-power amateur radio operation using Morse Code and simple wire antennas. Members can participate in contests, sprints, challenges, and CW nets, with resources to help hams of all skill levels improve their CW speed and proficiency.
http://users.marktwain.net/aschmitz/home.html
KB0YKI's Radio Zone is Aaron Schmitz's amateur radio resource featuring antenna building hints, gamma match plans, repeater building guides, and online tools like a Yagi designer and J-Pole designer. The site also includes a QSL card maker, regional scanner frequencies, and a repeater map, making it a handy reference for ham radio hobbyists.
https://aa9pw.com/
AA9PW.com is an amateur radio practice site built by operator AA9PW to help aspiring hams pass their FCC license exams and learn Morse code. It features customizable online practice tests, a Morse code generator, and a companion iPhone app called Ham Morse for on-the-go CW practice.
http://gothosenterprises.com/black_holes
Jillian's Guide to Black Holes is an informal yet thorough educational resource originally written as a university physics project at Syracuse University, covering black hole formation, classifications, accretion disks, Hawking radiation, wormholes, and how to locate black holes across the universe. Written by Jillian in an approachable, conversational style, it stands out for its careful citations, multilingual reach (including a Basque translation), and years of ongoing updates beyond its academic origins.
https://handprint.com/ASTRO/bortle.html
A detailed reference page explaining the Bortle Dark Sky Scale, which measures night sky light pollution across nine categories from inner-city skies to pristine darkness. The site includes an adapted table of Bortle's indicators with color codes used in light pollution maps, plus five star charts covering key sky areas visible from the continental United States.
http://rvasclub.org/
The Roanoke Valley Astronomical Society (RVAS) is a Virginia-based astronomy club offering monthly meetings, observing sessions, newsletters, and astrophotography resources for members. The site includes clear sky charts, a DSO of the month feature, member pages, and meeting announcements with guest speakers covering topics like astrophotography techniques.