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://solarpower.guide/
Bob Robertson's hobby site is a sprawling reference on solar power, covering everything from basic definitions and how solar panels work to educational guides for kids and van-life solar setups. With dozens of articles on renewable energy topics, it reads like a one-man encyclopedia built by a retiree passionate about the subject.
http://weather.uwyo.edu/upperair
Hosted by the University of Wyoming's Atmospheric Science department, this site provides access to real-time and historical upper air data including soundings, upper air maps, and balloon trajectory forecasts for the US and Wyoming. It's a go-to reference for meteorologists, students, and weather enthusiasts needing professional-grade atmospheric data.
http://hamuniverse.com/antennas.html
Hamuniverse.com, run by N4UJW, is a comprehensive ham radio resource site with a dedicated Antenna Design Lab offering hundreds of antenna projects, designs, and build guides for amateur radio operators. Visitors can browse antenna types by band, explore digital modes, study for license exams, and tap into a wide range of technical articles covering everything from repeaters to emergency power.
https://qsotoday.com/podcasts
QSO Today is a long-running weekly podcast hosted by Eric, featuring in-depth interviews with amateur radio operators covering topics from homebrew transmitters and vintage gear to SDR, contesting, and DXpeditions. With over 535 episodes archived and a searchable episode list, it's an invaluable audio resource for ham radio enthusiasts at every experience level.
http://currentsky.com/
Bob Riddle's 'Qué tal in the Current Skies' is a long-running amateur astronomy site that began in the late 1980s as posts to the Big Sky Telegraph BBS and evolved over 30+ years into a web resource covering Earth and Space topics. The site now serves as a transitional landing page pointing visitors to his continuing work on Substack, with archived daytime and nighttime sky photos, calendar data, and astronomical observations.
https://pskreporter.info/
PSK Reporter is a real-time propagation reporting network for amateur radio digital modes, collecting reception data from operators worldwide to show where signals are being heard. Built by Philip Gladstone, it supports modes like FT8 and PSK31, offers map displays and statistics, and even contributes data to ionospheric research and government licensing investigations.
https://qsl.net/ucc
The Ukrainian Contest Club (UCC) is a ham radio organization dedicated to amateur radio contesting in Ukraine, with a notable HamFest event from 2002. The site uses a frames-based navigation system typical of early 2000s web design, suggesting a club hub with member resources and contest information.
https://www.qsl.net/kb9ocq/index.html
Dale Catron (KB9OCQ) built this ham radio personal page focused on the 2-meter band, featuring antenna specs, repeater information, and a dense collection of links covering equipment brands like Icom, Yaesu, Kenwood, and Alinco. The site also includes FCC rules, online practice exams, ARRL resources, and participation in multiple amateur radio webrings from the late 1990s.
https://qsl.net/n9zia
Green Bay Professional Packet Radio (GBPPR) is a Wisconsin-based amateur radio and electronics research group with working divisions covering RF design, packet radio, signal interception, and open-source hardware projects. The site is a deep technical resource featuring homebrew RF amplifiers, spectrum analyzers, frequency transverters, wireless data links, and a long-running zine packed with experimental electronics content.
https://eznec.com/
EZNEC is a widely used antenna modeling and analysis software package created by Roy Lewallen (W7EL), now available for free as EZNEC Pro+ v7.0. The site provides downloads, documentation, FAQs, and detailed information about the software's NEC-based calculation engines for modeling antenna radiation patterns and wire configurations.