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://kellysky.net/
Al Kelly's dedicated astrophotography site showcases stunning CCD images of galaxies, nebulae, star clusters, and solar system objects captured with equipment including a Celestron CGE 1400 telescope and Orion Parsec 8300C camera. Beyond the image galleries, the site offers a CCD instruction manual, a G2V color calibration article, and links to fellow astrophotographers, making it a valuable resource for amateur astronomers interested in CCD imaging.
https://ento.csiro.au/biology/fly/fly.html
Developed by CSIRO Entomology researchers, this anatomical atlas provides detailed visual and educational reference material covering the morphology of flies (Diptera), originally built in Flash and converted to HTML in 2023. A collaboration between CSIRO and ABRS, it includes identification keys and anatomical glossaries for fly families found in Australia, making it a valuable tool for entomologists and biology students alike.
http://blog.marxy.org/
Peter Marks (VK2ZZC) runs this long-running blog blending amateur radio experimentation, particularly FreeDV digital voice modes, with regular technology commentary for ABC Radio's Nightlife program. Visitors will find net reports, homebrew radio projects, and tech takes on AI, Apple, and social media policy alongside links to the amateur radio community.
http://dfma.org/
The Durham FM Association (DFMA) is an amateur radio club based in Durham, North Carolina, serving members across the Research Triangle Area with repeaters, monthly meetings, and public service activities. The site covers club events, repeater information, newsletters, ARES/AUXCOMM support, and Field Day activities, making it a central hub for local ham radio enthusiasts.
https://www.qsl.net/k9ona
The Six Meter Club of Chicago (SMCC) is a Chicago-area amateur radio club promoting activity across HF, VHF, and UHF bands, with a focus on six-meter operations, emergency communications, and community radio services. The site lists 2020 meeting dates, net schedules including a Tuesday ragchew net on 50.130 MHz USB, a Two Meter FM Info Net, and a Thursday Digital SSTV net using EasyPal software.
http://sss-mag.com/smith01.html
SSS Online is a long-running RF and spread spectrum engineering magazine offering deep technical resources on Smith charts, S-parameters, impedance matching, Eb/N0, and link budgets. Managed by Pegasus and active since 1995, it serves RF engineers and ham radio enthusiasts with articles, software downloads, tutorials, and reference material on microwave and wireless design topics.
https://m0pqa.com/
Pablo (M0PQA) runs this technical amateur radio blog covering hands-on projects like firmware recovery, AllStar node modifications, APRS gateways, and packet radio on Raspberry Pi. The posts are detailed and practical, making it a valuable reference for hams tackling real-world station challenges.
http://hffax.de/
Marius Rensen's HF-FAX site is a comprehensive resource covering HF radio fax reception, weather satellite imagery, SSTV, NAVTEX, and related amateur radio reception technologies. Based in Hannover, Germany, the site features live weather cams, satellite passes, software guides, hardware listings, and a rich history section tracing early facsimile pioneers.
https://costajulio.tripod.com//cv/astronomy.htm
Julio Costa shares his lifelong passion for amateur stargazing, recounting memorable early encounters with telescopes and the purchase of a Celestron 8-inch Schmidt-Cassegrain reflector. The page includes personal photos of the moon and Jupiter with its moons, accompanied by warm, humorous writing about the joys and quirks of backyard astronomy.
https://www.qsl.net/oz1gmq/hamlinks.htm
A sprawling directory of ham radio operator homepages from around the world, maintained by OZ1GMQ and featuring hundreds of links to individual amateur radio stations, clubs, repeater listings, and related resources. Visitors will find connections to emergency preparedness groups like RACES and ARES, regional radio clubs, and a wide variety of personal ham radio pages spanning multiple countries and call signs.