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://amsatnet.com/
The Houston AMSAT Net, run by KK5DO (Bruce Paige), is a weekly amateur radio net focused on satellite communications, meeting Tuesday evenings at 8PM Central and accessible via multiple repeaters and digital linking systems. The site covers AMSAT awards programs, satellite operator achievements, field day history, and resources for ham radio operators interested in communicating through amateur satellites.
http://edsradio.com/
Ed's Radio (AA6ED) is a comprehensive amateur radio resource focused on the Greater Los Angeles Area, covering local clubs across four counties, VHF/UHF nets organized by day, licensing exams, and swap meets. The site also includes educational content on basic electronics, Morse code, Q codes, and band plans, making it a handy reference for both new and experienced hams in Southern California.
http://rxcontrol.free.fr/
A technical hobbyist site focused on shortwave listening, featuring custom hardware designs using PIC microcontrollers, RTTY decoders, HF receiver control software, and digital decoding tools built by the creator. Visitors will find schematics, software downloads, and detailed projects spanning everything from RS-232 adapters to ADS-B decoders and frequency standards.
https://pzk.org.pl/news.php
The Polish Amateur Radio Union (Polski Związek Krótkofalowców) is the largest national organization in Poland dedicated to amateur radio communication and satellite radio services. The site serves as the official hub for PZK members, featuring weekly bulletins, news updates, a callsign lookup database, and organizational resources in both Polish and English.
https://electronbunker.ca/eb/Links.html
A curated links page from the Electron Bunker site, gathering forums, personal pages, and resources dedicated to crystal radios, homebrew radio building, and vintage vacuum tube electronics. Regularly maintained and updated, it helpfully flags disappeared sites with Wayback Machine archives so enthusiasts can still access classic content.
http://azastronomy.com/
Richard D. Jacobs, M.D. shares his CCD astrophotography captured from his backyard in Chandler, Arizona, showcasing diffuse nebulae, galaxies, star clusters, planetary nebulae, and solar system objects despite significant light pollution. The site also covers the technical side of amateur CCD imaging including astrometry, spectroscopy, and photometry, making it a useful resource for urban amateur astronomers.
https://jedaler.tripod.com/elec.html
Jedaler's Electronics Page, built by JaKab-Daniel, is a curated link collection focused on circuit schematics, microcontrollers, RF antennas, robotics, and hobby electronics projects. Visitors will find references to PIC microcontroller resources, Tesla-related circuits, xenon flash designs, and free energy machine plans alongside general electronics archives.
https://www.qsl.net/evarc
The Elkhorn Valley Amateur Radio Club (EVARC) serves ham radio enthusiasts in Norfolk, Nebraska, with meeting schedules, repeater frequencies, club nets, and licensing test sessions. Maintained by Monty Wilson NR0A, the site also links to propagation tools, ARES registration, local hamfest info, and nearby radio clubs across Nebraska.
https://a.atmos.washington.edu/~ovens/loops/index.loop.html
Hosted by the University of Washington's Atmospheric Sciences department, this tool provides animated weather graphics loops covering radar composites, surface observations, satellite imagery, and forecast model outputs for the Pacific Northwest and beyond. Visitors can customize loop duration and location, making it a practical reference for anyone tracking regional weather patterns in real time.
http://ve7sl.blogspot.com/
VE7SL is Steve's amateur radio blog chronicling his homebrewing projects and on-air adventures across an extraordinary range of frequencies, from 2200 meters all the way up to nanowaves. Posts dive deep into technical details like antenna construction, low-band operating on 630m, and solar propagation data, making it a rich resource for experimentally-minded hams.