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://www.qsl.net/ac6xi
AC6XI's personal amateur radio homepage, featuring a link to a how-to page and contact information for this licensed ham operator. The site is sparse but serves as a basic online presence for the callsign AC6XI, with promises of future updates.
http://bitxhacks.blogspot.com/2017/10/raduino-as-nbfm-tx.html
BITX Hacks is a technical blog by Ashhar Farhan focused on modifications and experiments with the BITX40 amateur radio transceiver boards and Raduino controller. This post walks through a clever 30-minute hack to turn the Si5351 clock generator into a narrow-band FM transmitter using a varactor diode and a simple audio amplifier circuit, complete with Arduino sketch code.
http://wadenaham.org/
The Wadena Area Amateur Radio Club serves ham radio enthusiasts in the Wadena, Minnesota region, providing a community hub for local operators. This club site connects members and promotes amateur radio activity in the area.
http://lunar-occultations.com/iota/iotandx.htm
The International Occultation Timing Association (IOTA) is a scientific organization dedicated to observing, timing, and reporting occultations and eclipses, including lunar grazes and asteroid occultations. The site serves as a comprehensive hub with prediction tables, observing guides, software tools like LiMovie and KIWI-OSD, and regional sections spanning Europe, the Middle East, India, Australasia, and East Asia.
http://cometography.com/
Cometography.com is a scholarly reference site originally built by Gary W. Kronk, companion to his six-volume Cambridge University Press book series, offering in-depth historical data on periodic and notable comets throughout history. Now maintained by José J. Chambó, the site preserves and expands Kronk's decades of comet research for astronomers and enthusiasts alike.
https://clarc.org/
The Clear Lake Amateur Radio Club (CLARC), operating under callsign K5HOU, has served the Clear Lake, Texas area since 1987 as an ARRL Special Service Club. Visitors can find information about weekly nets on the club's repeaters, licensing exams, Hamster Classes, and community communications support for public events.
https://qsl.net/kc4gzx/kc4gzx/project.htm
KC4GZX is a sprawling amateur radio and electronics resource by a Georgia ham operator, featuring over 2100 DIY homebrew projects spanning antennas, amplifiers, transmitters, microcontrollers, lasers, and more. It also includes a Northeast Georgia ham directory, repeater listings across multiple southeastern states, and a hamfest schedule, making it an invaluable hub for regional and hobbyist radio enthusiasts.
https://rigpix.com/index.shtml
RigPix is a comprehensive reference database featuring information, specifications, and photographs of ham radio and shortwave receiver equipment from hundreds of manufacturers including Icom, Kenwood, Yaesu, Hallicrafters, Heathkit, and many more. With thousands of entries spanning vintage and modern transceivers, scanners, and accessories, it serves as an indispensable rig reference for amateur radio operators and SWL enthusiasts alike.
https://skokievalleyastronomers.org/
The Skokie Valley Astronomers was a beloved Illinois-based amateur astronomy club that ran for over 50 years, hosting public meetings, presentations, and events dedicated to stargazing and sky watching. The site serves as a farewell archive and resource hub, featuring newsletters, images, and links to other local astronomy clubs for members and enthusiasts to continue their passion.
https://umass.edu/rso/hamradio
The official homepage of the UMASS Amateur Radio Club (callsign W1PUO), a student-run club at the University of Massachusetts Amherst founded in 1996 by College of Engineering students. The club offers a shared radio shack, licensing classes for prospective hams, and public service events open to all five-college university students, faculty, staff, and their families.