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://nobarc.org/
The Northern Berkshire Amateur Radio Club (NoBARC) serves approximately 150 licensed ham radio operators in Berkshire County, Massachusetts, with repeaters positioned atop Mount Greylock at 3,500 feet providing coverage across a 250-300 mile radius. The site features meeting schedules, DXpedition presentations, repeater information, license classes, field day results, and resources for new hams.
https://atmos.uw.edu/marka/ca.normals.html
Hosted on the University of Washington's atmospheric sciences domain, this page presents California's observed climate normals for the 1971-2000 period, including mean monthly precipitation and daily maximum and minimum temperatures. Visitors can click on map markers to explore station-level climate data across the state, making it a handy reference for researchers, students, and weather enthusiasts.
http://andrewscom.com.au/
Andrews Communications is an Australian retailer specializing in marine radio, telescopes, binoculars, scanners, CB radio, and test equipment. The shop serves customers across Australia with a broad range of optical and electronic communication products.
https://qsl.net/ka0loo
The Webster County Amateur Radio Club (WCARC) out of Fort Dodge, Iowa maintains this late-1990s club homepage covering membership info, meeting calendars, local repeater details, and ham radio resources. The site includes officer contacts, a classified market for used equipment, links to ARRL and QRZ, and even a sample license exam for prospective hams.
https://www.qsl.net/n5tle
Kelly Kohls (N5TLE) shares his amateur radio interests alongside a collection of DMX512 electronics projects built around the PIC16F876 microcontroller, including source code, hex files, schematics, and functional descriptions. The site is a practical resource for anyone interested in DMX512 lighting control interfacing with analog voltage converters using PIC microcontrollers.
http://k0bg.com/
K0BG is a comprehensive amateur radio resource run by Alan Applegate, focusing heavily on mobile ham radio installations, antenna theory, and RF bonding techniques. The site is packed with detailed technical articles, diagrams, and practical guidance that make it a go-to reference for hams interested in operating from vehicles.
https://batc.org.uk/
The British Amateur Television Club (BATC) is the world's largest organization dedicated to Amateur Television (ATV), covering everything from digital TV transmission and microwave amplifiers to live video streaming and vintage camera restoration. Members enjoy access to a forum, wiki, YouTube channel, technical handbooks, contests, and an annual UK convention bringing together ATV enthusiasts from around the globe.
http://starrywonders.com/
Steve Cannistra's StarryWonders is a deep-dive into astrophotography, featuring stunning CCD images of nebulae and galaxies alongside detailed technical guides on subexposure time, binning, CCD cooling analysis, and bicolor Ha/OIII processing. The site is a treasure trove for serious amateur astronomers, combining a rich image gallery with spreadsheets and tutorials that go well beyond typical hobbyist pages.
https://www.qsl.net/la5ki/org.htm
LA5KI hosts an extensive photo archive of vintage ham radio equipment, organized by manufacturer and spanning dozens of classic brands like Collins, Hallicrafters, Heathkit, and Hammarlund. With over 60 images catalogued across rare and iconic mid-century radio manufacturers, this site is a visual treasure trove for vintage radio collectors and enthusiasts.
http://k1kkm.org/
K1KKM is a personal amateur radio operator's site identified by the distinctive callsign in the domain name. Though the page text is minimal, the callsign format strongly suggests a ham radio enthusiast sharing their station and hobby activities.