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://rfcafe.com/
RF Cafe is a comprehensive resource for RF and electronics engineers, offering formulas, reference data, vintage magazine archives, software tools, forums, and a massive parts and services directory. Running since 1996, the site blends technical depth with nostalgia, featuring scanned articles from classic publications like QST, Popular Electronics, and Radio-Craft alongside modern engineering utilities.
http://n0hr.com/
N0HR.com is a hub for amateur radio operators, offering PocketPC ham radio software including MobileLog 2 for contact logging, PPCMorse for learning Morse code, and PocketDigi for digital modes like PSK31 and RTTY. The site also features a large curated and user-rated ham radio links directory, HF propagation tools, a DXPedition map, and a blog covering tower projects, contests, and DX activity.
http://wa3key.com/collins.html
WA3KEY's Virtual Collins Radio Museum, created by Norman Drechsel, catalogs the full range of Collins Radio Company amateur equipment from 1946 through 1995, with individual pages for transmitters, receivers, transceivers, and accessories. A rich reference for ham radio collectors and restorers, the site also includes advertisement archives, parts and service vendor listings, and collector club resources.
https://pbcskywarn.com/
PBCSkywarn is the official site for Palm Beach County's Skywarn severe weather spotter network, coordinating volunteer storm spotters across South Florida in partnership with the National Weather Service. Visitors will find repeater frequencies for ham radio weather nets, real-time radar links, Storm Prediction Center outlooks, and National Hurricane Center resources covering the entire South Florida region.
https://eskimo.com/~oolon/wwdxc
The Western Washington DX Club (W7DX) is a ham radio club based in the Pacific Northwest, offering members access to DX bulletins, contest calendars, propagation forecasts, QSL bureau info, and a newsletter called the Totem Tabloid. The site includes meeting announcements, officer rosters, club bylaws, and links to regional ham radio clubs and resources throughout the 7th call area.
http://fishpool.org.uk/
G4WIF shares a growing archive of home construction projects for amateur radio enthusiasts, covering topics like antennas, attenuators, and QRP test equipment. The site also references a co-authored book on simple test equipment for QRPers, with years of archived articles dating back to 2016.
https://epanorama.net/
Tomi Engdahl's ePanorama.net is a vast electronics reference site covering audio circuits, video systems, PCB design, embedded systems, RF, and much more, with hundreds of categorized links and original schematics. The accompanying blog keeps the resource current with news, product tests, IoT coverage, and cleantech topics, making it a go-to hub for electronics hobbyists and engineers alike.
https://sagan.diletante.net/
A fanlisting dedicated to the beloved astronomer and science communicator Carl Sagan, gathering fans from around the world who admire his work and legacy. Built and maintained by a fan known as C.:., the site includes information about Sagan, membership listings, and links to related resources.
https://www.qsl.net/gara
GARA (Greater Area Radio Association) hosted its club site on QSL.net, featuring repeater listings, member rosters, and information about joining the group. The file index reveals pages covering multiple frequency bands (50, 144, 222, and 440 MHz) along with affiliations with ARES, RACES, SKYWARN, and ham radio webrings typical of late-1990s amateur radio club sites.
http://ssastros.org/testsite
The South Shore Astronomical Society is a community astronomy club bringing together stargazers and space enthusiasts in the South Shore region. This appears to be the club's official web presence, serving as a hub for members and those interested in joining a local astronomical society.