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://stellafane.org/
Stellafane is the historic home of the Springfield Telescope Makers of Vermont, hosting one of the oldest and most celebrated amateur telescope making conventions in the world. The site offers comprehensive guides on building Dobsonian telescopes and grinding mirrors, a rich archive of convention history, an astrophoto gallery, and resources for beginners getting started in amateur astronomy.
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://n8ara.org/
The Newark Amateur Radio Association (N8ARA) serves ham radio enthusiasts in central Ohio, providing a community hub for licensed operators in the Newark area. Visitors can learn about club membership, meetings, and local amateur radio activities in the region.
http://wa0h.com/
Jerry Gentry (WA0H) offers MicroLog, a free ham radio logging program with built-in callbook integration for Buckmaster Hamcall, RAC CD, and QRZ. The site also sells a math book and programming book authored by Jerry, making it a compact but practical resource for amateur radio operators.
https://qsl.net/cemarc
CEMARC (Council of Eastern Massachusetts Amateur Radio Clubs) is the ARRL-affiliated umbrella organization representing the ham radio community across Eastern Massachusetts, with delegate clubs meeting quarterly to coordinate activities. The site covers club member interests, on-air nets, Field Day information, local club listings, and the council's history dating back to its founding memo.
https://radio-ware.com/
Radioware is a hobbyist catalog and bookstore supplying antennas, cables, and accessories to amateur radio, scanner, and shortwave listeners. It serves as a one-stop shop for radio enthusiasts looking for gear spanning ham radio, CB, and SWL equipment.
https://wb4aej.com/hamdomain
WB4AEJ's Ham Domain is a comprehensive amateur radio resource built around a massive directory of ham radio operator websites, organized by callsign. Beyond the directory, the site covers special events stations, callsign lookups, fox tone sequences, and links to major organizations like ARRL, AMSAT, and TAPR.
http://icstars.com/HTML/SolarSection/HAlpha/OBSERVINGTHESUNHAlpha1.html
David Knisely's comprehensive H-Alpha handbook covers solar observation in remarkable technical depth, with dedicated sections on prominences, sunspot group classification, solar flares, and a full glossary of H-Alpha terminology. Part of the larger ICSTARS Astronomy site, this resource is a serious reference for amateur astronomers interested in observing the sun through hydrogen-alpha solar filters.
https://qsl.net/dx100dx
DX100DX is the official site for a special event amateur radio station operated from Batangas City, Philippines, celebrating the 100th anniversary of Philippine independence from Spain during the 1998 CQ Worldwide DX Contest. The joint venture between the Mabuhay DX Group, Philippine DX Foundation, and the Philippine Amateur Radio League includes contest logs, DXpedition photos, QSL card info, and an online WebLogBook.
https://www.vkham.com/
VKHam is a comprehensive Australian amateur radio resource hub run by VK2CA, featuring over 12,000 QSL card images, a directory of 1800+ VK callsigns, repeater maps for all Australian states, and an extensive electronics and kit manual library. Visitors can look up VK callsigns, browse DX information, access frequency and Morse code references, and even post classified ads for ham radio equipment.