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)
http://russsscope.net/staxtutorial.htm
A beginner-focused step-by-step tutorial for stacking and processing planetary images using the free software Registax, written by an astrophotographer who uses a Meade DSI Color camera. The guide walks through alignment, optimization, stacking, and wavelet sharpening in plain language, making it accessible to newcomers who find other tutorials too vague.
http://cactus-intertie.org/
The Cactus Intertie System is a private UHF amateur radio network established in 1971, spanning large portions of the American Southwest and beyond through a web of remotely controlled base stations linked by full duplex RF. Run by Cactus Intertie, Inc., a 501(c)(3) nonprofit, the site covers membership, affiliate clubs, technical support, educational materials, and the network's extensive history across multiple states.
http://magicrepeater.net/
The official web presence of M.A.G.I.C. (Minnesota Amateur Group of Independent Communicators), a ham radio club operating multiple repeaters across the St. Paul, Hugo, Foreston, and North Branch areas of Minnesota. Visitors will find repeater frequency details, band plans, ham radio links, scanner resources, shortwave links, DMR network info, and announcements for club tailgate events.
https://lcra.org.co/
The Liga Colombiana de Radioaficionados (LCRA) is Colombia's national amateur radio organization, founded in 1933 and serving as a member society of the IARU. The site covers licensing procedures, reciprocal license applications, frequency bands, club history, diplomas, and official resolutions for Colombian ham radio operators.
https://www.qsl.net/n1pce
John N1PCE runs the Northern New Hampshire AllStar Network, a linked repeater system spanning Whitefield and Groveton with VHF/UHF nodes and a DMR BrandMeister connection on Cannon Mountain. The site lists node frequencies, CTCSS tones, ASL node numbers, and a weekly 'North Country Weather Net' schedule for amateur radio operators in the north country region.
http://w1mx.mit.edu/
The MIT Radio Society (W1MX) is America's oldest college amateur radio station, a student-run club at MIT focused on RF engineering, telecommunications, and radio science. The site covers membership info, meeting schedules, club history, ham exam resources, balloon programs, and a capital campaign to build a new station.
http://citynight.com/camera
Robert W. Swan's pioneering live telerobotic internet camera, mounted atop an antenna tower at Amateur Radio Station WA6ZJG in Alameda, California, has been running continuously since June 1995. Visitors can remotely aim the camera left or right and watch live street-level views of the San Francisco Bay Area, making it one of the earliest publicly controllable webcams on the internet.
https://metrocor.net/
MetroCor is the Metropolitan Coordination organization for amateur radio repeaters covering New York City, New Jersey, and surrounding counties, maintaining an extensive database of coordinated frequencies across bands from 10 meters through 23 centimeters. The site publishes detailed repeater coordination tables listing hundreds of callsigns, output and input frequencies, PL tones, and coordination status for the greater NYC metro area.
http://srgclub.org/
Karl Shoemaker (AK2O) runs this ham radio resource dedicated to the SRG Club's 147.20 MHz repeater network covering Eastern Washington and Northern Idaho, with linking to Seattle. The site dives into technical repeater building topics including flat audio, operational amplifiers, PCB work, receiver audio boards, and repeater controllers.
https://qsl.net/wa5mc
The Atchafalaya Amateur DX Association Inc. (AADXA) is a ham radio club based in Amelia, Louisiana, with a full organizational presence including officer listings, membership applications, meeting minutes, newsletters, and repeater information. Developed by Guy R. Morrison (WA5MC), the site also features field day photos, a guestbook, and club constitution documents, making it a solid hub for local amateur radio enthusiasts.