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://yarc.org/
The Yonkers Amateur Radio Club (W2YRC) is a New York-based ham radio club affiliated with the ARRL, featuring repeater frequencies, EchoLink and WiresX node info, and a full calendar of events including Field Day, fox hunts, and VE testing sessions. Members and visitors can find meeting schedules, study guides, software resources, a photo gallery, and membership renewal options all in one place.
https://pierplates.com/
Dan's Pier Top Plates is a small business site selling custom mounting hardware for backyard telescopes, including pier top plate systems, DIY telescope enclosures, and adapters for metal piers. Hobbyist astronomers looking to build a permanent concrete or metal telescope pier for a home observatory will find products, FAQs, and installation guides here.
https://tube.be/
A specialized reference guide cataloging the vacuum tube types used in shortwave radio broadcast transmitters, organized alphabetically and numerically for easy lookup. The site also lists manufacturers, rebuilders, and distributors worldwide, including companies like Thales, Eimac, Penta Laboratories, and Xuguang, making it a practical industry directory for broadcast engineers.
http://jouscout.com/astro/belmont/belmontd.htm
A detailed double star catalog organized by constellation, compiled by the Belmont Society, listing star pairs with their right ascension, declination, separation, and color descriptions. The catalog is notable for its emphasis on the visible colors of stars, with evocative notes on hues like yellow, blue, orange, and even elusive green, making it a useful observing reference for amateur astronomers.
https://www.qsl.net/races
The national web presence for the Radio Amateur Civil Emergency Service (RACES), a program coordinating licensed amateur radio operators for emergency and disaster communications across the United States. Maintained by Ken Bourne (W6HK) since 1997, the site covers FCC RACES rules, news, volunteer protection information, and links to local RACES groups nationwide.
http://w9az.com/
The Kankakee Area Radio Society (KARS) is an Illinois-based amateur radio club dedicated to promoting and advancing ham radio in the Kankakee region. The site features member resources including meeting schedules, repeater information, fox hunt events, archived newsletters, and a membership application.
https://w9smc.com/
The Society of Midwest Contesters (SMC) is a club uniting amateur radio operators across the Midwest who compete in radio contesting events, with resources covering membership, awards programs, VHF contesting, and call area records. The site features a championship medals leaderboard, annual SMC Fest gathering details, contest calendars, and a contesting library making it a hub for competitive ham radio operators in the region.
http://marcmvra.net/
The Mankato Area Radio Club (MARC) has served amateur radio operators in southern Minnesota since 1954, and this official site provides meeting details, repeater frequencies, local net schedules, and VE testing information. A great resource for hams in the Mankato region looking to connect with a local club or find area frequency programming.
https://his.com/~jrusso/ham.html
Jim and Karen's joint ham radio page for callsigns W4KRN and K4JJR features their station setup, ham radio links, and a reference to the Dayton 2000 hamfest. The site also participates in the Amateur Radio Webring and includes a local weather widget for Warrenton, Virginia.
https://www.qsl.net/nx0g
The Mountain Amateur Radio Club (MARC) is a ham radio club based in Teller County, Colorado, serving local amateur radio enthusiasts in the region. This page is a redirect notice pointing visitors to the club's new home at nx0g.org, with very little remaining content at this location.