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://www.qsl.net/sra
The Sierra Radio Association's former web presence, now redirecting visitors to their new home at k6sra.org. This amateur radio club page serves as a forwarding notice for members and ham radio enthusiasts looking to connect with the organization.
http://n5hq.com/
N5HQ is the personal ham radio site of an Extra Class operator licensed since 1978, covering SSTV, DSSTV, QSL cards, antenna design tools, and amateur radio licensing resources. The site also highlights the operator's involvement as an ARRL Volunteer Examiner, Skywarn weather spotter, and Ten-Ten International member.
https://w0ne.org/
The Winona Amateur Radio Club (WARC) is an ARRL-affiliated club based in Winona, Minnesota, founded in 1945 and serving local ham radio enthusiasts with repeaters, nets, and emergency preparedness resources. Visitors will find club news, event calendars, QSL card verification tools, a remote station, SKYWARN information, and membership details.
https://k3ltc.com/
Nate Berry's personal amateur radio page serves as a virtual QSL card for callsign K3LTC, a General class operator based in New York's FN30mu grid square. The site details his involvement with the Suffolk County Radio Club, activity on 2 meter and 70 centimeter bands, and even features an image transmitted via SSTV.
http://jgiesen.de/astro/english.htm
Created by J. Giesen, this rich astronomy resource features interactive Java applets for computing solar and lunar positions, planetary visibility, eclipses, sunrise/sunset tables, and much more. Standout features include a top-rated GeoAstro Applet Collection, detailed coverage of the Venus transits and Mars oppositions, and tutorials on astrophysics topics like stellar formation and the Saros cycle.
http://uksmg.org/content/deadband.htm
Written by Palle Preben-Hansen (OZ1RH), this technical article explains how radio amateurs can make long-distance contacts on the 50MHz (Six Meter) band by exploiting meteor scatter propagation even when the band appears dead. It covers meteor trail geometry, shower timing, diurnal and seasonal meteor rate variations, and practical operating techniques, with supporting figures and links to software and IARU procedures.
https://www.qsl.net/la5ki/index.htm
LA5KI Vintage Ham Radio is a Norwegian amateur radio operator's site dedicated to vintage ham radio equipment and history. The page features a classic old-web aesthetic and serves as a gateway to content about antique radio gear and the amateur radio hobby.
https://cedar-astronomers.org/
Cedar Amateur Astronomers (CAA) is an astronomy club based in the Cedar Rapids, Iowa area, hosting regular public programs, monthly business meetings, and stargazing events at their Pal-Dows Observatory. The site provides event schedules, Zoom recording links for past programs, a clear sky chart, and resources through affiliations with the Astronomical League and the Night Sky Network.
https://rmastro.com/
The Roper Mountain Astronomers (RMA) is a South Carolina astronomy club dedicated to sharing observational skills and astronomical knowledge with enthusiasts of all levels. The site features member astrophotos, club event listings, star parties, outreach programs, and highlights the historic 23-inch Charles E. Daniel Observatory refractor telescope.
https://warc1.org/
The Wichita Amateur Radio Club (WARC) has been serving Kansas ham radio enthusiasts since 1932, making it one of the longer-running amateur radio clubs in the region. The site features news about Field Day operations, repeater information, licensing resources, and club activities including visits from Wichita's mayor during Amateur Radio Week.