Science & Nature
1439 sites
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- Astronomy & Space (396)
- Chemistry (8)
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- Biology (79)
- Physics (30)
- Mathematics (59)
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- Amateur Radio (682)
- Electronics (47)
https://sarts.org.sg/
The Singapore Amateur Radio Transmitting Society (SARTS) is the national organization for ham radio enthusiasts in Singapore, offering resources on licensing, frequency bands, and getting started with amateur radio. The site features news posts on topics like FreeDV signals, web SDRs, and satellite launches, along with a marketplace, gallery, and membership information for the local ham community.
https://marsradio.org/
Branson Repeaters serves the Missouri Ozarks Tri-Lakes area with a network of linked ham radio repeaters on 2 meters, 1.25 meters, and 70 cm, plus digital nodes connecting YSF, DMR Brandmeister, AllStarLink, and EchoLink. The site provides repeater frequencies, coverage details, hosted net schedules including a Skywarn Youth net, and local Branson weather from NOAA.
https://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2017Aug21Tgoogle.html
Fred Espenak's NASA Eclipse Website hosts an interactive Google Maps tool showing the precise path of totality for the August 21, 2017 total solar eclipse, including central line, northern and southern limits, and 10-minute interval markers. Hosted by NASA's Goddard Space Flight Center, the page provides detailed data on greatest eclipse, greatest duration, lunar limb profiles, and eclipse weather resources.
https://bangladeshtornadoes.org/mytornadochases/mychases.html
Jonathan D. Finch documents his storm chasing expeditions from 1993 to the present, with detailed accounts of each chase including target areas, driving routes, and close encounters with tornadoes across the Great Plains. A fascinating firsthand record spanning decades of severe weather pursuit, complete with photos captured from video footage and narrative logs of near-misses with significant tornadoes.
http://web.ticino.com/wlog2000/wlog
WLOG2000 is a ham radio logbook software project by Swiss operator HB9OAB, offering a professional Windows-compatible logging application for amateur radio, CB, SWL, and BCL operators. The site features software downloads, Yaesu transceiver reviews, DXpedition logs, and the WASL Lakes Award program, making it a rich resource for the ham radio community.
http://smallwonderqrp.blogspot.com/2019/04/fiero-compact-qrp-ssbcw-transceiver.html
K.P.S. Kang's blog dedicated to QRP (low power) radio transceiver design, featuring detailed technical write-ups on homebrew SSB/CW transceivers like the FIREO, which uses an innovative FM limiter circuit for speech compression. A must-read for ham radio enthusiasts interested in minimalist radio construction and RF engineering theory.
https://www.qsl.net/w6ka
The W6KA Pasadena Radio Club is the official web presence for a California-based amateur radio club serving the Pasadena and Altadena area. The page serves as a gateway to the club's main sites and connects visitors to the Amateur Radio World Ring webring network.
https://hamstudy.org/
HamStudy.org provides free amateur radio exam preparation tools including flash cards, practice tests, and full question pools for Technician, General, and Amateur Extra licenses. Supporting international qualifications from the US, Canada, Argentina, Mexico, and New Zealand, it is one of the most comprehensive online study platforms for aspiring ham radio operators.
https://wm7d.net/hamradio
WM7D dot Net is Mark A. Downing's extensive amateur radio link directory, organized into dozens of categories covering antennas, DX clusters, propagation, QRP, Morse code, satellite info, and much more. With five pages of curated links spanning everything from ARRL headquarters to shortwave and six-meter sites, it serves as a comprehensive reference hub for ham radio enthusiasts.
https://www.qsl.net/evarc
The Elkhorn Valley Amateur Radio Club (EVARC) serves ham radio enthusiasts in Norfolk, Nebraska, with meeting schedules, repeater frequencies, club nets, and licensing test sessions. Maintained by Monty Wilson NR0A, the site also links to propagation tools, ARES registration, local hamfest info, and nearby radio clubs across Nebraska.