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://101science.com/Radio.htm
A comprehensive free electronics and electrical engineering reference hub covering everything from basic electricity and Ohm's Law to advanced RF design, DSP, amateur radio, and circuit simulation. With hundreds of curated links, formulas, tutorials, data sheets, and calculators organized across multiple phases of learning, it serves as a structured self-study guide for electronics enthusiasts and engineers alike.
https://voyager.neocities.org/
Laika's Lonely Planet is a space-themed personal site that invites visitors to drift into the cosmos, named after the famous Soviet space dog Laika. The landing page sets an atmospheric, starry tone with its retro web aesthetic, promising a fuller experience on desktop with JavaScript enabled.
https://www.qsl.net/k/ka5rtf//narc
The Neshoba Amateur Radio Club (N.A.R.C.) serves ham radio operators in Neshoba County, central Mississippi, hosting a Sunday night net on the N5EPP repeater at 147.330 MHz. The site lists 2005 club officers, links to callsign lookup services like QRZ and Buckmaster, and connects visitors to local and regional radio nets.
http://butikov.faculty.ifmo.ru/Projects/Collection.html
Created by physicist E. Butikov of IFMO, this collection presents interactive Java applets simulating remarkable three-body gravitational motion problems, including the famous figure-eight periodic orbit and restricted three-body scenarios. It bridges classical Newtonian mechanics and celestial mechanics with hands-on simulations suitable for students and advanced researchers exploring planetary system dynamics.
http://wb6noa.com/
WB6NOA appears to be the personal amateur radio site of a licensed ham operator, identifiable by the callsign-based domain name. The site uses a frames-based layout typical of early web design, suggesting a hobbyist page dedicated to ham radio activities and interests.
http://johncath.force9.co.uk/radio%20projects.htm
John Cath's radio project pages feature detailed amateur radio construction projects including a 17-page guide to building a 600W 50MHz solid state amplifier and a power splitter for 70cm. The site reproduces designs from RadCom magazine and the Radio Society of Great Britain, making it a useful reference for ham radio builders and experimenters.
https://k3lr.com/
K3LR is the homepage of Tim Duffy's world-class amateur radio contest station, featuring a multi-operator, multi-transmitter setup that has been featured in QST, RadCom, and the Spectrum Monitor. The site showcases Team K3LR's competition activities, sponsored equipment from Icom and DX Engineering, and links to Dayton Contest University events.
https://c2a.astrosurf.com/english/information.htm
C2A is a feature-rich planetarium software created by Philippe Deverchere, designed for both amateur and professional astronomers who need precise astrometric and photometric capabilities. The site documents the software's extensive support for star catalogues including Hipparcos, Tycho-2, and UCAC4, as well as deep sky object catalogues, asteroid and comet tracking, and tools for predicting occultations and sunrise/sunset times.
http://ve7sl.blogspot.com/2026/02/recent-630m-fun.html
Steve (VE7SL) runs this amateur radio blog chronicling his homebrewing projects and on-air adventures spanning frequencies from 2200m to nanowaves. Posts dive deep into technical topics like 630m band operations, antenna construction, and propagation experiments, making it a fascinating read for hams interested in the MF/LF frontier.
https://wz5bbs.com/radio
WZ5BBS is the amateur radio station page of an Amateur Extra class licensee, cataloging an impressive shack setup including Icom, Kenwood, and Yaesu radios alongside Diamond and Chameleon antennas. The site tracks APRS iGate activity, multiple logbooks like POTA and Logbook of the World, fox hunting events, and club memberships with the Oak Hill and Austin Amateur Radio clubs.