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://zl2ctm.blogspot.com/2025/01/40m-pelican-case-ssb-trabsceiver.html
Charlie Morris (ZL2CTM) documents his amateur radio homebrew experiments, including this detailed post on building a 40m SSB transceiver housed in a Pelican case, complete with Arduino code for the Si5351 VFO and LCD control. The blog covers hands-on RF construction projects with schematics, code snippets, and supporting YouTube videos, making it a great resource for homebrewers interested in building their own transceivers.
http://mistisoftware.com/astronomy/index.htm
Misti Mountain Observatory is an amateur astronomy site featuring stunning astrophotography captured with a 32-inch Ritchey-Chretien telescope in Arizona, covering galaxies, nebulae, star clusters, and solar system objects. The site includes detailed equipment notes, film and CCD imaging data, conference listings, and even a specialized app that lets blind and visually impaired users explore astronomical images through musical tones.
https://m1hax.uk/
Richard M1HAX documents his Summits on the Air (SOTA) activations across Britain and beyond, combining amateur radio operating with serious hiking and mountaineering in places like Wales, Scotland, and Malta. The site features detailed activation reports, technical guides like building a LoRa APRS tracker for off-grid position tracking, and a log of radio contacts made from mountain summits.
https://www.qsl.net/cpra
The official web presence of the C.P.R.A. (Confraternidad Puerto Rico Amateur), a Puerto Rican amateur radio organization led by President Miguel Lopez (WP4HDH), offering news, member resources, and links to FCC and ARRL. The site includes proclamations for Amateur Radio Day, net schedules, membership applications, and licensing exam information for Puerto Rico.
https://www.qsl.net/w3sz
Roger Rehr's W3SZ page is a long-running amateur radio site hosted on QSL.net, active from 1997 to 2007. The callsign W3SZ and the QSL.net hosting strongly indicate a ham radio enthusiast's personal presence on the web.
http://hamradio.de/
Hamradio.de is a German-language community hub for amateur radio enthusiasts, offering a fleamarket for used equipment, forums, contesting resources, club directories, and software. With sections dedicated to awards, DX, and contests, it serves as a comprehensive gathering point for the German-speaking ham radio community.
https://ve7sar.blogspot.com/
The digital home of the SARC Communicator, the newsletter of Surrey Amateur Radio Communications (VE7SAR) based in Surrey, BC, Canada. Each issue is packed with homebrew projects, DX expedition reports, radio history features, and equipment reviews, making it a rich resource for ham radio enthusiasts of all experience levels.
http://qrp.gr/index.htm
SV3ORA is a Greek amateur radio operator's personal site packed with original electronics projects, HF radio circuit designs, and hands-on repair guides for classic gear like Tektronix oscilloscopes, Collins radios, and Heathkit equipment. The site features hundreds of projects spanning antenna designs, tube circuits, QRP transmitters, and vintage test equipment restoration, all presented in classic Web 1.0 style.
https://affy50.tripod.com/Eyepcalc.html
An interactive eyepiece calculator for amateur astronomers that computes magnification and true field of view based on telescope focal length and aperture. It includes a comprehensive built-in database of eyepieces from major brands like Celestron, Meade, Pentax, Vixen, and Zeiss, plus support for custom eyepiece data entry.
https://hamqsl.com/
Paul Herrman (N0NBH) built this comprehensive resource for ham radio operators tracking HF propagation conditions, offering free solar-terrestrial data widgets, banners, and tools that can be embedded in any website. Visitors will find online calculators for SFI/SN conversion, K-Index to signal noise, Aurora latitude tools, MUF/LOF prediction maps, and live solar flux and sunspot data updated every few hours.