Amateur Radio
682 sites
https://repeater-builder.com/
Repeater Builder is a dedicated resource for amateur radio enthusiasts focused on building, modifying, and maintaining repeater systems. The site dives into the technical side of ham radio infrastructure, making it a go-to reference for hobbyists who want to construct or upgrade their own repeaters.
https://qsl.net/gi4fum
David Hutchinson's personal homepage from County Antrim, Northern Ireland, featuring his amateur radio callsign GI4FUM and participation in the Amateur Radio World Ring webring. The site also touches on Antrim District Scouts, archery sports injury resources, and related links, making it a snapshot of a multifaceted Northern Irish hobbyist's online presence.
http://rfinq.com/
RF Inquiry Inc. is a Japanese company specializing in amateur and professional radio equipment, selling filters for RFI interference suppression, antennas from brands like OptiBeam and OM Power, and accessories for HF, VHF, and UHF operation. The site serves ham radio operators with a product catalog including bandpass filters, baluns, linear amplifiers, and noise reduction gear from well-known manufacturers.
http://james.ahlstrom.name/pcr1000
James Ahlstrom shares his Python-based control software for the Icom PCR-1000 wideband radio receiver, covering the full 100 kHz to 1.3 GHz tuning range. The page includes setup instructions for Windows and Linux, download links for dependencies like pyserial and pywin32, and a practical explanation of how PC-controlled radio software works.
https://region6armymars.org/resources/solarweather.php
Region 6 Army MARS consolidates critical solar weather data for HF radio operators, including ionospheric critical frequency (foF2), maximum usable frequency (MUF), K-Index readings, solar X-ray flux, and proton flux from GOES satellites. The site serves as a practical reference for Army MARS members needing real-time propagation data to assess HF communication conditions.
https://amrad.org/
AMRAD, the Amateur Radio Research and Development Corporation, is a technical ham radio club based in Fairfax, Virginia, focused on cutting-edge projects like weak signal detection, low frequency (LF) experimentation, software-defined radio (SDR), and spread spectrum research. The site serves as a hub for members and enthusiasts alike, featuring project documentation, newsletters, forums, and meeting information for this long-running research-oriented amateur radio organization.
https://www.qsl.net/brvarc
The Black River Valley Amateur Radio Club serves Lewis County, New York, connecting local ham radio enthusiasts with the Northern New York Section of the ARRL. The page is a minimal stub that redirects visitors to the regional ARRL section website for club news and information.
https://www.qsl.net/dl4mea
Günter Köllner (DL4MEA) shares his extensive ham radio station based near Munich, Germany, with a focus on VHF, UHF, SHF, and EME (Earth-Moon-Earth) communication across multiple bands from 144MHz up to 5760MHz. Nearly all of his equipment is homemade, and the site details his rigs, antennas, worked squares maps, and beacon operations including the experimental beacon DB0FAI.
https://swling.com/blog
The SWLing Post is a richly detailed blog dedicated to shortwave listening, ham radio, DXing, and all things radio, run by Thomas and a community of contributors. Visitors will find equipment reviews, broadcast schedules, numbers station reports, SDR guides, and news spanning pirate radio to vintage receivers.
https://trac.org.tr/
TRAC (Türkiye Radyo Amatörleri Cemiyeti) is the official national amateur radio society of Turkey, founded in 1962, serving licensed ham radio operators across the country with regional chapters and representatives. The site offers callbook lookups, VHF/UHF contest results, QSL bureau services, repeater information, EchoLink and APRS guides, and resources for obtaining an amateur radio license in Turkey.