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Installing the optional TCXO, named SO-3 in the Kenwood TS-590S by TK5EP

Wirelesss Institute of Australia

Relay substitution tutorial, power amplifier tuning and Technical Characteristics

Ham Radio ITU International Callsign Country Prefixes

W5UXH version of OZ1JHM Morse Code decoder project

Adam Brown's Blog from Latitude 80.19 South Longitude 81.16 West

Conductor is a training tracking software that can organize any type of education, training, certification or license. It generates a multitude of reports perfect for regualtory bodies, free demo.

Ham Radio cartoons of common situations

Windows signal function generator sotfware, offers 4 main channels, 4 modulators, 1 measurement generator, 1 frequency standard generator, Amplitude, phase and frequency modulation, can generates real band-limited signals

ex 9q5hx, s79hx, 4l1hx, 4k1hx, 4j0/ik2bhx, j3/k2bhx, 4u0g, operator at IR4T, J3A, 4U1ITU, 4U1UN

Radio Cubana by Instituto Cubano de Radio y Television official site

iOS EchoLink client, this free app will allow licenced ham radio operators to use iPhone, iPad or iPod devices to connect to the echoLink system and connect to repeaters or other echolink users.

Meetings Schedule, study groups, circulars from the radio communication division at ITU

Brevard County, Florida, USA

MS Excel document that allows you to plot SWR, resistance, reactance, impedance magnitude and angle and more from a variety of sources

Non-profit public foundation dedicated to providing research and educational access to optical and radio astronomy. Located in Rosman, North Carolina.

QRZ.com Free app for iPhone iPad let you search the QRZ.COM call sign database from your mobile device. Completely free with no subscription required.

Depiction mapping software can download and integrate maps, elevation plots, weather data, situation reports, damage assessments, volunteer movement, and more. It interface with your APRS ssystem

Friis-It NF is the first iPhone OS based application that allows you to calculate noise figure, system sensitivity, and cascaded gain for an RF Receiver system

Arizona near space research - promoting science and education by exploring frontiers in amateur radio and high altitude balloons.

A 10.4-meter diameter, submillimeter spectrum telescope. Situated at the top of Mauna Kea, Big island, Hawaii.

What constitutes the ideal 28MHz beacon from the listener's perspective by G0AEV

Balloon Projects, scheduled launches at amsat

OK0EU is short-wave QRP beacon set up by the OK QRP Club and supported by the Institute of Atmospheric Physics of the Academy of Sciences of the Czech Republic (UFA).

New York City Amateur Radio Emergency Communications Service (NYC-ARECS) is a NYC based auxiliary communications service. The organization is made up of amateur radio operators who are trained and dedicated to providing radio communications for governments, civil-preparedness and relief agencies during periods of local, regional, or national civil emergencies. This may include situations such as power failures, explosions, fires, floods, earthquakes or terrorist activities. NYC-ARECS is a participant in the NYC Office of Emergency Management (OEM) Partners in Preparedness program and a member of DHS FEMA's National Preparedness Coalition.

Students interested in HAM activities at Indian Institute of Technology, Bombay.

Info on 2013 Icom recall for IC-7100 for touchscreen replacement and N-Connector substitution with SO-239 by PD0AC

A selection of useful tables including DXCC country list , ITU countries, ISO country lists, by VE7CA

Canberra Region Amateur Radio Club (Formerly the Wireless Institute of Australia, ACT Division).

DX0DX dxpetition to Spratly Islands, Thitu Island 6th - 24th January 2011 IOTA AS-051 ITU 50, CQ 26 Multi national team

A free repeater database app for iPhone and iPad includes repeaters from 35 different countries and is available in 5 languages

Official aprs.fi iOS app, immediate real-time visibility to APRS traffic near you and around the world.

Display your current Maidenhead locator with 10 digit precision. It also computes bearing and distance to a set of target locations using locator or latitude / longitude. Useful to align antennas in VHF / UHF / microwave DX activities. No network or fancy maps usage, so it can be used even in remote locations.

A classic document originally presented in Proceedings of the Institute of Radio Engineers in 1937 and is, still today, the standard referenced by the FCC, text books and many amateur radio publications.

The K7ICU repeater system is situated about 500' above metro Tucson, at the base of the Catalina Mountains. It is an open system providing coverage to the greater Tucson area.

About Amplitude-Modulation

Show CQ and ITU Zone in an interactive clickable map based on google maps. Additional locator tool tip can be displayed by clicking on points, and a search function it is also available to locate addresses, and locators.

Amplitude Modulation Forever for ham radio operators, shortwave listeners and collectors

Greek Lighthouse Award has been instituted by the Northern Greece Contest Team and will be issued to any Ham Radio operator or SWL for QSOs with (or reports from) amateur radio stations operating from Greek's lighthouses.

A not-for-profit organizationn help locate an Installer, documentation, certifications

Magnetism is manifested as a 'field of vectors', that is, any point in the magnetic field has not only a magnitude, but a direction in space. The four Maxwell equations describe how electric and magnetic vector fields behave and interact.

Wireless Institute of Australia Awards program

Grid Calculator allows you to calculate either a grid square locator or the latitude and longitude of a location. Grid Calculator can be used to calculate a Great Circle bearing and distance between two stations in statute miles, nautical miles, and kilometers.

Contest station situated in the South West part of the Netherlands in the province of Zeeland

To promote and practice amateur radio and HAM radio in Mumbai, India.

Launch of a hybrid rocket from high altitude by untsville Alabama L5 Society

OpenHamClock is a modern, open-source dashboard for amateur radio operators, designed as a web-based successor to the original HamClock. Deployable locally on a Raspberry Pi or via the cloud, it centralizes essential DX operations into a single, intuitive interface. At its core is an interactive world map that visualizes real-time DX spots, signal paths, satellite tracking, and POTA activators. The software seamlessly integrates critical tools like WSJT-X, DX Cluster, and PSKReporter for monitoring digital traffic. Additionally, it provides vital environmental data, including real-time space weather indices, solar activity, and personalized HF propagation predictions. With customizable themes and a modular architecture, OpenHamClock offers modern operators comprehensive, at-a-glance situational awareness of global radio conditions

The official table of international Call Sign series published at the ITU Website

The RACES ARES Disaster Assistance Repeaters (RADAR) group was formed by a team of amateur radio operators dedicated to providing high quality repeater communications for amateurs involved in public service communications or response to emergency/disaster situations.