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The details of the spark gap transmitter and its history: how it was invented, developed and used.

Article on propagation basics. The ground wave used for radio communications signal propagation on the long, and medium wave bands for local radio communications

A short introduction to amateur radio portable operations bu VKFAQ.

All the essentials about the Dip Meter or Grid Dip Oscillator used for many RF measurements including detecting resonance, locating RF emissions, and making many RF measurements.

overview of radio signals and radiowave propagation and how different areas of the atmosphere affect radio communications.

Descriptions, summaries,and tutorials about electronic circuits and electronic circuit design including amplifiers, attenuators, logic, transistor, operational amplifiers and much more

Amateur radio antennas manufacturer based in Italy. Produces HF end-fed, dipoles, and other wire antenna types, mono band and multi band antennas.

ARRL Affiliated Special Services Club open to all who are interested in the hobby of amateur (HAM) radio communications.

Mircules HAM QuickLog provides a mobile logging solution for amateur radio operators, supporting quick contact entry on iOS and Android platforms. It features multiple log file management, instant callsign information display including Country, ITU zone, CQ Zone, and DXCC number, and robust ADIF and CSV import/export capabilities. The application is designed for efficient logging with optional fields and default values, streamlining the process for both shack and field operations. The software includes dedicated support for POTA, SOTA, and IOTA activations through specific fields like MY_SIG_INFO, SIG_INFO, MY_SOTA_REF, IOTA, and MY_IOTA. A specialized contest mode offers real-time dupe checking and automatic TX exchange updates to enhance contest efficiency. Integration with QRZ.COM and HAMQTH.COM allows for direct operator information lookup and import, while Open Street Maps integration provides geographic context for contacts. The application also features a notes and scratchpad function for each log file.

Presents the Carolina DX Association's (CDXA) _Contest Corner_, a dedicated resource for amateur radio contesting activities. It features a curated contest calendar, linking to external resources such as the _WA7BNM Contest Calendar_ and the _ARRL Contest Calendar_, providing a broad overview of upcoming events. The page also details CDXA's internal contest programs, including the "CDXA DX King" and "CDXA DX King Classic" for 2026, with specific links for members to submit their scores. Furthermore, the resource integrates with _3830Scores.com_, encouraging CDXA members to submit their contest results and select the club affiliation for tracking. It provides a direct link to view aggregated scores from participating CDXA members, fostering club competition and recognition. The "CDXA Periodic Table of Contest - 2026" is also mentioned, indicating a structured approach to contest planning for the year.

The I2YSB DXpedition Team presents a collection of videos documenting their past DXpedition activities. These visual records offer insights into the operational aspects, equipment deployed, and environmental conditions encountered during various DXpedition events. The resource also contains a specific announcement regarding the cancellation of the planned Ghana AF-084 DXpedition, originally scheduled for April. It further details the refund process for sponsors who had contributed donations for the cancelled operation. The content serves as an archive of DXpedition experiences, showcasing the efforts involved in activating rare or challenging entities. It provides a historical perspective on the team's operations and logistical considerations. The site also functions as a communication channel for important updates concerning future or cancelled DXpedition plans, directly addressing the amateur radio community interested in their activities.

Article on how to use logic analyzers for testing complex logic-digital circuits

Introduction to troposcatter or tropospheric scatter propagation using the troposphere

AmTOR may be considered as the next development from RTTY. AmTOR was introduced to overcome the problems with RTTY. As a result of its performance, it has become popular on the HF bands because it gives more reliable communication, especially when interference is present. It achieves this by using a coding system that allows errors to be detected and corrected.

An introduction to develpment of morse keys in radiotelegraphy history

How to limit unwanted harmonics from your raspberry Pi radio transmitter by introducing filters.

Licence types in Australia and How to get a licence.

Introduction to packet radio and answers to common questions about this digital mode and about services you can use by VKFAQ

Visual Wais is a free HAM (Amateur Radio) software to manage WAIS (Worked All Italian Squares) award. With few clicks, it allows the complete award management, from QSO insertion to endorsement requests.

Volunteer Amateur Radio operator organization providing emergency communications services to charitable events and in large scale disasters.

Harleys, Astronomy, HAM Radio, and other stuff

The Pro 95 is a dual trunking handheld scanner designed by GRE and sold by Radio Shack

The High Point Amateur Radio Club (HPARC), operating under the callsign W4UA, provides a central hub for amateur radio enthusiasts in High Point, North Carolina, and surrounding communities. The club's website outlines its long-standing traditions and civic service, which date back to the 1930s, highlighting its sustained leadership and strong membership support over decades. It serves as a resource for individuals interested in obtaining or upgrading an FCC amateur radio license, offering assistance through direct contact with club officers. The site also features a newsletter archive for meeting notices and information on club activities, including Field Day. HPARC's diverse membership shares a common interest in the amateur radio hobby, encompassing various aspects such as VHF, UHF, HF, and digital modes like D-STAR. The club's commitment to public service is evident through its involvement in ARES and Skywarn, alongside educational initiatives for new hams and those pursuing license upgrades. The site also lists repeaters and provides information on emergency communications, technical projects, and participation in events like DXCC and contests, reflecting the broad interests of its members.

QRP amateur radio & stuff by Adrian YO4HHP

Article descrive the different types including coax and open-wire feeder and waveguide.

An extensive document about Morse Code in amateur radio edited by W5ALT

A Web forum dedicated to HF underground and in particular to Shortwave Pirate Radio Forums and Spy Numbers listenings

Key details about the superhet or superheterodyne radio reeiver: basic overview; how it works; applications; design notes, all you need to know.

Microwave band plan - frequancy assigned to ham radio service

Amateur radio in cartoon type TV shows, Simpsons, Southpark, Family Guy, SpongeBob

This FM wireless mike can transmit voice signals to any FM Radio receiver 100 meters away.

an overview, introduction or tutorial about the basics of electronics filters including the types of filter and the various filter design considerations and parameters

Article about tropospheric propagation and the way in which radio signals at VHF and above propagate over greater distances than strictly line of sight in the troposphere

Article cover hints and tips on ham radio or amateur radio contesting and contests

Ham or amateur radio is a fascinating hobby for all

The National Digital Link Cisar CisarNet Project

Resource page for the ICOM IC-R75 at RadioReference

The radio beacon DI2AM on museum-ship in Rostock Schmarl

An article on how to measure electrical current with a digital multimeter or analogue multimeter.

Read all the key details about Vacuum Tubes or Thermionic Valves that provided the foundations for today's electronics technology.

About usage of DTMF Dual Tone Multi Frequency in ham radio applications

Generate APRS Passcode using PHP for use in Amateur Radio APRS Applications when connecting to the APRS-IS Network

This quick-start guide is an attempt to provide some help when coming to terms with the R20 and the manual

How test transistors and diodes with a simple digital multimeter.

What are the Differences between UV5R and UV82 Series

GM4YEQ Galashiels and District Amateur Radio Society (GDARS)

Stand Alone Software Defined Radio, direct sampling receiver from 30 kHz to 1700.00MHz continuous frequency range, LAN interface for remote access

RadioReference page on Radio Shack Pro-97