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A microprocessor based interface designed to go between a standard Morse code key and a radio transmitter. The circuit receives a signal from the key, processes it, and re-transmits it to the radio.

Software Defined Radio, QIRX is 64-Bit software, based on TCP/IP raw data, running with any RTL-SDR dongle being driven by rtl-tcp.exe.

G6LVB beginners guide to receiving the AO-40 beacon

The OCFD Off-Center-Fed Dipole Antenna is an excellent multiband antenna that is relatively simple to construct, yet gets quite decent performance.

AA5TB portable station for 30 meter QRP operations

Amateur radio station c31lj andorra 28.256 MHz

An article on the restoration of a Gates Radio M-5078 Commercial HF AM transmitter by John LeVasseur, W2WDX

Cambridgeshire England Direction Finding group

This article is about two excellent small helical antennas for the two meters band. With performance close to that of full sized antennas, these small helical antennas are low in profile but high in efficiency.

Some technical information for on Opto Isolation, Transformer Isolation, Surge Protection

Online log for TX7T DX pedition from Marquesas

The Yota 2015 official facebook group

Over 100 distinct RF connector types are available from AIR802, including popular UHF series PL-259 plugs and SO-239 sockets, designed for a wide array of coaxial cable dimensions. The company specializes in producing connectors compatible with common amateur radio cables like RG-8, RG-213, and RG-58, ensuring reliable signal integrity for antenna systems and shack interconnections. Their product line extends to various coaxial cable types and pre-made antenna cable assemblies, offering ready-to-deploy solutions for hams. AIR802 also provides custom cable assemblies and pigtails, catering to specific installation requirements for transceivers, tuners, and amplifiers. These pre-fabricated options simplify station setup, reducing the need for field termination of connectors. Michael Bryant is the contact for inquiries regarding their range of RF components, which are essential for building robust and efficient amateur radio stations.

Introduction to ham radio with nice selected pictures and amateur radio history by VK5SW

JTAlert provides several audio and Visual alerts for WSJT-X & JTDX software. JTAlert generate audio and visual alerts for several alert conditions, logs automatically to several ham radio log books software like hrd dxkeeper,log4om, interoperates with web services and it supports dxlab suite.

The website for the Northern California Amateur Radio Kids Group.

Cubical Quad Antenna On-line Calculator helps on defining the size of each element and spreader. Simply give the resonating frequency and it will calculate size of each element.

A little gadget was found in an article in QST, made with 1 pair of powerpole connectors a resistor and two leds

Information and download page for the CQ/X GPS-enabled logging program for mobile operation in amateur radio state and regional QSO parties by N05W

KB6NU web log

The Kenwood TM-D710 is designed as a nearly fully self-contained APRS station, with the ability to perform most of the common APRS functions built right in.

An overview about the UHF connectors often referred to as the PL259 plug and SO239 socket used for many RF applications. Limitations, history and soldering properly UHF Connectors

Why build antennas out of copper and not aluminum or stainless steel. Selecting the best metals for antennas evaluating the conductivity factor.

The Tektronix digital multimeter is a feature-rich tool with the accuracy and precision you need for your most demanding measurements.

News of Ham radio in the world

Operating Free DV, the open source digital voice codec for HF, allows any SSB radio to be used for low bit rate digital voice.

Software running on the Raspberry PI, Control up to 8 arduino rotators modules, Azimuth maps, Cluster support, Band decoder, contest Web Log, Webcam with RaspiCam support

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

A resource page for Kendoowd TS-850 HF transceiver

Amateur Radio Full Disclosure

Delta Electronics Manufacturing, a global manufacturer, specializes in _RF connectors_, adapters, and cable assemblies, providing custom interconnect solutions with superior performance. Their Advanced Vertically Integrated (AVI) global facilities emphasize efficiency, quality, flexibility, and cost control across their product lines. The company serves diverse industries, including broadcast and audio, test and measurement, military, aerospace, and public safety communications. For instance, Delta supplies RF interfaces for military aircraft, satellite launch vehicles, and missiles, maintaining a long-standing QPL supplier status. Their field-tested RF interconnects are also crucial for two-way radios, base station equipment, and antenna systems in public safety applications, ensuring reliable performance in critical communication infrastructure. Delta's solutions extend to commercial aircraft and semiconductor manufacturing, where their RF interconnects power etch equipment, deposition equipment, and chip testing systems worldwide.

A 70 cm yagi antenna design by YU7EF includes tables with antenna elements dimension and spacing. This UHF Yagi antenna plan provides a maximum gain of 17.93 db

DX Pediton to South Georgia VP8SGI Log Online IOTA AN-007

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

Designer and manufacturer of RF amplifiers used in a variety of custom applications in many diverse industries - from Scientific, Medical, Industrial, and Communications and Broadcast.

This is a standard calculation method that can help you while tuning dipole antennas, by adjusting wire lengths. This method can be used also when you need to add lenght to your wires, and can be additionally used to quarter waves vertical antennas

An interesting article dedicated to hams that want to start learning morse code, including notes on Methodology, online training tools, and a guide to Morse Keys

All about the joy of amateur radio communications

Ham radio club Decatur Illinois

Troop I, Region 2 - Live Audio Feed Web Player

Located in Upstate New York, specialize in unusual surplus equipment, mostly of military origin.

Elecraft K1 & K2 PCB scanned top & bottom, for troubleshooting

A website for college and university amateur radio clubs to showcase themselves, work together, and promote amateur radio. Alumni and interested people can learn more about what college and university amateur radio clubs are doing.

A technical article that want to explain Coaxial Cable terms, specifications and applications. A glossary of technical terms with clear explanations.

The video delves into the fascinating science behind antennas, which are crucial for receiving and transmitting electromagnetic waves. It explains how antennas convert electric signals into electromagnetic waves for transmission, and how they operate through the oscillation of positive and negative charges in dipole arrangements. Practical antenna implementations, such as dipole antennas for TV reception and Yagi-Uda antennas with reflectors and directors, are also discussed alongside modern dish TV antennas with parabolic reflectors for signal processing. It's a comprehensive overview of how antennas work and their significance in communication technology.

The PI6ATV repeater, operating on 10.475 MHz, serves the amateur television community by providing both analog and digital DVB-S2 services. Recent updates include user-adjustable Symbol Rate settings via Webcontrol, allowing operators to optimize their digital ATV transmissions for various conditions. This functionality, implemented on December 13, 2022, enables dynamic configuration of the digital stream. Significant technical milestones include the return of the analog ATV transmitter on 10.475 MHz, featuring a newly constructed liquid-cooled final amplifier by Edwin PD2EBH. This restoration on September 6, 2020, followed an 18-month hiatus, ensuring continued support for traditional analog ATV enthusiasts. The repeater's transition to DVB-S2 modulation, initiated on December 20, 2018, addressed capacity limitations of the previous DVB-S setup. This change from 20 MS/s with FEC 3/4 to DVB-S2 allowed for more efficient data handling, accommodating multiple channels within the available bandwidth and enhancing the overall digital ATV experience.

Transmitting operations in the 50-54 MHz range offer some unique problems that over the past 50 years have stymied station owners, forcing them to tolerate quiet hours and hostility from family and neighbors attempting to enjoy other electronic services.

9J2T dx pedition to Zambia 2014 by IDT

Shortwave listening web site from Brazil

Since 2011, crkits offer radio kits that you cannot find on eBay or AliExpress. Includes HT-1A 20/40m Dual Band CW Transceiver Kit, D4D DSB Transceiver Kit for Digital Mode, R3500D ARDF Receiver, CW Transceiver Kit