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Building the Three-Element Hex Beam. A project and construction phase of an HF hex-Beam antenna using trees to hang the antenna and a Channel Master antenna rotator.

With the new name TRANSRADIO, the former TELEFUNKEN SenderSysteme AG enters into the new digital age of Broadcasting – DRM.

Electronic Kits manufacturer, produce the Penntek TR-45L QRP Transceiver and the TR-25 CW Transceiver Kit

Miscellaneous ham radio stuff from K2DBK

Focused on technology to serve emergency response in clackamas county, oregon.

Effect of radials on the efficiency of antennas.

Drake TR-7 A.M. Transmit Filter Modification

An universal antenna tuner interface, the Kenwood Remote LDG Tuner Interface by af6sa

Receivers and transmitters by Collins , Drake , Hallicrafters , Hammarlund , National Receivers

RF Wattmeters - RF Power Measurement - Bird Wattmeters Telewave - Coaxial Dynamics Wattmeters - Daiwa Wattmeters

Build a digital AC voltmeter to measure the output range from 0 to 150VAC with reasonable accuracy

HM-36 Modification to make it work with an IC-7200 and the IC-7600

Monitoring extremely weak signals in the QRSS (Very Slow Morse) mode requires specialized receiving and processing capabilities to extract information below the typical noise floor. This project provides a software solution, _QrssPiG_, designed to run on a Raspberry Pi, enabling it to function as a dedicated QRSS grabber. It interfaces with various Software Defined Radio (SDR) devices, including the popular _rtl-sdr_ dongles and _HackRF_ units, to acquire raw I/Q data streams. The software then performs the necessary signal processing to visualize and decode these faint, long-duration CW transmissions, often operating with milliwatts of power. The system leverages the computational power of the Raspberry Pi for real-time signal analysis, allowing hams to participate in QRSS experiments and monitor distant beacons. It supports different SDR hardware, offering flexibility in setup and deployment for home stations or remote monitoring sites. The project includes detailed instructions for installation and configuration, making it accessible for those familiar with Linux environments. This grabber is particularly useful for tracking propagation on the LF and HF bands where QRSS activity is common, providing a visual representation of signal presence over extended periods.

G6LVB beginners guide to receiving the AO-40 beacon

Past and current operations dedicated to St. Maximilian Maria Kolbe (SP3RN)

Barest of bones APRS RF position reporter using a Raspberry Pi B+, USB GPS receiver, Baofeng UV-5R, and a mono 3.5mm audio cable between the Pi and the radio

You can shorten a vertical antenna by using a loading coil. This online calculator tells you how the amout of inductance your loading coil will need to have.

A non profit organisation run entirely by volunteers to promote Low Power Radio.

Amateur Radio Operator since April of 2005. My time as a Technician was primarily spent working for the community and various organizations to provide Emergency Communications. I originally became a ham to work DX but found enjoyment volunteering for the local community.

Founded in 1990, Nearson, Inc. has been providing our customers with exceptional value with the products and services we offer. VHF, UHF mobile radios, Cellular, PCS equipments as well as ISM band wireless data and WLAN applications.

F4FAP maintains a useful listing of current saltellites that are on the air and that can be easily heard and worked.

Examples of absorbtive low-pass filters in which the unwanted high-frequency energy is separated from the wanted output and then dissipated in matched resistors

VP8O South Orkney 2011 DXpedition January 27 to February 8, 2011

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

CE9/VE3LYC and CE9/PA3EXX Wollaston and Diego Ramirez Islands 2011

The wire antenna described in this page provides much stronger signal strength while staying within the concept of a dummy load antenna.

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.

The N0QBH QRSS project page, a couple of projects using available kits for improved frequency and timing stability. A configurable DDS VFO 100mW transmitter with LCD display and a modified Hans Sommers 40m 100mW transmitter

Manufacture capacitors, sensors, diodes, varistors, chokes, inductors, ferrites and accessories

This paper discusses the sources of feed line currents and the methods used to control them.

H44G Log Online Solomon Islands Temotu Islands

KiwiSDR Software-defined receiver at Bjargtangar Iceland covering HF Bands

Realization of confortable communications. RF Filters

Amateur Radio Full Disclosure

Metal products manufacturer for Grounding, cable management, surge arrestors, tower accessories, Coax standoff arms for telescoping towers, Safety stand tower platform, Mast steps, tower installation tools

Mike Delta Victor Dx Group Spain

This is a page to detail how I remotely operate my Elecraft K2 HF transceiver via my home network. The method used should apply to pretty much any amateur transceiver that can be controlled by serial port.

SDR++ is a cross-platform, open-source SDR software designed for minimal bloat and ease of use, supporting Windows, Linux, macOS, and BSD operating systems. It incorporates multi-VFO capabilities and offers extensive hardware compatibility through both _SoapySDR_ and dedicated modules. The software features SIMD accelerated DSP for efficient signal processing and provides full waterfall updates when possible, which enhances signal browsing. Its modular design facilitates the development of custom plugins, allowing users to extend its functionality. The application's focus on a bloat-free architecture and user-friendly interface aims to simplify the experience of working with Software Defined Radios. The full waterfall update mechanism is particularly beneficial for visualizing and identifying signals across a wide frequency spectrum, improving operational efficiency for radio amateurs. The modular plugin system enables community contributions and specialized enhancements, making _SDR++_ adaptable for various amateur radio applications, from general listening to specific digital mode decoding.

AA5TB portable station for 30 meter QRP operations

Distribute Coax Cables and Connectors for VHF UHF and Microwave

CIS Prefix Suffix (Oblast) List at KARC

Cambridgeshire England Direction Finding group

Official Kenwood memory control program for TM-V71A / TM-V71E TM-D710A / TM-D710E RC-D710

LZ Open Contest Club - free membership, event's calendar, compare logs online

How N1GY built his ride for Amateur Radio.

All about the joy of amateur radio communications

A prototype of a switch foot made on a square aluminium stock frame

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

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

Signal-to-noise ratio is defined as the ratio between the desired signal, and the background noise. In this article, SNR is explained in the deep