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A nice article expleraing why during the sunset it's possible to listen to long distance radio broadcasting stations.

VX-170 at rigpix

Links to CW related pages

April instrument, manufacturer of programmable microwave signal generators

This group is for support and discussion of the Baofeng UV-3R micro dual band VHF/UHF radio.

RF Samplers and demodulators

Founded in 1924 CSRA is one of the oldest ham radio clubs in the USA

Bill Turner dialcover site, dial cover replacements for antique radio restoration

A page describing how to setup a magnetic loop antenna with the DIY Magnetic Loop Starter Kit produced by Chamaeleon Antenna. Includes a video and a detailed instructions to setup.

Dubus article about DL6WU long yagi antennas for 23 cm band Article is both in german and english. Yagi antennas are valid alternative to dishes for troposcatter operations. This article explains design and mechanical data for 1296 MHz Yagi Antennas

Kootenai County's general interest club.

KTune is a small utility that allows you to use a Griffin Powermate USB knob to tune your Elecraft K3 radio.

PalmVE is a program for Palm based handheld computers that is built to aid as a virtual volunteer examiner for amateur radio written tests

How to restore conductivity to your rubber membrane buttons by KV5R

The richardson wireless klub is an arrl special service club of amateur radio operators based in richardson, tx, usa.

Russian military radio museum

Myths and information about ladder line by KV5R

TOEC was founded in 1991 by a bunch of contesters in Northern Sweden. The purpose of TOEC is to support contest related activities in as many ways as possible.

The purpose of this webpage is to document an attempt at this project starting with the 80m core receiver first and also having the parts on hand for then adding the first dual conversion band (40m)

Aerial 51 is an antenna manufacturer producing HF Wire antennas. Their antenna product catalog includes portable, OCF wire antennas for HF bands but also QRP transceivers, and accessories for portable operations.Based in Germany

Ham radio licencing in UK by RSGB

CT1FUI - Amateur Radio from Portugal , QSL card collection from 90's

ECARS began operation in 1968 as an Amateur Radio public service net for mobile operators on 7.255 MHz

The current EiBi shortwave radio schedules, contains an update aggregated list of radio broadcasting stations schedules. File is provided in text format and is availale to download for free.

Slovenia contest club EU HF Championship

Italian station operating mostly in QRP Mode, contain some interesting QRP projects for portable antennas and antenna mounts.

Old Cars and Amateur Radio. This club has a repeater on site of the World Longest Running car cruise. Part of the ARRG.US network

Always wanted to know what kind of sounds we hear, when listening to the radio? Here are some examples

RFE/RL Kyrgyz Service

A simple DIY signal generator based on NorCal QRP club kit

Amateur Radio, SkyWarn, RACES, ARES, and more

Online log NH8S Swains Island

VR-120 Commander is a windows programming software for the Yaesu VR-120 and VR-120D

Common problems of the 572B tubes often used in many RF Power Amplifiers

This project details the construction and testing of a M0PLK Delta Loop antenna for the 20-10m ham radio bands. Inspired by positive reviews highlighting its reduced local QRM compared to Cobweb antennas, the author built the antenna using aluminum tubes, DX-Wire FS2 wire, and a 1:4 balun. A mix of custom 3D-printed parts and careful assembly ensured stability and performance. Initial VSWR measurements met expectations, and test QSOs demonstrated success across multiple bands. Future enhancements include adding a lightweight, remote-controlled rotator for directional capabilities.

Hutchinson, MN

Web Page of the Fort Smith Amateur Radio Club

FreeDV plus Video adds simultaneous digital voice (FreeDV) to ZL2AFP's OFDM TV (see OFDM TV page listed under Software/SSTV and FreeDV page listed under Software/Digital Voice). An older version of OFDM TV is used, modified for compatibility with FreeDV. The video is 1 frame/sec, 36-lines, with full color. Total bandwidth is 3.5 kHz.

Read more about the purpose, policies, and procedures of The National Traffic System in this 48 pages PDF File

The cable testing approaches discussed in this article gives an idea about the electrical characteristics of a coaxial cable. Velocity of Propagation, Characteristics Impedance, Return Loss Measurement and more

A multiband Fan Dipole that works on 40 20 15 meters band, making a folded dipole for 7 MHz band and additional element for the 21 MHz and 14 MHz

The _Alessandro Volta RTTY Contest_ is an annual digital mode competition focusing on Radioteletype (RTTY) operation, challenging participants to make contacts across various HF bands. This event typically occurs in January, drawing a global field of operators aiming to maximize their QSO count and multiplier accumulation. The contest emphasizes accurate exchange of signal reports and serial numbers, with specific rules governing single operator, multi-operator, and SWL categories. Participants utilize software like _N1MM Logger+_ or _WriteLog_ to manage their logs and generate Cabrillo files for submission. Scoring is based on points per QSO, multiplied by unique DXCC entities and Italian provinces worked on each band. The contest encourages both seasoned RTTY contesters and those new to digital modes to engage in competitive HF activity, promoting skill development in digital communication. Final results and logs are typically published on the contest website, showcasing top performers and providing detailed breakdowns of scores.

X1M QRP SSB CW HF transceiver by K7JOE

Homebrewing a Lightweight linked dipole HF antenna for portable SOTA operations

Introduction to Software Defined Radio by AC8GY

In his page the author includes 27 mp3 audio files that compose the whole CW training course, instructions and whole lessons transcript are available in Italian and English.

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