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About keying speed affecting occupied bandwidth of a transmitter.

Encode/decode On-Off audio pulses for remote control of projects

Amateur Radio - US Navy - New York City Home of the Virtual Collins Radio Museum

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

A voice keyer with up to 60 seconds memory in total, A CW keyer using the famous N0XAS design, aka Picokeyer and a 4 channel sequencer

A compact voice keyer for Icom IC-7000

Designs, engineers and markets a unique line of mobile and fixed station RF communications antennas with a key focus on maximizing antenna value.

Easiest possible tuning steps using a closed CW key, FM or AM tuning the Ameritron AL-811H

Amateur radio accessories, like the CT-17B ICOM CI-V hubs, IABs ICOM ACC1 Breakout boxes, GS232Dunio GS232A/B arduino based rotor controler, IMK memory keypad for ICOM Radios

Programming the FT-8800R via the front panel and microphone keypad is not extremely difficult. Already having a list of local repeaters in CHIRP, the addition of a USB cable would allow you to coordinate the memory layout across multiple radios with ease.

Virtual Signal/One Radio Museum

Replica of David Sarnoff\'s Key, Marconi operator at Station WHI

The AA4F Key Contact Cleaner is designed for maintaining key contacts, ensuring reliable operation in 2-way radio communications. **Regular use** of this cleaner can significantly improve contact performance, reducing the risk of intermittent signals. It is particularly effective for cleaning contacts on various key types, including _straight keys_ and _paddles_. Proper maintenance extends the lifespan of your equipment, ensuring consistent operation during contests and DXing activities. Users report improved key responsiveness and reduced key chatter, which is crucial during high-pressure operating conditions. Regular cleaning can prevent oxidation and buildup, which can lead to erratic key performance. This product is essential for serious operators who rely on their equipment for successful communication.

A Combination CW Keyboard and Paddle Keyer. It uses a single Atmel microprocessor, the ATmega328P from the AVR family, and a 4 row by 20 column LCD display module.

Baofeng UV-B5 LCD background light is turned on only when some keys are pressed and stays on far a very short time. This article explains how to use flash switch which is used in UV-B6 version but in UV-B5 has no function.

Description of an HF beacon keyer with telemetry. What makes the keyer rather different is its versatility - it is a multi-mode unit, with ASK and FSK modulation, sending Feld-Hell and Morse on command

Clicks are most problematic when we try to copy weak signals next to moderately strong signals. How to recognize them, and how to identify clicks problems

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

Milton Keynes, Buckinghamshire England

Homebrew Antennas, Transmitters, Receivers, Converters, Keyers and SWR/RF Current Indicators with photographs an excellent blog with many projects by VU2NAN

General station info and Paddle Museum (online display of keys and paddles)

TCSWAT Lighthouse Awards from Turkey

This article documents the author's latest go-box build for outdoor ham radio operations using a Yaesu FT-891 transceiver. The go-box is constructed from a plastic "50-cal ammo case" and contains various components, including the transceiver, LDG Z11 Pro autotuner, DIY Yaesu FH-2 remote control keypad, and an external battery. The author details the design considerations, the mounting of components inside the box, and addresses issues related to ventilation and cable management. The go-box is geared for CW operations and POTA activations, with further modifications planned for a microphone and DATA jack. This project allows for rugged, environmentally protected outdoor radio operations while maintaining portability.

The BikeLoop antenna project details the construction of a double magnetic loop antenna optimized for VLF frequencies, specifically around 136 kHz. This innovative design incorporates two orthogonal loops, which significantly enhance reception capabilities. Key construction hints include utilizing lightweight bicycle rims for the antenna structure, making it easy to transport and set up in various locations. The document provides valuable mathematical and electrical insights into the antenna's performance, alongside practical reception tests conducted in the Italian Alps, showcasing its effectiveness in capturing various VLF signals, including Sferics and FSK transmissions. Proper setup is crucial for optimal performance. The project emphasizes the importance of grounding and avoiding interference from nearby electrical sources. The reception tests revealed the antenna's ability to capture a range of signals, demonstrating its practical application for enthusiasts interested in VLF reception and antenna experimentation. Overall, the BikeLoop serves as an excellent starting point for those looking to explore the world of VLF frequencies and enhance their antenna-building skills.

A personal blog about amateur radio activities, including homebrew, bitx, ubitx, mcHF, JT65, FT8 and more digital communications.

The club was founded in 1987 when a group of ham operators hauled radio gear, antennas, and a generator to the island by boat to operate portable during ARRL Field Day

Successor to the Metamorserino, this is a multi-functional Morse code machine (Keyer, Generator, Trainer) that includes also a transceiver using LoRa on the 70cm band.

The antenna ground or earth system can be key to its operation whilst also being a key safety feature. This article is about grounding systems for antennas, covering different aspects of grounds made for antenna safety, or expressly for lightning or just to improve antenna performance, being ground an antenna component.

Free Windows program intended to be used as a training aid for sending CW using an iambic Winkeyer from K1EL Systems. Iambic Master operates as a game. The objective of the game is to send the text in the Target box as accurately as possible.

Schematic diagram circuit to build a RS232 serial interface for the Yaesu FT 1000D, works also as CW Keyer control with Log-EQF software. May be used with other Yaesu HF Transceivers.

The K3NG Keyer is an open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, rivaling commercial keyers which often cost significantly more.

The Terminated End Fed Vee Antenna (TEFV) is a travelling wave antenna with constant current distribution. Unlike traditional resonant antennas, TEFV operates without standing waves, using a terminating resistor for broadband efficiency. With a combination of vertical and horizontal polarization, it offers wide bandwidth from 1.8 MHz to 30 MHz, eliminating the need for a tuner. Key components include a 9:1 unun transformer and a 500-ohm terminating resistor. Grounding and counterpoise enhance performance, and it can handle power losses of up to 30%. TEFV provides an effective, versatile antenna solution for amateur radio and broadcast applications.

Useful Function for the Drake TR-7(A) \"Store\" Switch Add A Transmit Key Function

A collection of several morse keys and paddles

DOMINO DF is a sensitive mode which, due to its incremental frequency keying and thanks to its interleaved multiple tones sets, is easy to tune and is few sensitive to interference and ionospheric effects. Domino faeture a great signal to noise ratio.

A voice keyer kit available on the marker in two models, BX-184 is the replacement PCB for those who already own an MH-31 microphone. Kit BX-184M includes an MH-31 besides the PCB for those not owning one yet.

Win-Test Contest Logger scripts for VGS-1 Voice keyer module for the TS-590 by DK5TX

How to build a Simplified Arduino CW Trainer, this is a version that does not need a keyboard.

This morse key and buzzer design only requires parts that one may already have or are easy to find on the web. There is nothing critical except that the contacts must meet when the key is depressed.

The Necessary Bandwidth for CW Signals By George Grammer W1DF

Discover the key facts about what radio propagation is, the different types available and how they affect different frequencies.

The PARC web site describes ham radio activities and information of the Peterborough Amateur Radio Club in Peterborough, Ontario

CW_Shark is a 32-bit Windows program designed for analyzing, decoding, and encoding Morse code. The program offers four modes: Decode Only, Keyboard QSO, Straight or Paddle Key QSO, and Straight or Paddle Key Practice.

An overview of the development of the Morse key for sending the Morse Code, from the first camelback keys, through straight keys and sideswiper keys to the semi automatic keyers including the Vibroplex to the modern electronic keyer.

ESP32 portable CW Keyer with touch buttons and bluetooth interface, allows control from mobile phone and other devices, Up to 25 pre-saved messages, Variable speed from 5 to 70 wpm.

A simple 3D Paddel CW Key made of plastic with a standard 3d printer

Iambino is a Iambic Keyer for Arduino running hardware containing an ATmega328 or ATmega32u

Book on CW paddles, history of keyers, keyboards, oscillators, and all things related to automatic Morse code.

Simple soundcard interface that can satisfy several requirements like totally isolated AF interface, Totally isolated PTT and CW Key interface, Extend Accessory connector to interface to allow easy connection of TNC and provide a solid PTT or SEND connection

This article introduces an Arduino-based QRP CW Transceiver designed for lower HF bands. The journey begins with the Wotduino, evolving from a keyer to a multi-mode beacon. The development includes a QRP transmitter and culminates in a receiver inspired by Roy Lewallen design. The transceiver, controlled through a control bus features a signal path, modulation, filtering, and adjustable frequency settings. Despite initial testing intentions, successful QSOs on 80 and 40 meters showcase its functional capabilities.