![]() ![]() This would allow people to do exactly what I am describing here This project has also convinced me that the ham community is in need of adoptingĪ standard modem interface for use with our more popular HF digital mode From here in, I will refer to the "modem",īut it is easily used as a terminal device by connecting to it using a terminalĮmulator such as miniterm or the Serial Monitor included in theĪrduino development environment. Program for real-time keyboard-to-keyboard QSOs, or integrated into a moreĬomplex software package, as the command and configuration interface is readily adaptedįor use in existing programs. I call this project a "modem," but it can be used with a simple terminal Through its A/D converter, and then do some basic DSP detection and filtering ofĪnalog CW signals, without the need for an external tone detector. Microcontroller also has enough computing power to read audio data directly I was surprised to learn that the little AVR Perform the morse code decoding operations, while offloading the tone detection My original goal was just to get the Arduino to This project has gone through several revisions, and now supports This article describes hardware and firmware forĮncoding and decoding of on-air CW using an modem based on these controllerīoards. I recently started playing withĪruduino boards for various ham applications, and thought a CW program for theĪrduino might be fun. Version 2.0 modem, based on the Teensy, see the Version 2.0Ĭode) is one of my favorite activities. In the next post – I show the LM567, the schematic and give you the list of parts required.CW Modem Matt Roberts - matt-at-kk5jy-dot-net Published: Updated: This article is for the original version, based on the Arduino Uno. This project covers all 3 areas, and only lightly covers each subject area. I wĪnt to create a project that would “inspire” young electronically minded students that might have an interest in radio – (i.e the morse code) some coding experience and some construction / electronic interest. I will go into more technical detail on the next post – but for the reason why I wanted to complete this ? very simple. This did indeed take quite a lot of chasing and head scratching. ![]() I used the limited shared knowledge and discovered that the electronics is basally a LM567 – Tone decoder chip that (I have since discovered the chip is used in the ARRL book for Arduino Projects) I discovered takes an audio input and converts this to a HIGH / LOW output suitable for the Arduino to use as a signal for decoding.įinding a suitable project for the LM567 and trying to work out how fellow constructors had configured their LM567s was not an easy task. I ventured further and wanted to know what electronics Budd was using to achieve this excellent little project. I stumbled across a video on YouTube where Budd Churchward showed his Arduino copying and decoding CW straight off the HF band and at a reasonably high speed. ![]() I have a number of reasons why I want to combine radio, Arduino and some electronics – more about this later. I recently started looking at some projects that I could get my Arduino Uno involved in with the radio hobby. So, for those who have not been following me on twitter – here is the sales pitch. After a number of retweets, and favorites from other very interested hams – I did promise that I would collate all my knowledge into a blog posts and share the details with you all. ![]() If you do follow me on twitter (and if you don’t – you really should) you will have no doubt seen my recent tweets about constructing a CW decoder. ![]()
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