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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