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Lately I've been aspiring to become a licensed amateur radio operator (HAM). I'm taking it slow and begining to look into the rules, regulations, equipment, etc. I know that learning Morse Code is no longer a requirement for a technician class license, but it's something I'd like to learn anyway.
So, to help me in this endeavor I've created a set of mp3's suitable for listening in the car on the way to and from work, while working, or wherever. Overall I have the alphabet, numbers, and a sentence in morse code (the quick brown fox jumped over the lazy sleeping dog). Below you can download various versions (parts or whole).
The morse is recorded at 800Mhz 15WPM per letter with 5WPM of "space" (farnswoth method).
Some of the individual mp3's are wrapped in .tar files. These files are
"tape archives" that put multiple files in one file. WinZip will
be able to extract these files fine as will Stuff-It I believe. You Unix
folks probably know how to handle them. .gz files are gzip'd. Again,
WinZip and Stuff-it should handle this fine.
| File | Size | Description |
|---|---|---|
| letters.tar | 1.3M | Individual mp3's for each letter. Each repeated 10 times. |
| numbers.tar | 540K | Individual mp3's for each number. Each repeated 10 times. |
| letters_voice.tar | 9.0M | Individual mp3's for each letter. Each repeated 10 times. Voice states letter before each set. |
| numbers_voice.tar | 3.9M | Individual mp3's for each number. Each repeated 10 times. Voice states number before each set. |
| alphabet_onetrack_voice.mp3 | 13.0M | A-Z 0-9 all one file. 10 repetitions of each character. Voice states character before each set. |
| alphabet_onetrack.mp3 | 1.7M | A-Z 0-9 all one file. 10 repetitions of each character. |
| quickbrownfox.mp3 | 111K | THE QUICK BROWN FOX JUMPED OVER THE LAZY SLEEPING DOG |
For those intersted in the method I used.
Tools used:
- cwtext for creating the morse code sound files.
- sox to save the raw audio as a .wav.
- LAME to convert the sound files to mp3's (though it wasn't entirely necessary - Audacity could handle the raw files I think)
- Audacity for mixing the parts.
The code I used to generate the morse code tones was something like this:
echo "a a a a a a a a a a" | cwpcm -ss -f:800 | sox -r 8000 -bu -t raw - tmp.wav
I then converted the raw files to mp3's:
lame -s 8000 tmp.wav tmp.mp3
These I loaded into Audacity which I used to record my voice and mix it in with the morse code tones.
Thoughts? Comments? Suggestions? e-mail me!
