Amateur radio, RF design, electronics, uC, software, hacks, technology
I recently needed a new CW keyer with Winkey compatibility for use with my N1MM logging setup. This was equipment I needed in time for the Azores Island Hunt http://azores-islands-hunt.com/. K3NG has written some nice keyer code that I compiled and uploaded to one of my Arduino UNO boards that I had laying in the shack (if you want to try it, you need the latest – above 1 – version of the Arduino “IDE”). Below you can see some pictures from making the prototype thru to ready made keyer with USB interface and adjustable speed button. I did not install the memory buttons, as I control the CW keyer via USB from N1MM or Hamradio Deluxe. It works very well with my Yaesu FT-450D but instead of the UNO I will use a Mini Pro board with the Atmel Atmega 328. You can see more info on K3NGs site http://radioartisan.wordpress.com/arduino-cw-keyer/#comment-3255
Below is the schematic (credit K3NG). I have modded the design for my needs. Instead of the 2N2222 I use a TTL tolerant FET of type IRLIZ44N to drive the keyer output. Then I don’t need the 100 ohm resistors. I also did connect a piezo tweeter directly without using the 2N222 transistor. It works ok. However the sound of the piezo tweeter is not the best in the world. Finally, as mentioned above, I did not install all the buttons. I installed only the command button to save space. There is a need to do a small mod on the UNO hardware due to some reset issues. For that I will have to add another button that needs to be pressed when I want to upload code.
I also needed a CAT interface for the same DX-pedition. You can use a FTDI chip for this task however the signal levels need to be transformed to +/- 12V. This I did with a MAX232 board that I had sitting in the shack. So now I have a CAT interface that is compatible with Win XP, NT, 2000, 98, Windows 7 etc since the FTDI chips are widely supported.
Posted: September 25th, 2012 under Amateur radio, DX.
Tags: Arduino, AVR, CAT, CAT compatible, computer interface, CW, CW keyer, development, FTDI, Ham radio Deluxe, K3NG, LB3HC, microcontroller, mini, morse, morse code, N1MM, portable operation, prototype, USB, winkey, Yaesu