Receiving and Transmitting Morse Code (CW) With Your Macintosh
IntroductionUsing MultiMode, you can send and receive morse code with your Macintosh. After connecting your Mac to your radio (see our interfacing notes for details on this), fire up your copy of MultiMode and set it for CW (Morse Code) mode.
Next, tune in a station sending CW. When properly tuned in, the tuning display, which shows a
spectrum of the received signal, should look something like this:
The demodulation display looks like this:
Next, you want to select the correct speed for the morse code being sent, in WPM (Word Per Minute). You don't need to be very accurate here, being off a few WPM will still produce good decodes. You can also click on the AUTO button to have MultiMode automatically determine and set the speed. This usually works quite well, although it can be fooled by noise.
Decoded morse code characters will now start to appear on your screen. MultiMode can copy machine-sent CW very well. Hand sent morse can be copied if the operator maintains a proper dot/dash ratio, and spacing and speed. Very poorly sent morse code is difficult enough for a human to copy, let alone a computer!
For transmitting morse code, your Mac produces audio, at the same frequency specified as the center frequency. If you feed this audio into your transceiver, and transmit in SSB mode, you will end up transmitting on a single RF frequency, essentially duplicating a CW transmission.
email@example.com Chris Smolinski