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MultiMode allows you to decode and transmit morse code (CW), RTTY, FAX, SSTV, SITOR-B, NAVTEX, PACKET, ACARS, PSK31, ALE, and many other modes on your Macintosh, without any extra hardware. Just connect your Mac to your radio, and you're all set to go!

Download a copy of MultiMode OSX right now, to try out without obligation!

The cost of buying MultiMode OSX is only $89! Buy your copy online, and get your registration code in minutes!

We're so sure that you've find MultiMode useful that we're offering you a risk-free deal. You can go ahead and download a copy of MultiMode for absolutely free. Give it a try, and see how easy it is to use. Once you've decided that you find it useful, go ahead and register your copy. If for some reason you decide MultiMode isn't for you, just throw away your copy. That's it!

What Is MultiMode?

In the past, dedicated hardware, often costing hundreds or thousands of dollars, was necessary to demodulate and decode these transmissions. Today, you can use the processing power of your Macintosh to decode and display these modes, without any hardware.

MultiMode features sophisticated digital filters, for pulling weak signals out of the noise.

What Do I Need To Run MultiMode?

You also need a radio capable of tuning in the frequency ranges of interest. If you want to transmit, you'll need a transceiver of course. For most modes, this is a shortwave radio. For ACARS mode, a common VHF band scanner is used.

The audio from your radio (speaker or headphone jack) is fed into your Mac's sound input port, through an appropriate cable. The radio is tuned to the station, and the correct mode is selected. MultiMode has a feature which displays the audio spectrum of the station, as a tuning aid.

For transmitting, you simply connect the audio output of your Mac to the microphone input of your transmitter, possibly through an isolation transformer. There are many devices on the market that can do this for you, or you can do it yourself.

Be sure to take a look at our notes on Interfacing Your Macintosh To Your Transceiver To Run MultiMode

MultiMode Lite is also available, which is receive only, and only decodes Morse Code, RTTY, and Fax modes.

MultiModeOSX Version 5.9.2

As of now, the following modes are implemented, some receive only

• CW *
• RTTY (BAUDOT AND ASCII) *
• SSTV *
• FAX
• SITOR-A / SITOR-B / NAVTEX
• ACARS
• Packet * (not as a full TNC)
• PSK31 *
• ALE
• DTMF *
• VHF Tone Modes: EIA EEA, ZVEI1, ZVEI2, ZVEI3, PZVEI, DZVEI, PDZVEI, NATEL, EURO, MODAT, CCITT, VDEW, CCIR, CCIR7, PCCIR *
• ICAO SELCAL *
• CTCSS *
• LORAN-C
• FFT/Spectrum
• MT63 *
• Hellschreiber *
• Globe Wireless Channel Marker Packets
• CHU FSK Time information packets
• EAS Emergency Alert System *
• DGPS

Those with an asterisk (*) next to them support transmitting.

Please email your comments and reports to: info@blackcatsystems.com

A waterfall display has been added to PSK-31 mode. Now, you can see a 1600 Hz wide section of the band all at once. Just click on the transmission of interest, and MultiMode will automatically set the center frequency, making tuning PSK-31 transmissions easier than ever!

Download a copy of MultiMode OSX (Version 5.9.2, about 1MB)

MultiMode OSX (Version 5.9.2, about 1MB Zip Archive)

Download a copy of MultiMode OSX Lite (Version 5.9.2, about 1MB) - Only includes RTTY, CW, and FAX modes.

The cost of registering MultiMode is only $89!
(A lite version is also available, for $39, which decodes only CW, RTTY, and weather FAX)
Buy your copy online, and get your registration code in minutes!

Notes:
MultiMode creates a log file that shows the startup process of MultiMode OSX. If it crashes on your system, please send me the log file, to help debug why it's crashing!

Need help? Try our Useful MultiMode Links!

Here's MultiMode OSX displaying received RTTY from Canadian Forces Meteo:

Here's MultiMode OSX displaying a received SSTV picture:

Looking for a way to connect your computer to your Icom rig? Take a look at the Black Cat Systems USB Icom CI-V Interface