DAX Flowchart

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  • Updated 3 years ago
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Does anyone have flowchart that explains the inner workings of DAX. I'm trying to explain it at our radio club meeting.
Photo of Bob G   W1GLV


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Posted 3 years ago

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Photo of Steve - N5AC

Steve - N5AC, VP Engineering / CTO

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Official Response
Here's the basic picture when you are using a Windows PC and using virtual sound cards:

And here's what happens:
1. SmartSDR for Windows communicates to the radio what DAX channels you want for any/each receiver through API commands and does all other radio control functions (create receivers, tune them, etc.)
2. The DAX control panel (optional) turns on or off the DAX channels and makes adjustments to the audio levels for the streaming VITA-49 data that also travels along this path (2).
3. The DAX control panel exchanges samples with virtual sound card drivers installed with SmartSDR that make the DAX system look like sound cards in your PC
4. Your digital mode program connects to the sound card to transmit and receive data.

Note that this picture just shows audio samples and does not show control information for the radio (frequency, transmit, etc) which is done over CAT.  DAX can also completely eliminate the DAX Control Panel and the DAX Virtual Sound Card Kernel Driver if the Digital Mode Program (yellow box) can talk directly to DAX using UDP/TCP/IP.