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ARINC 410 Subsystem – Audio Routing March 4, 2012

Posted by phoenixcomm in Arduino, ARINC 410, Audio, DIY Aircraft Cockpit, Ethernet, G-4390, Gables Engineering, Linux, Radio Sub System, Semiconductors, Software.
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These are just some thoughts its not all here yet.

The Analysis: Well we need multiple audio sources, from things like VATSIM, NAV Morse code, co-pilot, weapons officer, and if you are flying formation a plane to plane chatter. For VATSIM, and for the inter-plane chatter we will need internet.

So, we need a computer that will have multiple audio cards, well that is going to eliminate a windows box. So I guess I need a Linux box, and we need a distribution that supports ALSA, the Advanced Linux Sound Architecture. So far so good. This box will also handle the radio ARINC-410 interface(s), the Morse Code generator, do the slant range (figures out if you are in range of the station), and drive my DME display. 

So here are all the components:

  • Radio Heads
  • ARINC-410 Interface Card
  • Audio subsystem
  • arduino
  • Linux pc with ALSA

. Since each ARINC-410 Interfaces have 3 bits for addressing the heads you can have 8 heads per interface. I could add a board select to each board so two boards gives you 16 radios..

Now you will notice that the lower arrow allows you to chain crew stations, so that means you need one audio adapter per crew station. Each of the Isolation Amplifiers use the radio heads volume control.  With all of this we still have not taken care of the mic.

Notes:

  • the audio wiring between the head and the interface has to shielded.
  • I have just use 3 audio sources for an example.
  • Remember that you have to dedicate one channel for an intercom (if you have multiple crew stations).
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