Installation and configuration of the radio command interface via the audio card

Connection

The different elements are :

-         A stereo mini-jack on the PC

-         A suitable plug on the RC

-         A twisted cable or shielded cable witch links the PC and the RC and allows to send the PPM signal on the line entry of the audio card

 

The attenuator is needed only if the volume adjustments are insufficient. See below.

On the PC, it’s better to use the line input. If it doesn’t exist (on some portables), the micro input can be used but then the attenuator is essential.

The connectors stitching of the radio command can be found in
http://uscaero77.free.fr/fms/images/cablefms.gif
Or for Futaba in
http://www.model-gadgets.com/info/infopage/infopage.htm
 

Audio card configuration

Opening volume adjustments panel (for example by a right click on "Volume" on the right of the task bar)

This panel allows to adjust volume of what is heard by the loudspeaker. It’s not used by our interface. It is more comfortable to invalidate the line input, except for the tests during which the signal must be heard.

The “Option” menu enable to open the “Proprieties” panel.

Check « recording », and then click « OK » in order to open the recording volume adjustments panel:

Select « Line input » (or « Microphone input »). Unselect the other inputs.

Adapt the input level in order to not saturate.

The panel of volume adjustments gets a level indicator. Adapt it so as not to go to red zone.

It’s also possible to use the “recorder”. Click on the red button to see a simplified oscilloscope.


Volume too hight


VolumeOK


Volume too low

 If a simple cable without attenuator is used, it’s probably necessary to fix the “Line input” volume at minimum (but not at 0!).

It can be impossible to find an adequate position for volume level if the signal sent by the radio is too high: in this case an attenuator must be inserted on the cable. This attenuator is constituted of two resistors (see schema below).

 

Installation

- Installing CRRCSIM normally.

- Unzip the crrsim-au.zip file and copy crrcsim-au.exe in the crrcsim repertory (with *.air, glut.dll, crrsim.cfg... files.)

- Modify the crrsim.cfg file to select the interface input_method :  AUDIO

- Launch crrcsim-au.exe with the “.air” file wished.

Note1: if you use "Launcher", select parallel1 interface (by waiting for Nigel Coward add "AUDIO" interface, PARALLEL1 is identical at AUDIO in crrcsim-au version)

Note 2: if you have a 2 axes radio command, “up” and “down” keys command the gaze control as with JOSTICK 2) 

Note 3: The audio interface is integrated in version CRRCSIM-F3F of Olivier Bordes.

 

Joël Liénard (joel.lienard@laposte.net)