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Audio out for Aera 560 GPS?

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dhi(at)us.ibm.com
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Posted: Fri Dec 30, 2011 10:58 am Post subject: Audio out for Aera 560 GPS?

I'm looking for a sanity check on wiring a Garmin Aera 560 into my panel.  My main objective is to get the GPS alerts to my headset.   

 

The Garmin documentation for the aviation bare wire mount was not helpful and essentially just says the audio out  is: White (Audio Right), Brown (Audio Left) and Green (Audio Common) .   Reference [url=sans-serif]http://www8.garmin.com/manuals/aera500_PilotsGuide.pdf[/url]   page 140 of the manual. 

 

 Writing and calling Garmin did not prove fruitful as they say the audio out is for a "Marine Sounder" and that I should use the Audio Out stereo out on the side and not these three wires for proper XM music quality.   I could find no other documentation.  I also have a Sigtronics SPA-4S so in my quest for information I called them.   The person at Sigtronics was very helpful and the summary of his advice was this: 

 

Connect a 220 ohm 0.25 W resistor to the audio right, another to audio left and then connect the other ends of the resistor together and splice into the J1 connector, Blue wire from radio headphone audio. 

This should give the proper priority to the GPS audio warnings (Terrain,  Airspace, etc.).  Adjust the resistor down if needed to increase GPS volume but this will also decrease volume from the radio.  

Reference diagram at  http://www.sigtronics.com/pdf/air_pdf/SPA-4S_King_KY-97A_Inst.pdf   

 

So, my questions are; 

Does this strategy and resistor value sound right to convert this to a mono output? 

I'm assuming I still connect the Audio common, green wire of the GPS to ground, correct? 

If I want XM radio, then I would plug into the audio out stereo port on the side of the GPS to the Music Input jack that is wired into intercom.  Correct? 

 

Any additional guidance or advice would be greatly appreciated!   

 

Don Ingalls  [quote][b]

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dougshep

Joined: 22 Jul 2010
Posts: 7
Location: Santa Barbara, CA

Posted: Sun Jan 01, 2012 8:10 pm Post subject: Audio out for Aera 560 GPS?

I also am interfacing a panel mount 560 with my avionics (PMS6000B audio panel).  I use their bare wires cable 010-11385-03.



Your questions:

      Does this strategy and resistor value sound right to convert this to a mono output?

Yes. I contacted Garmin (phone 1-866 739-5687).  They told me  "The Audio Left and Right outputs on the bare wires cable 010-11385-03, outputs both Aviation Alerts and XM Radio.  To connect to a mono audio panel, they suggest using either two 100 or 120 ohm resistors, each in series with the audio outputs, then connecting them together to an audio panel input. "  I tried this on the bench and it worked OK.



      I'm assuming I still connect the Audio common, green wire of the GPS to ground, correct?

Yes.  This is their common, or return, lead.



      If I want XM radio, then I would plug into the audio out stereo port on the side of the GPS to the Music Input jack that is wired into intercom.  Correct?

The 010-11385-03 cable has all the necessary connections, except antennas, to interface to other avionics equipment.

This includes the AERAs RS-232 output, and its power input.  Also note, the Left and Right audio outputs have an 8 ohm source impedance.



Doug Shepard, RV-9A, Avionics wiring

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_________________
Doug Shepard, RV-9A

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