emrath(at)comcast.net
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 Posted: Fri Nov 02, 2007 5:21 am Post subject: Re 496 Audio |
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Dave, thanks for your interest in this, I hope there is a solution. Like you, the thought of the warnings being muted by virtue of using the music jack to audio input on the GMA340 is not to my liking either.
Marty
Time: 11:03:06 PM PST US
From: "Dave Saylor" <Dave(at)AirCraftersLLC.com>
Subject: 496 Audio
Marty and all,
We learned a bunch today about audio out from the Garmin 496 that could be
helpftul.
I had a harness built by Stark to allow me to put audio from the power/data
chord from a 2/3/496 into unswitched audio in my GMA340 audio panel. Seemed
like a simple thing, but we never got any audio from the power/data chord.
Audio jack, yes, data chord, no.
Turns out the audio from the power/data cable is to drive an 8 ohm speaker.
I learned that by taking apart a Garmin 12V adapter/speaker and reading the
back of the $.05 speaker inside: Made in China, 8 Ohms, 2/3W.
The audio panel was looking for a 60 0 ohm input.
Interestingly, Garmin told told both John and me that the only audio coming
out of the 496, in aviation mode, was from the audio jack(3/496s have a 1/8"
audio jack, which outputs XM audio, and all the warnings, as well as "Voice
+" and "Voice -" wires in the power/data cable). Garmin said not even to
bother trying to get audio from the Voice wires while in aviation mode. It
did not exist.
Well, it does exist because it plays just fine with the speaker/12V adapter
plugged in. I put the unit in sim mode and flew into a mountain. The
speaker gives every warning you would expect, and the "Sound" page of the
Setup menu controls the audio as you would expect.
With a jack inserted into the audio plug, the XM audio is turned off to the
power/data chord but all the warnings still come through. Which is nice,
because if you wire the unit per Garmin's advice, and run the audio jack
into the music input of the audio panel, your terrain warnings will get
muted by intercom activity or incoming transmissions. I want to know about
those pesky mountains, even if it interupts music playing in the
background...
Now my problem is to figure out how to convert the 8 ohm signal from the
power/data chord to 600 ohms. I guess I need a transformer. I found a 8
ohm to 1000 ohm, with center tap, at radio shack...can anyone tell me if
that will work? How do I wire it?
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
831-750-0284 CL
www.AirCraftersLLC.com
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