Matronics Email Lists :: View topic - Garmin 296 Audio Output

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Garmin 296 Audio Output

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Mon Jan 07, 2008 5:44 am Post subject: Garmin 296 Audio Output

I am installing a Garmin 296 GPS into my Zodiac 601XL build.  I am also installing a PS Engineering PM501 intercom.  I am pretty much up to snuff on the NMEA data output wires that will talk to my Dynon and Digitrack autopilot.  I also see an "alarm" wire and audio positive and negative wires and they have me a bit confused.  



The Garmin manual says the alarm wire is only for marine applications, but says no more about it's functionality.  The manual also says the audio wires are only for automotive speaker use and are not for an intercom system.  



I am guessing that when wearing headsets combined with the ambient engine noise, I will not be able to hear the Garmin's built-in beeper when course, terrain or airspace alerts pop up.  How have others connected these GPS alerts into their audio systems??



Thanks,

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
David Gallagher
Cincinnati, OH area

Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Mon Jan 07, 2008 6:33 am Post subject: Garmin 296 Audio Output

I have pasted the contents of another email I saved from Dave Saylor dated

11/06/07 I saved that might help.



Allen



--------------------------------------------------------------------

We have the audio working as desired from the 496.  It turned out to be a

very simple solution.



To recount:



It was my intention to have terrain warnings from a Garmin 496 wired to the

unswitched audio input of a Garmin GMA340 audio panel.



Garmin sells a "power/data cable" that provides wiring for audio output

along with serial data and 12VDC to power the GPS.  The audio wires are

labeled "voice+" and "voice-".  Garmin also sells a similar cable that

terminates in a speaker housed adjacent to a 12V plug for using in the car.

I took the speaker housing apart and confirmed that the voice+/- wires

connected to the speaker.



When we ran the voice wires into the audio panel, we got nothing.  We tried

several approaches, including running the audio into DME (nothing), ADF

(nothing), though an audio transformer, though a potentiometer and through

various simple resistors (zip, zero, nada).  Just dead air from the 496.



Finally, Jacek Kesy, who works at AirCrafters, discovered that when the

"voice-" wire from the GPS was disconnected from the audio panel, everything

worked perfectly.  Audio must be grounding somewhere else, and the wire that

certainly seems like audio ground is actually "audio disable".  Once the

voice- wire is grounded, you have to turn the 496 off and back on to get any

audio.



Here is how the final scenario is wired:



1/8" audio jack is wired to Music 1 on the audio panel.  It outputs warnings

and XM audio.  Music 1 is muted by intercom activity or incoming

transmissions.



As an aside, I also have a 1/8" audio jack wired through a toggle so I can

select either XM or some other source for Music 1.  But that has no bearing

on the 496 audio problem.



 	  Quote: 	
		  From the 496 power/data cable, the "voice+" wire ties to a 220 ohm resistor,

then to the unswitched audio input at the audio panel.  The only other
	


unswitched audio input is from the EFIS.  It also goes through a 220 ohm

resistor.  Perhaps someone else can tell us what exactly the 220 ohm

resistors do--my understanding is that they balance the two audio signals.

I don't know what would happen without them.



So now, even though the warnings coming from Music 1 are at time muted, I

always get the EFIS warnings and the terrain warnings, as long as the audio

panel is on.



There are a bunch of setup parameters for the 496 as well on the Sound page

of the main menu.  Those are all pretty intuitive and seem to mostly effect

the audio jack, not the output to the power/data cable.



So that's it.  Problem solved basically by trial and error, but it's working

the way I want it to now.



Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com

--------------------------------------------------------------------

[quote]>>--

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
RV7 QB Fuselage
Eggenfellner H6 on orde
N808AF reserved
Alexander City, AL

Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Mon Jan 07, 2008 8:56 am Post subject: Garmin 296 Audio Output

David Gallagher,

I didn't think the 296 provides audio when in Aviation mode. At least mine 

did not...to my knowledge. I am using the same power/data cord for my 396 so 

perhaps the audio wires are for other xx6's.

Dale Ensing



-list(at)matronics.com>.

Sent: Monday, January 07, 2008 8:44 AM

Subject: Garmin 296 Audio Output

 	  Quote: 	
		   

 <david.m.gallagher(at)ge.com>



 I am installing a Garmin 296 GPS into my Zodiac 601XL build.  I am also 

 installing a PS Engineering PM501 intercom.  I am pretty much up to snuff 

 on the NMEA data output wires that will talk to my Dynon and Digitrack 

 autopilot.  I also see an "alarm" wire and audio positive and negative 

 wires and they have me a bit confused.



 The Garmin manual says the alarm wire is only for marine applications, but 

 says no more about it's functionality.  The manual also says the audio 

 wires are only for automotive speaker use and are not for an intercom 

 system.



 I am guessing that when wearing headsets combined with the ambient engine 

 noise, I will not be able to hear the Garmin's built-in beeper when 

 course, terrain or airspace alerts pop up.  How have others connected 

 these GPS alerts into their audio systems??



 Thanks,



 --------

 David Gallagher

 601 XL, tail and wings completed,

 fueslage almost done. Working engine and electrical systems.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=156516#156516

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

rv-9a-online(at)telus.net
Guest

Posted: Mon Jan 07, 2008 10:25 am Post subject: Garmin 296 Audio Output

I've played around with this in aviation mode.  I connected one of the audio

output signals into my audio system, and obtained voice alerts.

Unfortunately, the only alerts are for power fail and when you set the

volume.  Nothing else.  I'm hoping Garmin will add aviation voice alerts in

future... But Garmin is not big on feature enhancements.  It may have

something to do with liability.



As for the alarm output, I've played around but cannot get it operating in

aviation mode.



BTW, I tied the audio output Voice+ into the headset bus of a Sigtronics

SPA-400 intercom using a Vx Aviation AMX-1A audio mixer(www.vx-aviation.com)

Alternatively, you could do the same with a 510 ohm resistor.



Vern Little



--

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum