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496 Audio--easy fix

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Dave(at)AirCraftersLLC.co
Guest

Posted: Tue Nov 06, 2007 4:03 pm Post subject: 496 Audio--easy fix

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.

  

 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][b]

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N81JG(at)aol.com
Guest

Posted: Tue Nov 06, 2007 5:52 pm Post subject: 496 Audio--easy fix

HI Dave,

  

 I just got my RV7A panel all together and the XM antenna working. When I  turned on the XM, radio and intercom ( I don't have an audio panel since I have  only an SL30) I had the XM come on at high volume. I then noted that there was  no volume control for the XM other than the intercom or headset controls. The  GPS warning came through clear. I guess I will have to place a potentiometer in  the GPS 1/8" output line to control the XM volume. Does anyone know how and  where I get the right pot to do the volume control? I decided when I wired the  Flightcom intercom and set the dip switches I didn't want the music to mute each  time the radio or intercom squelch was broken so I will have to keep the music  volume toned down so I will not miss any reception or warning. Oh, I guess the  warnings will be toned down with the music. I'll have to see how that works.  Mainly I want to be able to control XM music volume independent of the  radio.

  

 John Greaves    

 RV7A nearing completion

 VariEze N81JG nearing replacement of overhauled engine

 Redding, CA



See what' [quote][b]

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Dave(at)AirCraftersLLC.co
Guest

Posted: Wed Nov 07, 2007 10:07 am Post subject: 496 Audio--easy fix

You can run  the XM volume up and down by tapping the power button and scrolling  left/right.  QUIT to exit.  Not quite as easy as a knob but at least  it's all there already.

   From:  owner-aeroelectric-list-server(at)matronics.com  [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of  N81JG(at)aol.com

Sent: Tuesday, November 06, 2007 5:52  PM

To: aeroelectric-list(at)matronics.com

Subject: Re:  496 Audio--easy fix

 HI Dave,

 I just got my RV7A panel all together and the XM antenna working. When I  turned on the XM, radio and intercom ( I don't have an audio panel since I have  only an SL30) I had the XM come on at high volume. I then noted that there was  no volume control for the XM other than the intercom or headset controls. The  GPS warning came through clear. I guess I will have to place a potentiometer in  the GPS 1/8" output line to control the XM volume. Does anyone know how and  where I get the right pot to do the volume control? I decided when I wired the  Flightcom intercom and set the dip switches I didn't want the music to mute each  time the radio or intercom squelch was broken so I will have to keep the music  volume toned down so I will not miss any reception or warning. Oh, I guess the  warnings will be toned down with the music. I'll have to see how that works.  Mainly I want to be able to control XM music volume independent of the  radio.

 John Greaves    

 RV7A nearing completion

 VariEze N81JG nearing replacement of overhauled engine

 Redding, CA

   See what'  	  Quote: 	

href="http://www.matronics.com/contribution">http://www.matronics.com/chref="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

href="http://forums.matronics.com">http://forums.matronics.com

    [quote][b]

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FisherPaulA(at)johndeere.
Guest

Posted: Wed Nov 07, 2007 2:45 pm Post subject: 496 Audio--easy fix

Dave,

 Thank you for posting your solution.  I had kept your  original note because I intend to do the same thing you described.  My  intention was when I got closer I would contact you to see where you ended  up.  Now I'll just keep this one!

  

 I'm glad to hear you got everything working.  Your  solution was certainly not intuitively obvious (meaning I would have never  figured it out!).

  

 Thanks for being the pioneer!

  

 Paul A. Fisher

 RV-7A (still finishing!)

  



   From:  owner-aeroelectric-list-server(at)matronics.com  [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Dave  Saylor

Sent: Tuesday, November 06, 2007 18:02

To:  aeroelectric-list(at)matronics.com

Subject: 496  Audio--easy fix

 

 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.

  

 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]



.matronics.com/contribution

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

ics.com



[b]

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

Posted: Wed Nov 07, 2007 3:26 pm Post subject: 496 Audio--easy fix

For  anyone who knows:  I wired my GPSMap 296 this way about 2 years ago using  my Sigtronics SPA-400 intercom and the Vx-Aviation AMX-1A Audio Bus, hoping that  Garmin would introduce voice warnings on the 296.  The audio works  fine:  I get a voice alarm when power fails and a voice prompt when I  change volume.  I don't get any other voice warnings,  however.

  

 I  imagine the 496 and 296 share a lot of common code, so I would expect the 296 to  have voice warnings as well.

  

 Has  anyone been successful in getting voice warnings from the 296, or am I doomed to  upgrade to a 496 to get this feature?

  

 Thanks, Vern Little

 [quote]   

   --

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emrath(at)comcast.net
Guest

Posted: Wed Nov 07, 2007 7:47 pm Post subject: 496 Audio--easy fix

John,

I believe, if you are using a Garmin portable held for the XM feed, there

are some settings on the "Sound" page to control the volume.



Time: 05:52:53 PM PST US

From: N81JG(at)aol.com

Subject: Re: 496 Audio--easy fix



HI Dave,



I just got my RV7A panel all together and the XM antenna working. When I  

turned on the XM, radio and intercom ( I don't have an audio panel since I

have



only an SL30) I had the XM come on at high volume. I then noted that there

was



 no volume control for the XM other than the intercom or headset controls. 

The  GPS warning came through clear. I guess I will have to place a 

potentiometer in  the GPS 1/8" output line to control the XM volume. Does

anyone know how 

and  where I get the right pot to do the volume control? I decided when I 

wired the  Flightcom intercom and set the dip switches I didn't want the

music to 

mute each  time the radio or intercom squelch was broken so I will have to 

keep the music  volume toned down so I will not miss any reception or

warning.



Oh, I guess the  warnings will be toned down with the music. I'll have to

see 

how that works.  Mainly I want to be able to control XM music volume

independent



of the  radio.



John Greaves    

RV7A nearing completion

VariEze N81JG nearing replacement of overhauled engine

Redding, CA

Marty  ҿӬ

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emrath(at)comcast.net
Guest

Posted: Wed Nov 07, 2007 7:47 pm Post subject: 496 Audio--easy fix

Dave,  

First, thank you for your diligence in this matter and for sharing your

knowledge openly on this list. 



If I understand your comments below the "Voice -" line from the 496 is left

open, right?  



I think the only reason for the 220 ohm resistor may be due to having the

EFIS voice on the same input connection.  I think Bob has commented on this

before on this list or it may be in his book, I seem to recall something

about this in his audio amplifier section dealing with audio isolation.

Bob, can you "weigh-in" on this issue?



Marty

Time: 04:03:32 PM PST US

From: "Dave Saylor" <Dave(at)AirCraftersLLC.com>

Subject: 496 Audio--easy fix



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

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MauleDriver(at)nc.rr.com
Guest

Posted: Thu Nov 08, 2007 4:35 am Post subject: 496 Audio--easy fix

On my 396, you hit the power on/off button momentarily which brings up a 

pop-up with both volume and screen brightness controls.  Hitting any 

other button afterwards kills the pop-up.



Emrath wrote:

 	  Quote: 	
		   

 John,

 I believe, if you are using a Garmin portable held for the XM feed, there

 are some settings on the "Sound" page to control the volume.

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