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GNS430 Wire Book

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slipstream(at)wavecable.c
Guest

Posted: Wed Feb 24, 2010 9:42 pm Post subject: GNS430 Wire Book

I'm still trying to sort out my GNS430W's lack of comm.  I had the unit bench tested here locally, and it works just fine at the avionics shop, so the issue must be my wiring somewhere.  The wire book for AGATE that I've downloaded shows the 430 being hooked up through the GMA340.  All I want to use is a simple Sigtronics intercom; no audio panel.

  

 The Sigtronics does not have "audio low" or "mic low" inputs.  I believe I read somewhere that these are to be grounded, so that's what I did, but I can't find that reference right now.  The Garmin manual (4.7.2.3) states that they're balanced inputs, and that both must be connected.  I'm a bit wary of experimenting willy-nilly with this radio, so I haven't gone and tried tying them together yet.

  

 Also, the AGATE wire book shows a "Comm Mic Return" pin 8 on P4002, to be joined with the Comm Audio Lo.  The Garmin manual simply shows that as a reserved or unused pin.

  

 Brooks Wolfe

         [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Thu Feb 25, 2010 6:48 am Post subject: GNS430 Wire Book

At 11:41 PM 2/24/2010, you wrote:

 	  Quote: 	
		  I'm still trying to sort out my GNS430W's lack of comm.  I had the 

unit bench tested here locally, and it works just fine at the 

avionics shop, so the issue must be my wiring somewhere.  The wire 

book for AGATE that I've downloaded shows the 430 being hooked up 

through the GMA340.  All I want to use is a simple Sigtronics 

intercom; no audio panel.



The Sigtronics does not have "audio low" or "mic low" inputs.  I 

believe I read somewhere that these are to be grounded, so that's 

what I did, but I can't find that reference right now.


	


     Yes . . . when those pins are not available as

     dedicated inputs, use signal or power grounds

     as close to the intercom's cable connector

     as practical . . .



 	  Quote: 	
		     The Garmin manual (4.7.2.3) states that they're balanced inputs, 

 and that both must be connected.  I'm a bit wary of experimenting 

 willy-nilly with this radio, so I haven't gone and tried tying them 

 together yet.



Also, the AGATE wire book shows a "Comm Mic Return" pin 8 on P4002, 

to be joined with the Comm Audio Lo.  The Garmin manual simply shows 

that as a reserved or unused pin.


	


    Hmmmm . . . I did those drawings some years ago and

    a tech over in experimental flight installed the

    radio. A week later I noticed that the radio was

    in and working . . . but if he found any errors

    in my drawing he didn't mention them. So I'm assuming

    that the drawings are correct as depicted.



    Is it just an audio issue? Which way . . . can't talk

    or can't hear or both? Does the transmitter key when

    you press the mic button.



    Bob . . .

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dave.gribble(at)mchsi.com
Guest

Posted: Fri Feb 26, 2010 3:47 pm Post subject: GNS430 Wire Book

forgive the minor thread hijack - but what is an AGATE wire book, and where can it be downloaded from?



Thanks,



dave

---

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slipstream(at)wavecable.c
Guest

Posted: Fri Feb 26, 2010 7:46 pm Post subject: GNS430 Wire Book

I think I found my problem -- Connectivity with the plugs in the back of the rack isn't too good.  When I cut the panel, my thinking was to make my panel exactly as large as the GNS430 itself.  The rack is flush with the backside of the panel.  After figuring out that I wasn't getting a good connection, it occurred to me that the rack should be flush with the front side (display side) of the panel.  That little 1/8" of movement that I'd lost in the first setup was apparently enough to keep the comm connector, P4002, from making a good solid connection.

  

 Brooks

         [quote][b]

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