email(at)jaredyates.com
Guest
|
 Posted: Mon Apr 18, 2011 10:15 am Post subject: AEC9009 Audio Iso Amp Wiring, especially Shielded Wires |
 |
|
AEC questions
I'm wiring the AEC 9009 Audio Iso Amp and want to be sure that I'm doing it correctly. I don't understand entirely about how and when wires need to be shielded in this case. I have a single Nav/Com (GNS430), a Flightcom 403 stereo intercom, a pilot position with a push-to-talk, a co-pilot position with a push-to-talk, and two back seat passengers. Inputs to the 9009 are the Dynon warning tones from the HS34, the 430 Nav audio, and a stereo ipod jack.
Here's my wiring plan so far:
1. Connect the dynon HS34 tone output with a single-wire shielded cable at the 9009's pin 4(center conductor) and 10(sheild), leaving the Dynon's end of the shielded cable not connected to anything.
2. Use another single-wire shielded cable to connect the 430 Nav Audio Hi output to the 9009's pin 2(center conductor) and the Nav Audio Lo to the 9009 pin 11(shield). Is this correct, or do I need two conductors and a shield, with the shield wired as per 1 (connected at 9009, clipped at the other end)?
3. Connect a 3.5mm stereo jack to the 9009 with a 2-wire shielded cable: one conductor from the jack to 9009 pin 1, one conductor from the jack to 9009 pin 5, and the shield from the 3.5mm jack's ground to pin 12 on the 9009 (and the jack isolated from the airframe ground). Same question as number 2- Is this correct? Do I instead need to run a 3-wire shielded cable, with the third conductor connected to the jack's ground, and the shield wired as in number 1 above?
4. Run the left and right outputs of the 9009 (pins 7 and 6) to the flightcom's aux input channels. What about shields here? Should I run a single cable with two wires, or does each conductor need to be in its own shield?
5. Run the power to pin 8 on the 9009 with a 22AWG wire that is crimped in the same faston terminal as the intercom's power line so that they share a 1A fuse.
6. Wire the rest of the audio system (pilot, copilot, pax mic/phone jacks) per the flightcom directions, using 3-wire shielded cable with the jacks isolated from the airframe. What do I need to do with the shields?
The Flightcom manual says that it has fail safe wiring that connects the pilot jacks to the radio if the intercom loses power, so I was planning to skip the fail-safe jacks described in the AEC9009 literature. Is there any other reason why I would want to include them? I can think of two cases where they would be useful. First, as described in the flightcom manual, if the intercom were to become inop and I removed it to send it away, I could still fly the airplane with a single functioning headset by using the directly wired jacks. If I omit the direct jacks, then this feature would not be available. Second, if the intercom failsafe system were to fail and the intercom were to both fail at the same time, I would be unable to use the 430's Com and would have to resort to the backup handheld and its headset adapter cord. Both of these circumstances seem pretty unlikely, and I think I'm willing to live without a solution for them. Are there any other good reasons to have the failsafe jacks that I might be forgetting about?
My plan is to keep the 430 com functions out of the 9009 completely, since the intercom has channels for xmit and receive audio. This will keep the AEC out of the equation, and if it becomes inop then VHF communications will not be effected. Is there any reason why I shouldn't do it this way?
[quote][b]
| | - 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 |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
