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Flightcom 403 Aux inputs

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pete.howell(at)gecko-grou
Guest

Posted: Sun Apr 30, 2006 9:07 pm Post subject: Flightcom 403 Aux inputs

I am wiring the aux inputs to my FC 403 intercom (stereo)  I have garmin 396

(st), Trafficscope VRX (st), ipod(st), GRT EIS 4000(Mono).  I have them each

isolated with a 150 Ohm R and a 10 uF cap.  396 and ipod will not be used at

the same time. It all works pretty well except when the Trafficscope is

hooked up, I get a low level tone - not really the classic ground loop hum.

The voices are clear when the traffic alerts kick in, but the low level tone

is always there.  My next step is the iso amp, but I thought I would try to

make this passive network work first.



One other question - could an unused mic input be used for the mono EIS

warning tone.



Thanks,



Pete

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rv8ch

Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

Posted: Sun Apr 30, 2006 11:35 pm Post subject: Flightcom 403 Aux inputs

 	  Quote: 	
		   

 

 I am wiring the aux inputs to my FC 403 intercom (stereo)  I have garmin 396

 (st), Trafficscope VRX (st), ipod(st), GRT EIS 4000(Mono).  I have them each

 isolated with a 150 Ohm R and a 10 uF cap.  396 and ipod will not be used at

 the same time. It all works pretty well except when the Trafficscope is

 hooked up, I get a low level tone ...

 

 One other question - could an unused mic input be used for the mono EIS

 warning tone.


	


I hope so - that's what I'm planning to do.  I was going to pop the

question about how to do it when I got a bit closer, but now that

you've brought it up...



What needs to be done to have mono warning tones like the EIS 4000

or AOA indicator going into an unused mic input?



Thanks,

Mickey



-- 

Mickey Coggins

http://www.rv8.ch/

#82007 finishing

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Mickey Coggins
http://www.rv8.ch/

klehman(at)albedo.net
Guest

Posted: Mon May 01, 2006 4:03 am Post subject: Flightcom 403 Aux inputs

The EIS 4000 outputs a 12 volt square wave for a tone so it will drive 

pretty much anything. I needed a 470k (half meg) resistor to reduce the 

volume and connect mine to a different model intercom.

Ken



Mickey Coggins wrote:



 	  Quote: 	
		  



  



>

>

>I am wiring the aux inputs to my FC 403 intercom (stereo)  I have garmin 396

>(st), Trafficscope VRX (st), ipod(st), GRT EIS 4000(Mono).  I have them each

>isolated with a 150 Ohm R and a 10 uF cap.  396 and ipod will not be used at

>the same time. It all works pretty well except when the Trafficscope is

>hooked up, I get a low level tone ...

>

>One other question - could an unused mic input be used for the mono EIS

>warning tone.

>    

>



I hope so - that's what I'm planning to do.  I was going to pop the

question about how to do it when I got a bit closer, but now that

you've brought it up...



What needs to be done to have mono warning tones like the EIS 4000

or AOA indicator going into an unused mic input?



Thanks,

Mickey

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Mon May 01, 2006 5:35 am Post subject: Flightcom 403 Aux inputs

On May 1, 2006, at 12:31 AM, Mickey Coggins wrote:

 	  Quote: 	
		  >

> One other question - could an unused mic input be used for the  

> mono EIS

> warning tone.

 I hope so - that's what I'm planning to do.  I was going to pop the

 question about how to do it when I got a bit closer, but now that

 you've brought it up...

 What needs to be done to have mono warning tones like the EIS 4000

 or AOA indicator going into an unused mic input?

There are a couple of things to think about when wiring up alert  

inputs. Remember that a passenger mic input may be silenced/muted by  

pressing the PTT or by throwing the "pilot isolate" or "crew isolate"  

switch on the intercom. Frankly, you don't want to be able to mute  

your warning audio by accident.

Some audio panels have an always-on input for alert audio. If not  

then you want to pipe the audio into your intercom in such a way that  

it cannot be muted. In that case you want to mix your alert audio  

with audio from your audio panel at the input to your intercom. Since  

most (all?) intercoms have a fail-safe routing for audio to the  

pilot, that is probably the best thing to do.

It is probably best to look at all your sources of audio in the  

cockpit and ask yourself what you want to do with each and then work  

from there to ensure you get what you want.

Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .

 Antoine de Saint-Exupry

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

trigo(at)mail.telepac.pt
Guest

Posted: Mon May 01, 2006 11:53 am Post subject: Flightcom 403 Aux inputs

Pete



I have the same problem(s) to solve, therefore I'm looking forward to see 

the answers to your questions.

Meanwhile, please explain to an electronics ignorant like me what do you 

mean by "... I have them each isolated with a 150 Ohm R and a 10 uF cap."?

Did you connect each wire from each source through a resistance and a 

capacitor (in series) all to the aux input (pin 18 or pin 19?) of the 

intercom?



Carlos

---

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pete.howell(at)gecko-grou
Guest

Posted: Tue May 02, 2006 4:24 am Post subject: Flightcom 403 Aux inputs

After some experientation (and good advice from some EE buddies -

thanks Vern) here is what worked pretty well.   Each of the inputs

have a 1000 Ohm resistor and a 10uF cap in series with the input. 

The exception to this is the EIS tone that just has a 150 Ohm and the

10uF cap.  I tried without success to get the warning tone piped into

pin 21 of the FC403 to make it unmuted.  In the end, I was happy with

this as it allows me to silence the music and warnings with one flip

of the isolate switch.    The EIS also has a warning light to alert

me of engine issues.  This setup provides minimal Background noise

and the radios, trafficscope, and EIS each have sufficient volume.



Pete

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RURUNY(at)aol.com
Guest

Posted: Thu May 11, 2006 6:25 pm Post subject: Flightcom 403 Aux inputs

Pete or anyone,

 

I have a 403 MC with one aux input into it. I will be putting the audio out  

from my Dynon

D10-A, Music input, and the GRT EIS  tone into this input. I bought  the 

components

recommended by Pete below. I'm figuring that these components will isolate  

each input 

from the other but could someone explain the math and reasoning for doing  

this. I would also

like to see the best way of incorporating these components in the  

installation, maybe just soldered together and wrapped in heatshrink at the  input to 

the intercom, or should these be mounted on a separate board? Thanks  for the 

help. 

 

Brian Unruh

Long Island

Zenith 701 85%

 

After some experientation (and good advice from some EE buddies -

thanks  Vern) here is what worked pretty well.   Each of the inputs

have a  1000 Ohm resistor and a 10uF cap in series with the input. 

The exception to  this is the EIS tone that just has a 150 Ohm and the

10uF cap.  I tried  without success to get the warning tone piped into

pin 21  of the FC403 to make it unmuted.  In the end, I was happy  with

this as it allows me to silence the music and warnings with one  flip

of the isolate switch.    The EIS also has a warning  light to alert

me of engine issues.  This setup provides minimal  Background noise

and the radios, trafficscope, and EIS each have sufficient  volume.



Pete

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