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EIS 4000 tone

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pete.howell(at)gecko-grou
Guest

Posted: Wed May 31, 2006 9:37 am Post subject: EIS 4000 tone

I have the audio output of my EIS 4000 hooked up thru my Flightcom

403 intercom.   As soon as the EIS powers up, I have a tone that is

constant.  It is maybe 1/4 (very subjective)as loud as the actual

warning tone(I thought it WAS the warning tone before I set the

limits on the EIS and heard the actual tone).   Any thoughts how to

get rid of it?   I have isolated various audio inputs with a 510K

resistor before feeding them into the aux audio.  I know it is the

EIS b/c if I power the EIS down, the tone goes away.



Thanks,



Pete

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noelloveys(at)yahoo.ca
Guest

Posted: Wed May 31, 2006 11:35 am Post subject: EIS 4000 tone

Sounds like you are getting a tone from the microprocessor in the EIS.  Make

sure the CPU of the EIS is in a properly installed grounded case.  Also the

power supply for your intercom should be off it's own circuit breaker.  One

last thing is the wire connections to your intercom should all be shielded

and the shield should be grounded at one end only.  Yes not at both ends but

only one end.  



If you still get the tone you may have to put a choke on your B+ to the

intercom.



Noel



[quote] --

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craig(at)craigandjean.com
Guest

Posted: Wed May 31, 2006 1:52 pm Post subject: EIS 4000 tone

Can you describe the frequency of the tone? Low hum, musical note,

high-pitched whine?



-- Craig

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luckymacy(at)comcast.net
Guest

Posted: Thu Jun 01, 2006 2:25 am Post subject: EIS 4000 tone

There's a Grand Rapids Tech. product user group on Yahoo that you can look up using



GRT_EFIS



It's not a EFIS only users group so you can join and ask and EIS question you want and search the archives for that matter.



Lucky

-------------- Original message -------------- 

From: "Pete Howell" <pete.howell(at)gecko-group.com> 



 	  Quote: 	
		   

 

 

 

 I have the audio output of my EIS 4000 hooked up thru my Flightcom 

 403 intercom. As soon as the EIS powers up, I have a tone that is 

 constant. It is maybe 1/4 (very subjective)as loud as the actual 

 warning tone(I thought it WAS the warning tone before I set the 

 limits on the EIS and heard the actual tone). Any thoughts how to 

 get rid of it? I have isolated various audio inputs with a 510K 

 resistor before feeding them into the aux audio. I know it is the 

 EIS b/c if I power the EIS down, the tone goes away. 

 

 Thanks, 

 

 Pete 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<html><body>
	


<DIV>There's a Grand Rapids Tech. product user group on Yahoo that you can look up using</DIV>

<DIV>&nbsp;</DIV>

<DIV>GRT_EFIS</DIV>

<DIV>&nbsp;</DIV>

<DIV>It's not a EFIS only users group so you can join and ask and EIS question you want and search the archives for that matter.</DIV>

<DIV>&nbsp;</DIV>

<DIV>Lucky</DIV>

<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: "Pete Howell" &lt;pete.howell(at)gecko-group.com&gt; <BR><BR>&gt; --&gt; AeroElectric-List message posted by: "Pete Howell" <BR>&gt; <PETE.HOWELL(at)GECKO-GROUP.COM><BR>&gt; <BR>&gt; <BR>&gt; I have the audio output of my EIS 4000 hooked up thru my Flightcom <BR>&gt; 403 intercom. As soon as the EIS powers up, I have a tone that is <BR>&gt; constant. It is maybe 1/4 (very subjective)as loud as the actual <BR>&gt; warning tone(I thought it WAS the warning tone before I set the <BR>&gt; limits on the EIS and heard the actual tone). Any thoughts how to <BR>&gt; get rid of it? I have isolated various audio inputs with a 510K <BR>&gt; resistor before feeding them into the aux audio. I know it is the <BR>&gt; EIS b/c if I power the EIS down, the tone goes away. <BR>&gt; <BR>&gt; Thanks, <BR>&gt; <BR>&gt; Pete <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; 

 <BR>&g

 ======

================================ <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; </BLOCKQUOTE></body></html>

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pete.howell(at)gecko-grou
Guest

Posted: Thu Jun 01, 2006 4:32 am Post subject: EIS 4000 Tone

It is a high pitched whine.   I think it might be the microprocessor,

as suggested.   I'm working with the folks at GRT on it as well.

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