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turn coordinator causing noice in headset

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Oct 22, 2012 7:21 pm Post subject: turn coordinator causing noice in headset

At 03:21 PM 10/22/2012, you wrote:

 	  Quote: 	
		  



I have had a good deal of electrical issues from strobe noise, to 

bad crimps that burned up wires. I have slowly but surely resolved 

alot of the issues. Recently I installed an LED landing light. 

During the course I found other wiring issues that have been 

resolved too. However I have strange problem now. I can hear my 

Falcon Electronic turn coordinator in my headset. It is whining very 

noticeably. What is weird is if I turn ON the landing light, the 

noise goes away. Turn the light off and the noise comes back. I 

worked on this for hours trying various things with no luck. Here 

are some things I tried and the results.



1. re-did all the grounds on everything. No change.

2. disconnected turn coordinator. Noise gone with or without the 

landing light on.

3. disconnect comm antenna at radio pigtail. Noise is gone.

4. hooked up rubber ducky antenna totally isolated from plane and 

the noise comes back.

5. hooked up turn coordinator directly to the battery (this fixed 

the strobe noise problem) totally isolating it from the bus power 

supply. Noise is the same.


	


    Your experimental results suggest radiated noise . . .

    probably through wiring. These filters are on sale

    right now



http://tinyurl.com/8aszmkb



    Put an order in at http://tinyurl.com/36e7ddd

    I'll mail you one. If it fixes it, I'll bill you

    the $10 + postage. If not, we gotta go to plan B.

 	  Quote: 	
		  In every instance though, I can turn on the landing light and the 

noise goes away. I don't get it?


	


    Those T/C are noteworthy for their noise

    generation. You could first try installing a 0.1

    uF, capacitor (Radio Shack 272-1053) across

    the incoming power pins at the back of the

    instrument.

   Bob . . .

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jerrytex

Joined: 10 Feb 2011
Posts: 12

Posted: Wed Oct 24, 2012 6:07 am Post subject: Re: turn coordinator causing noice in headset

I tried the capacitor and it didn't make any difference. I went ahead and filled out the order for the filter and I'll give that a try. 



In response to the question about the intercom....the headset is hooked up to an intercom. I have isolated the headset jacks with plastic washers. The noise only can be heard when the radio is on. With just the intercom on, there is no noise.



Thanks again for the responses. 



Jerry

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Oct 25, 2012 8:29 am Post subject: turn coordinator causing noice in headset

At 09:07 AM 10/24/2012, you wrote:

 	  Quote: 	
		  



I tried the capacitor and it didn't make any difference. I went 

ahead and filled out the order for the filter and I'll give that a try.



In response to the question about the intercom....the headset is 

hooked up to an intercom. I have isolated the headset jacks with 

plastic washers. The noise only can be heard when the radio is on. 

With just the intercom on, there is no noise.


	


   Okay, have you tried the experiment wherein the T/C

   is powered by a separate string of dry-cells? In other

   words, have you explored the +14v power input to the

   T/C is the egress port for the interference?

   Bob . . .

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jerrytex

Joined: 10 Feb 2011
Posts: 12

Posted: Fri Oct 26, 2012 6:41 am Post subject: Re: turn coordinator causing noice in headset

No I have not hooked up the T/C to a seperate power supply. I'll try that as soon as I can and report back.

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