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Electrcal interference

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steven.pitt2(at)ntlworld.
Guest

Posted: Sat Feb 04, 2006 4:43 am Post subject: Electrcal interference

Dear All

I am just completing my panel and fired up everything (except engine) to check no sparks or failures.

I have an electric turn coordinator and it is noticeable that I get the sound of the giro in my headset (most of it can be squelched out) but it is most noticeable when I hold a handheld radio inside or outside the aircraft (not plugged in to the aircraft electrics). Does anyone have a remedy / reason for this?

Thanks

Steve Pitt #403

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Sat Feb 04, 2006 12:44 pm Post subject: Electrcal interference

Hi! Stephen

We have just had a long debacle on the Jabiru Engine forum about this

problem. The final outcome was that if your Turn Co-ordinator has a

Chinese motor in it there's no way you will get rid of the noise!(except

buy a more up market piece of gear)

I make do with a bog standard bubble turn and slip indicator.

Regards

Bob Harrison G-PTAG Europa MKI/Jabiru 3300



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n3eu(at)comcast.net
Guest

Posted: Mon Feb 06, 2006 6:11 am Post subject: Electrcal interference

Steven Pitt wrote:

 	  Quote: 	
		   ...

 I have an electric turn coordinator and it is noticeable

 that I get the sound of the giro in my headset (most of it

 can be squelched out) but it is most noticeable when I

 hold a handheld radio inside or outside the aircraft....


	


The little motor in the TC is causing all that?  Perhaps

it's defective; I don't think I could duplicate that

phenomenon with my 18V portable power tools.



Google up: ferrite core "noise suppressor"  You may have a

charger for a consumer device with one of these around the

wire.  Try popping off the suppressor and testing it on the

14V and GND wire pair at the back of the gyro.



Reg,

Fred F.

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ami(at)mcfadyean.freeserv
Guest

Posted: Mon Feb 06, 2006 3:25 pm Post subject: Electrcal interference

I have that 'problem' on two aircraft. But in both instances the noise has 

been getting in directly to the microphone, possibly due to its frequency 

and being very directionally sourced from close to the pilot's microphone.



You could disprove this theory by listening to the problem from outside of 

the cockpit with the door closed (and headsets on and on the ground!)

Duncan McF.

---

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