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Static On GTN-650

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billhuntersemail(at)gmail
Guest

Posted: Fri Dec 17, 2021 3:57 pm Post subject: Static On GTN-650

Hi everyone,

     

     I bought some LED landing lights from Amazon Aircraft Supply and     they seem to produce some static noise on the GTN-650.  I have     conformed by turning on/off the landing light switch that the LEDs     are the appliance that is producing the static and I have confirmed     that the GTN is the radio that I am hearing the static through     because if I select the second radio or the third selection (that     does not have a radio) on the SL-15 audio panel the static stops.  I     do not believe the static sound is the squelch mode.

     

     The airplane is fiberglass and the power and ground wires are not     run together with the GTN wiring.

     

     The power for the lights comes from a copper bus bar and a KLIXON     CB.

     

     Is there some kind of way to filter out the noise?

     

     THANKS for your help and advice!!!

     

     Bill

user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Fri Dec 17, 2021 4:57 pm Post subject: Re: Static On GTN-650

Are audio jacks mounted with insulating washers to prevent them from being grounded locally?

_________________
Joe Gores

cluros(at)gmail.com
Guest

Posted: Fri Dec 17, 2021 5:04 pm Post subject: Static On GTN-650

Another thing is we ordered about twice as many lights as needed and picked the ones with the lowest noise.



On Fri, Dec 17, 2021 at 5:03 PM Sebastien <cluros(at)gmail.com (cluros(at)gmail.com)> wrote:



 	  Quote: 	
		  We had the same problem with our amazon lights making noise in the intercom. Better headsets helped, finding one wiring problem in the intercom wiring helped, but the biggest fix was adding some noise filters to the lights. Here's the little filter box I made. It's not a great diagram, the box around the electronics is not wiring, it's a box.



On Fri, Dec 17, 2021 at 4:02 PM William Hunter <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:



 	  Quote: 	
		                     Hi everyone,

     

     I bought some LED landing lights from Amazon Aircraft Supply and     they seem to produce some static noise on the GTN-650.  I have     conformed by turning on/off the landing light switch that the LEDs     are the appliance that is producing the static and I have confirmed     that the GTN is the radio that I am hearing the static through     because if I select the second radio or the third selection (that     does not have a radio) on the SL-15 audio panel the static stops.  I     do not believe the static sound is the squelch mode.

     

     The airplane is fiberglass and the power and ground wires are not     run together with the GTN wiring.

     

     The power for the lights comes from a copper bus bar and a KLIXON     CB.

     

     Is there some kind of way to filter out the noise?

     

     THANKS for your help and advice!!!

     

     Bill

cluros(at)gmail.com
Guest

Posted: Fri Dec 17, 2021 5:04 pm Post subject: Static On GTN-650

We had the same problem with our amazon lights making noise in the intercom. Better headsets helped, finding one wiring problem in the intercom wiring helped, but the biggest fix was adding some noise filters to the lights. Here's the little filter box I made. It's not a great diagram, the box around the electronics is not wiring, it's a box.



On Fri, Dec 17, 2021 at 4:02 PM William Hunter <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:



 	  Quote: 	
		                     Hi everyone,

     

     I bought some LED landing lights from Amazon Aircraft Supply and     they seem to produce some static noise on the GTN-650.  I have     conformed by turning on/off the landing light switch that the LEDs     are the appliance that is producing the static and I have confirmed     that the GTN is the radio that I am hearing the static through     because if I select the second radio or the third selection (that     does not have a radio) on the SL-15 audio panel the static stops.  I     do not believe the static sound is the squelch mode.

     

     The airplane is fiberglass and the power and ground wires are not     run together with the GTN wiring.

     

     The power for the lights comes from a copper bus bar and a KLIXON     CB.

     

     Is there some kind of way to filter out the noise?

     

     THANKS for your help and advice!!!

     

     Bill

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art(at)zemon.name
Guest

Posted: Sun Dec 19, 2021 5:41 am Post subject: Static On GTN-650

Some LED lights are, indeed, incredibly noisy. My son discovered that they pretty much trash garage door openers with RF interference. With cheap LED bulbs installed in the garage door opener, it was well nigh impossible to close the door using the remote in the car because the light was on. We have both switched to a different brand of LED lights in our garage doors and voila! both are now working properly again. Once again, the lesson seems to be that you get what you pay for.

    -- Art Z.





On Fri, Dec 17, 2021 at 7:29 PM Sebastien <cluros(at)gmail.com (cluros(at)gmail.com)> wrote:



 	  Quote: 	
		  We had the same problem with our amazon lights making noise in the intercom. Better headsets helped, finding one wiring problem in the intercom wiring helped, but the biggest fix was adding some noise filters to the lights. Here's the little filter box I made. It's not a great diagram, the box around the electronics is not wiring, it's a box.



On Fri, Dec 17, 2021 at 4:02 PM William Hunter <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:



 	  Quote: 	
		                     Hi everyone,

     

     I bought some LED landing lights from Amazon Aircraft Supply and     they seem to produce some static noise on the GTN-650.  I have     conformed by turning on/off the landing light switch that the LEDs     are the appliance that is producing the static and I have confirmed     that the GTN is the radio that I am hearing the static through     because if I select the second radio or the third selection (that     does not have a radio) on the SL-15 audio panel the static stops.  I     do not believe the static sound is the squelch mode.

     

     The airplane is fiberglass and the power and ground wires are not     run together with the GTN wiring.

     

     The power for the lights comes from a copper bus bar and a KLIXON     CB.

     

     Is there some kind of way to filter out the noise?

     

     THANKS for your help and advice!!!

     

     Bill

     

     

     

     

     

    

	


 	


-- 

My blog: CheerfulCurmudgeon.com

The good is already there. Practicing gratitude means being fully aware of the good that is already yours.

millner(at)me.com
Guest

Posted: Sun Dec 19, 2021 7:51 pm Post subject: Static On GTN-650

Art Zemon wrote: the lesson seems to be that you get what you pay for.



Hi Art!



That's never been the lesson. Though, it is true that you seldom get 

MORE than you pay for. I think the LEDs were probably innocent... 

rather, it's the poorly filtered power supplies for the LEDs that caused 

the interference. Perhaps that is a distinction without a difference, 

but the LED itself is pretty interference free... but beware the support 

system!



Paul, Thailand remote

billhuntersemail(at)gmail
Guest

Posted: Mon Dec 20, 2021 8:31 am Post subject: Static On GTN-650

>but the biggest fix was adding some noise filters to the lights.

     

     Is there a filter available for purchase specific to this type of     problem?

     

     THANKS

     

     Bill

     

     On 12/17/2021 6:03 PM, Sebastien wrote:

     

      	  Quote: 	
		  but       the biggest fix was adding some noise filters to the lights.

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Dec 20, 2021 9:29 am Post subject: Static On GTN-650

At 10:30 AM 12/20/2021, you wrote:

  	  Quote: 	
		  >but the biggest fix was adding some noise filters to the lights.



 Is there a filter available for purchase specific to this type of problem? 	


   So you know how the noise is getting into the avionics?

   Through the antenna(s), ground loops or conducted power?

   Refresh my memory, what combination of lights/power supplies

   are being discussed?



   Way back when, the BuckPuck was a popular but noisy

   power supply for some DIY nav lights. We crafted

   a filter assembly for that product which sold rather

   well for a time.



  http://aeroelectric.com/Pictures/Lighting/Buck-Puck/



   This was for radiated noise that found it's way

   in through antennas. I've got some residual

   ecbs around here for another filter that used

   surface mounted parts that also tamed radiated

   noise from some auto-led conversions installed

   as landing/taxi lights.



   



 



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

eschlanser

Joined: 08 Apr 2010
Posts: 60

Posted: Mon Dec 20, 2021 9:31 am Post subject: Re: Static On GTN-650

 	  cluros(at)gmail.com wrote: 	
		  We had the same problem with our amazon lights making noise in the intercom. Better headsets helped, finding one wiring problem in the intercom wiring helped, but the biggest fix was adding some noise filters to the lights. Here's the little filter box I made. It's not a great diagram, the box around the electronics is not wiring, it's a box.    

	
[/quote]

Can anyone help me understand what the component symbols and numbers in the diagram refer to? I understand that they refer to components in the diagram, but what are they? I could not find them in review of electrical component symbols and the associated numbers.

A picture of the completed device would help a DIY builder understand it. if its not too much trouble. 

As the OP asked, if anyone is aware of a reference to a commercially available device, it would be appreciated.



I'm a little surprised that the GTN 650 would be susceptible to such interference. I wonder if the Garmin help technicians have anything to say about it? Many years ago, my little GPS 92 would go blank whenever I tuned the nav radio to our home field VOR frequency. Astonishingly, the Garmin help tech denied such a thing could be happening. 

Thanks,Eric

billhuntersemail(at)gmail
Guest

Posted: Mon Dec 20, 2021 10:08 am Post subject: Static On GTN-650

>So you know how the noise is getting into the avionics?        Through the antenna(s), ground loops or conducted power?

       

     I do not how the noise is getting to the GTN.  

     

     

     >Refresh my memory, what combination of lights/power supplies are     being discussed?

     

     The fiberglass airplane has a B&C alternator and it feeds power     to two "ships power" copper bus bars with Klixon circuit breakers     and one of these circuit breakers feeds the LED landing light.  

     

     The avionics copper bus bar gets its power from one of the ships     power copper bus bars through a LT-100 Honeywell switch that feeds     the avionics copper bus bar that powers the GTN, transponder, ADS-B,     and the SL-15 audio panel.

     

     The switch panel for aircraft lighting is in the overhead and the     power from the overhead switch panel is routed in a different     location than the GTN radio unit and power wires however there is     one location where the LED power and ground wires will cross the     antenna coax cable for the radio however the wires do not run     parallel to the coax cable just at a 90 degree angle.

     

     The audio panel is a SL-15 and I have a Dynon radio that is quiet     when the LED landing light is turned on.  If I select the GTN for     the transmit/receive then I hear the static.  When I turn off the     landing light switch the static stops.

     

     How would one (me) be able to determine the source of the static?

     

     

      The lights in question are theses:

     

 https://www.amazon.com/gp/product/B01H6Z2XZ6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

     

     

     Again...always grateful for the help!!!

     

     On 12/20/2021 10:29 AM, Robert L.       Nuckolls, III wrote:

     

      	  Quote: 	
		                At 10:30 AM 12/20/2021, you wrote:

               	  Quote: 	
		  >but           the biggest fix was           adding some noise filters to the lights.

           

           Is there a filter available for purchase specific to this type           of           problem? 	
       

         So you know how the noise is getting into the avionics?

         Through the antenna(s), ground loops or conducted power?

         Refresh my memory, what combination of lights/power supplies

         are being discussed?

       

         Way back when, the BuckPuck was a popular but noisy

         power supply for some DIY nav lights. We crafted

         a filter assembly for that product which sold rather

         well for a time.

       

                http://aeroelectric.com/Pictures/Lighting/Buck-Puck/

       

         This was for radiated noise that found it's way

         in through antennas. I've got some residual

         ecbs around here for another filter that used

         surface mounted parts that also tamed radiated

         noise from some auto-led conversions installed

         as landing/taxi lights.

       

         

       

       

       

       

                

             Bob . . .

             

               Un impeachable logic: George Carlin asked, "If black             boxes

               survive crashes, why don't they make the whole airplane

               out of that stuff?"

Ceengland

Joined: 11 Oct 2020
Posts: 380
Location: MS

Posted: Mon Dec 20, 2021 10:52 am Post subject: Static On GTN-650

snip

 	  Quote: 	
		  

 How would one (me) be able to determine the source of the static?



snip
	


If you have or can borrow a spare 12V battery (could be a small one), 

disconnect the feeder to the lights at the CB, and connect it to the 

spare battery. Ground the spare battery at the common ground point in 

the fuselage.



If you power up the a/c and there's no noise in the radio, then the 

noise is likely coming in through the power wires. If you still have the 

noise, it's likely getting radiated & detected by the radio.



-- 

This email has been checked for viruses by Avast antivirus software.

https://www.avast.com/antivirus

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Charlie

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