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Continuous Squelch Noise With SV-1000 Display On

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ceengland7(at)gmail.com
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Posted: Mon Feb 05, 2018 8:41 am Post subject: Continuous Squelch Noise With SV-1000 Display On

On 2/5/2018 10:22 AM, William Hunter       wrote:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

I am getting a continuous squelch type             noise when I have one of the Dynon screens receiving ships             power.          

          

The Avionics system is two Skyview SV1000             displays, a Dynon radio, a Garmin GTN - 650, and an SL-15             audio panel.          

          

The squelch noise is continuous             regardless if the engine is running or not so I have             eliminated any noise from the alternator system. And I have             also disconnected any battery chargers so that the system is             running only on airplane battery.  I also turned off all             shop lights         

          

When I first fired up the system it             sounded like the squelch was activated on a radio meaning             the continuous White Noise sound was in the headsets and/ or             the overhead speaker however when somebody would talk on the             radio the white noise would go away and the transmission             would come out completely clear.   The nose is loud and is             exactly the same sound the radios make when the squelch             switch is in the squelch position…so I thought it was the             squelch button/switch.         

          

I turned off the Dynon radio and I also             turned off the Garmin and the sound continued so those             sources of either noise and or squelch were eliminated.          

          

I began pulling all of the circuit             breakers out one at a time and the sound continued until I             pulled out the circuit breaker that powers the left side              Dynon screen. The squelch noise stopped even though the             backup battery was powering the display.          

          

Push the circuit breaker in and the noise             started again...pull out the CB and the noise stops and the             screen stays on using its backup battery power.         

          

So I have confirmed that the only source             of noise in the headsets is when the circuit breaker for the             left screen is pushed in.          

          

Someone on the Dynon forum suggested that             it could be a ground loop.  The airplane is a composite and             all of the ground wires from the instrument panel go to one             copper bus bar near the instrument panel and then from the             ground bus I have a 12 AWG wire going to the battery             negative cable.         

          

Does anybody have any recommendations for             troubleshooting in addition to what I have done thus far?         

          

AS ALWAYS…Thanks for any feedback,             experience, and or suggestions!         

          

..         

          

Cheers!!!         

          

Bill  Hunter         

          

          

          

        

     	
     You said 'left side Dynon'. Do you have a pair? If so, can you swap     units left/right & repeat the test? If the noise follows the     box, then there's likely a defect in the box itself (probably has a     'switcher' power supply inside that's generating the white noise).     If the internal backup battery is something lower than 12V, like a     4.5V or 6V battery, that would raise the odds that it's an internal     switching type power supply generating the noise.

     

     If the noise doesn't follow the box, then I'd start looking at     wiring.

     

     Charlie

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Mon Feb 05, 2018 12:53 pm Post subject: Continuous Squelch Noise With SV-1000 Display On

I strongly suggest calling Dynon directly. Their tech support is first 

rate. Tech support best deals with specific problems over the phone, 

while their forum is better for general problems.

The back up battery is 12 V, 12.25 when fully charged.

I have same system, except SL30 and GTN 650, no Dynon radio, and PS Eng 

intercom/audio panel.

On 2/5/2018 9:45 AM, Charlie England wrote:

 	  Quote: 	
		   On 2/5/2018 10:22 AM, William Hunter wrote:

>

> I am getting a continuous squelch type noise when I have one of the 

> Dynon screens receiving ships power.

>

> The Avionics system is two Skyview SV1000 displays, a Dynon radio, a 

> Garmin GTN - 650, and an SL-15 audio panel.

>

> The squelch noise is continuous regardless if the engine is running or 

> not so I have eliminated any noise from the alternator system. And I 

> have also disconnected any battery chargers so that the system is 

> running only on airplane battery.  I also turned off all shop lights

 	  Quote: 	
		   You said 'left side Dynon'. Do you have a pair? If so, can you swap 

 units left/right & repeat the test? If the noise follows the box, then 

 there's likely a defect in the box itself (probably has a 'switcher' 

 power supply inside that's generating the white noise). If the internal 

 backup battery is something lower than 12V, like a 4.5V or 6V battery, 

 that would raise the odds that it's an internal switching type power 

 supply generating the noise.

 If the noise doesn't follow the box, then I'd start looking at wiring.

 Charlie

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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