Snag with Dynon Sky View D1000

[Norman_Joseph]

I am experiencing a very strange snag with my new Sky View D1000 system installed in my RV9. With everything switched on, that is the SV D1000 the radios Garmin SL40 and SL30 and audio control panel I place my hand close to the SV screen, about an inch in front of it then a loud static noise is heard in my Lightspeed Headsets. The static stops as soon as I move my hand away from the screen. This occurs when I am sitting in the pilot's or passenger's seats in the aircraft. If some body outside of the aircraft not touching it places his hand in the same position no static noise occurs.
This is a newly finished home build and has done about 19 hours of flying and I do not know if this has been happening from the start of test flying as I have only noticed it now.
It is not the Sky View Touch system. I bought it in 2012 and we finished the build last year in November.

 

[Eric_Greenwell]

I had the same problem with a D700, using Dynon's radio and intercom. Moving the radios' antenna cable above other wiring behind the panel seemed to help; ultimately, I realized the radio had a problem (did not always receive transmissions), exchanged it under warranty, and intermittent screen static problem went away.

I suggest you carefully check the antenna lead, starting at the connector to the radio, and going all the way back to the antenna; and the grounding of the radio.

 

[dynonsupport]

The noise you are hearing is the squelch breaking in the SL-40. You can prove this by changing the volume on the SL-40 and the volume of the noise will change. That way you know it isn't getting in to the system after the radio.

What is happening here is that all electronics make RF noise. Designers do their best to shield that, but it's not possible to block it all. When you put your hand on or near the screen, you make a good antenna for that noise and effectively conduct it our and radiate it.

Now that you're radiating it, the radio can pick it up with the standard COM antenna. It may hardly be any additional noise, but if your squelch is right on the edge this can open it up.

There are a few possibilities here:

1) You're in a metal hangar that reflects the signal around. If so, you may find this doesn't happen when you are in flight. It could also be the hangar has noise inside it, and it's the addition of that noise and the SkyView noise that causes an issue. In a hangar with HID overhead lights, lots of radios will just open up squelch there is so much noise. Open the hangar doors and it goes away.

2) Your antenna is on the top of the plane and can "see" directly into the cockpit, instead of on the bottom where the metal of the airframe shields things.

3) Your squelch is right on the edge, and even one click higher might cause this to stop

4) You have a broken RF cable between the radio and the antenna, so that the radio can hear things inside the cabin, not just coming into the antenna. This is quite likely in your situation given you say people outside the plane don't cause this.

 

[Norman_Joseph]

Thank you both for the replies. I will check out what you say. I am in Hong Kong right now and will only get to my airplane in a couple of weeks time so will do it then and repot back.