SV-Intercom-2S

[knut]

At the moment I install a SV system in my RV-9A. Installed is also a SV-Intercom-2S. The radio SV-COM-X83 still follows.
I have a slight humming noise in intercom depending on the brightness of the SV-D1000 displays. If I turn the display darker the hum gets louder. At 100% brightness no more hum is heard. The huming noise is not really disturbing but is it normal?

Regrds Knut

 

[dynonsupport]

This is usually indicative of a grounding issue. Try adding a ground strap to the ground lug on the back of your SkyView display(s).

At the moment I install a SV system in my RV-9A. Installed is also a SV-Intercom-2S. The radio SV-COM-X83 still follows.
I have a slight humming noise in intercom depending on the brightness of the SV-D1000 displays. If I turn the display darker the hum gets louder. At 100% brightness no more hum is heard. The huming noise is not really disturbing but is it normal?

Regrds Knut

 

[knut]

I did that, no change. The huming noise occurs between +4 and -5 in brightness and is most strongly at 0 to -2. Whereby it is not really strong and disturbing.
I want to install two SV-D1000. The two D-37 harnesses are already installed and the cable to the radio are also installed. But one SV-D1000 display is still missing (because of warranty) and also the radio SV-COM-X83 is not yet connected. Can these missing devices be the reason?

 

[dynonsupport]

If there are loose audio connections, such as an uninstalled radio, that could be causing hum and other issues.

I did that, no change. The huming noise occurs between +4 and -5 in brightness and is most strongly at 0 to -2. Whereby it is not really strong and disturbing.
I want to install two SV-D1000. The two D-37 harnesses are already installed and the cable to the radio are also installed. But one SV-D1000 display is still missing (because of warranty) and also the radio SV-COM-X83 is not yet connected. Can these missing devices be the reason?

 

[Skypilot46]

Was this problem ever resolved?
We are just finishing up an RV8A with a D700 and Flitecom 403 I/C. We have exactly the same problem....a high freq hum in both headsets, maybe around 400hz, that goes away only when the screen brightness is above +2 or the I/c is switched to "isolate". Have been rechecking grounds and ran a ground strap from the avionics ground buss to the D700 casing. Still there. Is there another solution?

 

[dynonsupport]

You need a really good ground from your D700 to your Intercom. Get a really good ground between the two of those, not between the D700 and a different ground. You can start with just a 14 gauge or higher wire pressed to the D700 case and the intercom case to prove it before you do more work to make it permanent.