Jackkclark
Well Known Member
No Smoke! ...but loud high pitch whine in headset.
I searched both VAF and Dynon blogs and tried most of the ideas.
Hear is a summary of the test.
1) remove Fuel Pump fuse
2) turn on master
Skyview powers up automatically....running on battery. No other source of power connected.
3) turn on avionics switch (all other switches off)
4) turn on radio...high pitch squeal begins. Reminds me of "Deliverance." The sound has a rhythmic or cyclical pattern heard over and over.
5) whine is not affected by radio volume.
6) neither is it affected by the radio squelch. Nothing i do on the radio changes the whine...push PTT...change frequencies...push menu...etc.
7) Power off Skyview...whine volume increase somewhat.
8) Pulled each fuse one at a time. Noting affected the noise until I pulled the Audio fuse. Whine stopped. Radio stayed on. Ran squelch up to max and static was loud. Ran squelch back to normal.
Replaced Audio fuse....whine STILL OFF....WEIRD!
turned radio off and moved headset to co-pilot side.
Radio on.....whine again.
Removed Audio fuse....whine stopped.....replaced fuse whine still off.
Avionics switch off...and back on...whine again.
Unplugged the molex connectors to both co-pilot and pilot side jacks. Checked for continuity. No continuity between nut and ground. Re-plugged both molex connectors...just for kicks check continuity again. Had continuity. Assume that is the way it should be???
The two ground connections from the jacks to the ribs are tight.
Other Suggestions?
I searched both VAF and Dynon blogs and tried most of the ideas.
Hear is a summary of the test.
1) remove Fuel Pump fuse
2) turn on master
Skyview powers up automatically....running on battery. No other source of power connected.
3) turn on avionics switch (all other switches off)
4) turn on radio...high pitch squeal begins. Reminds me of "Deliverance." The sound has a rhythmic or cyclical pattern heard over and over.
5) whine is not affected by radio volume.
6) neither is it affected by the radio squelch. Nothing i do on the radio changes the whine...push PTT...change frequencies...push menu...etc.
7) Power off Skyview...whine volume increase somewhat.
8) Pulled each fuse one at a time. Noting affected the noise until I pulled the Audio fuse. Whine stopped. Radio stayed on. Ran squelch up to max and static was loud. Ran squelch back to normal.
Replaced Audio fuse....whine STILL OFF....WEIRD!
turned radio off and moved headset to co-pilot side.
Radio on.....whine again.
Removed Audio fuse....whine stopped.....replaced fuse whine still off.
Avionics switch off...and back on...whine again.
Unplugged the molex connectors to both co-pilot and pilot side jacks. Checked for continuity. No continuity between nut and ground. Re-plugged both molex connectors...just for kicks check continuity again. Had continuity. Assume that is the way it should be???
The two ground connections from the jacks to the ribs are tight.
Other Suggestions?