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Planes => Autopilots => Feiyu Tech => Topic started by: BigT on January 25, 2014, 01:36:57 PM

Title: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: BigT on January 25, 2014, 01:36:57 PM
I have the latest FY-41AP with the latest firmware installed in a new model Skywalker 1900.  The set up: The Immersion 600 mw Vtx with skew aerial is on the rear mounting pad and the camera is on the front pod.  I have an LC filter right next to the Vtx with 30 mils of wire between it and the Vtx.  The video loom runs past the "Autopilot Black Box" and the Radio Rx is in the wing mount box, the Power Monitor is next to the Esc adjacent to the LiPo.  The wiring harnesses, radio and video, run down each side of the fuselage.
The Problem:
I have diagonal lines (45 degrees) superimposed across the image that move (roll?) vertically up and down the screen and rhythmically pulse strong to weak to strong.  So the lines roll upwards fade to nothing then fade back as they roll down the screen.
Tried so far:
Checked for an earth loop, changed the camera, changed the Vtx, moved the esc and the power monitor, changed the goggles for a monitor, tried another pair of goggles, finally took the FY-41 out of the video loop which cured the problem but means no OSD.
Question:
Is this a known problem with the FY-41 or is mine faulty?

All help thankfully received
Regards
Tim
Title: Re: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: Gundummy on January 26, 2014, 03:24:57 PM
BigT

No issues with mine however i have had the diagonal line issue when setting up other platforms when VTX is to close to Goggles or VRX?

Title: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: BigT on January 27, 2014, 08:51:27 AM
. I have fitted a lc filter in the vtx power line, ferrite rings on all other video lines. Strangely when I installed the rings the lines changed corners!  I believe the issue is the power module. Anyone else had this


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Title: Re: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: euwan on March 01, 2014, 06:01:14 PM
Just wondering if this was the problem you were having FY-41AP OSD Problems (http://www.youtube.com/watch?v=8tgcvvgUI-c#) if so I did you solve it?
Title: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: BigT on March 02, 2014, 01:36:28 AM
Not easy to tell from that still. Can you post the link


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Title: Re: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: euwan on March 02, 2014, 02:01:43 AM
It should be a video but either way will post again thank you FY-41AP OSD Problems (http://www.youtube.com/watch?v=8tgcvvgUI-c#)

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Title: Re: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: BigT on March 02, 2014, 03:39:56 PM
Do you only get that when you are in the house?  It looks like serious WiFi interference.  I had a problem in my workshop and found it was my wifi router booster.  My problem was not like that at all. Mine is like this
http://youtu.be/5z8fG1jLF4Y (http://youtu.be/5z8fG1jLF4Y)
Title: Re: Re: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: euwan on March 02, 2014, 03:43:05 PM
Quote from: BigT on March 02, 2014, 03:39:56 PM
Do you only get that when you are in the house?  It looks like serious WiFi interference.  I had a problem in my workshop and found it was my wifi router booster.  My problem was not like that at all. Mine is like this
http://youtu.be/5z8fG1jLF4Y (http://youtu.be/5z8fG1jLF4Y)

Not only in the house but while flying also. I have now fixed the problem by soldering a 100ohm resistor to the cam vid and ground line

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Title: Re: FY-41AP strange visual interference pattern. Advice needed from FY-41 users
Post by: Coyote on March 05, 2014, 08:52:18 PM
The curling of the corners or the screen normally indicate a video level mismatch so a 75 - 100 ohm resistor will fix that as you found out