I've had video noise but this is a bit different.
  Diagonal lines during applying throttle but some when diving too.
   Here's a bit of footage and if video is paused at right time broken lines can be seen in video. 
  
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New Quad? Well used one? Just started to do this but was OK? Changed anything? What is it?

Has it had a knock? Tried swapping antenna? Wiring to and from VRX twisted and away from noise generation items?

Photos of quad inc VTX location/wiring?

First thing I was wondering about was whether it had a good low ESR cap on it. Really does look like dirty power.

I assume you are already using a low ESR cap (e.g. 1000uF) on the input power? If not add one.
And it could be dirty power source to the VTX, and also could be EMI from the ESC MOSFET.
Try powering the VTX off 9V if available? and the camera off the 5V from the FC. See if that improves it.
check out these shielding: aliexpress.com/item/1005003384905175.html

if the vtx is added to the lipo in pads, i would suggest to solder the negative wire to any ground pad on the fc, leave the plus on the lipo in. that solved many video noise issues for me

Its a new build Apex micro 4"with all new parts..
Diatone 405 mini stack,4S setup.Ghost hybrid HV vtx/rx.Rush cherry antenna.


The FC only has 5v vtx pads so I'm using Vbatt.
The Diatone F405 stack mini came with a cap and I have it on 4N1 battery pads.
Its a F405 mini mk2 stack I grabbed on Black Friday sale last year.
FC is rated for6S but not the 4n1 its up to 5S.FWIW.

The lines appear when I apply throttle but once quad stops accelerating noise stops or gets better.
I will try adding another ground wire and a micro 16v cap directly on vtx + and - pads.

As others, I think power feed to VTX is most likely.

Maybe that capacitor isn't up to much, and the first thing I'd do would be to replace it with a more robust one. I'd do this regardless of any other action, as there are capacitors and then there are capacitors!! I have had results worse than you from bad ones, instantly cured after upgraded replacement.

If that fails, and you are feeding the VTX from battery supply (as its HV) there's only the wiring to the vtx in between, so is this wiring twisted to limit induced signal? Is it short as possible, and routed away from other wiring as much as you practically can?

Then yes, smooth the VTX supply, but use a Low Noise circuit, as adding a local cap if battery fed is IMO only paralleling the two caps and marginally adding their value together.

I added another cap directly to the vtx voltage pads and will try flying a bit later today and see what happens.
If I still have noise I will tear down my build and add ground wires and a better capacitor.
It could be the vtx antenna for using a whip antenna didn’t produce noise on the bench but the new Cherry does.

(29-Oct-2022, 04:55 PM)Rob3ddd Wrote: I added another cap directly to the vtx voltage pads and will try flying a bit later today and see what happens.
  If I still have noise I will tear down my build and add ground wires and a better capacitor.
 It could be the vtx antenna for using a whip antenna didn’t produce noise on the bench but the new Cherry does.

  I added another cap on the vtx + - pads and noise got noticeably worse.
  It’s been a while since I looked at using capacitors in parallel.
  I do have a Rush TVS diode lite board and cap that I may try.

"add ground wires"
switch the ground from lipo in to any ground pad on the fc, no additional wires.

caps in paralell is no issue, maybe you use bad capacitators?

You might try a cap with a higher voltage limit. A fully charged 4S pack is 16.8V, which already exceeds the limit of a 16V capacitor. I tend to use 25V for 4S and 36V or 50V for 6S. My Micro Apex 3" build has a 36V 470µF capacitor zipped to the arm and extended a little with some leftover motor wire. It's a 4S build, so I went over spec a little bit, but the video is ultra clean. The main reason to use a lesser capacitor is size, so don't be scared of a little overkill.

Or another idea if nothing else wants to give results. Grab a cheap 9V or 12V BEC. Matek sells a 3 pack for like $11.

(29-Oct-2022, 10:05 PM)hugnosed_bat Wrote: "add ground wires"
switch the ground from lipo in to any ground pad on the fc, no additional wires.

caps in paralell is no issue, maybe you use bad capacitators?

  I’ll try a few more things this week.
 Today’s weather must be producing more noise because with or without the extra cap it’s the same amount of noise.
 Yesterday looked better but no clouds or high humidity.

I think I will try an external BEC to start with.

I must say the micro Apex 4” does fly great but I still think 3.5” freestyle quads are my favorite if kept under 250grams which is fairly easy.

ground wire switch can do such an improvement about esc noise, i would strongly suggest to start with that befor an external bec.
if you add a bec to the lipoin circuit, the noise will be the same, at least on tiny a matek bec, they doesnt filter at all. i had some noise from matek becs itself a few times.

an lc filter, a tiny one like the ones from lantian, could cleanup noise.

what brand or model of caps are you using?

did you shrink the d-term value as a try? as it is throttle related, high dterm value could bring noise

(31-Oct-2022, 08:58 AM)hugnosed_bat Wrote: ground wire switch can do such an improvement about esc noise, i would strongly suggest to start with that befor an external bec.
if you add a bec to the lipoin circuit, the noise will be the same, at least on tiny a matek bec, they doesnt filter at all. i had some noise from matek becs itself a few times.

an lc filter, a tiny one like the ones from lantian, could cleanup noise.

what brand or model of caps are you using?

did you shrink the d-term value as a try? as it is throttle related, high dterm value could bring noise

   
     I added another ground wire from vtx to ground pad next to Vid out and it made a huge improvement.
If I turn power down to 100mw it’s almost perfect.
At 350mw it’s still good but at 1000mw it gets a bit noisy during throttle bursts but it’s still an improvement with extra ground wire.
I’ll look at the values of cap when I pull my props and flash Bluejay for bidirectional.