Summary

• Problem:

  • Video System is seeing a lot of noise induced when ESCs are under load

• Options (not mutually exclusive)

  • Use a thicker wire to ensure low inductance and resistance to this device.

  • Add a common mode choke or inductor (and appropriate capacitors to avoid a resonance problem)

    • essentially add an input filter close to the OSD

  • Add more input capacitance

    • OSD board has very few input caps

  • Use a power supply placed further away from the ESCS

    • reduce noise coupling into the system

  • Move VTX system

    • If it’s on other side of drone away from ESCs that should help as well

• Target next steps before saturday the 11th

  • Determine theoretical peak current into the video system

    • see arch doc for hardware datasheets

  • Ensure wires are appropriately sized, fix if not.

  • Solder more capacitors into the harness connection (cover in conformal coat)

  • test this at flight test to see if this solves. Then we can proceed to other options. Start simple.

• Target steps before Saturday the 18th

  • wait to see if stuff before solves

  • add in common mode choke, design to ensure won’t saturate

  • verify capacitance is sufficient

• @Ishman Mann driving this with support from @Daniel Puratich

• Ishman got busy, @Daniel Puratich added caps to osd and video mux and evaluated vtx input filter

• tested at flight test and worked perfectly.

Technical Details/Changelog

12V must be supplied to the VTX system off of a unique BEC, not using the PDB.

Open

Open

@Nathan Green to provide more context on why this is necessary. ← video looked poor when escs at high throttle.

EE to (hopefully) provide more context/clarity on 2024-04-22 RF Electronics ← not gonna happen, see the physical drone, unfortunately team pre busy rn

Arch doc implementation Info

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Approvals & Reviews

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