Finally I've got all systems working. The combination of the telemetry modem and GPS module gave me a lot of headaches. The solution proved to be a separate UBEC for the modem and moving that UBEC as far away from the other electronics as possible.
This plane is fully decked with:
- Downward facing gopro/mapir
- 433 telemetry
- D4R-II radio
- I2c airspeed
- I2C sonar
- A laser cut housing for all electronics that slides inside and is attached with a couple of screws.
- Half lambda dipole antenna embedded in the tail.
What do you think? Ideas for improvement? What are more bulletproof (less noisy) telemtry setups?