Hi there
The fact is that 'normal' telemetry not involving any performance enhancements are allowed. Please look up the 'ABR volume' of the sporting-code downloadable from
http://www.fai.org/aeromodelling/documents/sc4. In chapter B.11.2 you will find this text :
A Spread Spectrum technology receiver that transmits information back to the pilot-operated transmitter, is not considered to be a “device for the transmission of information from the model aircraft to the competitor”, provided that the only information that is transmitted is for the safe operation of the model aircraft.
So, as long as your new system is not expanded creatively, it is allowd in F3A
Best regards
Ola