So after some reading, phoning, thinking, again and again about FCC/CE Certification here is the plan.
I'm not going to go for the FCC Certification, as it's way too expensive, but I'll run the test myself for CE compliance.
When FCC needs to be done by US agencies, the CE can be self-certified : you run the tests with the appropriate tools, make sure your design respects the requirements, and if so, keep the results in case anyone asks anything.
Now pretty much everywhere, I read that if your product is CE compliant, then your chance of getting the FCC on the first run is very high. Dropping the cost to a "small" $5k or so
So first, CE self certification, and then if needed/wanted/asked/ ... FCC, IT, ... other certifications. Meaning so US selling first just Europe. Are there many US folks using Mysensors ?
To run the test, I'm working with my University which has all the tools, and knowledge to assist me. Could be an interesting project to run with some student ... will see !
So regarding the design, zero risk must be taken regarding the RF part :
- the filtering components will be replaced by a Balun Filter from JOHANSON (http://www.johansontechnology.com/datasheets/baluns/Johanson nRF24L01_nRF24L01+_App_Note.pdf)
- I'll add a shielding on top of the RF part. Still looking for the right standard, low cost, easy mounting shield
I share a great guide from TI about antenna design : http://www.ti.com/lit/an/swra161b/swra161b.pdf
Now I want to try the Inverted F antenna presented in my early post, a Di pole antenna (no more Balun Filter), and Chip antenna and compare them the standard Meandered Inverted-F Antenna (MIFA) we all have on our NRF board !