We are developing a product that will hopefully soon be sold internationally and will therefore be put through FCC & CE Certification testing. Part of that design is an audio mixer with an integrated Bluetooth receiver. This receiver sits inside a large metal chassis so to increase the Bluetooth link strength a module was chosen which requires an external antenna (BTM625, based on CSRA64215 IC), which in our current design is attached through the chassis on an SMA connector.
The Bluetooth module in question already has FCC compliance, but reading through the compliance document I am concerned that we are in breach of 'Section 15.203 Antenna requirement' of the FCC rules, which essentially state that we must make efforts to prevent the end user from changing the antenna that is used with the product by implementing non-standard RF connectors or permanently attaching it. The idea is that the antenna (intentional radiator) cannot be changed for something that will invalidate the FCC certification.
I have seen many other products (including Bluetooth radios, for example the Denon DN-200BR) that use standardised connectors for antennas, so I am confused about this clause. Is there an exemption we can use which will allow us to pass compliance with a standard antenna connector? Or do we simply need to state in the manual that antennas other than the one provided is strictly prohibited?