WL1835MOD: FCC Certification failing in harmonics

Hi,

I had to make a new FCC certification for WL1835MOD because of the change in layout and since I required modular certification, I made a board which can plug into the WL18XXCOM82SDMMC very similar to the board from TI but with my RF layout/

The FCC compliance went through without much problems (4dB margin from FCC limits on channel 1 , 1Mbps)

My FCC lab requested that the module should be atleast 10cm away from any baseboard and I wired the connections between the WL1835MOD and the SDMCC adaptor board through wires and started re-testing again.

This board with wiring from (Wi-Fi module board to SDMMC adaptor board )it is failing with harmonic limits (4dB higher than FCC limits on channel 1, 1Mbps), the INI and the rest of the world is the same and the only difference between the old and the new setup is the 10cm wiring from the SDMMC adaptor board to the WL1835MOD.

There is almost 8dB difference in harmonic power between these two setups.

Have you faced any issue like this before ?

Is the 10cm distance between the module and the baseboard directive from FCC to be strictly adhered to ? how does TI approached this requirement when TI certified this board with SDMMC 

Do you have any recommendation on how to proceed further ? apart from reducing the power in the INI

Can the wiring of power and signal lines be the cause for the harmonic emissions ?

Thanks,

Ganesh