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Why CC85XX-CC2590EM can't be closed?

Other Parts Discussed in Thread: CC2590

Hi,

Pairing (connection) disconnected when Master and Slave boards placed closely about 3cm as attached picture. I found this issue on custom board and reproduced on CC85XXDK. This issue can't be found on CC85XXEM (without CC2590) and if I reduce Target TX/RX power to -10dB on PPW also.

Please refer to below test environment and let me know why this issue can be happened.

Project: Preloaded Demo

RF Module: CC85XX-CC2590EM RF Evaluation Modules using pattern antenna.

Thanks,

Shaka