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CC2640: PTM Commands - adjusting Transmit Test Power

Part Number: CC2640

Hello,

Trying to do some wireless testing on a board with CC2640. I have successfully executed HCI_LE_Transmitter_Test and confirmed success response and current draw indicating transmission. However, I have not been able to adjust Tx Power to 2dbm. 

Attempted command: 0xFC010109 (HCI Extension Set Tx Power, 2dbm) but module no longer responsive after that command. I've had to exit and re-enter PTM in order to execute Transmitter_Test. I also attempted changing Max Power (HCI Extension Set Max DTM Tx Power, 0xFC110109) with no success. (No UART response, and no subsequent response to Transmitter_Test commands).

Am I executing the commands for Tx power incorrectly? Or is there a specific order of operations that I am missing?

Thank you,

GS