What signal is being mixed with the carrier frequency when you call HCI_EXT_ModemTestTxCmd(HCI_EXT_TX_MODULATED_CARRIER,0); ?
I assume setting HCI_EXT_TX_UNMODULATED_CARRIER causes the radio to continuously broadcast the carrier frequency with no modulation (all 1's transmitted), and HCI_EXT_TX_MODULATED_CARRIER causes some pattern of 1's and 0's to be sent out. Is my understanding flawed? If not, what is that pattern of 1's and 0's?