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nrf52832 how to increase duty cycle to 98%

Hi Team,
Currently we are working with nrf52832 in one of our project and now we are going through FCC for the same. I am using radio tool code(SDK 15.3) to generate the FCC images for different channels. I am able to generate waveforms when i am using radio_modulated_tx_carrier() function. But in the testing we have observed that, with these we are able to achieve only 25% duty cycle. To increase the duty cycle, i have used radio_modulated_tx_carrier_duty_cycle() function, but after introducing this function i am not seeing wave forms in the spectrum. following is the code snippet

while (true){
uint8_t txpower_ = RADIO_TXPOWER_TXPOWER_Pos4dBm;
uint8_t mode_ = RADIO_MODE_MODE_Ble_1Mbit;
uint8_t channel_start_ = 40;
uint8_t duty_cycle = 98;

radio_modulated_tx_carrier_duty_cycle(txpower_,
mode_,
channel_start_,
duty_cycle);
}

Kindly let us know how to increase the duty cycle to 98%.

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