RE: Problem to generate modulated countiuous signal

MartinBL — Fri, 23 Mar 2018 14:16:43 GMT

Hi,

You have forgotten to actually start the radio. Try changing your code to something like this:

int main(void)
{ 
    uint8_t txpower = RADIO_TXPOWER_TXPOWER_0dBm; // 0 dBm
    uint8_t mode = RADIO_MODE_MODE_Nrf_2Mbit; // 2 MBit mode
    uint8_t channel = 40; // Transmit at channel 40
    int delayms = 10;
    init();
    radio_modulated_tx_carrier(txpower, mode, channel);
    
    NRF_RADIO->TASKS_START = 1;

    while(true) 
    { 
        ;
    }
    
}

Note that you shouldn't place all your code inside your while(true) loop. That will just restart your radio over and over again, and not transmit any measurable signals.

If you have an extra nRF52 DK kit you can use nRF Connect for desktop and the RSSI Viewer plugin to visualize the spectrum. After modifying your code my RSSI Viewer showed me this: