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cc1310 1Mbps spectrum and channel spacing

Tommi Ylamurto
Prodigy 145 points

Hi,

Is there any spectrum measurements available that we could use as a guide line to choose the channel spacing in 1Mbps mode?

In the provided examples the base band filter is set to 0x81. This is reserved value and the comments mention bandwidth of 2.8MHz which sounds very high for this modulation.

Thanks

rfc_CMD_PROP_RADIO_DIV_SETUP_t RF_cmdPropRadioDivSetup =
{
    .commandNo                  = 0x3807,
    .status                     = 0x0000,
    .pNextOp                    = 0, /*INSERT APPLICABLE POINTER: (uint8_t*)&xxx */
    .startTime                  = 0x00000000,
    .startTrigger.triggerType   = 0x0,
    .startTrigger.bEnaCmd       = 0x0,
    .startTrigger.triggerNo     = 0x0,
    .startTrigger.pastTrig      = 0x0,
    .condition.rule             = 0x1,
    .condition.nSkip            = 0x0,
    .modulation.modType         = 0x1,
    .modulation.deviation       = 0x3E8,
    .symbolRate.preScale        = 0xC,
    .symbolRate.rateWord        = 0x80000,
    .rxBw                       = 0x81,//2.8 MHz  1 Mbps/BLE PHY need this for 868 MHz and Divider5
    .preamConf.nPreamBytes      = 0x4,
    .preamConf.preamMode        = 0x0,
    .formatConf.nSwBits         = 0x20,
    .formatConf.bBitReversal    = 0x0,
    .formatConf.bMsbFirst       = 0x1,
    .formatConf.fecMode         = 0x0,
    .formatConf.whitenMode      = 0x1,
    .config.frontEndMode        = 0x0,
    .config.biasMode            = 0x1,
    .config.bNoFsPowerUp        = 0x0,
    .txPower = 0xa73f,
    .pRegOverride               = pOverrides,
    .centerFreq                 = 0x0364,
    .intFreq                    = 0x8000,
    .loDivider                  = 0x05,
};
  • 0
    TI__Genius 9705 points
    Hello,

    This configuration programs the device in 2GFSK at 1MBPS datarate, 250KHz deviation with filter h=0.5. 99% occupied bandwidth of transmitted signal is ~1.2MHz. Due to the way it has been implemented on the device, the receive bandwidth setting provided in the example should not be changed. Channel spacing depends on your system requirements.

    Regards,