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Original question:

LAUNCHXL-CC1310: How to set TX power in CC1310

LAUNCHXL-CC1310: Sub-1 GHz forum

Jason Carnahan
Prodigy 80 points
Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

I am using a design based on the CC1310 platform.  I am using a power amplifier to extend my range.  When trying to communicate at close range I need to lower the transmit power (txpower) setting so that the receiver does not get over powered.  What are the lowest power settings that are possible with the CC1310?  RF Studio shows a -10dBm as the lowest setting.  Is there a way to adjust txpower or other settings to go lower, possibly -20dBm or -30dBm?  I have read swra542 that suggests adding a pi attenuator, but that will impact the maximum transmit power.  Please advise on all possible software settings that may allow lower transmit power with the CC1310.

  • 0
    TI__Expert 5010 points

    Hi Jason,

    The lowest characterized output power is -10 dBm for the CC1310.

    What is the output power of the power amplifier?

    Is the receiver also a CC1310 device?

  • 0 in reply to Diego P
    Prodigy 80 points

    The output power of the amplifier is 35dBm.  The receiver is the same type of device (CC1310 based).  I am porting over from the CC430 platform.  On that system I was able to lower output power at close range down to -60dBm so the devices could communicate next to each other.  Are there any registers or settings that I can modify to bring down the output power below -10dBm?

  • 0 in reply to Jason Carnahan
    Mastermind 6590 points

    The front end of CC430 has some restrictions when it comes to saturation. For CC1310 you can receive without any issues a signal up to +10 dBm. Have you checked how strong the received signal actually is in your worst case placement if you use -10 dBm on CC1310?

  • 0 in reply to TheGhostOf
    Prodigy 80 points

    I have not tested my fully assembled device yet, I am in the process of porting over the code and found the issue with setting transmit power.  I should have the system working shortly and will test.  Maybe it won't be an issue as it was on the CC430.