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Tx Power BLEMesh

Ilich Guerrero
Intellectual 555 points

Other Parts Discussed in Thread: LAUNCHXL-CC1352P, SYSCONFIG, CC1352P

Dear TI support.
We are testing the LAUNCHXL-CC1352P with the example “simple_mesh_node_CC13X2P_2_LAUNCHXL_tirtos_ccs” from SDK “simplelink_cc13x2_26x2_sdk_4_40_04_04”.
We could send messages between two LAUNCHXL-CC1352P.
In order, to increase the coverage distance, we tried to change the tx power. When we set “Default Tx Power = 20” in Sysconfig, but the coverage distance did not change (remains 10 meters). Then, we used the function “HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_P2_20_DBM)” and now the range is increased, but too few (only 40 meters).
By the way, we achieved almost 110 meters with the example “rfEasyLinkEchoRx_CC1352P_2_LAUNCHXL_nortos_ccs” (we run the example without modification).
We are wondering if everting is ok or maybe we are missing something in order to increase the coverage distance. Please, help us if we are doing the right to adjust the tx power.

We are using Code Composer: CCS10.2.0.00009_win64

Thanks in advance.

  • 0
    TI__Guru** 101490 points

    Hi,

    First of all you are not doing a "apple to apple" comparison when comparing the EasyLink examples to the Mesh example. These examples are using different PHYs and different ways to schedule the radio operations.

    In addition, the CC1352P launchpad uses a PCB antenna optimized for Sub-1GHz operations. If you wish to improve the range of the RF communication, I would suggest you to use an external antenna. To do so, you should find a 2.4GHz SMA antenna and mount it on the SMA connector of the launchpad - : you will be required to flip one of the capacitor of the Launchpad to use an external antenna. If it helps, I usually use the "Titanis 2.4 GHz Swivel SMA Antenna" but many other antennas would fit your needs (see here, here and here)

    Best regards,

  • 0 in reply to Clément
    Intellectual 555 points

    Hi Clément,

    Thanks for your answer, it helps so much. Let me try to use an external antenna at 2.4 GHz.

    According with the schematic (LAUNCHXL-CC1352P-2_SCHEMATIC.pdf) do you have the ideal value for C483?

    Best regards

  • +1 in reply to Ilich Guerrero
    TI__Guru** 101490 points

    Hi,

    I cannot comment on the ideal value. However, I can tell you I am basically flipping the capacitor C482 (i.e. I use a 47 pF capacitor)

    Regards,