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CC1111 USB dongle Distance Improvement

sathish reddy
Prodigy 70 points

Hi All,

I am using CC1111F32 USB Dongle>
I am able to communicate 2 cc1111 usbdongles for about 20Meters LOS and 7-8 meters NONLOS.

Is it possible to improve this by 100Mtrs los and 50Mtrs  NLOS without changing the hardware and extra circutary through software(power level control) .

And also how to change the power levels of Simliciti protocol from 0dbm to 10dbm

  • 0
    TI__Guru**** 317180 points

    See http://processors.wiki.ti.com/index.php/SimpliciTI_FAQ for the Simlicity question. Which datarate and modulation format are you using and how do you measure?

    You should be able to get better range. If you are able to, check the center frequency for both dongles and the output power to ensure you don't have any fundamental limitations by accident.

  • 0 in reply to TER
    Prodigy 70 points

    Thanks TER for your reply.

    I have changed the output power to 10dbm.But still  I am not getting the distance.

    I have changed #define MRFI_SETTING_PA_TABLE0  0x8E to 

    #define MRFI_SETTING_PA_TABLE0  0xC0 in mrfi_radio.c file.

    It is not working.

    I also tried SMPL_Ioctl(IOCTL_OBJ_RADIO,IOCTL_ACT_RADIO_SETPWR,2) 

    after SMPL_Init.


    It is also not working.

    please confirm above procedure is correct or not.Also suggest How I can improve the distance.

    If possible please provide the sample code...

     

  • 0 in reply to sathish reddy
    TI__Guru**** 317180 points

    Again, could you please provide which datarate, deviation, modulation format you are using?

    Not working: What it the measured output power before and after the code change?

  • 0 in reply to TER
    Prodigy 70 points

    Hi TER ,

    Below are my RF parameters. 

    Base Freq:868.299683,Xtal Freq:48 ,Modulation:GFSK,

    Channel Number :0,DataRate:1.19877kB,Deviation:5.126953kHZ,

    ChannelSapcing:199.951172,Rx Filter BW:62.500000,

    TX.power:0db,carrier freq:868.299683.

    My antenna size: 2cm(approx) (I am using cc1111usb dongle  )

    Height of the product from surface: 2meters

    One module is indoor.and other module is at outdoor.

    please suggest RF register settings.and also how can I improve the distance 

  • 0 in reply to sathish reddy
    TI__Mastermind 18780 points

    Your settings looks ok, I assume you have used SmartRF studio to provide the settings? If not, please provide your register settings so that we can check them? What is your test environment? Does the distance increase if you have both units outside? What is the RSSI when you start to loose packets? Have you tested the  units using SmartRF Studio SW instead?