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CCS/LAUNCHXL-CC1310: LOW RSSI after joining in sensor/collector example

Part Number: LAUNCHXL-CC1310

Tool/software: Code Composer Studio

Hello,

I have been using the sensor/collector example as a baseline for a project I am developing. While developing i noticed a drop in RSSI performance after network join. I see the same drop using just the examples. Using a spectrum analyzer while the sensors are trying to join a network I see average of -40 to -55 sitting in the same room, as soon as they connect that average rssi drops to around -90 to -100, obviously this is pretty terrible connection. I am just wondering is the channel that the sensor getting assigned to the cause of such a week connection? Has anyone else seen this? Also I tested these on custom boards and on launchpads saw nearly identical behavior. FYI i am using SDK 1.50 I was never able to get FH to work very well on 1.60.

Regards,

Jake

  • Jake,

    That does not sound right, do you have a spectrum analyzer that you can use to confirm the transmit power of the sensor node before and after it has joined the network. The network does not perform any kind of RSSI based reduction of transmit power. The TX power is fixed at the value that you specify during the compilation of the project.

    Regards,
    /TA
  • The only spectrum analyzer I have is a very cheap hand held one so it has pretty limited capabilities. It is still able to see the sensors scaning the channels before joining and the rssi seems expected, its just every transmission after that is pretty weak. I am 14 dB transmit power and i have CCFG_FORCE_VDDR_HH set to 1. I only see this in FH if, i disable FH i get expected performance. If i use smart RF studio I get solid transmission power as well.
  • Hello,

    Can you provide us more information on this? We did a quick test in our lab and did not see the same behavior.

    What is your sensor/collector config.h?
    Are you doing a wired or wireless test?

    Regards,
    AB