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LAUNCHXL-CC1310: Not stable with 868MHz

Murat YILDIZ
Prodigy 50 points
Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Hi,

I've 2 CC1310 Launchpad boards. If I configure them to work with 915MHz then everything is ok, they work. But if I configure them for 868MHz things change and the boards seems to be not stable at all. If I lift or hold in a specific way they for a while they seem to work but then the connection is lost again. From this I understand that the antenna on PCB is optimized for 915MHz right? Is there a predefined way to convert or adapt it for 868MHz working?

Thanks in advance...

  • 0
    TI__Guru**** 317180 points
    Actually the antenna on the CC1310 LP is slightly more efficient on 868 MHz vs 915 MHz.

    - Which software are you running?
    - When you have connection, which RSSI do you see?
    - If you set the one board in RX with smartRF Studio and not turn on the TX board, which RSSI do you see? In other words, do you see higher noise floor on one frequency vs others?
  • 0 in reply to TER
    Prodigy 50 points
    - I use the collector/sensor applications for 15.4 stack, from simplelink_cc13x0_sdk_1_50_00_08 package.
    Also using the latest CCS.
    - As the example collector/sensor apps do not show RSSI I can only give you the information that I get by doing the test with SmartRF Studio. An in this case if I configure one as RX and other as TX I get the following RSSI levels for both freqencies: 868 -> -23.8, 915 -> -26.2.
    - On 868MHz I see RSSI level around -100dBm and with 915MHz I see RSSI level around -103dBm on avarage.
  • 0 in reply to Murat YILDIZ
    TI__Guru**** 317180 points
    The RSSI levels you report is normal.

    Do you use the collector/sensor examples unmodified?
  • 0 in reply to TER
    Prodigy 50 points
    Yes it is unmodified. I guess I found the problem. It seems so that my computers USB is a little bir noisy. I've also read in one thread here that the XDS110 may also create some interference and it was proposed to test with an external power supply. I'll test with an external power supply tomorrow, and also with another computer.