LAUNCHXL-CC1310: TI 15.4 stack PHY ID 133 (868MHz) weak signal strength

Hi,

I have tried to form a TI 15.4 stack PHY ID 132 (915MHz) network using multiple TI LaunchPad-C1310, it works great.

Then I changed the PHY ID from 132 to 133 (868MHz), the sensor node can’t join the network. I tried to analyze the network using TI SmartRF Packet Sniffer 2, no Beacon Request from the sensor node is detected.

However, whenever I touched the TI LaunchPad-CC1310’s antenna with my hand, Beacon Request is detected and it can join the network, just the signal is weak even just a few meters away from the coordinator.

Could someone tell why this happens? Or anything I configured wrongly?

Setup Details:

TI CC1310 LaunchPad: Rev 1.4, with CC1310 Rev 2.1

SDK: Simplelink CC13x0 4.10.02.04 – TI 15.4 stack 

Non-Beacon Mode

/*! Setting for Phy ID */

#define CONFIG_PHY_ID               (APIMAC_GENERIC_ETSI_863_PHY_133)

#define CONFIG_CHANNEL_MASK           { 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, \

                                                                        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \

                                                                        0x00, 0x00, 0x00, 0x00, 0x00 }

Best regards,

CP