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Packet Error Rate is increasing

JAE YOUNG LEE
Prodigy 50 points
Other Parts Discussed in Thread: CC2541

Hello, I am Jaeyoung LEE

We are testing radio with CC2541.

To test it we are using "2541EM&SmartRF05 Evaluation Board Rev.1.8.1" kit.

We configured RF core as 0dBm txpower, 2.390GHz, 1Mbps/250kHz modulation, High Gain for LNA. This configuration from "swrc251b" except modulation(Originally, 250kbps, 160kHz).

Radio communication is no problem within (-42 ~ around -70dBm), but the others(Around -71 ~ 102dBm) has problem.

The PER result was 0.1~0.2% within (-42~-70dBm) and 10~60% within more than (-70dBm).

To compare with TI provided program(per_test.hex).

We downloaded it and tested with same frequency(2.390GHz), same modulation(1Mbps,250kHz). Than TI program shows good result(PER:0.3%) even within more than (-70dBm).

Could you advise us to check what we have missed??

  • 0
    TI__Mastermind 27145 points

    Hi,

    You can use SmartRFStudio to generate the Register settings for 1MBPS/250KHz, High gain mode.

    Just open SmartRFStudio, double click on CC2541, select Proprietory mode (in pop-up window). Then it opens up one window called "Device Control Panel).

    Select the Expert mode, check Register View and RF parameters.

    First click on the required Packet Tx or Packect Rx tabs. Then,

    Under RF Parameters, select the desired frequecy (2390MHz), select the Modulation Format & Data rate to "GFSK, 250KHz Dev, 1MBPS data rate" in Packet Rx mode ( Packet Rx mode can be selected by using Tabs under RF parameters).

    This will set all the Register properly for "GFSK, 250KHz Dev, 1MBPS data rate"

    You can use "Register Export" button (under Register view) to export the Registers in different fromats.

    You can use thees Reg settings are test it again.

    It is better to select the standard configurations, which has higher data rate than the required data rate to get the proper Resgister settings in SmartRFStudio.

    Thanks,

    PM