Transmit Power in Beacon Mode

IoT Modules WiFi and Bluetooth Modules
1

How is the transmit power for ble advertising in the Beacon mode set ?

  1. Is it set with the Command TX_POWER ?
  2. Is it set in the BEACON_DATA TX_power Setting

Thanks

2

Hi @rolf,

Which device do you use? And what firmware is it running?

Thanks,

3

Hi

I use the BC 127. The Firmware is 7.3

Rolf

~WRD0000.jpg

4

Hi @rolf

According to Melody Audio 7.x User Guide (https://source.sierrawireless.com/resources/airprime/hardware_specs_user_guides/bc127-melody-audio-7-user-guide/), the transmit power for BLE advertising in the Beacon mode will be set under BEACON_DATA.
You can refer to above document (Melody Audio 7.x User Guide, page 165) to set tx power for BECON mode.

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image738×448 48.8 KB

Thanks

5

Hi jerdung

Thanks for your help, but we cannot see a difference in the measured RSSI nearby. We measure the RSSI with a tablet and one ble scan app.

Our module has an onchip antenna and is placed in the housing off a tetra radio set. We need the measurement “tetra and BT Transmitter on”

for FCC acceptance test.

Do you have another idea, to switch the transmitter continuesly with defined TX power on, on one channel.

Thanks for your help

Rolf

~WRD0000.jpg

6

Hi @rolf,

I used BEACON_DATA command as above to set Tx Power for device in Beacon mode, then the Raw data which I captured is suitable with sent command. You can refer to below pictures:

  1. Set tx power with -18dBm (EE)
    SET BEACON_DATA=0 00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF 04 D2 16 2E EE
    OKSET BLE_CONFIG=1 OFF 80 OFF
    OKWRITE
    OKRESET

    image
    image1773×1205 300 KB

  2. Set tx power with -2dBm(FE)
    SET BEACON_DATA=0 00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF 04 D2 16 2E FE
    OKSET BLE_CONFIG=1 OFF 80 OFF
    OKWRITE
    OKRESET

    image
    image1509×985 191 KB

However, unfortunately that I don’t have the specific device which can measure the RSSI. So, I cannot go further on this.

About your FCC acceptance test, I found that on document AirPrime - BC127 - Product Technical Specification - Rev4.0.pdf (link: https://source.sierrawireless.com/-/media/support_downloads/airprime/hardware_specs_user_guides/airprime---bc127---product-technical-specification---rev4,-d-,0.ashx ) page 43, this BC127 device already get some FCC compliance. Hope it will be useful for you.

If you are looking forward more detail information, you may need to contact to your distributor.

Thanks,