BT Continuous TX Output Power Test 8997

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BT Continuous TX Output Power Test 8997

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eoin_oconnell
Contributor I

Hi all, My HW setup is an imx7 with a custom carrier board where the wifi module(AW-CM276NF) is present, this module has the Marvell 8997 BT/Wifi module.

I am currently using some test scripts to activate a continuous TX mode of the module.https://github.com/hychiang73/wlan_script/blob/master/bt_ctx.sh

I measure the output power conducted at the module's output connector and I only see around -20dBm. I am measuring the power in a 10MHz bandwidth, peak is around -30dBm but integrated across the bandwidth I get a total power of around -20dBm

How can I change the output power or put it in such a mode that I get the maximum output of around 4dBm for Bluetooth, I am measuring at the AUX antenna port..

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3 Replies

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weidong_sun
NXP TechSupport
NXP TechSupport

Hi,

The following commands are for you refrence:

1. hcitool -i hci0 cmd 3f 00ee 01 0N --> N is BT max TX power, (Pls try out different values)

2. hcitool -i hci0 cmd 03 0003 --> HCI reset is to make the change on max Tx power take effect.

3. hcitool -i hci0 cmd 03 001a 03 --> Enable Page Scan and Inquiry Scan

4. hcitool -i hci0 cmd 06 0003 (BT Test mode)

5. Run CBT (Link mode) and check the BT TX output power.

 

Have a great day!

B.R,

weidong

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281 Views
eoin_oconnell
Contributor I

Thanks for the detailed reply, but you left out the vital last step.

 

What do you mean by run CBT (Link Mode) ?

I tried your 4 steps and no output on the spectrum analyser

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weidong_sun
NXP TechSupport
NXP TechSupport

Dear eoin_oconnell ,

CBT , here means CBT Bluetooth Tester. for exmaple, CMW270/CMW500.

when bluetooth enters TEST Mode, you can use it to connect with bluetooth.

spectrum analyser can't be used to measure Power.

 

Have a nice day!

B.R,

weidong

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