Digivolution
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Joined: Wed Mar 07, 2018 9:56 pm

Increase Pi USB Bluetooth RX power.

Mon Oct 08, 2018 10:47 pm

I am working on a robot project. I disabled the Pi3b+ onboard bluetooth in favor of a Trendnet TBW-106UB , class 1 USB dongle. It works great and connected to the PS3 controller to control the robot with no issues.

I am curious, is there is a way to increase the RX, receive, power to add additional range?

Currently, this is what I see.

hci0: Type: Primary Bus: USB
BD Address: 00:15:83:F3:61:C8 ACL MTU: 310:10 SCO MTU: 64:8
Inquiry transmit power level: 4

Thanks in advance,
D.

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Douglas6
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Location: Chicago, IL

Re: Increase Pi USB Bluetooth RX power.

Mon Oct 08, 2018 11:54 pm

My gut feeling is to say no. I know that's not helpful with no backup documentation. I just think that, if there were a simple software tweak to increase range, the manufacturer would have already tweaked it.

Digivolution
Posts: 16
Joined: Wed Mar 07, 2018 9:56 pm

Re: Increase Pi USB Bluetooth RX power.

Tue Oct 09, 2018 9:43 pm

I was hoping. I saw there were commands to adjust TX power:
To set Max tx power:
sudo bccmd psset -s 0x0000 0x0017 -16
To set default tx power:
sudo bccmd psset -s 0x0000 0x002d -16

USB specs:
https://www.trendnet.com/products/prodd ... solution02


So I thought I'd ask.

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Douglas6
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Location: Chicago, IL

Re: Increase Pi USB Bluetooth RX power.

Wed Oct 10, 2018 12:35 am

Bccmd seems to be specific to CSR chipsets, and I am far from proficient with the command sets of particular manufacturers. So, again, I don't know.

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thagrol
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Re: Increase Pi USB Bluetooth RX power.

Wed Oct 10, 2018 12:36 pm

This might be an overly simple understanding but wouldn't recieve range be limited by the antenna design and the power of the remote transmitting device?

I guess you might need to boost local tx power to mkae sure the remote device can see your outgoing transmissions.
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If you believe "L'enfer, c'est les autres" (Hell is other people) have you considered that it may be of your own making?

Digivolution
Posts: 16
Joined: Wed Mar 07, 2018 9:56 pm

Re: Increase Pi USB Bluetooth RX power.

Fri Oct 12, 2018 4:41 am

thagrol wrote:
Wed Oct 10, 2018 12:36 pm
This might be an overly simple understanding but wouldn't recieve range be limited by the antenna design and the power of the remote transmitting device?

I guess you might need to boost local tx power to mkae sure the remote device can see your outgoing transmissions.
I increased the TX power. It seemed to help. I have connectivity at about 60 feet now. Thank you for the suggestion.
The USB dongle also seems very 'directional' in it's signal strength.

D.

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