AC87U and. Bluetooth HeadPhone Interference

[wsarahan]

Hi guys how are you?

My new 87u is interefing with my Phillips bluetooth headphone, the sound pops a lot

With my old 68U i never had this issue, anything that i can do to fix it?

Thanks


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[RMerlin]

Hi guys how are you?

My new 87u is interefing with my Phillips bluetooth headphone, the sound pops a lot

With my old 68U i never had this issue, anything that i can do to fix it?

Thanks


Sent from my iPad using Tapatalk HD

Bluetooth uses the 2.4 GHz band. Try using a different channel on the 2.4 GHz band.

 

[Ronv42]

Hi guys how are you?

My new 87u is interefing with my Phillips bluetooth headphone, the sound pops a lot

With my old 68U i never had this issue, anything that i can do to fix it?

Thanks


Sent from my iPad using Tapatalk HD

Is there a option in the 2.4 radio setting that sets Bluetooth coexistence? I know in Tomato their driver supports it and I used to use it so because my mouse and keyboard were Bluetooth and I would have issues with them keeping connections.

 

[wsarahan]

Is there a option in the 2.4 radio setting that sets Bluetooth coexistence? I know in Tomato their driver supports it and I used to use it so because my mouse and keyboard were Bluetooth and I would have issues with them keeping connections.

I don't think so

Merlin, is there this option in your FW? Or at the professional tab?

I'm not in front of the router right now

Tks

 

[RMerlin]

I don't think so

Merlin, is there this option in your FW? Or at the professional tab?

I'm not in front of the router right now

Tks

Not that I know.

 

[wsarahan]

Bluetooth uses the 2.4 GHz band. Try using a different channel on the 2.4 GHz band.

Change the channel to only 40mghz will make some difference?

Thanks


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[dfran1]

Here is some info I dug up

Bluetooth spectrum use

Bluetooth defines 79 channels for communication on the 2.4 GHz band each channel being separated by 1 MHz. The frequency range used is between 2.402 GHz and 2.480 GHz. Bluetooth's transmitted signal is spread across this 2.4 GHz band and the specification allows for 1600 frequency hops per second, the advantage being that since information is spread across a wide band of frequencies signals transmitted by other systems using a portion of the same frequency spectrum may appear as noise to only some of the frequencies used by Bluetooth device using frequency hopping and similarly only a portion of a Bluetooth transmission may interfere with signals transmitted by other systems.

802.11 and BT spectrum map

Center of frequency / freq-range (MHZ)
802.11 Channel number
BT Channel
2412 2402-2422
1
1-20
2417 2407-2427
2
5-25
2422 2412-2432
3
10-30
2427 2417-2437
4
15-35
2432 2422-2442
5
20-40
2437 2427-2447
6
25-45
2442 2432-2452
7
30-50
2447 2437-2457
8
35-55
2452 2442-2462
9
40-60
2457 2447-2467
10
45-65
2462 2452-2472
11
50-70
2467 2457-2477
12
55-75
2472 2462-2482
13
Not used
2484 2474-2492
14
Not used
Interference

Each 802.11 channel then equals to 20 Bluetooth channels. When communication is enabled on an Bluetooth device you will get interference when the Bluetooth device hops on to any of the 20 Bluetooth channels equivalent to your 802.11 channel. Even if a Bluetooth device hops at the max allowed frequency rate of 1600 frequency hops per second there are only 79 channels available so at this rate each channel will be used around 20 times in a second.

from here

and more info

more info

hp info on it

finally the google search I used

Please let us know what you find out.

Edit: It seems, if I am reading what I posted above correctly, wifi channels 13 and 14 do not have bluetooth on them.

 

[RMerlin]

Change the channel to only 40mghz will make some difference?

That's not the channel, that's the channel width. 40 MHz will double your chance of encountering interference since you'd be using twice as many channels on your router.

 

[ryzhov_al]

My Beyerdynamic Rsx700 is clicking once per second while 2,4GHz is on. There is nothing we can with this interference.

 

[wsarahan]

My Beyerdynamic Rsx700 is clicking once per second while 2,4GHz is on. There is nothing we can with this interference.

Are you using the 87U as well?

It was not happening with the 68U

 

[wsarahan]

Here is some info I dug up



from here

and more info

more info

hp info on it

finally the google search I used

Please let us know what you find out.

Edit: It seems, if I am reading what I posted above correctly, wifi channels 13 and 14 do not have bluetooth on them.

But we can select untill channel 11 at the router

 

[ryzhov_al]

Are you using the 87U as well?

It was not happening with the 68U

No, I'm on RT-N66U and was on RT-N16 before. Both routers causes interferences while 2,4GHz band is online.

 

[RMerlin]

No, I'm on RT-N66U and was on RT-N16 before. Both routers causes interferences while 2,4GHz band is online.

Try poking around with the "wl" userspace tool, maybe there's a setting that could be manually enabled for BT coexistence.

 

[dfran1]

But we can select untill channel 11 at the router

I only thought of that after you posted this. Hopefully you got something out of all that, it does suck that both use same channels.

I wonder if any device can use those channels 12-14?