VN7-791G: Wifi slow and unreliable when a memory stick is plugged into the right side USB ports.

cwthomson
cwthomson Member Posts: 2 New User
in 2016 Archives

Wifi becomes fast and reliable whne the memory stick is unplugged. Consistently reproducible. Does not happen when the memory stick is plugged into the left side USB ports. Has anyone else seen this behaviour?

 

Qualcom Atheros QCA61x4 wireless network adapter with driver version 12.0.0.230 dated 2016-03-21.

 

Thanks,

Chris

Best Answer

  • sharky25k
    sharky25k Member Posts: 473 Skilled Practitioner WiFi Icon
    Answer ✓

    Hi,

     

    The explanation is simple. I am sure that the memory stick is a USB 3.0 one plugged in a USB 3.0 port. The problem is that all USB 3.0 devices generate a 2.4 Ghz interference, thus it generates interference on the frequency on which the wireless works. The solution is to plug the drive in another port or to switch the wifi to 5Ghz if your router supports it. Probably the antenna of the wifi is very close to the port and thus to the USB stick.

     

    This is known from a very long time, and it has nothing to do with the notebook.

    There is an article on the intel webpage which describes the problem more technically. You can look for it if you wish.

     

    This will cause a problem also with a wireless mouse, if the receiver is plugged in next to a USB 3.0 stick or any other device.

Answers

  • philetus
    philetus ACE Posts: 4,759 Pathfinder

    Have you tried another brand of USB drive?

  • sharky25k
    sharky25k Member Posts: 473 Skilled Practitioner WiFi Icon
    Answer ✓

    Hi,

     

    The explanation is simple. I am sure that the memory stick is a USB 3.0 one plugged in a USB 3.0 port. The problem is that all USB 3.0 devices generate a 2.4 Ghz interference, thus it generates interference on the frequency on which the wireless works. The solution is to plug the drive in another port or to switch the wifi to 5Ghz if your router supports it. Probably the antenna of the wifi is very close to the port and thus to the USB stick.

     

    This is known from a very long time, and it has nothing to do with the notebook.

    There is an article on the intel webpage which describes the problem more technically. You can look for it if you wish.

     

    This will cause a problem also with a wireless mouse, if the receiver is plugged in next to a USB 3.0 stick or any other device.

  • cwthomson
    cwthomson Member Posts: 2 New User

    sharky25k is right. It does not happen with a USB 2.0 memory stick. It does not happen when connected at 5 Ghz. It only happens with a USB 3.0 memory stick in a USB 3.0 port when connected at 2.4 Ghz.

     

    Thanks,

    Chris

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