Technology Blog

Wireless NICs, External USB Hubs, and Noise

Guest Blogger

As a WiFi engineer I find reaching out to the WiFi community helps when you have questions, need advice, or real world first hand experience. You can favor Aruba, Cisco, Ruckus or any other vendor product. At the end of the day. We’re all WiFi engineers. Our community as small as it is, has experts and peers a tweet away.


My issue was no different. I’m pondering the purchase of a Surface Pro 3. The Surface Pro 3 would exclusively be used for wireless tools. AirMagnet Survey, AirMagnet WiFi Analyzer, AirMagnet XT, OmniPeek, Wi-Spy and the list goes on.


All these tools have something in common a USB form factor. The Surface Pro 3 has a single USB 3.0 port. This is very restricting, since many of these application allow for multi adapter support. USB connectivity has always been a crapshoot for me. I’ve found that certain laptops / tablets while allowing USB hubs complain of issues when 1 more more USB devices are used. Of course we can deep dive this subject of power, USB 2.0 vs USB 3.0, USB drivers, etc. But I want to focus on something that is almost never talked about. USB hub induced noise. 


When using devices like USB nics you run the chance of issues involving bad drivers, bad NICs, faulty ports, etc. One thing that most people might not consider is how well an external HUB communicates with the laptop and applications.  


Kevin Franzen fellow WiFi engineer and WiFi bad ass provided me the following captures. 


What you’re seeing is a spectrum capture with AirMagnet XT and MeetaGeek Wi-Spy. What you should pay attention to is the noise floor elevation when the Cable Master USB hub is used. Both Spectrum products are reporting very similar noise floor elevations. When comparing direct connect and both USB hubs. Its clear the Cable Master USB hub is inducing noise. 


NO USB HUB - Direct Connection 





Surface Pro 3 - No USB HUB; Direct Connect; AirMagnet Spectrum XT



Surface Pro 3 - USB HUB; HooToo; AirMagnet Spectrum XT




Surface Pro 3 - USB HUB; Cable Master; AirMagnet Spectrum XT 





Surface Pro 3 - No USB HUB; Direct Connect; Wi-Spy



Surface Pro 3 - USB HUB; HooToo; Wi-Spy 





Surface Pro 3 - USB HUB; Cable Master; Wi-Spy 






Test your USB hubs my friends.


Great writeup. My Surface Pro 3 came in the other day. I plan to write a few blogs on the WLAN design and troubleshooting uses over the next month or so. Overall I love it.

Super Contributor II

Thank you for a nice post. I´m running Ekahau site survey on my Surface Pro 3 with a USB hub that connects three Ekahau NICs. I´ll test my hub as soon as I get the chance =)


Anyone else running Ekahau on the SP3?

Occasional Contributor I

Great write up

Occasional Contributor II

We are also evaluating Surface 3 for use with Ekahau. What min. specs for the Surface 3 Pro are recomended based on your experience?



Guest Blogger

Im SP3 is used only for wifi tools, nothing else. I went on the cheap side, one model up from the lowest. The lowest model is the 128 gig drive. Problem was after the OS install and assuming the tools I was going to install it left 60 gig free. So I stepped up one model. 

New Member

Hi, I have been looking for a better USB hub for supporting my devices for site surveys (2-3 proxim cards, spectrum kits etc). The hub provided in my ekahau kit is just faulty and craps out when 3-4 devices are connected. I noticed the hootoo that is referenced in this write up has been disconnected. Do you have a recommendation on an updated tool?



Search Airheads
Showing results for 
Search instead for 
Did you mean: 
Read all about it! If it’s happening now, it’s in the community.

Check out the latest blogs from your community team, the community experts and other industry sources.