[Hackrf-dev] Finding the Interference with directional antenna?

[Cinaed Simson]

Install aircrack-ng and use a $18 Alfa APA-M25 2.4/5 GHz directional
patch antenna.

You may also need a variable attenuator if the source is high power and
nearby.

Check out Ebay.

Or try an indoor yagi from simplewifi.com but they cost more than a
patch antenna.

-- Cinaed



On 12/07/2016 11:59 AM, Tamer Çelik wrote:
> Hello again Scott,
> 
> After running some tests with HackRF, i can say that its not capable to
> demodulate wifi signals due its sampling rate.
> And yes, bandwidth is limited to 20MHz but issue occurs on all channels.
> I am going to reanalyze everything with usb wifi dongle using inSSIDet
> as mentioned by Garvin.
> Do you recommend any other tool for such task?
> I cant see which tool you sent on screenshot.
> Thanks!
> 
> 
> 
> On Dec 7, 2016 18:03, "Scott Davis" <scottk5ta at gmail.com
> <mailto:scottk5ta at gmail.com>> wrote:
> 
>     The HackRF is limited to a 20-MHz bandwidth, which is the
>     approximate width of a single wi-fi channel.  The wi-fi radio in
>     your computer might be a better sniffing tool, with some type of
>     scanning/analysis software that can show the entire band at once. 
>     With the HackRF, you would need to ”tune around” in frequency as
>     well as spatial orientation to get an idea of the signals in your
>     vicinity.
> 
>     -Scott
> 
>     Example:
> 
>     https://www.amazon.com/photos/share/hDY7ElO2wAnlVQQ0pesLH70qvAf4xviDvpI2SFtLfpv
>     <https://www.amazon.com/photos/share/hDY7ElO2wAnlVQQ0pesLH70qvAf4xviDvpI2SFtLfpv>
> 
> 
>>     On Dec 7, 2016, at 5:51 AM, Tamer Çelik <tamercelik at gmail.com
>>     <mailto:tamercelik at gmail.com>> wrote:
>>
>>     Hello everyone,
>>     Thanks for all the tips.
>>     I was thinking getting this antenna:
>>     https://www.amazon.com/Super-Power-Supply-Directional-Wireless/dp/B016APUGB6/ref=sr_1_8?s=pc&ie=UTF8&qid=1481113798&sr=1-8&keywords=wifi+directional
>>     <https://www.amazon.com/Super-Power-Supply-Directional-Wireless/dp/B016APUGB6/ref=sr_1_8?s=pc&ie=UTF8&qid=1481113798&sr=1-8&keywords=wifi+directional>
>>     It's compact and perfect for 2.4 GHz band. Just need to get an
>>     RP-SMA to SMA converter adapter to use it with HackRF.
>>
>>     But i am still not sure where to look for interference.
>>     Which software i should use and what should i look for?
>>     I was thinking running SDRsharp with RX gain settings adjusted
>>     (low gain settings to pick any signal from 2.4GHz device when i
>>     physically close to it)
>>     I have decided to use HackRF after i came across a wifi analyzer
>>     device called Chanalyzer http://www.metageek.com/products/wi-spy/
>>     <http://www.metageek.com/products/wi-spy/> They provide a fancy
>>     software to determine possible intereference source and they are
>>     quite expensive, around $2000.
>>     But i think i won't need any fancy software or look out for any
>>     specific waveform determine this interference, right?
>>     Again, i have no idea what should i look for. (Noise? Waveform?)
>>
>>     Any ideas would be great.
>>     Thanks!
>>
>>
>>     On Wed, Dec 7, 2016 at 8:21 AM, Scott Davis <scottk5ta at gmail.com
>>     <mailto:scottk5ta at gmail.com>> wrote:
>>
>>         There are many, many commercial directional antennas available
>>         for the 2.4 GHz band.  Dish Network operates in the Ku-band,
>>         around 12 GHz, so their dishes are a bit small for 2.4, but it
>>         sounds like fun to play with one…it’s a lot easier to use a
>>         smaller, lightweight yagi.  They come in all sizes.  Here’s
>>         one example:
>>
>>         https://www.amazon.com/gp/product/B008Z4I7WQ/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
>>         <https://www.amazon.com/gp/product/B008Z4I7WQ/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1>
>>
>>         -Scott
>>
>>
>>>         On Dec 6, 2016, at 8:41 PM, Chuck McManis
>>>         <chuck.mcmanis at gmail.com <mailto:chuck.mcmanis at gmail.com>> wrote:
>>>
>>>         In the US there is a company called Dish Network (satellite
>>>         TV) they
>>>         use a small dish antenna to talk to the satellites, it also
>>>         makes a
>>>         great starting point for a directional WiFi antenna. Remove
>>>         the LNB
>>>         that is normally in the antenna and tape a WiFi chip antenna
>>>         at the
>>>         focal point. You can then point quite accurately at various WiFi
>>>         sources.
>>>
>>>         <http://tse1.mm.bing.net/th?&id=OIP.M2844c9d84173dc5d1b923fed7c9edf64o0&w=300&h=300&c=0&pid=1.9&rs=0&p=0&r=0
>>>         <http://tse1.mm.bing.net/th?&id=OIP.M2844c9d84173dc5d1b923fed7c9edf64o0&w=300&h=300&c=0&pid=1.9&rs=0&p=0&r=0>>
>>>         is a picture of one of these antennas.
>>>
>>>         --Chuck
>>>
>>>         On Tue, Dec 6, 2016 at 5:20 PM, Tamer Çelik
>>>         <tamercelik at gmail.com <mailto:tamercelik at gmail.com>> wrote:
>>>>         Hello,
>>>>         I am having a strange interference issue on my 2.4GHz WiFi
>>>>         network while
>>>>         5GHz band works perfect.
>>>>         This might be coming from one of my neighbours.
>>>>         Just wanted to ask if its possible to use a "directional"
>>>>         antenna with
>>>>         HackRF and explore the area for possible source of interference?
>>>>         I am pretty sure on that something jamming 2.4GHz for random
>>>>         intervals.
>>>>         Any suggestions?
>>>>         Thanks!
>>>>
>>>>         _______________________________________________
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>>>>         <https://pairlist9.pair.net/mailman/listinfo/hackrf-dev>
>>>>
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>>
>>
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>>
> 
> 
> 
> 
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