WIFI DFing

[Jacek Radzikowski]

Balint Seeber gave great presentation on direction finding:
https://www.youtube.com/watch?v=NSC4Y8yA-jY
And here is his page with links to additional resources:
https://wiki.spench.net/wiki/SDRDF

Jacek
kw4ep


On Thu, Mar 21, 2019 at 7:55 PM Martin <dcmk1mr2 at gmail.com> wrote:

> FWIW I'm building an updated "Roanoke" direction finder:
> https://hackaday.io/project/163957-yet-another-doppler-direction-finder-w-teensy-dsp
>
> Martin
>
> On Thu, Mar 21, 2019 at 2:12 PM Alex Fraser <beatnic at comcast.net> wrote:
>
>> I found one article talking about pseudo Doppler.
>>
>>
>> https://hackaday.com/2018/01/23/shmoocon-delightful-doppler-direction-finding-with-software-defined-radio/
>>
>> Following some of the links they mention the need to have fast antenna
>> switching due to the short bursty traffic.
>>
>> Their special board to do the switching was called opera cake.  To deal
>> with the spread it looked like you had to view a waterfall display and do
>>
>> some advanced between the ears processing.  I probably won't get any
>> further than looking.  I did see some commercial rigs, but for some reason
>>
>> they didn't want to tell you too much.
>> On 3/20/2019 6:06 PM, Jacek Radzikowski wrote:
>>
>> Using regular radio for DFing a wifi transmitter is not such a good idea.
>> The channels overlap, higher data rate transmissions use spectrum spanning
>> several channels, and many stations transmit on the same frequency, so with
>> a plain received you will hear a cacophony of sounds, making it almost
>> impossible to find the station you're looking for.
>> You will get much better results using a good wifi card with SMA
>> connector (Alfa cards are great for 2.4G band) with a directional external
>> antenna and airmon-ng from Aircrack-ng package to monitor signal strength
>> for the station you are interested in.
>> Don't buy those cheap 2.4G yagis from ebay or amazon. They are junk.
>> You'll get much better results with a home-made cantenna, orheck Andrew
>> Mcneil's channel on youtube if you need some inspiration:
>> https://www.youtube.com/channel/UCHqwzhcFOsoFFh33Uy8rAgQ
>>
>> Regards,
>> Jacek
>> kw4ep
>>
>> On Wed, Mar 20, 2019 at 5:18 PM Martin <dcmk1mr2 at gmail.com> wrote:
>>
>>> WiFi features short packets.  You can tune in on an access point and
>>> hear the clicks.  You could try with a highly directional yagi or time of
>>> arrival rig.
>>>
>>> BTW Transmitter Hunting
>>> <https://www.amazon.com/Transmitter-Hunting-Direction-Finding-Simplified/dp/0830627014/ref=asc_df_0830627014/?tag=hyprod-20&linkCode=df0&hvadid=312126345020&hvpos=1o1&hvnetw=g&hvrand=18402996747497945190&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032081&hvtargid=pla-569092361693&psc=1> is
>>> highly recommended but is mostly VHF.
>>>
>>> 73 Martin W6MRR
>>>
>>>
>>> On Wed, Mar 20, 2019 at 1:55 PM Alex Fraser <beatnic at comcast.net> wrote:
>>>
>>>> Is it possible to find a WIFI station with direction finding?
>>>> --
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>>
>>
>> --
>> Given a choice between two theories, take the one which is funnier
>>
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-- 
Given a choice between two theories, take the one which is funnier
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