WIFI DFing

[Alex Fraser]

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 
> <mailto: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
>     <mailto:beatnic at comcast.net>> wrote:
>
>         Is it possible to find a WIFI station with direction finding?
>
>         -- 
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