WIFI DFing

[Martin]

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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>
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