<div dir="ltr">FWIW I'm building an updated "Roanoke" direction finder:
<a href="https://hackaday.io/project/163957-yet-another-doppler-direction-finder-w-teensy-dsp">https://hackaday.io/project/163957-yet-another-doppler-direction-finder-w-teensy-dsp</a><div><br></div><div>Martin</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 21, 2019 at 2:12 PM Alex Fraser <<a href="mailto:beatnic@comcast.net">beatnic@comcast.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>I found one article talking about pseudo Doppler. <br>
</p>
<p><a class="gmail-m_-8324776519423221325moz-txt-link-freetext" href="https://hackaday.com/2018/01/23/shmoocon-delightful-doppler-direction-finding-with-software-defined-radio/" target="_blank">https://hackaday.com/2018/01/23/shmoocon-delightful-doppler-direction-finding-with-software-defined-radio/</a></p>
<p>Following some of the links they mention the need to have fast
antenna switching due to the short bursty traffic.</p>
<p>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 <br>
</p>
<p>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 <br>
</p>
<p>they didn't want to tell you too much. <br>
</p>
<div class="gmail-m_-8324776519423221325moz-cite-prefix">On 3/20/2019 6:06 PM, Jacek Radzikowski
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div class="gmail_default" style="font-family:tahoma,sans-serif">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. <br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif">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.</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif">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: <a href="https://www.youtube.com/channel/UCHqwzhcFOsoFFh33Uy8rAgQ" target="_blank">https://www.youtube.com/channel/UCHqwzhcFOsoFFh33Uy8rAgQ</a></div>
<div class="gmail_default" style="font-family:tahoma,sans-serif"><br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif">Regards,<br>
</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif">Jacek</div>
<div class="gmail_default" style="font-family:tahoma,sans-serif">kw4ep<br>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Mar 20, 2019 at 5:18
PM Martin <<a href="mailto:dcmk1mr2@gmail.com" target="_blank">dcmk1mr2@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>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.</div>
<div><br>
</div>
<div>BTW <a href="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" target="_blank">Transmitter
Hunting</a> is highly recommended but is mostly VHF. </div>
<div><br>
</div>
<div>73 Martin W6MRR</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Mar 20, 2019 at
1:55 PM Alex Fraser <<a href="mailto:beatnic@comcast.net" target="_blank">beatnic@comcast.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Is it possible to find a WIFI station with direction
finding?<br>
</p>
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