<div dir="ltr"><div>I believe the wifi receiver approach is better but it could still be done with a radio. <br></div><div><br></div><div>I just tried a HackRF/rubber ducky/waterfall spectrum analyzer application and was able to locate my AP/extenders using body blocking technique. There's enough amplitude variation on the waterfall to fingerprint different stations on the same frequency. I didn't have time to reproduce it using the audio clicks but I think it could work as well. Body blocking works great at those frequencies so I don't think a directional antenna would be needed. I'm going try it later with my Alpha card. Maybe we can put a new spin on an old fad - AP hunting.</div><div><br></div><div>73 Martin W6MRR</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 20, 2019 at 3:36 PM Terry N4TLF <<a href="mailto:n4tlf@wb4jfi.com">n4tlf@wb4jfi.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 dir="ltr">
<div style="font-size:10pt;font-family:Arial;color:rgb(0,0,0)">
<div>It is possible to DF if you have a good directional antenna, a wifi device
that allows an external antenna, and you can program a version of DD-WRT (IIRC)
into the device. I have used both a beam and a dish to peak on specific
wifi signals. It helps to know what channel the wifi in question is on,
and even better the SSID. It’s been a while, but there is a mode in
DD-WRT, or the HSMM/BBHN/AREDN firmware that shows you the SSIDs out there on
what channels, and I think you can get signal strength, albeit slowly. Or,
use the software that Jacek mentions.</div>
<div> </div>
<div>You can also use an old satellite TV antenna, with a modified feed in place
of the original feed/LNB combo. There are a LOT of instructions on how to
modify them. Realize that these antennas use an offset feed, so don’t
“point” the antenna without taking that into account.</div>
<div> </div>
<div>I have had good luck with both the Amazon wifi beam antennas ($25?), and
the $50 parabolic dish on Amazon. Mel (W4MEL) and I were using these to
build a AREDN link between our two houses, as well as trying to get others
interested in AREDN/BBHN here in Charleston a couple of years ago.
Unfortunately, there are not enough hams or high places here to make an AREDN
network viable.</div>
<div>73, Terry, N4TLF</div>
<div style="font-size:small;text-decoration:none;font-family:Calibri;font-weight:normal;color:rgb(0,0,0);font-style:normal;display:inline">
<div style="font:10pt tahoma">
<div><font face="Arial"></font> </div>
<div style="background:rgb(245,245,245)">
<div><b>From:</b> <a title="jacek.radzikowski@gmail.com">Jacek Radzikowski</a> </div>
<div><b>Sent:</b> Wednesday, March 20, 2019 6:06 PM</div>
<div><b>To:</b> <a title="dcmk1mr2@gmail.com">Martin</a> </div>
<div><b>Cc:</b> <a title="tacos@amrad.org">tacos</a> ; <a title="beatnic@comcast.net">Alex Fraser</a> </div>
<div><b>Subject:</b> Re: WIFI DFing</div></div></div>
<div> </div></div>
<div style="font-size:small;text-decoration:none;font-family:Calibri;font-weight:normal;color:rgb(0,0,0);font-style:normal;display:inline">
<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"> </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>
<div> </div>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Wed, Mar 20, 2019 at 5:18 PM Martin
<<a>dcmk1mr2@gmail.com</a>> wrote:<br></div>
<blockquote class="gmail_quote" style="padding-left:1ex;border-left:1px solid rgb(204,204,204);margin:0px 0px 0px 0.8ex">
<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> </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> </div>
<div>73 Martin W6MRR</div>
<div> </div></div>
<div> </div>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Wed, Mar 20, 2019 at 1:55 PM Alex Fraser
<<a>beatnic@comcast.net</a>> wrote:<br></div>
<blockquote class="gmail_quote" style="padding-left:1ex;border-left:1px solid rgb(204,204,204);margin:0px 0px 0px 0.8ex">
<div bgcolor="#FFFFFF">
<p>Is it possible to find a WIFI station with direction finding?<br></p>
<div class="gmail-m_6896349369618306786gmail-m_-3647567961907976029gmail-m_-5265793479884035023moz-signature">--
<br><img border="0" src="cid:1699d4db527461aa5681"></div></div>_______________________________________________<br>Tacos
mailing list<br><a>Tacos@amrad.org</a><br><a href="https://lists.amrad.org/mailman/listinfo/tacos" rel="noreferrer" target="_blank">https://lists.amrad.org/mailman/listinfo/tacos</a><br></blockquote></div>_______________________________________________<br>Tacos
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<div class="gmail-m_6896349369618306786gmail_signature" dir="ltr">Given a choice between two theories, take the
one which is funnier </div>
<p>
</p><hr>
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</blockquote></div>