https://github.com/miek/inspectrum
On 14 October 2015 at 17:22, Srinivasan T <tsvs...@gmail.com> wrote: > Hi Mike, > > Thanks. Where to get the software inspectrum ? > > > > *From:* Mike Walters [mailto:m...@flomp.net] > *Sent:* Wednesday, 14 October 2015 11:02 PM > *To:* Srinivasan T > *Cc:* Dave New; hackrf-dev > > *Subject:* Re: [Hackrf-dev] Decode the Signal > > > > Wi-Fi will send sudden power to cause huge fluctuations - here's a picture > of it doing that: http://i.imgur.com/txXyOXB.jpg > > Since you're sampling at 2MHz, the Wi-Fi channel is much wider than your > view, so you see the whole noise floor rise. > > > > On 14 October 2015 at 15:14, Srinivasan T <tsvs...@gmail.com> wrote: > > Hi There, > > > > Thanks. > > > > *The details that I can gather from RF that interfere :* > > > > 1. The Wi-Fi router will not send sudden power to cause huge fluctuations. > It is always constant power. The graph will look like sine linear waves. > > 2. Every Radio signal has a sound. The signal that interfere at 2.4 GHz is > not Wi-Fi sound. ( Totally different sound ) > > 3. The density value for 2.4 GHz really high unless you near to the source > at 10 cm distance > > 4. Waterfall Images for Radio Signal at 2.4 GHz is really not matched with > available waterfall image for 2.4 GHz. ( I compare with metageek waterfall > images ) > > 5. AirMagnet XT is really can identify thousands of patters of > interference at 2.4 GHz but this time Air Magnet XT detected as new FFT > pattern. > > 6. There is always RF which has power around -20 dBm to -40 dBm ( > Everywhere - Singapore ,Malaysia and Indonesia ) > > 7. Modulated at low frequency ( 30-100 Hz ) and it deliver small > electricity > > > > I have captured the signal using kismet manual to save the file to .iq but > I dont know on how to go further. > > > > Regards > > > > Srinivasan T > > > > *From:* Dave New [mailto:d...@densbe.com] > *Sent:* Wednesday, 14 October 2015 10:10 PM > *To:* Srinivasan T; 'Mike Walters' > *Cc:* 'hackrf-dev' > *Subject:* RE: [Hackrf-dev] Decode the Signal > > > > Some (all?) WiFi access points "poll", that is, if they currently have no > active connections, they go through a sleep/wake cycle where you will see > the signal appear and disappear in cycles. > > > > I saw this on the Comcast/Xfinity Technicolor router that they started > shipping to their customers earlier this year in certain US markets. Their > router has three different signals running, one of which has no SSID. The > other two are your locally-defined wireless network, and the much-maligned > "xfinity wireless" which Comcast claims is to provide "free" WiFi to the > world (or at least to your neighbors). It's really not free in the respect > that you have to be a Comcast customer with a valid login to use it, and it > obviously is using someone else's (not Comcast's to be sure) electricity to > host the signal (and your bandwidth). But I digress. > > > > The 3rd signal turns out to belong to Comcast/Xfinity's wireless home > security system, and is there whether or not you've paid for that option. > If you use a simple app like WiFi Analyzer on an Android phone, you can see > this signal come and go in a few second cycle, essentially polling for its > home security devices. Since there were none at my place (that belonged to > Comcast) it instead managed to effectively interfere with my local wireless > network. Apparently a number of wireless clients are befuddled with having > a strong signal come and go on the channel they are trying to use. The > result was a number of devices kept complaining about getting disconnected, > or downloads and other streaming would halt and start, and other annoying > things. > > > > It also turned out that I couldn't move either of the other two signals > off of my chosen channel for my local network. Whenever I changed the > channel for my local network, the other two signals would follow it (?!), > thus guaranteeing that anything running on the other signals would slow > down access to my local network. What's particularly maddening about this > is that Technicolor's implementation of what have should have been a simple > VLAN exercise is flawed. It should have worked, but apparently they can't > program their way out of a paper bag. At my workplace, we use access > points that are running up to 16 VLANS (hosting such things as a guest > network, employee network, visiting employee network, supplier network, > etc, etc), and they perform flawlessly. > > > > I put up with this for about a week, and took the router back to the local > Comcast office and told them I didn't want it. I went out and bought an > Arris/Motorola Surfboard 6121 cable router which does not have wireless in > it, and a Cisco wireless firewall/router. Everything now runs fine, and > I'm no longer fighting with two other signals I didn't want and did not > intend to use. > > > > 73, > > > > -- Dave, N8SBE > > > > -------- Original Message -------- > Subject: Re: [Hackrf-dev] Decode the Signal > From: "Srinivasan T" <tsvs...@gmail.com> > Date: Wed, October 14, 2015 9:11 am > To: "'Mike Walters'" <m...@flomp.net> > Cc: 'hackrf-dev' <hackrf-dev@greatscottgadgets.com> > > Thanks. > > I can see that there is one signal interfere at 2.4 GHz. > > > > Do you want me to capture .iq file using 20 M ? > > > > *From:* Mike Walters [mailto:m...@flomp.net <m...@flomp.net>] > *Sent:* Wednesday, 14 October 2015 7:14 PM > *To:* Srinivasan T > *Cc:* hackrf-dev > *Subject:* Re: [Hackrf-dev] Decode the Signal > > > > The signal in the first and second videos is Wi-Fi - if you use a sample > rate of 20M you can see it much clearer. > > > > On 14 October 2015 at 07:28, Srinivasan T <tsvs...@gmail.com> wrote: > > > > Dear All, > > > > I am managed to do some RND with unknown Signal at 2.4 GHz. This Signal > works almost everywhere in Singapore, Indonesia and Malaysia. > > Here some video for reference : > > > > *Here is the video :* > > > > Ø *FFT at 2.4 GHz ( we can see sudden fluctuation and power in db is > really high - in Singapore at home ) * > > * https://sendvid.com/33f5hpkg <https://sendvid.com/33f5hpkg>* > > * Detail : On this video, we can see peak hold in green color that > leave a trace something comes and go* > > > > Ø *Spectrum Density of RF at 2.4 GHz ( in Medan - Indonesia )* > > * http://sendvid.com/mu9m2jeg <http://sendvid.com/mu9m2jeg>* > > * Details : I have taken this video at place where there was no > devices that operate at 2.4 GHz ( near plantations ). We can see noise > floor in blue color comes and go.* > > * This external interference cause Wi-Fi at 2.4 > GHz to fluctuate and sudden fluctuate at different power level will > increase of SNR of Wi-Fi ( signal to noise ratio )* > > > > Ø *AirMagnet XT ( in Singapore at home )* > > * Attached video file, file name ; https://sendvid.com/tkq3xz0s > <https://sendvid.com/tkq3xz0s>* > > * Details : This software one of the best software available in > the market for detection interference Wi-Fi at 2.4 GHz with different > options. We can see FFT picture at real * > > * time in leave suddenly max hold around -10 dBm. ( > We can spectrogram picture as well ). There are 2 rules to be remembered :* > > · *If power level increase suddenly to 10 dBm then the source > should be near and visible to me but on this case we dont see the source* > > · *Any RF Transmitter at 2.4 GHz will transmit at constant power > and sudden increase of power at middle of transmission really no possible.* > > > > *Wi-Fi Fluctuations at Siloam Hospital in Medan - Indonesia* > > http://sendvid.com/2u2j34m7 > > > > I would like to request on how decode header information or others of the > signal. I have captured .iq and .cfile using HackRF : > > https://www.dropbox.com/s/wj77dm4n7fj7rcl/Signal%20Capture.7z?dl=0 > > > > > > Please advise on decode the signal. > > > > Regards > > > > > > Srinivasan T > > > > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > ------------------------------ > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > >
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