Signal Identification Guide

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This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio such as the RTL-SDR, Airspy, SDRPlay, HackRF, BladeRF, Funcube Dongle, USRP or others.

Editing: Anyone can edit this wiki, so if you see missing or wrong information please feel free to correct it by clicking the 'edit with form' button at the stop of the signals page. When doing an edit, if you are not logged in as a user, you will be asked to answer a very simple spam prevention question which will appear at the top of the screen after clicking on Save page. If you are not experienced with editing Wiki Markup, refer to this reference card, Quick Guide of editing pages, or just email the requested changes at sigidwiki_AT_gmail_DOT_com.

Discussion: You can also discuss the signals by using the discussion tab at the top of every page, or just by using the comments box at the bottom of this page (note that the comments section will be periodically pruned to reduce its length).

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Software
Artemis 2.png

Artemis 2

Check out Artemis 2, the main companion app to this guide! Artemis 2 gives you all known reference signals in an easy to access offline format, with improved sorting and filters and offline audio samples and waterfalls.



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VLF.png

1
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16
MF.png

24
HF.png

179
VHF.png

81
UHF.png

70

Testing.png

AllSignals.png Unid.png
Military.png Radar.png Active.png Inactive.png Amateur.png Commercial.png
Aviation.png Marine.png Analogue.png Digital.png Trunked.png Utility.png
Satellite.png Navigation.png Interfering.png Requested.png Numbers.png Time.png
== Stats ==

Stats


Identified Signals in Database: 282
Unidentified Signals to be Identified: 110
Requested Signals: 57


Recently Added Signals Recently Updated Signals

Recently Added Unidentified Signals Recently Updated Unidentified Signals


Comments

Feel free to make comments about unidentified signals that you might know or anything else here.


Anonymous user #1

574 days ago
Score 1+-

I'd like to put in a request for info and signal sample on RD-LAP and also on the Motorola MDTMobile Data Terminal, A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, commercial trucking fleets, military logistics, and emergency vehicles, such as police cars, to communicate with a central dispatch office. signals that preceded the 19.2 kbpsKilobits per second (kbps) rdlap, such as MDC4800.

This is sold by Motorola as part of their DataTAC network package. It used to be active as part of the ARDIS network nationwide, but I believe that has all been retired (maybe still used somewhere? Not 100% sure)

Also, it is still used by some police departments and others with private datatac networks.

Anonymous user #2

476 days ago
Score 0+-

I found this web page full of digital signals: http://kb9ukd.com/digital

Listening to theese signals I think that Unknown Chirping 2 could be mmp-4800 but there are also other similar modes like SEAR, SCADA.

Anonymous user #2

384 days ago
Score 0+-

In response to the person who posted about the "Police Idling Walkie Talkie Radio Signal"

I have also found the same signal in the UK which is on the 70cm band it pulses every few seconds with 12MHz BW, I also noticed there is an other pulse signal 30 mhz apart which pulses at a slower pace once every 4 or 5 pulses.

Anonymous user #3

377 days ago
Score 0+-
1.8126MHZ; a female voice reading out a string of numbers in what sounds like Italian language. Heard for one hour 2100hrs GMT. This is in the Ham Radio top-band frequency range.

Anonymous user #4

39 days ago
Score 1+-

"1.8126MHZ; a female voice reading out a string of numbers in what sounds like Italian language. Heard for one hour 2100hrs GMT. This is in the Ham Radio top-band frequency range."

There's also the english version if you wait enough

METEOMAR VHFVery High Frequency (30-300 MHz) 156.425 MHzMegaHertz (MHz) 10^6 Hz by Telecom Italia

Anonymous user #3

363 days ago
Score 1+-

All the missing sound samples here: https://mega...GuGFwpEcxfaA

Please let me know if you need more.

Erbo

336 days ago
Score 0+-

Very nice wiki! very helpful! Unknown 40 is very weird.

I'm located in Quebec, Canada near Montreal, lots of signal around, some unknown.

MikeAgner

329 days ago
Score 0+-

Hi - I just joined, and noted a few things that are incorrect;

a. Serdolink is misspelled - it should be Serdolik

b. There seems to be quite a bit of confusion on the Cuban HM01 listing. DIGTRX is not a mode - it's an app originally written for digital TV, and folks try to use it to read the data sent by this station (only not very well, from what I hear). The mode is an adaptation of a ham mode known as Redundant Data File Transfer or RDFT. You can find listings for this at the well known Numbers and Oddities website, listed as 'AMAmplitude Modulation/RDFT' as the mode

In the next few days I will be adding a lot of software links. Stay tuned...

MikeAgner

328 days ago
Score 0+-

I'll add that to my list :.>>

Actually I found something on RDFT that might be of interest, and even a link for DIGTRX

http://swlin...nd-explains/

http://digtr...nformer.com/

I have a little more, but I'll save that for when I work on that article...CUL Mike

MikeAgner

322 days ago
Score 0+-

You can also find a nice summation of many of the amateur digital modes, and at least 1 web page for each, here....

http://wiki....mateur_Radio

Anonymous user #5

305 days ago
Score 1+-

The last signal "weird moving signal" I know EXACTLY what that is, it is an OLD type of telemetry signal used to remotly send the value displayed on a gauge or dial, It works by taking the circular movement of a needle on a dial (like a thermometer or pressure gauge) and connecting the shaft to a potentiometer and using the pot to control a VCO, you get the data by knowing the "center" frequency and calculating the offset value of the Continuous signal as it moves up and down, the ammount it moves is displayed at the RXReceive end by taking the difference in frequency and using that value to move a dial on a gauge.

This tech dates WAYYY back, back to the 1930's

Cartoonman

295 days ago
Score 1+-
I will look into this as soon as I get a chance, thanks!

Admin

295 days ago
Score 0+-
I thought that it was probably just be some sort of internal noise from the RTL-SDR, but this might be right too.

Anonymous user #6

241 days ago
Score 1+-
Maybe someone could add Autex from MultiPSK.

Anonymous user #7

141 days ago
Score 0+-

Anon #7 is ABSOLUTELY right about that "weird moving signal" one, it is used for what s/he said, and more, it used to be used also for seismographic sensor data collection, as follows:

Lay out a LARGE array of sensors, each with one of these analog telemetry TXTransmit units, each on a different freq. and you RXReceive it in USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) mode, like s/he said to get the data back you have to know the centre freq. and amount the offset of the signals are the data.

I was VERY shocked to see that these are STILL being used, I say that because back then the bands were almost devoid of activity, save for A1A ship to shore comms. When more and more users began to use the radio spectrum these devices were banned because they cause TERRIBLE interference!!! they roam around a centre freq. and can deviate by as much as 100 kcs up or down!

Cartoonman

140 days ago
Score 0+-
Interesting... This will be the next signal I look into. Do you know any specific names or devices of these kind of signals to ease my research?

MillMan

116 days ago
Score 0+-

CartoonMan :

Let say , it is static position. how do we figure out ?

Cartoonman

116 days ago
Score 0+-
hmm, if its a geostationary satellite, i guess you'll have to figure out the frequency for your specific part of the earth and the satellite that corresponds to that frequency. Geostationary satellites follow the earth's rotation so they stay in the same relative area of the earth, and if this is true i dont think the frequencies would be allowed to mix with other satellites in that region at least.

MillMan

104 days ago
Score 0+-

2 things :

1. Let say i know the signal comes from satellite , how do we confirm the signal comes from that particular satellite 2. I received strange waterfall pattern. http://imgur.com/SVoihWF

any comment !

Cartoonman

104 days ago
Score 0+-

the 2.4GHz range has a bunch of oddities, and i think i've seen what you got, but may not be from same transmission: http://imgur.com/AmluTy4

If you can figure out the satellite's modulation and specific frequency to be the same frequency you receive, and you do some independant tests where you try to receive indoors vs outdoors, then you can say with some evidence that your signal comes from that particular satellite. May I ask what satellite you're looking at?

MillMan

97 days ago
Score 0+-
hi there, I did at http://www.s...l_at_2.4_GHz

Cartoonman

96 days ago
Score 0+-

Is this the one you suspect to be a satellite? I *think* the 2.4GHz is ISM so many different devices operate on it (not to mention microwaves to say the least). Satellites would probably stay away from this range.

For your signal, is it possible to see how wide these bursts are? In the docx you provided i see a middle point where signal power is decreased, which would suggest that this is the center frequency of the transmission. The sidebands of it therefore must be to the left and right of the signal

MillMan

93 days ago
Score 0+-
I use AirMagnet Spectrum XT and I can see the same thing. The sound is totally different because it is not wifi sound. detected everywhere in the region. sometime it affected few channels ( 4-10 channels ).

Cartoonman

93 days ago
Score 0+-
hmm, have you been able to localize where it occurs? usually 2.4GHz stuff is near-proximity because of line of sight behavior of microwave band. It might be some sort of 2.4ghz telemetry that's really strong for some reason. It probably isn't a satellite, but then again i haven't had much experience with satellites.

Anonymous user #8

89 days ago
Score 0+-
well.. the radio sound always the same and never change and inside the flight as well.

Cartoonman

88 days ago
Score 0+-
hmm... could it possibly be noise? either from the receiver or computer?

Anonymous user #8

81 days ago
Score 0+-
no, i tried in different place where no electronics , i have same sound wit different power lovel at 2.4 GHzGigaHertz (GHz) 10^9 Hz

Cartoonman

81 days ago
Score 0+-

and you have received the same signal with a different receiver or sdr? i know some upconverters like mine emit some spurious emissions which get picked up and i was able to see them with another sdr so i could verify it was really there.

I believe 2.4GHz is ISM band so it could really be anything.

The6P4C

30 days ago
Score 0+-
I just updated my unknown signal, http://www.s...nown_504p690. I fixed the broken IQ file link, so if anyone'd like to have a look it's there. I'd be very interested if anyone can derive some meaning from it :)

Cartoonman

30 days ago
Score 1+-
I've added my analysis. You found quite a fascinating signal there. At first I thought it was just computer noise but when i analyzed it, there was too much perfection that it had to be on purpose and transmitting data.

Linkz

25 days ago
Score 1+-
oops i post on the wrong page, admin ack those informations & delete them please

Cartoonman

25 days ago
Score 0+-
Your ids have been acknowledged, thanks!

Anonymous user #9

24 days ago
Score 0+-
Señales interfirente potent en 7.120 con un ancho de banda de 15 kcc recibido en receptores SDR de España, Francia, Holanda, Suècia, Polònia, Chekia,Rusia y tambien en Australia 15.00UTC hasta 23.00 UTC Origen desconocido .

Cartoonman

24 days ago
Score 0+-

"Interfering signals in 7120 kHzKiloHertz (kHz) 10^3 Hz with a bandwidth of 15 kcc received in SDR from Spain , France, Holland , Sweden, Poland , Chekia , Russia receptors and also in Australia 15.00UTC until 23:00 UTC Unknown Origin"

lo siento si no comprendo claro.

http://puu.s...5d7b617e.jpg

I believe this is what you saw /\. I looked at WebSDR at University of Twente, and this was their log from ~6:30 UTC yesterday. If the signal was 15 kHzKiloHertz (kHz) 10^3 Hz wide, most likely 29B6 Russian Over the Horizon Radar.
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