Unidentified Signals

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== Unidentified Signals ==

Unidentified Signals

Browse List of Unknown Signals in Database
If you have an unidentified signal that you would like the wiki readers to take a look at please use the form linked below. Include as much information about the signal as you can including frequency, waterfall images, MP3 sound samples, location, bandwidth and anything else you can think of. Please consult the instructions here for more information on adding a signal - Adding An Example Signal.

If you happen to be able to identify a signal, please either edit the wiki (See the Adding An Example Signal page to see how to convert a signal from Unidentified to Identified) or make a note in the wiki discussion page (in the signal page click the discussion tab at the top) or make a comment in the comments area on the Unidentified Signals Database main page.

Title
Frequency range
Location
Mode
Modulation
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SMW::offSMW::on
Signal type Description Frequency Mode Modulation Bandwidth Location Sample Audio Waterfall image
14076.91 Found on 10/10/15 Beeping 14.076 kHzKiloHertz (kHz) 10^3 Hz AMAmplitude Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide
158.430.000 mhz found this sound one day but could never figure out what it was 158.43 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz pocahontas, AR 2016-09-20 (2).png
160.282.000 in Berlin, Germany Intersting signal found close to railways. Not sure about purpose. Might be PSKPhase-Shift Keying? 160,282 MHzMegaHertz (MHz) 10^6 Hz — 160,282.2 MHzMegaHertz (MHz) 10^6 Hz Berlin, Germany Bildschirmfoto 2015-12-31 um 10.10.23.png
418 MHZ 24 HOURS SIGNAL 418 MHzMegaHertz (MHz) 10^6 Hz WFMWideband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). SEVILLA / SPAIN Sin títul22o.png
Acer X222W monitor, sleep pulse Used for some PC monitors to keep the monitor's power on (or sleeping) across the spectra. Monitors may transmit whatever frequency peaks needed to keep it "on" or on sleep mode. 420 MHzMegaHertz (MHz) 10^6 Hz — 470 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation, AMAmplitude Modulation Pulse 300 kHzKiloHertz (kHz) 10^3 Hz Michigan Acer monitor default sleep signal.PNG
Bird Song Oddity Here is an Oddity Station heard on the WebSDR at the University of Twente that transmitted a loop of birds chirping. This recording is from May 16. It occurred during the nights. Some say it may have been from Germany. 6.965 kHzKiloHertz (kHz) 10^3 Hz — 6.97 kHzKiloHertz (kHz) 10^3 Hz AMAmplitude Modulation Netherlands
Broadcast FM Whistling I was scanning FMFrequency Modulation radios when suddenly I found this. Possible solution: Hobbyist single-transistor tracking transmitter. 102 MHzMegaHertz (MHz) 10^6 Hz DSBDual Side Band Modulation BroadcastFM Whistling 2.JPG
Constant beeping sound Constant beeping noise. Does not emmit any sound on other modes than CWContinuous Wave. 296.69 MHzMegaHertz (MHz) 10^6 Hz CWContinuous Wave 760 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). The Netherlands Beep11.PNG
DNA-like shifting frequencies signal It shows up as several mirror-images throughout the spectrum, some very close to each other, all of them exact copies of the original signal 800 MHzMegaHertz (MHz) 10^6 Hz — 900 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Portugal Waterfall.png
Exotic Cipher An exotic polytone data type. 6.215 kHzKiloHertz (kHz) 10^3 Hz AMAmplitude Modulation Global
FSK Data Rollercoaster Recording using USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables); baby monitor system is NFMNarrowband Frequency Modulation. 864.878 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) NFMNarrowband Frequency Modulation 32 kHzKiloHertz (kHz) 10^3 Hz Denmark Datarollercoaster.png
Heater Fan LCD display interference For use to display the LCD numbers either on a digital clock, or an outlet powered device that uses LCD's. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). AMAmplitude Modulation Pulse HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
K3UU-Unknown Comes on air every evening at 2300UTC and off air at 2400 UTC. The two frequencies where this signal is heard are always 282 kHzKiloHertz (kHz) 10^3 Hz apart. Heard on numerous EastCoast USA WebSDR receivers, although the farther north from Florida you get the weaker the signal is. Unable to hear on any South America WebSDR, as most of them are too far south. The attached recording was taken with LSBLower Side Band Modulation, bandwidth on receiver is 2.5 kHzKiloHertz (kHz) 10^3 Hz. 6.902 MHzMegaHertz (MHz) 10^6 Hz — 7.184 MHzMegaHertz (MHz) 10^6 Hz LSBLower Side Band Modulation Unknown Florida, also heard on New Jersey WEBSDR
Maybe XF faders Sounds like XF Faders 4.5 MHzMegaHertz (MHz) 10^6 Hz kHzKiloHertz (kHz) 10^3 Hz
Noise on 160m Hi, this noise has recently appeared on top band, 160m and I wondered if anyone has any idea of it's origin. Speculation is that it is over the horizon radar coming from France. Any suggestions would be greatly appreciated since it is destroying a UK net that has been running on 1933 for many years. 1.933 MHzMegaHertz (MHz) 10^6 Hz UK 160 noise.jpg
Noise over all HF bands Strange noise that starts middle of a day and ends in the evening. All HFHigh Frequency (3-30 MHz) bands are almost covered ( after 17MHz it starts to fade) clearly are visible harmonics. Estonia, Viljandi Qrm1.jpg
Nokia Adaptive Message Terminal The Nokia Adaptive Message Terminal, also known as Nokia Adaptive Burst Modem, is a Finnish encrypted messaging system suggested to be used by Finnish Intelligence Services. MHzMegaHertz (MHz) 10^6 Hz — 30 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz — 1.6 kHzKiloHertz (kHz) 10^3 Hz Worldwide 300 Bd semiidle stanag 4202.jpg
Oddity AM AMAmplitude Modulation AMAmplitude Modulation Screen Shot 2016-06-19 at 9.03.04 PM.png
One of many signals near 877 MHz There are a lot of signals like this around 870 MHzMegaHertz (MHz) 10^6 Hz. 877.875 MHzMegaHertz (MHz) 10^6 Hz RAW 2.55 MHzMegaHertz (MHz) 10^6 Hz Barnwell County, South Carolina Mysterysignal877.png
One with squelch Left signal keeps period pretty well. Haven't noticed any changes yet. It's not always active, but I can see it most of the day. IQ available 137.5 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation? 60 kHzKiloHertz (kHz) 10^3 Hz Australia Two one with squelch.jpg
Possible low level wind shear alert system Frequency matches known wind shear alert system frequencies used in aeronautics. Captured near an airport, so this is likely, but have no way to confirm. 409.572 MHzMegaHertz (MHz) 10^6 Hz CWContinuous Wave 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). United States Ss+(2015-09-29+at+12.58.34).jpg
Pulsating squelch noise A pulsating squelch noise that continues on 24/7. 424.77 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Netherlands 2werwerwer.PNG
RF signal modulate at low frequency Signal IQ file can be downloaded from Microsoft file server :

Download files at : https://1drv.ms/u/s!AvlNmSqrGlNVgTF6qyGs9d8h3fBS

Note : File is +/- 2 GB

Waterfall image : https://1drv.ms/i/s!AvlNmSqrGlNVgWivmYjg2UxL-zM1

Sound File :

https://1drv.ms/u/s!AvlNmSqrGlNVgTF6qyGs9d8h3fBS
HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Random - Dynamic Frequencies Not Known Indonesia,Malaysia, Singapore
Radiomodem Electric utility radiomodem sensor network 413.3 MHzMegaHertz (MHz) 10^6 Hz FSKFrequency-Shift Keying? NFMNarrowband Frequency Modulation 25 kHzKiloHertz (kHz) 10^3 Hz Finland F413 300.png
Radiomodem 423 875 Electric utility radiomodem network. Probably Satel radiomodem. 423.875 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying? 25 kHzKiloHertz (kHz) 10^3 Hz Finland F423875.png
Repeated across HF Strong CWContinuous Wave signal at approximately 3.064 kHzKiloHertz (kHz) 10^3 Hz, changes to 3.079 kHzKiloHertz (kHz) 10^3 Hz once per second for about a quarter of a second and then back. Possibly very fast sweep. Echos of it across the lower HFHigh Frequency (3-30 MHz) spectrum. Pauses on the high side periodically then resumes. Usually active during daylight hours, but not at night. 3.064 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave Frequency Shift 15 kHzKiloHertz (kHz) 10^3 Hz approx 1 per second 15 kHzKiloHertz (kHz) 10^3 Hz NW Florida 150px
Searching 446.475 Le 09/10/2016

Réception sur plusieurs Fréquences sans identification de ce que cela est???

Receiving multiple frequencies without identifying what it is?
446.475 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Haut de France 59 446475.jpg
Signal that is moving down Weird signal that moves slower the lower it gets down the band. If the mode is set to NFMNarrowband Frequency Modulation, WFMWideband Frequency Modulation, AMAmplitude Modulation and probaly some more it doesn't give any sound. However in CWContinuous Wave and RAW it sounds like a high pitched noise. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). The Netherlands Reww.PNG
Sounds like a pager This sounds like a pager but PDW couldn't detect anything, so it might be some other digital communication. 75.58 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Unknown 12.5 kHzKiloHertz (kHz) 10^3 Hz Barnwell County, South Carolina Mysterymodempic.png
Strange Signal I can only receive this Signal inside my House. As soon as i leave my yard i am not able to receive it anymore. 27 MHzMegaHertz (MHz) 10^6 Hz — 446 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation ? kHzKiloHertz (kHz) 10^3 Hz Somewhere in my House Waterfall of the Signal.jpg
Strange beeps @1.2ghz strange beeps @ the 1.200018 range (my rtl-sdr isn't calibrated right, so there may be frequency drift on my end) 1,200.019 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) OOKOn-Off Keying Modulation 4.5 kHzKiloHertz (kHz) 10^3 Hz USA STRANGE.jpg
Strange signal starst at 13388-13640 khz The beeper strange signal that I have been hearing for months

I was on the beach at our lake , coordinates 50:12' 30" N 117:17'44" W I have a Tecsun PL606 receiver 20160819 Fri 1800 gmt The beeper , beeps at HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). repetition rate , does not appear to be data, it beeps for about a minute then there is a short data burst then beeping again for a minute or 2 this went on for over an hour beep beep beep station on all frequencies between 13400-13800khz then on 20160820 start 1745 gmt the beeper is not on 13400-13800 but now on all frequencies between 12120 -12250

update I received it when
HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Am ? HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Vernon Bc Canada
Strong UNID Horn-like signal Incredibly strong horn-like signal. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). LSBLower Side Band Modulation FMFrequency Modulation 250 kHzKiloHertz (kHz) 10^3 Hz Alabama, USA Loudbuzzing2.PNG
UNID Bursts This is a baby monitor located on the European ISM band. Most likely the data being transfered in an USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) modulation 864.95 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 6.31 kHzKiloHertz (kHz) 10^3 Hz The Netherlands Deretgdfgdfgdfgfdg.PNG
UNID Telemetry This is a frequency I picked up in my home town, I believe it is telemetry from a water tower, but would like to know what standard it is using and if there's any way I can find a program that will decode its information. 461 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). NFMNarrowband Frequency Modulation 10 MHzMegaHertz (MHz) 10^6 Hz Australia TELEMETRYPIC.jpg
UNID Telemetry, pulsing I couldn't get an IQ sample in time because the signal started fading out. Hopefully this is not a problem. 443.287 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying Netherlands, Drenthe 123123123123123123123123.PNG
Unid ISM 900MHz Many frequency hopping ISM bursts. Telemetry of sorts. IQ file available 903 MHzMegaHertz (MHz) 10^6 Hz — 914 MHzMegaHertz (MHz) 10^6 Hz New York City, USA ISM 900.jpg
Unid Low VHF It is going 24/7, sometimes one stations, sometimes two. I believe it is something from the military. Location Kempele, Finland. 40.665 MHzMegaHertz (MHz) 10^6 Hz 2.4 kHzKiloHertz (kHz) 10^3 Hz Finland Unid low-vhf1.jpg
Unid analogue signal - ecg like HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). waterfall ? 50 kHzKiloHertz (kHz) 10^3 Hz Italy 201607301318utc 008202k.jpg
Unidentified 433Mhz Oscillating Signal Band Reserved to ISM and LPD applications, unknown type of signal. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)? kHzKiloHertz (kHz) 10^3 Hz Italy Unidentified.jpg
Unidentified 466 MHz digital signal This signal changes frequencies every few seconds inside a range between 460-470 MHzMegaHertz (MHz) 10^6 Hz. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). 2FSK? Germany 2fsk signal 466.050MHz.png
Unidentified Bus Timetable Data Hi there, our local bus company in Aberdeen transmits timetable information to bus stops using this mode... but I can't identify what type of transmission it is. Hope someone can help! Received on 204.9625 MHzMegaHertz (MHz) 10^6 Hz in Aberdeen, Scotland. 204.963 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Scotland Bus timetable.png
Unidentified FSK Signal Unidentified FSKFrequency-Shift Keying signal at 450.994MHz, audio file on page. (Not sure how to edit wiki properly.) 450.994 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Santa Rosa, CA No Audio File 150px
Unidentified Signal at 2.4 GHz The signal works at 2.4 GHzGigaHertz (GHz) 10^9 Hz and the affected most of channels at 2.4 GHzGigaHertz (GHz) 10^9 Hz.There is always increase of SNR at various channels for Wi-FI signals. This Signal is modulated at low frequencies ( 30-100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). ). HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). unk Southeast Asia Waterfal2.4ghzunk.png
Unidentified idling channel Unknown idling channel. Morse code identifier translates to WIM662 NYPD. Possible trunking or 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.? 483.662 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz New York City Unknown idling .jpg
Unindentified 438p838 Should be related to radiolocation services according to Croatia's signal allocations. 438.838 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Split, Croatia Sig.PNG
Unknow Happy new year and human voice The radio with happy new year melody and human voice 27.11 kHzKiloHertz (kHz) 10^3 Hz — 27.113 kHzKiloHertz (kHz) 10^3 Hz Unknown Unknown HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Unknown Aaaaaaahappynewyear.JPG
Unknow signal lewis county Washington state recording on a PDA off of a unshelded Mic line. also heard on the AMAmplitude Modulation radio band at random times. I have heard it on my car radio at 1000khz, 1420khz, 530khz and intercoms , PA systems over 33 miles apart. MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation Lewis County, Washington.
Unknown 139p650 Central Texas receiving location 139.65 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz Central Texas U139p650.png
Unknown 142p398 Posting a unidendified sound. Sound like a MotoTrbo but chopped. Frequency hopping? 142.399 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Norway Unknown 142p398.jpg
Unknown 14p219 What appears to be a FSKFrequency-Shift Keying / RTTYRadio TeleTYpe signal with unknown origin... Mark - Space @ 2100 - 1900 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). from centre frequency. 14.219 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Screenshot from 2016-08-19 08-46-52.png
Unknown 151 Carrier repeats every 4 seconds, signal every 5 seconds. Received in New London County. 151.195 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz United States Unknownsignal1.png
Unknown 152.179 Unknown signal 152.179 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 25.23 kHzKiloHertz (kHz) 10^3 Hz USA, PA UnKnown.PNG
Unknown 154p4635 154 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). nfm kHzKiloHertz (kHz) 10^3 Hz Ohio Usa Unk154.4635.png
Unknown 155p5 I have found an unknown signal at 155.500 Mhz in germany, Hameln near Hannover. This continuously signal has a bandwidth of 15 kHzKiloHertz (kHz) 10^3 Hz. 155.5 MHzMegaHertz (MHz) 10^6 Hz ??? 15 kHzKiloHertz (kHz) 10^3 Hz Germany Unknown 155p5.jpg
Unknown 155p6 I added the interesting signal's waterfall image and sound and I record it in Turkey, Central Anatolia. I hope it can be solved 155.6 MHzMegaHertz (MHz) 10^6 Hz Turkey, Central Anatolia Unknown 155p6.jpg
Unknown 158 I found this signal on 158.665 MHzMegaHertz (MHz) 10^6 Hz, which according to Industry Canada belongs to our local public works department. 158.665 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Unknown158 Waterfall.jpg
Unknown 161p995 Noisy signal from Italy. 161.995 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Italy Unknown 161p995.jpg
Unknown 167 I've recieved this signal at 167,400MHz and recorded it as NFMNarrowband Frequency Modulation (Bandwidth 8000). Location: Madrid, Spain. 167.4 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Madrid, Spain Unknown 167.png
Unknown 171.651600 MHz short pulses 171.652 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Possibly FSKFrequency-Shift Keying? 20 kHzKiloHertz (kHz) 10^3 Hz Ukraine 171p651600.png
Unknown 173 173.262 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Unknown173 Waterfall.png
Unknown 175p4968 I found this very slow frequency-modulated signal on 175.4968 MHzMegaHertz (MHz) 10^6 Hz. In Belgium, this part of the spectrum is allocated for wireless microphones and audio connections for broadcast services. It might also originate from the Netherlands, as I'm not living far from the border. Every few minutes, the signal shifts up about 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). for a while, before shifting back down. 175.497 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Belgium Unknown 175p4968.jpg
Unknown 18p880 Obviously not data, but likely something. My guess would be something like a buoy. 18.88 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Unknown 2.7 MHzMegaHertz (MHz) 10^6 Hz Brisbane, Australia Image.PNG
Unknown 1p296 unknown noise or signal? 1.297 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Europe Izrezak24.PNG
Unknown 2.42 GHz Captured on a HackRF, 2.42 GHzGigaHertz (GHz) 10^9 Hz band. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). RAW Ss (2016-03-05 at 12.25.25).png
Unknown 218.800 This is coming from a wastewater management RTU manufactured by Data Flow Systems. Their systems can use communication protocols such as "Modbus ASCII, Modbus RTU, Modbus TCP/IP, Allen Bradley DF1 Serial, Seiscore, Uniface, Motorola Intrac, TAC II Serial, and TAC II TCP/IP." Unknown type of modulation. 218.8 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz Central Florida 218mhz.JPG
Unknown 220 Received in New London County. 220.914 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz United States Unknown 220waterfall.png
Unknown 25kHz channel 800 MHz band Strange 25 kHzKiloHertz (kHz) 10^3 Hz wide signal, possible trunking control or data. 850 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 23 kHzKiloHertz (kHz) 10^3 Hz New York City Ss (2016-01-12 at 10.55.58).jpg
Unknown 40 Hi,I found a strange signal on 40.693mhz, maybe you know what this is and/or could add this to your sample list. It has a bandwidth of about 4000-5000 hz and the low part repeats about every 2,5 seconds, the high part every 5 seconds (as shown in picture 1 rec1.png). Sometimes (2-3 times an hour) this signal has some variations - show in picture 2 rec2.png. I also provided you an audio sample of about 20 seconds, recorded in RAW. Do you know what this signal could be? Its online 24/7 since a month now. regards, Auge 409.6 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide Unknown40 Waterfall.jpg
Unknown 40 2 Last Thursday I received some digital signals very close to each other that I have never heard before, it looked like this: http://i.imgur.com/00HQUs3.png and on NFMNarrowband Frequency Modulation it sounded like this: http://picosong.com/PAPC/.It appeared during sporadic E conditions and I heard a lot of people from the UK on the 50MHz band. It could very well be a signal originating from the UK, I received the signal in the south of The Netherlands. 40 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). South of The Netherlands Unknown40 2 Waterfall.jpg
Unknown 40 3 Sounds like a ringing phone. 40.672 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Unknown40 3 Waterfall.jpg
Unknown 405p822 Obvious bursts, unknown modulation. Long burst heard every 5-10 seconds on average. IQ file in description. First thought is some kind of trunking, as it is very close to the band where trunking radio is usually seen. 405.822 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation Unknown 1.5 kHzKiloHertz (kHz) 10^3 Hz Brisbane, Australia Unknown 405p822 Waterfall.PNG
Unknown 409 Unknown chirping like sound. Has BPSKBinary Phase-Shift Keying (1 bit per symbol) modulation, ~600 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. 409.6 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying Worldwide Unknown 409.jpg
Unknown 423p15 Unknown at 423.15 MHzMegaHertz (MHz) 10^6 Hz. 423.15 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 10 kHzKiloHertz (kHz) 10^3 Hz Unknown 423p15.png
Unknown 433p120 I found a strange signal on 433.120MHz. Unfortunately I can not read it, so I'm sending it to you. 433.12 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation 433.12 MHzMegaHertz (MHz) 10^6 Hz Germany Unknown fast.png
Unknown 434p450 Maybe FSKFrequency-Shift Keying modulation ?

The transmission is continuous for at least 6-8mn but is not all time continuous (no burst).

Earlier the same day i received the same signal on 434.425 MHzMegaHertz (MHz) 10^6 Hz
434.45 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz France 434p450 1.JPG
Unknown 435p150 Trunking Please help identify this trunk
Unknown 441p660 Seems to have disappeared as of writing this edit. Croatian allocation tables point to it being radiolocation. 441.66 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Croatia Unknown 441p660.png
Unknown 443p685 Most likely PMR or PAMR according to Croatia's frequency allocation table. 443.685 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Croatia Unknown 443p685.png
Unknown 443p886 443.886 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation Croatia Unknown 443p886.png
Unknown 443p936 443.936 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation Croatia Unknown 443p936.png
Unknown 445 Unknown. Sent from video clip. 445.363 MHzMegaHertz (MHz) 10^6 Hz ? HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). UK Unknown445 Waterfall.png
Unknown 446 I've found a strange signal on 446 MHZ Band in Italy, it seems like a multi channel signal (maybe RTTYRadio TeleTYpe?). I'm attaching an image and a 2 seconds IQ sample. 446 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Unknown446 Waterfall.jpg
Unknown 451p4500 Intermittent digital, and occasionally morse code, possibly trunked? 450 MHzMegaHertz (MHz) 10^6 Hz — 470 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) USA Unidsmartmeter.png
Unknown 452p862 452.863 MHzMegaHertz (MHz) 10^6 Hz CWContinuous Wave 1.99 kHzKiloHertz (kHz) 10^3 Hz Unknown Unknown 452p862.png
Unknown 455 455 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Unknown455 Waterfall.png
Unknown 458p208 Transmitted all the time at roughly 458.208 MHzMegaHertz (MHz) 10^6 Hz (center frequency), in four distinct frequencies separated by about 12.5 KHzKiloHertz (kHz) 10^3 Hz. Each of the signals is roughly 5 KHzKiloHertz (kHz) 10^3 Hz in bandwidth. The signals are received in Portugal near Lisbon. 458.208 MHzMegaHertz (MHz) 10^6 Hz ??? kHzKiloHertz (kHz) 10^3 Hz Portugal near Lisbon Unknown 458p208.jpg
Unknown 464.75 MHz Common signal found throughout Michigan. Can have various rhythms. Did find out on KB9KUD that this type used for updating transmitter data... Edit: this signal disappeared as of the end of October. Another one is still in use around the area, but with twice the rhythm speed, and on a different frequency. 461.8125. 460 MHzMegaHertz (MHz) 10^6 Hz — 465 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation QAMQuadrature Amplitude Modulation 10 kHzKiloHertz (kHz) 10^3 Hz Grand Rapids, MI 464.75 MHz transmission waterfall.PNG
Unknown 465p925 possible bus Possible bus stop wireless system? 465.925 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying? 10 kHzKiloHertz (kHz) 10^3 Hz Palermo, Italy Unk BUSpossible 20151111 102834Z 465925088Hz AF.jpg
Unknown 467p260 Found at 467.260 MHzMegaHertz (MHz) 10^6 Hz. First thought to be packet radio but it isn't. 467.26 MHzMegaHertz (MHz) 10^6 Hz
Unknown 468p003 Message coded on 3 to 8 tones. Frequencies changing randomly. Transmitting continuousely 468 MHzMegaHertz (MHz) 10^6 Hz — 468.005 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) N/A kHzKiloHertz (kHz) 10^3 Hz Chicago, IL, USA 468.003MHz-Moving.png
Unknown 469 Found on 469.975 FMFrequency Modulation on my ICOM HT can't get waterfall cause I don't have my RTL-SDR here. When I'll have a better recording I'll send it. It sounds like the portable traffic lights but it not the same... 469.975 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Israel
Unknown 487p001 487.001 MHzMegaHertz (MHz) 10^6 Hz 2015-05-29 21-56-04.png
Unknown 504p690 IQ FILE IN DESCRIPTION Signal which looks like a very wide 4MSK, but also has some tones to either side of the 4 main tones. Seen at 22:38 AEST, but not at 22:42 AEST. 504.625 MHzMegaHertz (MHz) 10^6 Hz Unknown Unknown HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Brisbane, Australia Unknown 504p690 Screenshot.PNG
Unknown 550 Unknown FSKFrequency-Shift Keying? 550.06 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) kHzKiloHertz (kHz) 10^3 Hz Worldwide Unknown550 Waterfall.jpg
Unknown 648 Frequency shifting. Received in New London County. 648.01 MHzMegaHertz (MHz) 10^6 Hz CWContinuous Wave 300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Unknown 648waterfall.png
Unknown 75p219 Croatian allocation tables point to it being aeronautical radionavigation. Appears every 10 seconds or so. 75.219 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 16 kHzKiloHertz (kHz) 10^3 Hz Croatia Unknown 75p219.png
Unknown 7p585 Possibly OTHOver The Horizon (very long range) radar. 7.585 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) kHzKiloHertz (kHz) 10^3 Hz Croatia Sd.png
Unknown 83 Unknown 83.7 MHzMegaHertz (MHz) 10^6 Hz ? HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Unknown Unknown83 Waterfall.jpg
Unknown 854p862 A strange signal that DSD+ couldn't make sense of. It looks a lot like an ultra-narrow GSM. 854.862 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Unknown 12.5 kHzKiloHertz (kHz) 10^3 Hz Barnwell County, South Carolina 854p862.png
Unknown 855p2 Possible telemetry or paging of some sort. Has subtle data bursts. 855.211 MHzMegaHertz (MHz) 10^6 Hz — 855.237 MHzMegaHertz (MHz) 10^6 Hz 10.5 kHzKiloHertz (kHz) 10^3 Hz — 20 kHzKiloHertz (kHz) 10^3 Hz New York City, USA Unk 800.jpg
Unknown 855p537 Chirp Chirp. Possible FSKFrequency-Shift Keying. No other information. IQ file provided. 855.537 MHzMegaHertz (MHz) 10^6 Hz FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz New York City, USA CHIRP unk.jpg
Unknown 856 The antenna has a Yagi pointed to West from 23.5° South latitude, 47.46° West longitude. The signal can be local or from the sky. The signal is horizontal polarized. 856 MHzMegaHertz (MHz) 10^6 Hz Unknown HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide Unknown856 Waterfall.jpg
Unknown 858p9 Found on 858.9538MHz and 859.0544MHz. IQ ZIP in description. 858.954 MHzMegaHertz (MHz) 10^6 Hz — 859.054 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation 12 MHzMegaHertz (MHz) 10^6 Hz Brisbane, Australia Unknown 858p9 HDSDR.PNG
Unknown 85p4748 I can see the exact same signal with RTL-SDR, HackRF, Airspy, with different computers, so I am ruling out a birdie. The break every 6 seconds is what makes this signal stand out, as something oddball. 85.475 MHzMegaHertz (MHz) 10^6 Hz kHzKiloHertz (kHz) 10^3 Hz Ireland Unknown withgaps.PNG
Unknown 86p137 This signal is emitted constantly every 5 seconds approximately. The power varies constantly. 86.137 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 30 kHzKiloHertz (kHz) 10^3 Hz France, Limoges 28 09 2016 86.137 NFM.png
Unknown 877p5 Possibly a 3G WCDMA signal, although a bit wider than expected. 887.5 MHzMegaHertz (MHz) 10^6 Hz 4.4 MHzMegaHertz (MHz) 10^6 Hz South Carolina Wikipiceclr.png
Unknown Chirping 2 Continuous bursts. Audio sample recorded in NFMNarrowband Frequency Modulation. Comment: Transmitted by a company that has water purifiers near my city. I know because i’ve done 2 stages in this company and i’ve seen the radio. It should recive the water level from the tanks and other things. 162.863 MHzMegaHertz (MHz) 10^6 Hz — 936 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Worldwide UnknownChirp2 Waterfall.png
Unknown Data Chirping Continuous signal. Audio sample recorded in NFMNarrowband Frequency Modulation. 152.652 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide UnknownDataChirp Waterfall.png
Unknown FSK 434.325M 434.325 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FSKFrequency-Shift Keying? 10 kHzKiloHertz (kHz) 10^3 Hz Austria 434325000.jpg
Unknown FSK Blips I see what looks like some sort of AFSKAudio Frequency-Shift Keying all over 454MHz (looks like several channels of it). Most of the time it's the short bursts as can be seen in the waterfall, but occasionally it breaks out into a much longer ramble. It also sounds as though the carrier drifts up and down a bit during these longer bursts. In AMAmplitude Modulation or FMFrequency Modulation, it just sounds like someone keying a mic every second, but on sideband it sounds much more interesting, like the attached file. Cheers 454 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Fskblips.png
Unknown Ham Signal All found on the 20m band. Radio frequency's are 14.109, 14.166, 14.224, and 14.340. I'm in the Los Angeles, California area. 14.109 MHzMegaHertz (MHz) 10^6 Hz — 14.34 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) California Sig video.png
Unknown Helix Helix shape possibly due to under sampling in the waterfall display? 456.368 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Unknown Unknown Helix.JPG
Unknown MDT Frame-based data link, repetitive regular frames. Modulation speed measured at 2400Bd. PSKPhase-Shift Keying modulation looks like, possibly 8-PSK8-Phase Phase-Shift Keying (3 bits per symbol), so ~7200bps. 477.588 MHzMegaHertz (MHz) 10^6 Hz — 856.325 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying 5.5 kHzKiloHertz (kHz) 10^3 Hz New York City; San Diego Unk data link .jpg
Unknown Marine Band 157.740 157.74 MHzMegaHertz (MHz) 10^6 Hz, 157.74 MHzMegaHertz (MHz) 10^6 Hz RAW USA, MA
Unknown NFM Squelch system Very low hum, not a constant tone. Repeating pulses, and pulses seem to differ between different NFMNarrowband Frequency Modulation channels of the system being used. Possible squelching, XTCSS? 855.112 MHzMegaHertz (MHz) 10^6 Hz — 855.362 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation FMFrequency Modulation 10 kHzKiloHertz (kHz) 10^3 Hz New York City, USA Unk sqlench.jpg
Unknown Numbers Station 4p723 Numbers station heard 12:26 AMAmplitude Modulation AEST on 2015-01-19. Delivers a stream of numbers and letters in phonetics. Begins with "All stations, all stations, this is ?". Finishes with "This is ? out". Cannot hear it myself - anyone else have better ears? 4.723 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) kHzKiloHertz (kHz) 10^3 Hz Australia Unknown Numbers Station 4p723 Waterfall.PNG
Unknown Out of Band ISM 'Out of Band (Australia)' Unidentified digital wideband signal seems to have origins in the US ISM band - Shouldn't be below 915MHz Downunder! 900 MHzMegaHertz (MHz) 10^6 Hz 10 MHzMegaHertz (MHz) 10^6 Hz Australia Echuca 9V1 FFT Screen.jpg
Unknown Pear Here was a pear shape happened 3 times tonight.Sorry to say I didn`t get the audio. I was lucky to get 2 images. Unknown pear 1.png
Unknown Pulsing Periodic pulses. Sound sample recorded in USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) mode. Possibly a GlobeWireless signal. MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide UnknownPulsing Waterfall.png
Unknown Pulsing Signal An overpowering signal at 149.5mhz in North Potomac, Maryland, USA 149 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). WFMWideband Frequency Modulation QAMQuadrature Amplitude Modulation? 150 MHzMegaHertz (MHz) 10^6 Hz North Potomac, MD, USA SS.PNG
Unknown Pulsing Type of Signal 7.404 kHzKiloHertz (kHz) 10^3 Hz — 7.438 MHzMegaHertz (MHz) 10^6 Hz Unk Unk kHzKiloHertz (kHz) 10^3 Hz Capture3.PNG
Unknown Radar I often see this signal, and it lasts for literal hours. It sounds very similar to a microwave running, and looks as if Kontayner had a little brother. It's a strong signal, but not as strong as the PLUTO radar. 4.41 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation FSKFrequency-Shift Keying kHzKiloHertz (kHz) 10^3 Hz Oregon City, Oregon, USA Screen Shot 2015-10-02 at 6.56.53 PM.png
Unknown Ringing Repeats every minute. 154.646 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide UnknownRinging Waterfall.jpg
Unknown SELCAL-like signal unknown selcal-like signal, suspected military usage. Has similar format to Selcal but there is no 200ms gap between the two groups, and the first group lasts ~1260 msmilliseconds (.001 of a second). the second group lasts 1 second proper. possible variant? 8.989 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Australia Unk selcal.jpg
Unknown Signal 433p5MHz The signal repeatedly appeared and disappeared ever few minutes. It might be from a mixer trucke, that was in front of my window. 433.5 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 20 kHzKiloHertz (kHz) 10^3 Hz Unknown 433500000.png
Unknown Signal at 695 MHz Please find signal IQ file at : https://1drv.ms/u/s!AvlNmSqrGlNVgWol9WapK9zRMIJu 695 MHzMegaHertz (MHz) 10^6 Hz unknown unknown Medan - Indonesia
Unknown Telemetry Almost non-stop 411.725 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation Unknown 12 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 6 kHzKiloHertz (kHz) 10^3 Hz Kemi, Finland Datamode2.png
Unknown Thin Pulsing Unknown thin pulses. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). NFMNarrowband Frequency Modulation 10 kHzKiloHertz (kHz) 10^3 Hz Unknown UnknownThinPulses Waterfall.png
Unknown Trunking Sounds like Motorola Type II smartnet, but Unitrunker does not recognize. 452.325 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Worldwide UnknownTrunking Waterfall.png
Unknown VHF burst This is a signal I couldn't identify. I got two bursts and took away the noise between them in Audacity so they'd play back-to-back. 159.18 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation Blackville, South Carolina 159180khz.png
Unknown chirps? lot of tone chirps 750 MHzMegaHertz (MHz) 10^6 Hz. submitted by user Mitchy93 750 MHzMegaHertz (MHz) 10^6 Hz raw 15 kHzKiloHertz (kHz) 10^3 Hz Chirps.PNG
Unknown marine VHF 161.300 Sounds like FSKFrequency-Shift Keying every minute in marine VHFVery High Frequency (30-300 MHz) band near north west coast of France 161.3 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12 kHzKiloHertz (kHz) 10^3 Hz France Normandy Screenshot-2016-05-29-193825.png
Unknown modulating carrier and sidebands Pulsing signal at 228 MHzMegaHertz (MHz) 10^6 Hz, with sidebands spaced at 22.75 kHzKiloHertz (kHz) 10^3 Hz. Carrier appears to pulse at ~1.33 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). NFMNarrowband Frequency Modulation 140 kHzKiloHertz (kHz) 10^3 Hz USA
Unknown paging 940p862 Unknown paging signal, similar to FLEX in preamble tone but doesnt decode as FLEX. 1600Bd, possible PSKPhase-Shift Keying. 940.862 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12 kHzKiloHertz (kHz) 10^3 Hz United States Unk pager 940.jpg
Unknown pulses Hi. an unknown irregular pulses transmitting on 36.941 Mhz 24/7. Received by a RTL-SDR and a simple 10 meter long wire. signal is powerful all the time. 36.941 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation - 10 kHzKiloHertz (kHz) 10^3 Hz Iran, Dezful Capture1.PNG
Unknown radar or data? (see page for sound samples) Mystery solved, this is a Chinese Mulitonal Jammer. 9.045 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) PPMPulse Position Modulation 10 kHzKiloHertz (kHz) 10^3 Hz Worldwide Oddity.PNG
Unknown signal an unknown signal on the HFHigh Frequency (3-30 MHz) band, repeated on the VHFVery High Frequency (30-300 MHz). A carrier modulated with a short burst of rumbling sound every 2 seconds, transmitted non-stop 24/7. 24.574 MHzMegaHertz (MHz) 10^6 Hz — 147.455 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) unknown 70 kHzKiloHertz (kHz) 10^3 Hz worldwide Capture 1.png
Unknown signal at 444p019143 I'm new to radio and I've just found this signal. There are a few similar other signals around this one. 444.019 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Hungary SDRSharp 20160520 144330Z 444019143Hz AF.png
Unknown taxi MDT Unknown Taxi 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. dispatch mode. Suggested to be Digital Data Systems but very little evidence exists to confirm this. About 2388 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. measured, so possible 4800bps speed. 152 MHzMegaHertz (MHz) 10^6 Hz — 153 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation PSKPhase-Shift Keying United States
Unknown trnking unknown trunking channel signal 173 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation kHzKiloHertz (kHz) 10^3 Hz Worldwide NXDNTrunking Waterfall.png
Unknown trunk Unidentified (Police?) trunked radio signal in Santa Rosa, CA FMFrequency Modulation MFSKMultiple Frequency Shift-Keying HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Santa Rosa, CA No Audio File 150px
Unknown trunking or data Unidentified data signal, possibly trunking 131.188 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz UK 133187500 strangetrunking.png
Unknown-1536125 This signal continuously broadcasts in short blips. 151.782 MHzMegaHertz (MHz) 10^6 Hz — 469.761 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 10 kHzKiloHertz (kHz) 10^3 Hz USA 153 612 500-WF.png
Unknown-162 Signal was captured in Belarus(near Russia border). It is emitting everytime. Maybe this is airport signals... 162.3 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz Belarus 162-343.jpg
Unkown 0p012 Unknown VLFVery Low Frequency (3-30 kHz) signal ~12.5 kHzKiloHertz (kHz) 10^3 Hz. Interference every 10-30 minutes: 2-3 ~12.5 KHzKiloHertz (kHz) 10^3 Hz tones, separated by approximately a second. 12.5 kHzKiloHertz (kHz) 10^3 Hz VLFVery Low Frequency (3-30 kHz) 24 kHzKiloHertz (kHz) 10^3 Hz Minnesota, USA UNKWN 00p012.png
Unkown 707p999 FSK 707.999 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) FSKFrequency-Shift Keying 11 kHzKiloHertz (kHz) 10^3 Hz Chicago, IL, USA 707.999 - FSK- USB - 11k.png
Water Tower Com to water pumps Telemetry data for water pumps & water towers for water distribution. 447.238 MHzMegaHertz (MHz) 10^6 Hz — 457.438 MHzMegaHertz (MHz) 10^6 Hz NFMNarrowband Frequency Modulation 12.5 kHzKiloHertz (kHz) 10^3 Hz Ohio Usa Watertx2.png
Weird moving signal Found this signal while just scanning around. Original thought it could be something to do with the local airport, such as radar or something. But this signal has only appeared in the last couple of days. 117 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) kHzKiloHertz (kHz) 10^3 Hz United Kingdom Weird signal.png
Wide signal at 443.5 MHz 443.5 MHzMegaHertz (MHz) 10^6 Hz WFMWideband Frequency Modulation Unknown 125 kHzKiloHertz (kHz) 10^3 Hz Barnwell County, South Carolina 443p5unid.png

List of Unknown Signals in Database


Comments

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


Linkz

562 days ago
Score 0+-

Hello guys I solved some unid HFHigh Frequency (3-30 MHz) signals of the DB today:

Unknown 6-channel VFTVoice Frequency Telegraphy = overmodulated US-MIL RATT

Unknow 13p559 = frequency of the ISM band, random industrial QRM, impossible to identify as its QRM only

Unidentified 13p045 kHzKiloHertz (kHz) 10^3 Hz = CISCommonwealth of Independent States (CIS), the former Soviet Republic-12 (mistuned)

Unknown CISCommonwealth of Independent States (CIS), the former Soviet Republic PSKPhase-Shift Keying = Russian INTEL psk


Regards

linkz

Cartoonman

559 days ago
Score 0+-
Thanks for the ids! I'm a little busy currently but i'll incorporate your changes into the signals as soon as I get a chance!

Linkz

529 days ago
Score 0+-

Hi,

FSKFrequency-Shift Keying Beacon on HFHigh Frequency (3-30 MHz)?? = Chinese MIL datalink Unid psk signal narrowband = Australian MHFCS data stream Unidentified hf digital -> add a comment about Link-11 variants

Regards

linkz

Cartoonman

528 days ago
Score 0+-
Thanks, I commented on them. Moved unid psk signal narrowband into signal page as Australian Military ISBIndependent Side Band Modulation Modem.

Tape

526 days ago
Score -1+-

"Anyone can edit a signal page by clicking the "edit with form" at the top of the page."

I was going to identify some signals, but since your completely incompetent arse can't deliver what you promise, I'll refrain from helping. (can't edit)

Cartoonman

525 days ago
Score 0+-
What was the issue? There's two ways one can edit a page. One is using the form. The other is by using edit. If you can explain the specific issue you faced when trying to edit the page, we can fix the issue.

Admin

525 days ago
Score 0+-

Yes please explain the issue so we can fix it. Everything appears to be working fine at the moment on my end.

Or are you trying to click the edit button on the main page? You need to click edit on a signal page to edit it.

Anonymous user #1

523 days ago
Score 0+-
Any info on 1536125? - LargeVirus

Cartoonman

521 days ago
Score 0+-
I dont have anything that would be useful for that one :/. It could be some packet-switched pager, or telemetry. Might even be one of those suggested signals, but I'm just guessing. Probably FSKFrequency-Shift Keying based.

Avsa242

505 days ago
Score 0+-
When I originally posted this one, I checked on the FCC's license search, and both frequencies are assigned to water towers near my area, so I'm guessing the data has something to do specifically with that.

Avsa242

505 days ago
Score 0+-
UNID Telemetry http://www.s...ID_Telemetry - minimodem consistently decodes some of this to plaintext ASCII (minimodem --rx 1200). 0:20 looks like some sort of periodic TXTransmit test (12345qrstuvwxyz). It doesn't sound exactly like the standard tones used in, e.g., APRSAutomatic Packet Reporting System, an amateur radio-based system for real time tactical digital communications of information of immediate value in the local area though, so I'm sure some settings could be tweaked a bit.

Cartoonman

493 days ago
Score 0+-
interesting, how did you decode the FSKFrequency-Shift Keying? some sort of generalized FSKFrequency-Shift Keying decoder?

Anonymous user #2

486 days ago
Score 0+-
Unknown 409 bears a strong resemblance to MPT1317. It uses exactly the same modulation and coding as MPT1327 except that multiple base stations share the same frequency hence the stopping and starting of the data bursts at regular intervals at different signal strengths.

Cartoonman

483 days ago
Score 0+-
I will definitely look into this, thanks for your observations!

Cartoonman

465 days ago
Score 0+-
I looked into it and it doesnt seem to be similar enough, unknown 409 looks to have a PSKPhase-Shift Keying modulation thing going on, but it doesnt seem to be MPT.

Avsa242

485 days ago
Score 0+-

Cartoonman,

Yes - there's a great little piece of software called minimodem (lives at http://www.w...m/minimodem/). It allows you to "receive" or "transmit" AFSKAudio Frequency-Shift Keying at any arbitrary bitrate via your soundcard. You can fiddle with all sorts of settings like mark and space tone values, start and stop bits, and a bunch more- pretty neat.

Avsa242

484 days ago
Score 0+-
I *think* Unknown Sinal 280 (http://www.s...wn_Sinal_280) is iDEN (http://www.s...twork_(iDEN) ). I see the same spectrum and hear the same sound (sounds virtually the same as the background noise) on 770-something MHzMegaHertz (MHz) 10^6 Hz; occupies the same amount of spectrum, about 18-19kHz.

Avsa242

484 days ago
Score 0+-
I posted Unknown FSKFrequency-Shift Keying Blips (http://www.s...wn_FSK_Blips) a long time ago. I think these are just some sort of idling signal sent by mobile units, as sometimes the air breaks and a National Grid tech will be talking on it.

Cartoonman

483 days ago
Score 0+-

@Avsa242: Thanks! I'll definitely play around with minimodem. I long suspected Unknown Sinal 280 to be IDEN but i just never saw my local iDEN have those bursts like that. I'm 90% certain though that it is iDEN of some sort.

The idling sequence for some radios are pretty interesting. I haven't seen a FSKFrequency-Shift Keying-based idle before. These continued bursts are definitely characteristic of an idling radio maintaining channel presence for other radios to know if they're in range and available to take a call. It would be very hard to make an article on 'idling radios' since they all seem to have their own format. the digital radios like P25 have their own, so do DMR and MotoTRBO. Analog just keys on in bursts.

Anonymous user #3

482 days ago
Score 1+-
Unknown MPT1327-Like signal appears compound modulated, i.e. FMFrequency Modulation or AMAmplitude Modulation. I will try and download it and look at it later. I suspect an underlying BB containing a V-series modem.

Anonymous user #4

474 days ago
Score 0+-

Unknown 16p4732 PSKPhase-Shift Keying Serial is a STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO).-4285. ACF 106.66mS and waterfall fit fine.

Best regards.

ANgazu.

Cartoonman

468 days ago
Score 0+-
спс ANgazu!

Anonymous user #5

465 days ago
Score 0+-
My best guess for the signals in 'Unknown 161p995' is AIS. (Ch A @ 161.975Mhz , Ch B @ 162.025Mhz)

Anonymous user #6

377 days ago
Score 0+-
The 27Mhz Happy New Year and Human Voice is no doubt 11 meter illegal CB radio operators doing their usual.

Cartoonman

377 days ago
Score 0+-
if only we could name signals 'CB Shenanigans' eh? :^)

Anonymous user #7

356 days ago
Score 0+-
"Unidentified" 158.09 is POCSAG paging on 158.1, very common

Cartoonman

356 days ago
Score 0+-
I agree, definately looks like it. Do you happen to have an IQ recording or audio sample of it? The frequency sweep intro and end look interesting, none of the POCSAG's near me have that.

Anonymous user #8

350 days ago
Score 0+-
THAT IS ASTOUNDING! Your "Unknown Pear 1" signal is PRECISELY what one would expect to see as the emissions from the startup sequence of nuclear fusion reactor using magnetic confinement, the emission would reflect the design of the reactor chamber in the sense that the chamber (acting as a resonate cavity) would be make radio emission at frequency in maybe few dozen Mcs according to the dimension of chamber inner wall and dimension of outer high-mu electromagnet poles these are used for the magnetic confinement of plasma, and oscillate from confine to release to allow more fuel and exhaust output, these type of reactor make electric current in AC from magnetic feedback from reacting plasma, then cycle repeat, at resonate frequency of chamber. These reactor ONLY has one maker and purpose, it is made in USA and Russia only and made for propel electric spy plane, population mistake for UFO of course, but line straight across USA make for medium altitude pass for picture of secret sights, only then electric spy plane make up angle and start fusion plant accelerate to ~12000 kph return to orbit. These is not new, gas rocket or jet engine spy plane SR-71 had partial version of electric propel but no fusion device SR-71 make retirement now because on the 1990 this become active make your SR-71 obsolete and new CHINA electric spy plane only pass over short altitude, make mistake for alien UFO

Cartoonman

350 days ago
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That's very interesting!. I presume these reactors are part of things like reported here: http://www.b...sion-reactor

I'll take a look into this and transfer Unknown Pear to identified Signals soon. Thanks!

LV

246 days ago
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as this is on the ham bands - it is most likely only one of those transmissions where people use some software (forgot which) to make images and spell out things on people using sdr with waterfall's screens

Anonymous user #9

176 days ago
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The 160m one is stanag.

Cartoonman

176 days ago
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I verified the baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate and it is 2400, the same as stanag. It doesn't do well on the phase plot though, but thats because of severe multipath interference. Thanks!

9A3CBX

132 days ago
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7p585 is most likely an OTHOver The Horizon (very long range) radar or something used for research of oceans/ionosphere, agree? Correct me if I'm wrong.

Cartoonman

132 days ago
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Yes, it is definitely a type of radar. As to what specific one it falls under is still a mystery. A possible candidate given the waterfall is http://www.s...twork_(JORN). But I have seen other unidentified signals with that tone in front.

Ywsia1

73 days ago
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See now what I dont understand is why wouldnt they be able to create Minimodem for windows.....? I want minimodem!! FOR MY OS!!

Cartoonman

73 days ago
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If its open source, you could compile it for windows binary

Jks

72 days ago
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"Unknown 0p006592" is Moscow time-signal station RBU (see Wikipedia for more info). You can hear it very clearly at the KiwiSDR in Moscow run by RZ3DVP http://rz3dvp.ru:8073/
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