Signal Identification Guide

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NOTE: The wiki is currently undergoing some major upgrades involving changes to the signal entry syntax to facilitate new features like user entry forms, main page sorting of signals and frequency range displays. During these next few days the wiki may be in a somewhat broken or unusable state. Please bare with us during these upgrades.


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, HackRF, BladeRF, Funcube Dongle, USRP or others.

Anyone can edit this wiki, so if you see missing or wrong information please feel free to correct it by clicking the 'edit' button at the stop of the signals page. When doing an edit 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.

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.

If you would like to contribute an example signal, please contact me at rtlsdrblog__AT__gmail__DOT__com and send a waterfall image, sound or small IQ sample and any information about the signal that you have. Note that it will probably take me 1 - 3 months to get to your signal. If you want to add a signal yourself please consult the instructions here - Adding An Example Signal. Don't worry too much if you mess up the wiki syntax, i'll eventually patrol all the pages and fix them up if something is wrong.

Software: There is now the Artemis software available which can be used to display the known reference signals in an easy to access offline format.

== Known Reference Signals ==

Known Reference Signals

Title
Frequency range
Location

Mode

Sort by order



SMW::offSMW::on
Signal type Description Frequency Mode Bandwidth Location Sample Audio Waterfall image
29B6 OTH Radar Sounder This is an Over The Horizon Radar Sounder signal from the 29B6 OTH Radar (Nicknamed "Kontayner"). It is used to check frequencies that are not in use. It commonly overlaps Amateur and broadcast shortwave bands. 9.2 MHz9,200,000 Hz
9,200 kHz
19.745 MHz19,745,000 Hz
19,745 kHz
USB 0.013 MHz13,000 Hz
13 kHz
0.013 MHz13,000 Hz
13 kHz
Russia Ss (2014-12-14 at 01.58.43).png
AFSK Paging Link It is easier to transmit the FSK pager signal to the transmitter site as AFSK. It is changed to POCSAG format when re-transmitted. 72 MHz72,000,000 Hz
72,000 kHz
75 MHz75,000,000 Hz
75,000 kHz
NFM 0.009 MHz9,000 Hz
9 kHz
0.009 MHz9,000 Hz
9 kHz
Worldwide AFSKPaging Waterfallthmb.jpg
ATSC Broadcast Advanced Television Systems Committee Television. 8VSB Modulation 54 MHz54,000,000 Hz
54,000 kHz
800 MHz800,000,000 Hz
800,000 kHz
ATSC 6 MHz6,000,000 Hz
6,000 kHz
6 MHz6,000,000 Hz
6,000 kHz
Worldwide No Audio File ATSCthmb.jpg
Aircraft Communications Addressing and Reporting System (ACARS) Short messages sent to and from aircraft. 129 MHz129,000,000 Hz
129,000 kHz
137 MHz137,000,000 Hz
137,000 kHz
AM 0.005 MHz5,000 Hz
5 kHz
0.005 MHz5,000 Hz
5 kHz
Worldwide ACARS waterfallthmb.png
Amplitude Modulation (AM) Long range commercial broadcast and international radio. Also used for aviation communications. 0.15 MHz150,000 Hz
150 kHz
137 MHz137,000,000 Hz
137,000 kHz
AM 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
Worldwide AM Waterfall.jpg
Autocab This is an example of the Autocab Media Data Terminals used by cab companies all over the world. Also this could be the answer for unknown signal Unknown 469. 163.375 MHz163,375,000 Hz
163,375 kHz
163.375 MHz163,375,000 Hz
163,375 kHz
NFM 0.0125 MHz12,500 Hz
12.5 kHz
0.0125 MHz12,500 Hz
12.5 kHz
UK Autocabthmb.jpg
Automatic Dependent Surveillance-Broadcast (ADS-B) Used by aircraft as an alternative to secondary radar. It broadcasts (i.e. unsolicited, without waiting for interrogation from a radar station) their GPS position (latitude, longitude) and pressure altitude, their callsign, and their track and ground speed, in separate messages carrying 10 bytes of data each. 978 MHz978,000,000 Hz
978,000 kHz
1,090 MHz1,090,000,000 Hz
1,090,000 kHz
None 0.05 MHz50,000 Hz
50 kHz
0.05 MHz50,000 Hz
50 kHz
Worldwide ADS-BTHMB.jpg
Automatic Identification System (AIS) Used by ships to broadcast position and vessel information. 161.975 MHz161,975,000 Hz
161,975 kHz
162.025 MHz162,025,000 Hz
162,025 kHz
NFM 0.025 MHz25,000 Hz
25 kHz
0.025 MHz25,000 Hz
25 kHz
Worldwide AIS WaterfallTHMB.jpg
Automatic Link Establishment (2G ALE) Automatic Link Establishment, 2G ALE (Official designation MIL-STD 188-141A) is the current standardized method of establishing connections between radio operators. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.002 MHz2,000 Hz
2 kHz
0.002 MHz2,000 Hz
2 kHz
Worldwide 2G ALE.jpg
Automatic Link Establishment (3G ALE) 3G ALE is the next generation of ALE (Designated by MIL-188-141B (Appendix C)). 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.003 MHz3,000 Hz
3 kHz
0.003 MHz3,000 Hz
3 kHz
Worldwide 3G ALE.jpg
Automatic Packet Reporting System (APRS) Packet system for real time data communications. Used by hams for location reporting, weather stations etc. 144 MHz144,000,000 Hz
144,000 kHz
146 MHz146,000,000 Hz
146,000 kHz
NFM 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
Worldwide AFSK1200 WaterfallTHMB.jpg
Automatic Picture Transmission (APT) Used to by the NOAA weather satellites and some Russian weather satellites to transmit satellite weather photos. 137 MHz137,000,000 Hz
137,000 kHz
138 MHz138,000,000 Hz
138,000 kHz
NFM 0.03 MHz30,000 Hz
30 kHz
0.03 MHz30,000 Hz
30 kHz
Worldwide NOAAAPT Waterfallthmb.png
Baby Monitor Wireless baby monitors often transmit NFM audio in the clear. 27 MHz27,000,000 Hz
27,000 kHz
864 MHz864,000,000 Hz
864,000 kHz
NFM 0.015 MHz15,000 Hz
15 kHz
0.015 MHz15,000 Hz
15 kHz
Worldwide BabyMonitor Waterfallthmb.png
Binary Interchange of Information and Signaling (BIIS) European Trunked Radio Standard, 1200 bps. Can transmit both voice and data 446 MHz446,000,000 Hz
446,000 kHz
446 MHz446,000,000 Hz
446,000 kHz
NFM 0.002 MHz2,000 Hz
2 kHz
0.002 MHz2,000 Hz
2 kHz
Europe BIISthmb.jpg
CHX200 CHX200 (Also known as PRC-921/GY) is a backpack HF ECCOM transceiver, designed and built by Siemens. 1.5 MHz1,500,000 Hz
1,500 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 3.0e-4 MHz300 Hz
0.3 kHz
3.0e-4 MHz300 Hz
0.3 kHz
Worldwide CHX200.jpg
CIS-11 CIS-11 is a radio duplex teleprinter system used by Russian meteorological stations. CIS-11 is also known as TORG-11. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 8.0e-4 MHz800 Hz
0.8 kHz
8.0e-4 MHz800 Hz
0.8 kHz
Russia CIS-11.jpg
CIS-12 CIS-12 (Also known as MS5, FIRE, AT-3004D, or AT-3104D) is a 12-tone PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 4800 bits/sec. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.0031 MHz3,100 Hz
3.1 kHz
0.0031 MHz3,100 Hz
3.1 kHz
Russia CIS-12TFC.jpg
CIS-14 Also known as AMOR and AMOR96. Synchronous FSK duplex teleprinter system with ARQ. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 8.0e-4 MHz800 Hz
0.8 kHz
8.0e-4 MHz800 Hz
0.8 kHz
Russia CIS-14TFC.jpg
CIS-16 Also known as CIS 16x75 Bd, CIS-16 is a MPSK-16 data system using Binary PSK. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.0027 MHz2,700 Hz
2.7 kHz
0.0027 MHz2,700 Hz
2.7 kHz
Russia CIS-16Tfcc.jpg
CIS-3000 CIS-3000 is a 8-PSK Data Modem protocol. It's source is traced to Russia. 3000 is for it's 3000bps speed. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.0034 MHz3,400 Hz
3.4 kHz
0.0034 MHz3,400 Hz
3.4 kHz
Russia CIS-3000.jpg
CLOVER 2000 CLOVER 2000 is an upgrade to CLOVER-II, a digital data protocol. In comparison to CLOVER-II, CLOVER 2000 takes up 2000Hz of bandwidth and has double the number of tone channels. CLOVER 2000 is 4 times as fast as CLOVER-II, and carries over all of the error correction algorithms from the original CLOVER-II. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.002 MHz2,000 Hz
2 kHz
0.002 MHz2,000 Hz
2 kHz
Worldwide CLOVER 2000.jpg
CLOVER-II CLOVER-II is an 8-bit digital data transmission protocol. It can transfer ASCII text and executable computer files without requiring additional control characters that other digital modes need. CLOVER-II's successor, CLOVER 2000, is 4 times as fast. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 5.0e-4 MHz500 Hz
0.5 kHz
5.0e-4 MHz500 Hz
0.5 kHz
Worldwide CLOVER.jpg
CODAR Coastal Ocean Dynamics Applications Radar 3 MHz3,000,000 Hz
3,000 kHz
50 MHz50,000,000 Hz
50,000 kHz
USB 0.05 MHz50,000 Hz
50 kHz
0.05 MHz50,000 Hz
50 kHz
Worldwide CODARthm.jpg
California Smart-Meter This is a signal from a Californian Electricity 'Smart Meter'. Each house is now fitted with one of these, and they are strong - typically 50dB above the atmospheric noise level. 902 MHz902,000,000 Hz
902,000 kHz
928 MHz928,000,000 Hz
928,000 kHz
0.015 MHz15,000 Hz
15 kHz
0.015 MHz15,000 Hz
15 kHz
USA Open-Way-Centron Smart-Meter Waterfallthmb.png
Chinese 4+4 Chinese 4+4 is a multi-carrier transmission mode. It consists of 8 carriers. They are 300 Hz apart, execpt the 4th and 5th carriers, which are 450 Hz apart from each other. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.0025 MHz2,500 Hz
2.5 kHz
0.0025 MHz2,500 Hz
2.5 kHz
China CHN 4+4.jpg
Codan Data Modem Codan Data Modulation for Codan Data Modems. Has 3 distinct signals: Data, ALE, and SELCAL. This modulation is used in Codan's 9001, 9002, 3012 and 3212 modems. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 4.0e-4 MHz400 Hz
0.4 kHz
0.00256 MHz2,560 Hz
2.56 kHz
Worldwide Codan Modem.jpg
Coquelet MFSK system, similar to Piccolo. Uses ITA-2 charset. It's two main modes are Coquelet-8 and Coquelet-13. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 3.0e-4 MHz300 Hz
0.3 kHz
5.0e-4 MHz500 Hz
0.5 kHz
Europe Coq 8 intro.jpg
D-STAR Digital voice protocol used by ham radio. Is sometimes routed over the internet for international communications. 145.67 MHz145,670,000 Hz
145,670 kHz
145.67 MHz145,670,000 Hz
145,670 kHz
NFM 0.00625 MHz6,250 Hz
6.25 kHz
0.00625 MHz6,250 Hz
6.25 kHz
Worldwide DStar Waterfallthmb.jpg
DVB-T A DVB-T signal, received on a HackRF. 538 MHz538,000,000 Hz
538,000 kHz
538 MHz538,000,000 Hz
538,000 kHz
DVBT 0.005 MHz5,000 Hz
5 kHz
0.005 MHz5,000 Hz
5 kHz
Worldwide except USA No Audio File DVB-T.PNG
Deltafix Deltafix is a DGPS system that is used to provide precision positioning used in the survey and oceanographic industry. 1.7 MHz1,700,000 Hz
1,700 kHz
3.4 MHz3,400,000 Hz
3,400 kHz
USB 2.5e-4 MHz250 Hz
0.25 kHz
2.5e-4 MHz250 Hz
0.25 kHz
Worldwide Deltafix.jpg
Digital Audio Broadcasting (DAB) A type of digital broadcast radio signal, containing multiple digital radio stations in the signal. 174.928 MHz174,928,000 Hz
174,928 kHz
1,490.625 MHz1,490,625,000 Hz
1,490,625 kHz
None 1.537 MHz1,537,000 Hz
1,537 kHz
1.537 MHz1,537,000 Hz
1,537 kHz
Worldwide DABthmb.jpg
Digital Audio Broadcasting + (DAB+) A type of digital broadcast radio signal, containing multiple digital radio stations in the signal. Here transmitted on channel 7D. 174 MHz174,000,000 Hz
174,000 kHz
1,492 MHz1,492,000,000 Hz
1,492,000 kHz
None 1.5 MHz1,500,000 Hz
1,500 kHz
1.5 MHz1,500,000 Hz
1,500 kHz
Worldwide No Audio File DAB.jpg
Digital Radio Mondiale (DRM) A form of international digital shortwave radio. A digital alternative to AM shortwave radio. 1 MHz1,000,000 Hz
1,000 kHz
22 MHz22,000,000 Hz
22,000 kHz
USB 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
Worldwide DRM Waterfallthmb.png
Digital SSTV Digital Slow Scan Television (SSTV). Used by hams to send images. Uses DRM to send images. 3 MHz3,000,000 Hz
3,000 kHz
300 MHz300,000,000 Hz
300,000 kHz
USB 0.0022 MHz2,200 Hz
2.2 kHz
0.0022 MHz2,200 Hz
2.2 kHz
Worldwide Digital sstvimg.jpg
Distress Radiobeacon (Analog) Distress Beacons emit a siren signal when activated, used for Search and Rescue teams to find the vessel or ship in distress. 121.5 MHz121,500,000 Hz
121,500 kHz
243 MHz243,000,000 Hz
243,000 kHz
USB 0.003 MHz3,000 Hz
3 kHz
0.003 MHz3,000 Hz
3 kHz
Worldwide SOS.jpg
Distributed Power Unit (DPU) Distributed power refers to the placing of an extra locomotive at an intermediate point in the middle section of a train. This locomotive unit is remotely controlled from the lead locomotive, and greatly increases both the pulling and stopping power of longer trains. 457.925 MHz457,925,000 Hz
457,925 kHz
457.925 MHz457,925,000 Hz
457,925 kHz
NFM 0 MHz0 Hz
0 kHz
0 MHz0 Hz
0 kHz
Seattle Distributed Power Unit (DPU)thmb.png
DominoEX DominoEX is an IFK (Incremental Frequency Keying) mode that aims to resolve issues that plague MFSK modes. Used to send text over radio. 0.3 MHz300,000 Hz
300 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 1.73e-4 MHz173 Hz
0.173 kHz
5.24e-4 MHz524 Hz
0.524 kHz
Worldwide DominoEx11.jpg
EDACS96 Radio trunking control channel. 860 MHz860,000,000 Hz
860,000 kHz
860 MHz860,000,000 Hz
860,000 kHz
NFM 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
Worldwide EDACS96 Waterfallthmb.png
End of Train (EOT) Transmits train telemetry such as brake status and accidental seperation information to the head locomotive. NFM Seattle EOT Waterfallthmb.png
European Radio Messaging System (ERMES) European Radio Message System (ERMES) is a European common standard for paging developed by the European Telecommunications Standards Institute (ESTI) 169 MHz169,000,000 Hz
169,000 kHz
170 MHz170,000,000 Hz
170,000 kHz
NFM 0.025 MHz25,000 Hz
25 kHz
0.025 MHz25,000 Hz
25 kHz
Europe Ermes desktopthmb.jpg
FLEX FLEX is a FSK digital pager protocol developed by Motorola. 169 MHz169,000,000 Hz
169,000 kHz
929 MHz929,000,000 Hz
929,000 kHz
NFM 0.005 MHz5,000 Hz
5 kHz
0.005 MHz5,000 Hz
5 kHz
Worldwide FLEX.jpg
FSK441 FSK441 is a high speed meteor scatter communication mode. FSK441 uses a baud rate of 441 Bd. 144 MHz144,000,000 Hz
144,000 kHz
444 MHz444,000,000 Hz
444,000 kHz
USB 0.00175 MHz1,750 Hz
1.75 kHz
0.00175 MHz1,750 Hz
1.75 kHz
Worldwide FSK441.jpg
FUNcube-1 Telemetry The Funcube-1 is a Cubesat amateur radio satellite. 145.935 MHz145,935,000 Hz
145,935 kHz
145.935 MHz145,935,000 Hz
145,935 kHz
USB 0.002 MHz2,000 Hz
2 kHz
0.002 MHz2,000 Hz
2 kHz
Worldwide Funcube1 Waterfallthmb.jpg
GMDSS Digital Selective Calling Global Maritime Distress and Safety System's digital selective calling system is a maritime communication protocol intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MF/HF radiotelex calls. 2.188 MHz2,187,500 Hz
2,187.5 kHz
16.805 MHz16,804,500 Hz
16,804.5 kHz
FSK 0.003 MHz3,000 Hz
3 kHz
0.003 MHz3,000 Hz
3 kHz
Worldwide Dsc waterfallthmb.jpg
GSM Downlink (Non-Hopping) GSM Cell Phone Downlink (Non Hopping Signal). Audio sample used NFM mode. 450 MHz450,000,000 Hz
450,000 kHz
1,800 MHz1,800,000,000 Hz
1,800,000 kHz
None 0.2 MHz200,000 Hz
200 kHz
0.2 MHz200,000 Hz
200 kHz
Worldwide GSMthmb.jpg
GSM Hopping GSM hopping cell phone signal. 450 MHz450,000,000 Hz
450,000 kHz
1,800 MHz1,800,000,000 Hz
1,800,000 kHz
None 0.2 MHz200,000 Hz
200 kHz
0.2 MHz200,000 Hz
200 kHz
Worldwide GSMHopping Waterfall.jpg
GSM Uplink Initial GSM connection sent from a cell phone. 450 MHz450,000,000 Hz
450,000 kHz
1,800 MHz1,800,000,000 Hz
1,800,000 kHz
None 0.2 MHz200,000 Hz
200 kHz
0.2 MHz200,000 Hz
200 kHz
Worldwide GSMUplink Waterfall.png
High Frequency Data Link (HFDL) An Aircraft Communications Addressing and Reporting System (ACARS) data link that aircraft use to communicate short messages over long distances using HF signals. 2.9 MHz2,900,000 Hz
2,900 kHz
22 MHz22,000,000 Hz
22,000 kHz
USB 0.0028 MHz2,800 Hz
2.8 kHz
0.0028 MHz2,800 Hz
2.8 kHz
Worldwide HFDL Waterfall.png
Hyperfix Hyperfix was a radio-navigation system developed by Racal. Was used by vessels and ships. Rapidly being phased out in favor of Differential GPS. 1.6 MHz1,600,000 Hz
1,600 kHz
3.4 MHz3,400,000 Hz
3,400 kHz
USB 2.5e-4 MHz250 Hz
0.25 kHz
2.5e-4 MHz250 Hz
0.25 kHz
Worldwide Hyperfix.jpg
ILS Marker Beacon Used by aircraft for Instrument Landing Systems, transmitted by an upward-facing directive antenna at known distances along the approach path. 75 MHz75,000,000 Hz
75,000 kHz
75 MHz75,000,000 Hz
75,000 kHz
AM 0.003 MHz3,000 Hz
3 kHz
0.003 MHz3,000 Hz
3 kHz
Worldwide 800px-LOM Waterfallthmb.png
ISM Band Power Meter A wireless electricity power monitor. 433 MHz433,000,000 Hz
433,000 kHz
433 MHz433,000,000 Hz
433,000 kHz
AM 0.02 MHz20,000 Hz
20 kHz
0.02 MHz20,000 Hz
20 kHz
Worldwide ISMBandPowerMeter Waterfallthmb.jpg
ISM Band Weather sensor Data returned from a consumer weather sensor using the AlectoV1 protocol. 433 MHz433,000,000 Hz
433,000 kHz
433 MHz433,000,000 Hz
433,000 kHz
AM 0.0044 MHz4,400 Hz
4.4 kHz
0.0044 MHz4,400 Hz
4.4 kHz
Worldwide Alecto wxthmb.png
Integrated Digital Enhanced Network (IDEN) A technology developed by Motorola. It is a type of trunked radio with cellular phone benefits. 854 MHz854,000,000 Hz
854,000 kHz
855 MHz855,000,000 Hz
855,000 kHz
NFM 0.0185 MHz18,500 Hz
18.5 kHz
0.0185 MHz18,500 Hz
18.5 kHz
Worldwide IDEN.jpg
Ionosonde An Ionosonde is a radar that examines the Ionosphere by sweeping the HF band and receiving the echos 1 MHz1,000,000 Hz
1,000 kHz
40 MHz40,000,000 Hz
40,000 kHz
USB 0 MHz0 Hz
0 kHz
0 MHz0 Hz
0 kHz
Worldwide Ionosondethumb.jpg
JT65a Amateur radio digital mode designed for HF use in limited power / high noise conditions. 10.137 MHz10,137,000 Hz
10,137 kHz
50.29 MHz50,290,000 Hz
50,290 kHz
USB 3.55e-4 MHz355 Hz
0.355 kHz
3.55e-4 MHz355 Hz
0.355 kHz
Worldwide JT65athmb.jpg
Japanese Slot Machine (XSL) Known as the Japanese Slot Machine. Thought to be data originating from the Japanese Navy. 3 MHz3,000,000 Hz
3,000 kHz
9 MHz9,000,000 Hz
9,000 kHz
USB 0.002 MHz2,000 Hz
2 kHz
0.002 MHz2,000 Hz
2 kHz
Japan Japslotmach.jpg
LTE Network Long Term Evolution Network. Also known as 4G LTE Data. Data service for wireless consumer devices. 700 MHz700,000,000 Hz
700,000 kHz
2,200 MHz2,200,000,000 Hz
2,200,000 kHz
None 9 MHz9,000,000 Hz
9,000 kHz
9 MHz9,000,000 Hz
9,000 kHz
Worldwide LTE Thumb.jpg
Link 11 Link 11 (Also known as STANAG 5511, TADIL-A, and MIL-STD-6011) is a Tactical Data Link standard (formerly known as Tactical Digital Information Link (TADIL) used by NATO and the US Military for Maritime Tactical Data Exchange. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
DSB 0.0025 MHz2,500 Hz
2.5 kHz
0.0025 MHz2,500 Hz
2.5 kHz
Europe/US TDLthmb.png
LoJack LoJack is a vehicle tracking system that allows vehicles to be tracked by police, with the aim of recovering them in case of theft via a small radio transceiver clandestinely installed in a vehicle. 173.075 MHz173,075,000 Hz
173,075 kHz
173.075 MHz173,075,000 Hz
173,075 kHz
NFM 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
USA LoJack Signalthmb.png
Logic Trunked Radio Control Control channel for a logic trunked radio system. 148 MHz148,000,000 Hz
148,000 kHz
170 MHz170,000,000 Hz
170,000 kHz
NFM 0.012 MHz12,000 Hz
12 kHz
0.012 MHz12,000 Hz
12 kHz
Worldwide LogicTrunkedRadio Waterfallthmb.jpg
MOBITEX A packet-switched data network used often by public safety. NFM? Worldwide Mobitexwaterfall.jpg
MPT1327 Radio trunking control channel. 420 MHz420,000,000 Hz
420,000 kHz
420 MHz420,000,000 Hz
420,000 kHz
NFM 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
Worldwide MPT1327 Waterfallthmb.png
Morse Code (CW) CW Morse Code is the simplest form of transmission found virtually all over the RF bands for a variety of uses. The most common use of this is for Call-sign Beacons by both Amateur and Military operators. 1 MHz1,000,000 Hz
1,000 kHz
930 MHz930,000,000 Hz
930,000 kHz
CW 0 MHz0 Hz
0 kHz
0 MHz0 Hz
0 kHz
Worldwide CW morse code.jpg
MotoTRBO Motorola digital voice protocol. 860 MHz860,000,000 Hz
860,000 kHz
860 MHz860,000,000 Hz
860,000 kHz
NFM 0.01 MHz10,000 Hz
10 kHz
0.01 MHz10,000 Hz
10 kHz
Worldwide DMRMOTOTRBO Waterfall.png
Motorola Type II Radio trunking control channel. 800 MHz800,000,000 Hz
800,000 kHz
960 MHz960,000,000 Hz
960,000 kHz
NFM 0.008 MHz8,000 Hz
8 kHz
0.008 MHz8,000 Hz
8 kHz
Worldwide Moto.jpg
Multi Frequency Shift Keying (MFSK) MFSK is a family of multi-frequency shift keying digital transmission modes. MFSK-8 and MFSK-16 are two well-known amateur radio modes. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 1.54e-4 MHz154 Hz
0.154 kHz
6.3e-4 MHz630 Hz
0.63 kHz
Worldwide MFSK 8 thmb.jpg
NFM Voice Used in analog walkie-talkies and communication systems. 27 MHz27,000,000 Hz
27,000 kHz
470 MHz470,000,000 Hz
470,000 kHz
NFM 0.005 MHz5,000 Hz
5 kHz
0.03 MHz30,000 Hz
30 kHz
Worldwide Nfm.jpg
Nexedge NXDN Trunking Radio trunking control channel. NFM Worldwide NXDNTrunking Waterfall.png
Nissan Car Key Wireless entry rolling code car key. 315 MHz315,000,000 Hz
315,000 kHz
433 MHz433,000,000 Hz
433,000 kHz
AM/FM 0.04 MHz40,000 Hz
40 kHz
0.04 MHz40,000 Hz
40 kHz
Worldwide NissanCarFob Waterfallthmb.png
Olivia OLIVIA MFSK is a digital teletype mode designed to work effectively in low SNR settings. It can also decode well under other noise, QSB, QRM, flutter caused by polar path propagation and even auroral conditions. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 1.25e-4 MHz125 Hz
0.125 kHz
0.002 MHz2,000 Hz
2 kHz
Worldwide Olivia.jpg
Orbcomm Orbcomm satellites are used for monitoring and sending short text messages. 137 MHz137,000,000 Hz
137,000 kHz
150 MHz150,000,000 Hz
150,000 kHz
NFM 0.015 MHz15,000 Hz
15 kHz
0.015 MHz15,000 Hz
15 kHz
Worldwide Orbcomm Waterfallthmb.jpg
Over the Horizon Radar (OTH) Used by militaries for very long range radar systems. 6 MHz6,000,000 Hz
6,000 kHz
18 MHz18,000,000 Hz
18,000 kHz
None 0.02 MHz20,000 Hz
20 kHz
0.02 MHz20,000 Hz
20 kHz
Worldwide OTH2.png
PACKET 300 The packet radio protocol is a derivative of the AX.25 and HDLC computer network protocols. Packet radio is a synchronous system in which data is transmitted in ASCII character packets. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 5.0e-4 MHz500 Hz
0.5 kHz
5.0e-4 MHz500 Hz
0.5 kHz
Worldwide PACKET300.jpg
PACTOR I PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQ. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 3.0e-4 MHz300 Hz
0.3 kHz
3.0e-4 MHz300 Hz
0.3 kHz
Worldwide PACTOR Addimg.jpg
PACTOR II PACTOR II is an advancement of PACTOR I. It is up to 8 times faster than PACTOR I. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 4.5e-4 MHz450 Hz
0.45 kHz
4.5e-4 MHz450 Hz
0.45 kHz
Worldwide PACTOR IIstd.jpg
PACTOR III PACTOR III is an data transmission mode that provides higher throughput and improved robustness compared to PACTOR I and II. PACTOR III is on average 3.5 times faster than PACTOR II. With optimal conditions, PACTOR III becomes over 5 times faster. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 4.0e-4 MHz400 Hz
0.4 kHz
0.0024 MHz2,400 Hz
2.4 kHz
Worldwide PACTORIIIthumb.jpg
PACTOR IV PACTOR IV is the newest iteration of the PACTOR series, advancing from PACTOR I-III. It is 1.5x-3x faster than PACTOR III, and has 10 speed levels. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 3.0e-4 MHz300 Hz
0.3 kHz
0.0024 MHz2,400 Hz
2.4 kHz
Worldwide PACTOR IV.jpg
PAL TV Analogue TV Signal. Now phased out in most of the world. 60 MHz60,000,000 Hz
60,000 kHz
60 MHz60,000,000 Hz
60,000 kHz
None 5 MHz5,000,000 Hz
5,000 kHz
5 MHz5,000,000 Hz
5,000 kHz
Worldwide 800px-PALTV Waterfallthmb.jpg
PLUTO II Radar Audio sample recorded in RAW mode. The signal is periodic. It can broadcast for several minutes, before going silent, and reappearing at another frequency. It has been seen in short bursts. 24.055 MHz24,055,000 Hz
24,055 kHz
26.37 MHz26,370,000 Hz
26,370 kHz
Unknown 0.02 MHz20,000 Hz
20 kHz
0.02 MHz20,000 Hz
20 kHz
Norway PLUTOthmb.png
POCSAG Pager digital signal. 35 MHz35,000,000 Hz
35,000 kHz
960 MHz960,000,000 Hz
960,000 kHz
NFM 0.009 MHz9,000 Hz
9 kHz
0.009 MHz9,000 Hz
9 kHz
Worldwide POCSAG Waterfallthmb.png
Phase Shift Keying (PSK) A digital teletype mode based on Phase-Shift Keying (PSK) modulation. The most popular amateur radio PSK mode is PSK 31. 1.838 MHz1,838,000 Hz
1,838 kHz
909 MHz909,000,000 Hz
909,000 kHz
USB 1.0e-5 MHz10 Hz
0.01 kHz
1.0e-3 MHz1,000 Hz
1 kHz
Worldwide BPSKthumb.png
Piccolo Piccolo is a MFSK system developed by the UK Foreign and Commonwealth Office (FCO) to communicate with foreign embassies and UK military stations around the world. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 1.8e-4 MHz180 Hz
0.18 kHz
3.0e-4 MHz300 Hz
0.3 kHz
UK/Worldwide Piccolo12.jpg
Police Idling Walkie Talkie Radio Signal I found out what Unknown 453 was, the one that I posted a few weeks ago, it is a police idling signal, apparently the police signal belongs to the remote SDR I was listening to, but I got my own SDR now. So yeah, it is an idling signal for a police walkie-talkie 453.6 MHz453,600,000 Hz
453,600 kHz
453.6 MHz453,600,000 Hz
453,600 kHz
NFM 0 MHz0 Hz
0 kHz
0 MHz0 Hz
0 kHz
Unknown Police idlingthmb.jpg
Portable Traffic Lights Signals sent from portable traffic lights that are often used at roadworks. 154.463 MHz154,463,000 Hz
154,463 kHz
154.463 MHz154,463,000 Hz
154,463 kHz
NFM 0 MHz0 Hz
0 kHz
0 MHz0 Hz
0 kHz
Worldwide PortTrafLight Waterfall.png
Project 25 (P25) Project 25 (P25 or APCO-25) is a trunked radio standard developed by The Association of Public Safety Communications Officials International (APCO-25) for use with public safety organizations around the world. 500 MHz500,000,000 Hz
500,000 kHz
860 MHz860,000,000 Hz
860,000 kHz
NFM 0.0125 MHz12,500 Hz
12.5 kHz
0.0125 MHz12,500 Hz
12.5 kHz
Worldwide P25.jpg
Pulse Coded Modulated (PCM) RC Toy Signal used for remote control (RC) Toys. 27.145 MHz27,145,000 Hz
27,145 kHz
49 MHz49,000,000 Hz
49,000 kHz
None 0 MHz0 Hz
0 kHz
0 MHz0 Hz
0 kHz
Worldwide PCMRCToy Waterfallwaterfall.png
RBU RBU is a time code radio station located in Moscow. It transmits a continuous 10 kW time code on 66.66 kHz. 0.0667 MHz66,660 Hz
66.66 kHz
0.0667 MHz66,660 Hz
66.66 kHz
USB 6.5e-4 MHz650 Hz
0.65 kHz
6.5e-4 MHz650 Hz
0.65 kHz
Moscow, Russia RBU.jpg
RDFT (Redundant Digital File Transfer) RDFT is an amateur radio digital mode used to transmit files. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
AM 0.0018 MHz1,800 Hz
1.8 kHz
0.0018 MHz1,800 Hz
1.8 kHz
Worldwide HM01 Waterfall2thmb.jpg
Radio Teletype (RTTY) Radio Teletype, also known as RTTY. 0.14 MHz140,000 Hz
140 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 8.5e-5 MHz85 Hz
0.085 kHz
8.5e-5 MHz85 Hz
0.085 kHz
Worldwide RTTYthmb.jpg
ReFLEX Two-way paging variant of FLEX. 896 MHz896,000,000 Hz
896,000 kHz
941 MHz941,000,000 Hz
941,000 kHz
NFM 0.04 MHz40,000 Hz
40 kHz
0.04 MHz40,000 Hz
40 kHz
USA ReFlexthumbnail.jpg
SITOR-A/SITOR-ARQ SITOR-A is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 3.5e-4 MHz350 Hz
0.35 kHz
3.5e-4 MHz350 Hz
0.35 kHz
Worldwide SITOR-A.jpg
SITOR-B/SITOR-FEC SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 3.5e-4 MHz350 Hz
0.35 kHz
3.5e-4 MHz350 Hz
0.35 kHz
Worldwide SITORB.jpg
STANAG 4285 Standardization Agreement (STANAG) 4285. NATO standard for HF communication. 1.89 MHz1,890,000 Hz
1,890 kHz
22.7 MHz22,700,000 Hz
22,700 kHz
USB 0.0025 MHz2,500 Hz
2.5 kHz
0.0025 MHz2,500 Hz
2.5 kHz
Worldwide Stanag4285 Waterfallthmb.png
Serdolik Serdolik (aka Crowd-36) is a MFSK signal mainly used by the Russian diplomatic service and military. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.0014 MHz1,400 Hz
1.4 kHz
0.0014 MHz1,400 Hz
1.4 kHz
Russia Crowd 36thmb.jpg
Signal Identification Guide
Slow-Scan Television (SSTV) Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. 3 MHz3,000,000 Hz
3,000 kHz
300 MHz300,000,000 Hz
300,000 kHz
USB 0.0025 MHz2,500 Hz
2.5 kHz
0.0025 MHz2,500 Hz
2.5 kHz
Worldwide Robot 36waterfall.jpg
Swedish POCSAG Minicall A short POCSAG 1200 signal used in electric plants and remote transformer and insulation stations. 161 MHz161,000,000 Hz
161,000 kHz
161 MHz161,000,000 Hz
161,000 kHz
NFM 0.02 MHz20,000 Hz
20 kHz
0.02 MHz20,000 Hz
20 kHz
Sweden SwedishMinicallPocsag Waterfall.png
Terrestrial Trunked Radio (TETRA) A professional mobile radio and two-way transceiver (walkie-talkie) specification 380 MHz380,000,000 Hz
380,000 kHz
430 MHz430,000,000 Hz
430,000 kHz
NFM 0.025 MHz25,000 Hz
25 kHz
0.025 MHz25,000 Hz
25 kHz
Europe TETRA Waterfallthmb.png
Tetrapol Digital communication system used by police and military in Europe. 370 MHz370,000,000 Hz
370,000 kHz
400 MHz400,000,000 Hz
400,000 kHz
NFM 0.0125 MHz12,500 Hz
12.5 kHz
0.0125 MHz12,500 Hz
12.5 kHz
Europe Tetrapolthmb.jpg
Tire Pressure Monitoring System (TPMS) Signal is from a Chrysler TPMS (Tire-Pressure Monitoring System) sensor. It was captured by using a known good sensor and forcing it to transmit by applying the required amount of G-force to wake it up. It was received using an RTL-SDR with no antenna in close proximity to the sensor. 315 MHz315,000,000 Hz
315,000 kHz
433 MHz433,000,000 Hz
433,000 kHz
AM Worldwide TPMSthmb.jpg
Toyota Car Key Wireless entry rolling code car key. 315 MHz315,000,000 Hz
315,000 kHz
433 MHz433,000,000 Hz
433,000 kHz
AM/FM 0.04 MHz40,000 Hz
40 kHz
0.04 MHz40,000 Hz
40 kHz
Worldwide ToyotaCarFob Waterfall.png
UTC (Coordinated Universal Time) Time Standard UTC (Coordinated Universal Time) time standard transmission from NIST (National Institute of Standards and Technology) stations WWV in Fort Collins, Colorado USA and WWVH in Kauai, Hawaii. 2.5 MHz2,500,000 Hz
2,500 kHz
25 MHz25,000,000 Hz
25,000 kHz
AM 0.004 MHz4,000 Hz
4 kHz
0.004 MHz4,000 Hz
4 kHz
USA UTC Image.jpg
Upper Sideband Voice Single side band, specifically upper side band. Used in the HF band by amateur radio hams and aircraft weather reports. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.0019 MHz1,900 Hz
1.9 kHz
0.0019 MHz1,900 Hz
1.9 kHz
Worldwide USB Waterfallthmb.png
VHF Data Link (VDL2) A modern version of ACARS. 136.975 MHz136,975,000 Hz
136,975 kHz
136.975 MHz136,975,000 Hz
136,975 kHz
NFM 0.025 MHz25,000 Hz
25 kHz
0.025 MHz25,000 Hz
25 kHz
Worldwide VDL2 Waterfallthmb.jpg
VHF omnidirectional range (VOR) A type of radio navigation system used by aircraft. 114.8 MHz114,800,000 Hz
114,800 kHz
114.8 MHz114,800,000 Hz
114,800 kHz
USB 0.021 MHz21,000 Hz
21 kHz
0.021 MHz21,000 Hz
21 kHz
Worldwide VOR signalthmb.png
Vaisala RS92SGP Weather Balloon (Radiosonde) Weather balloon (radiosonde) telemetry data. 400 MHz400,000,000 Hz
400,000 kHz
400 MHz400,000,000 Hz
400,000 kHz
NFM 0.0055 MHz5,500 Hz
5.5 kHz
0.0055 MHz5,500 Hz
5.5 kHz
Worldwide RS92SGP Waterfallthmb.png
Voice Frequency Telegraph (VFT) Consists of multiple RTTY channels over one audio bandwdith. 7.454 MHz7,453,500 Hz
7,453.5 kHz
7.454 MHz7,453,500 Hz
7,453.5 kHz
USB 0.003 MHz3,000 Hz
3 kHz
0.003 MHz3,000 Hz
3 kHz
Worldwide VFT.jpg
Weatherfax Weatherfax (Also known as Radiofax, HF Fax, and Weather Facsimile) primarily used worldwide for the dissemination of weather charts, satellite weather images, and forecasts to ships at sea. The oceans are covered by coastal stations in various countries. 3 MHz3,000,000 Hz
3,000 kHz
30 MHz30,000,000 Hz
30,000 kHz
USB 0.003 MHz3,000 Hz
3 kHz
0.003 MHz3,000 Hz
3 kHz
Worldwide Weather Fascimile.jpg
Wideband FM (WFM) Used for typical broadcast radio, and in some wireless headsets and speakers. 65 MHz65,000,000 Hz
65,000 kHz
108 MHz108,000,000 Hz
108,000 kHz
WFM 0.054 MHz54,000 Hz
54 kHz
0.054 MHz54,000 Hz
54 kHz
Worldwide Wideband FM.jpg
XM Satellite Radio XM Satellite Radio: Terrestrial Repeater Signal. 2,332.5 MHz2,332,500,000 Hz
2,332,500 kHz
2,345 MHz2,345,000,000 Hz
2,345,000 kHz
None 5 MHz5,000,000 Hz
5,000 kHz
5 MHz5,000,000 Hz
5,000 kHz
USA No Audio File XM sattelite radio.jpg

Requested Signals

If you have these signals (or any other not on the list) please either add the waterfall image and sample sound as an MP3 to the wiki and edit the page, or email me at rtlsdrblog__AT__gmail__DOT__com for addition. Please consult the instructions here - Adding An Example Signal.

 Description
CDMA
Emergency Managers Weather Information Network (EMWIN)
PACKET 1200
Voice Inversion Scrambling

Unidentified Signals

If you have an unidentified signal that you would like the wiki readers to take a look at please either email me at rtlsdrblog__at__gmail__dot__com or add it as a page yourself with the Category:UNID. 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 add the signal using the correct template so that it will show up properly on the main page. Please consult the instructions here - Adding An Example Signal.

If you happen to be able to identify a signal, please either edit the wiki, make a note in the wiki discussion page (in the signal page click the discussion tab at the top), or email me at rtlsdrblog__at__gmail__dot__com.

Comments

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


Anonymous user #1

291 days ago
Score 0+-
unknown 469 is a signal from wireless alarm monitoring services. Homes and businesses with alarm systems can have a wireless transmitter for backup or for locations without a phone line.

Anonymous user #2

291 days ago
Score 0+-
unknown 550 is most likely noise from the USB interface of a PC or noise from a monitor. I have seen a very similar signal and found it to be noise from the PC.

Anonymous user #3

282 days ago
Score 0+-

I'd like to put in a request for info and signal sample on RD-LAP and also on the Motorola MDT signals that preceded the 19.2 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.

Fusionimage

279 days ago
Score 0+-

'Unknown Lines' must be LTR Standard/LTR PassPort/LTR Net

I've submitted some samples to the admin, I think, he will put them here soon

Anonymous user #4

273 days ago
Score 0+-
Unknown chirping 2 I've been seeing something very similar on 936.924MHz USA Virginia.

Anonymous user #5

273 days ago
Score 0+-
Unknown Pager-Like is a variant of a FLEX pager.

Anonymous user #6

247 days ago
Score 0+-
Unknown Musical is JT65

Anonymous user #5

246 days ago
Score 0+-
Unknown Musical is JT65a.

Anonymous user #5

233 days ago
Score 0+-
How about a tutorial on how to "Tune In" to certain signals, when do you use LSD/USB what is "Shift" for CW ect.. I can't seem to find a good reference, but here it is very clear on how to process and recognise signals

Anonymous user #7

232 days ago
Score 0+-
Unknown 72 is a signal "BIIS1200" protocol.

Anonymous user #7

226 days ago
Score 0+-

Can someone confirm from this screenshot that it is encrypted voice I'm using DSD and i can partaily hear voices it sounds weird its hard to explain it i can definitely hear a voice but i'm unable to make out if it is male or female because the voice will go deep then soft very quickly so i'm unable to make out what is being said.

<a href="http://www.d...mqvtzh4j.png" target="_blank"><img src="http://www.d...4j_thumb.png" border="0" alt="Unknown155"/></a>

Anonymous user #7

222 days ago
Score 0+-
Unknown 409 is probably APRS / AFSK decodeable with http://sourc...ojects/qtmm/ at FM mode

Anonymous user #8

221 days ago
Score 0+-
Unknown ALE is an Over The Horizon Radar which emanates from Asia and can be heard on various HF bands and frequencies. It is quite common on the 40M amateur radio band in New Zealand amongst others.

Anonymous user #9

171 days ago
Score 0+-
That wasn't a radar!

Anonymous user #10

217 days ago
Score 0+-

Unknown 433

Could be a cheap home weather station. But 433 MHz is full of mystery signals for consumer electronics like alarm remotes and other sensors.

Trevmar

212 days ago
Score 1+-
I have added a page in the infamous Californian electricity "Smart Meter"

Anonymous user #7

211 days ago
Score 0+-
Unknown Trunking is probably TETRA

Anonymous user #11

203 days ago
Score 0+-
I am listening to an unknown signal on 13505 khz AM mode on 10-5-14 at 11:45 am EST which sounds something like a remote control when aimed at a radio(MW or LW). Pulses are short and seem to be "communicating" with each other(close and distant).

Anonymous user #5

196 days ago
Score 0+-
Unknown 15650 is Crowd-36 and Unknown 28p957 is a short-distance radar.

Anonymous user #12

184 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 #9

182 days ago
Score 0+-

I've found a russian program to analyze signals its name is: Signals Analyzer.

I don't know how to use it but i think that is an interesting program.

Anonymous user #9

171 days ago
Score 0+-
Where is the 8 FSK system?

Anonymous user #5

164 days ago
Score 0+-
Unknown 24 is an OTHR, specifically the PLUTO II radar.

Anonymous user #5

147 days ago
Score 0+-
The one by IN87RG might not be from his location, it is from the UOT WebSDR possibly.

Anonymous user #13

136 days ago
Score 0+-
FSK441 is missing, so is Olivia, Domino, etc..

Anonymous user #14

131 days ago
Score 0+-
Unknown 40!! I've heard it too.. there is usually something idling.. sometimes the transmission is longer.. one day there was two stations of it. here https://www....=GTIQnC3f5U0

Anonymous user #9

130 days ago
Score 0+-
My pc not detect sounds on this site, may help me please?

Anonymous user #9

128 days ago
Score 0+-
Unknown 155p6, signal from Turkey, Central Anatolia is APCO25 (P25) Signal.

Vic

123 days ago
Score 0+-
Unknown 72 can be decoded with MultiPSK: BIIS protocol (Binary Interchange of Information and Signaling)

Anonymous user #12

120 days ago
Score 0+-
I found Unknown chirping 2 at cca 447.7MHZ, multiple signals, Slovakia.

Anonymous user #5

114 days ago
Score 0+-
Can confirm "Unknown-1536125", hear it all the time on 462.407 MHz and 173.226 MHz.

Anonymous user #5

113 days ago
Score 0+-
Interesting...live anywhere in the Massachusetts, USA area by chance?

LargeVirus

113 days ago
Score 0+-
Original poster here, no, but I do live in Connecticut. New London County. The 173.226 MHz sounds like a time signal with an incomprehensible identification every 10 seconds, and the 462.407 MHz one sounds like a beacon.

Avsa242

112 days ago
Score 0+-
OP here. I don't know why I hadn't thought of this before, but I did a little Googling and found that the two VHF freq's are registered to an address of a town water supply. Street view shows two water tanks/towers at that address, so I'm guessing this is some sort of monitoring system. Saw your video- the waterfall looks similar, at least, to the one I posted, but it didn't sound to me like the same signal.

LargeVirus

106 days ago
Score 0+-
They all seem very different, yes. But I think they're all the same signal.

Anonymous user #5

114 days ago
Score 0+-
Unknown ionosonde-like is not an ionosonde, but it is a sounder. Specifically, the 29B6 Over The Horizon Radar sounder is pictured on the University of Twente WebSDR, it makes a paddling noise to check if a frequency is not in use. It isn't very effective since it commonly overlaps HAM bands and SW broadcast bands.

Anonymous user #5

105 days ago
Score 0+-
Thanks, i'll update it!

Anonymous user #15

114 days ago
Score 0+-

А это уважаемые товарищи идет канал видео ТВ. Где то рядом на 2 кгц ниже или выше идет звук.

http://www.s...wn_155p5.jpg

LargeVirus

95 days ago
Score 0+-
Unknown 148 is POCSAG. First is POCSAG 512, second is POCSAG 1200. Unknown 21p075 is OLIVIA, specifically, OLIVIA 8-250 in the audio file.

Anonymous user #16

94 days ago
Score 0+-
thanks friend

Anonymous user #12

93 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.

Zimbabwe490

92 days ago
Score 0+-
how u get 12 mhz bandwidth

Anonymous user #17

41 days ago
Score 0+-

@Zimbabwe490

I meant to say khz not mhz obviously.

LargeVirus

90 days ago
Score 1+-
Unknown Lines is logic trunked radio.

Anonymous user #9

86 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 #18

82 days ago
Score 0+-
Anyone have an EPIRB signal 406.025MHz, GPS EPIRB preferred.

Anonymous user #12

80 days ago
Score 0+-
When i turn on my LCD TV, i see a interference very similar to "Unknown 550"

Anonymous user #9

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

Please let me know if you need more.

Admin

62 days ago
Score 0+-
Thank you! This is a big list it might take some time to go through it though :)

Cartoonman

61 days ago
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I can extrapolate spectra for a good number of them (esp. the MFSK modulation types) from the audio when I have time. The rest can be placed into new pages or added to sections of pages (POCSAG 512, 1200, etc) for different modes of the same modulation.

Cartoonman

61 days ago
Score 0+-
also http://kb9ukd.com/digital/ is another good source of signals to add, anon user #12 posted it some months ago.

Anonymous user #15

57 days ago
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please do some waterfall images from this big collection of signals and add it to the database !

big thanks !

LargeVirus

67 days ago
Score 1+-
Unknown 432 - that is indeed morse code. What you have found is in the middle of the 70 cm band, it is a HAM transmitting his/her callsign, their callsign is VK4RBB.

Zimbabwe490

55 days ago
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can i ask why a morse code signal needs to devour so much bandwidth

Anonymous user #5

67 days ago
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Unknown 432 is an amateur radio beacon from VK4RBB SOUTHSIDE AMATEUR RADIO SOCIETY INC PO BOX 294 WOODRIDGE, QLD 4114

Australia

Anonymous user #9

58 days ago
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thanks Anonymous user #9 for this big list of sample signals.

make the sigidwiki the one and only place for signals !

Zimbabwe490

53 days ago
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thanks whoever updated my page i completely forgot about it rfl

Cartoonman

53 days ago
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General Question: I'm gauging whether to keep a waterfall-only approach to these articles or if including the spectrum (Like California Smart Meter, DVB-T, and Digital SSTV) above the waterfall as a single image is more preferred.

Waterfalls are easier to get than spectrums, but I have noticed that certain signals sorta need the spectrum as it's a defining characteristic to it's ID (e.g. ATSC and trunked radio signals).

Or, if this is a better idea, having two separate images; one for waterfall and one for spectrum. Thoughts? I don't want to change any more images till I get a clear consensus on this.

Admin

52 days ago
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I think it would be best to have two separate images. The spectrum doesn't really provide any useful info for most signals, and when it does it can be simply added as an additional image.

Cartoonman

51 days ago
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Thanks for the clarification. I'll go ahead with the waterfalls then, and add a spectrum as an additional image.

LargeVirus

48 days ago
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You, Cartoonman, I like you. Let's be friends. also, Unknown 155p47 is logic trunked radio.

Anonymous user #19

48 days ago
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Haha, thanks :) I have an OCD for neatness and accuracy. And thanks for the ID. Someone'll merge it into the LTR article, if I don't get to it before them.

Cartoonman

48 days ago
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/\ that was me. forgot to log in, as usual :)

LargeVirus

48 days ago
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Cool, any way I can talk to you like Steam or something? =P

Cartoonman

48 days ago
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Hmm my steam hasn't been used in like, months (Busy with life). Search for "Cartoonman". Here's your hint on which one is me: http://puu.s...2f36c02e.jpg

Admin

47 days ago
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So I made a few changes to the way caching works on the site. It should be faster for non-logged in users and users that don't anonymously edit the wiki. Let me know if there are any issues which logged in users and editing.

Aco

46 days ago
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Hi Cartoonman, thanks for your excelent work on this wiki. This will help sigidwiki and Artemis database. A big problem is the frequency and bandwidth forms because actually the concept of range is not entirely implemented. If you are interested to this problem, you are well accepted in the forum of Artemis tool (http://marks...fined-value/).

Thanks again for your help.

Anonymous user #9

46 days ago
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Hi

I am planning to capture a signal is called PD signal, whence I done it I will add it. but in case that I need help will any body help?

Cartoonman

46 days ago
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Of course, the admin and other users (like myself) could help you add the signal to the wiki.

Erbo

45 days ago
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Very nice wiki! very helpful! Unknown 40 is very weird.

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

LargeVirus1

44 days ago
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oops, forgot my passw.

Anonymous user #14

40 days ago
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Unknown 28p597 is IRAN Radar, OTH radar

Cartoonman

39 days ago
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Thanks! Do you happen to have a link or some source to verify? OTH's are hard to properly ID, so many different ones, and they don't tend to follow general rules.

All i could find was http://www.i...dar-2012.pdf, but their sample didnt sound like this; who knows, IRAN might have developed more than this since the article.

MikeAgner

38 days ago
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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 'AM/RDFT' as the mode

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

Cartoonman

37 days ago
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Hi Mike! Thanks for noting these mistakes!. As much as I try to verify the validity of a signal, its pretty hard research.

a. Yup, Crowd 36 (aka Serdolik) has been on my list of fixing. Feel free to edit it though, take it off my agenda :p

b. Wow, thanks for the clearing up. I did find it odd that I couldn't find much information on DIGTRX as a signal. RDFT is the actual signal i take it? I've had trouble finding details on it.

MikeAgner

38 days ago
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Oops - RDFT = Redundant Digital File Transfer...my bad...

MikeAgner

37 days ago
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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

Anonymous user #20

36 days ago
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Hi All,

I have sound signal file. Need input.

http://we.tl/Xg1xwkNqTK ( Location of file )

Cartoonman

36 days ago
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That seems like a harmonic, not an actual signal, or if it is, it's an idling channel. perhaps this is what you found? http://www.r...is_a_birdie/

Cartoonman

35 days ago
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On second analysis, that does seem to be a sort of data link. Looks curiously similar to the mystery 3x PSK signal, but it's not exact. I'm not sure what this signal is, I haven't seen it before.

Anonymous user #21

35 days ago
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Any other input or idea on how to figure out ?

Cartoonman

35 days ago
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If you can post the IQ file of this signal here, or on reddit.com/r/signalidentification/, then it will be possible that someone who has seen it before will identify it.

MikeAgner

35 days ago
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I'd be willing to fix the Serdolink,DIGTRX and HM01 articles, but (correctly), I can't touch the main page that they link from - so these new articles would be lost (orphans).

Suggestions? Mike

Cartoonman

35 days ago
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Oh lol, thats not a problem. What happens is, the main page actually gets automatically updated every 24 hours. The tag that makes a page appear on the main page is, so as long as that tag exists in the article, by the next server "re-syncing", the article will be placed on the main page.

This only comes into effect when moving the name of the page. for example, moving the page Serdolink to Serdolik. Things like changing the waterfall image, bandwidth, frequency, and description are all done as you do it by direct linking, no need to wait for a server re-sync.

Cartoonman

35 days ago
Score 0+-
oops, the tag is "Category:Signal". Articles (like ones I just moved a few minutes ago) will have their former entries on the home page removed, and the new entry with the "Category:Signal" tag placed back on the main page with their new name. I just moved Amateur Morse Code Beacon so you can take a look at that for an example.

MikeAgner

35 days ago
Score 0+-

OK let's say that I used the 'MOVE' tab to rename the Serdolink article to Serdolik. If the entry is then re-indexed, it appears that all the data that was associated with the old entry on the main page is lost (as the beacon article you just moved currently is). That's not a very good scenario.

In addition there are a number of incorrect frequency references on the main page that should be fixed. For example, there is a very specific set of frequencies that HFDL uses that is listed in a PDF file found in the article - the '2.9 Mhz,29 Mhz' listing is misleading since it reads like it could be just those frequencies, and that's simply not true. Another example includes those modes listed as '3 Mhz, 30 Mhz', and again, that's very misleading, since it leads a reader to think that those specific frequencies are used.

Mike

Anonymous user #22

35 days ago
Score 0+-

Yes that is correct, when the article is moved, all data that was in the old article's location is copied to the new article's location, and the main page's link to the data from the old article is broken. However, this is automatically resolved every 24 hours by the server, as the server resync's articles that have the "Category:Signal" tag, so what happens is, the old article that was truncated of data is removed from the main page, and the new article with the "Category:signal" tag is added to the main page. Sorta like a swap.

The frequency issue is a known thing that me, the admin, and developer of Artemis Aco are aware of. For the time being, the drive is going towards listing frequency range of where the signal exists instead of individual frequencies (since for many of these signals, they can appear at so many different frequencies that it would be pointless to list them all). The format of the site is due to undergo some changes to fit this push, so for the time being, I think that's the direction we're headed with the frequencies. Same goes for bandwidth, for signals that have a range of bandwidths.

Cartoonman

35 days ago
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/\ I wasn't logged in. this is me. oops lol.

MikeAgner

35 days ago
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What you could do in the case of the HFDL listing is to say something along the lines of 'See Article' in the 'Frequency' column, and let the article itself handle the link for the frequencies. They do change occasionally, and it's usually reported on the HFDL and/or UDXF Yahoo groups

As to the ham stuff - while there is some variation due to different regulations in other countries, amateur radio digital freqs are fairly restricted to certain parts of the bands, at least in the US. Examples of this include the 5 Mhz allocation the US shares with a few countries, but not everyone worldwide has access there. Another one is the 70 Mhz band allocated in the UK, but not in the US.

This website has a basic bandplan, along with the new 5 Mhz allocations that were changed just recently...

http://www.a...-allocations

and this one lists a ton of amateur modes and where they can be found. Again, it's not necessarily complete, but it's far better than just saying '3 Mhz, 30 Mhz' or some such...

http://bandp...php?band=All

Perhaps these links could be put in the writeup at the top of the page, then for each of the amateur mode listings, for the HF frequencies, point the reader to these.

Mike

Anonymous user #22

35 days ago
Score 0+-

You make a very good point; for most cases these frequencies are confined to amateur bands designated by regulations.

I think your idea is great, putting these links under the Frequencies section. You may have to figure out all the little intricacies of different region's band allocations though.


For signals that aren't solely amateur though, especially ones like ALE or OTH that are extremely erratic, or even ionosondes, listing the range that they are found at in the way I mentioned above in my previous comment /\ is, to me, the best way of defining their 'frequency'.

Cartoonman

35 days ago
Score 0+-
/\ I wasn't logged in. this is me. oops lol.

Cartoonman

35 days ago
Score 0+-
The only little problem that can come up, and this is subject to debate since I'm not an expert in Ham Radio, but individual frequencies of where these signals can be found could potentially change as time goes on, so they will require consistent updating, either by the site owners linked, or by users on this site.

Cartoonman

35 days ago
Score 0+-
Also, just for the record, http://qrg.globaltuners.com/ <- they have done an outstanding job with categorizing signals found at specific frequencies that are even geolocated. Perhaps we could point users to use their database when looking for specific frequencies of certain signals.

MikeAgner

35 days ago
Score 0+-

Ham radio frequencies tend not to move a whole lot - yes there are regulatory changes from time to time, but the basic ranges - which that 2nd article would be quite useful for, in the case of HF frequencies - remain pretty much unchanged for quite a while. If the frequency ranges were in the article rather than the main page, it would be a snap to fix.

The problem I see here is one of interpretation - if someone who is new sees something that says '3 Mhz, 30 Mhz', then they might think those 2 specific frequencies are the ones to check, when in fact that's incorrect.

What I might suggest for clarity is to say 'Any HF 3-30 Mhz' which is somewhat better.

For those modes that aren't ham-related nor broadcast-related, (or higher than 30 Mhz), the Utility DXers Forum Yahoo group is really the place to check for things like this. It's a very active group and has LOTS of digital stuff reported very frequently

Mike

Cartoonman

35 days ago
Score 0+-

Yup, the 3 Mhz , 30 Mhz is due to be dealt with soon. The admin will figure out how to go about fixing it so that it can display ranges.

I haven't visited the forum before, I'll give it a go, thanks!

MikeAgner

35 days ago
Score 0+-

ok I MOVEd Serdolink to Serdolik. Let's see if the server catches up in a day or two

Mike

MikeAgner

34 days ago
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OK this a bit more of a thorny problem. There are 2 articles - 'Cuban Numbers Station HM01' and 'DIGTRX' which basically describe the same thing. I can convert one article, but the other is unnecessarily redundant and not needed.

The first question is the reference that should be used- since many of the HF data listed on this page are named by their mode, I would suggest which ever page is to be created would be called RDFT

The next question is which article should be converted? Which ever one I convert, there will still be the other which is unneeded. Mike

Cartoonman

34 days ago
Score 0+-

Pick whichever one you feel would be the least work in redoing. I'll handling the article merging for the other article.

Do try to keep as much content that's relevant as possible in the article, (like, for example, leave the DIGITRX waterfall and sound sample and list it as one example of RDFT in a section). Discarding precious information means more time putting it back in later :p. And details are always a plus.

MikeAgner

33 days ago
Score 0+-
OK I'll tackle this tomorrow eve...Mike

Anonymous user #23

33 days ago
Score 0+-
All the signals described here seem to center on one frequency, or on a small set of frequencies. I frequently hear an HF signal, usually on 40m, that consists of digital "noise", rather loud, that either increases or decreases frequency very slowly (maybe by one to ten Hz per second). It never seems to interfere with amateur QSOs, maybe because it doesn't stay on one frequency for long. I can't determine the modulation mode just by listening to the audio. -- David Spector, Southern Maine, USA.

Cartoonman

32 days ago
Score 0+-

would they possibly be something like this? :

http://i.imgur.com/0OMkRqJ.jpg

Of course not to this degree, but something like it. Odd spurrs and things. Some call them "worms". Not sure exactly what causes them.

Cartoonman

32 days ago
Score 0+-
I'd say some are most likely ionosondes of some sort, or HF radars or testing signals.

Cartoonman

32 days ago
Score 0+-
There are also, and I've seen these on the websdr at Univ. of Twente, lots of freq hopping blips, that im sure are coming from radars or research transmitters. Those are a bit harder to categorize, since documentation on them may be sparse to non-existant, and tracking them may even be harder

MikeAgner

33 days ago
Score 0+-

All right, I did the move of the Cuban article, rewrote it, combining the DIGTRX article and the data I had - the move didn't take. No new entry was posted on the main page; however there is a redirect from the Cuban link to the RDFT article.

Something got hosed here...but what?

Thanks...Mike

Cartoonman

32 days ago
Score 0+-

The move did take. The homepage, as stated before, does not update in real time. It takes a day (about 3-6am EST is when the sync happens from my estimates) for the homepage to update. I checked the logs and you moved the Cuban page to RDFT, as stated.

In about a day, the old Cuban link will be removed, and RDFT will be added to the home page in it's place, assuming you kept the "Category:Signal" tag in the article.

Notice that an article I'm currently working on, SSTV (Slow-Scan Television) is not on the home page, despite being made. Without the Signal tag, it will not be read by the server to be added to the main page.

Cartoonman

32 days ago
Score 0+-

You can see the server's activity "log" here: http://www.s...ecentChanges

I use this all the time to make sure changes I made went through, as well as to keep track of changes made to articles made by other users, in case of a need to fix them up or move them around.

MikeAgner

32 days ago
Score 0+-

For the Olivia article, you can find samples and screenshots on these 2 webpages;

http://www.o...iviaView.htm

http://www.w...es/index.htm

Click on 'Olivia' from the left frame

Cartoonman

31 days ago
Score 0+-
Haha, thanks! I actually saw the second one. I plan on spending a lot of time with fldigi to make waterfalls for these modes. Its what i've been looking for to use for MFSK. I'm still debating how I will organize this large collection of signal modes, since in reality, only a handful are used with any frequency (PSK31, MFSK16, etc)

Cartoonman

31 days ago
Score 0+-
If you have any ideas, shoot em my way.

Admin

31 days ago
Score 1+-

Hi Guys,

Just letting you know that we'll be making changes to the wiki over the next few days to add some features like forms (so users who don't know wiki syntax can add a signal easily), and to implement things like frequency ranges on the main page for Artemis etc. So during this time the wiki might look a little broken. You can still add information to the wiki, but just be aware that the main template will be changing soon. When its done i'll make sure all the pages are updated and cleaned up.

Admin

19 days ago
Score 1+-
Just a quick update. Most of the changes are almost done, and the front page should be back to normal operation soonish too.

MikeAgner

30 days ago
Score 0+-

Cartoonman - there are a lot of screenshots and audio samples of MFSK stuff on the fldigi site as well - just pick that from the left panel.

If you're up for fixing the main page along with the upgrades, I'd like to send you a list - there's a fair amount of misunderstandings and stuff that's just wrong - but it's way too much to put on a simple text messenger like this. To where should I send it?

Mike

MikeAgner

30 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

Cartoonman

30 days ago
Score 0+-

Yup. The screenshots on the site are sorta too small for this website, and not the best resolution. I have a method of extracting spectra from audio, so it's not a problem.

Ooo, if you have fixes, you can put em in my talk page here: http://www.s...k:Cartoonman

And thanks for that link! I haven't seen this before but I have taken a look at some of the links they have.

When I wrote these articles, the main goal was primarily to get the signal up on the site (properly ID'd as much as I could verify), and put some information I found with it. Fact checking would simply take too much time and would end up with even slower submissions of signals than I am currently doing now. I would love to have other users write up factually correct and accurate descriptions for these signals, as it frees up my time to focus on IDing and adding signals, including getting good audio samples and waterfall images. A lot of my time is spent just trying to verify if the signal I have is what I think it is.

Cartoonman

30 days ago
Score 0+-
Btw, this isn't to say I don't fact check at all, I do fact check, but understand that I commonly find conflicting sources on information for these signals so it becomes a rather involved task sifting through misinformation; its inevitable that some will get through.

Anonymous user #11

14 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 RX 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

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

Admin

4 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.
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