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

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 "Kontainer"). 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 13,000 Hz13 kHz
0.013 MHz
Russia No Audio File [[Image:|150x250px]]
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
USB 9,000 Hz9 kHz
0.009 MHz
Worldwide No Audio File [[Image:|150x250px]]
ATSC Broadcast Advanced Television Systems Committee Television. 8VSB Modulation USB 6,000,000 Hz6,000 kHz
6 MHz
Worldwide No Audio File [[Image:|150x250px]]
Aircraft Communications Addressing and Reporting System (ACARS) Short messages sent to and from aircraft. USB 5,000 Hz5 kHz
0.005 MHz
Worldwide No Audio File [[Image:|150x250px]]
Amplitude Modulation (AM) Long range commercial broadcast and international radio. Also used for aviation communications. USB 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 12,500 Hz12.5 kHz
0.0125 MHz
UK No Audio File [[Image:|150x250px]]
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. USB 50,000 Hz50 kHz
0.05 MHz
Worldwide No Audio File [[Image:|150x250px]]
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
USB 25,000 Hz25 kHz
0.025 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 2,000 Hz2 kHz
0.002 MHz
Worldwide No Audio File [[Image:|150x250px]]
Automatic Link Establishment (3G ALE) 3G ALE is the next generation of ALE (Designated by MIL-188-141B (Appendix C)). USB 3,000 Hz3 kHz
0.003 MHz
Worldwide No Audio File [[Image:|150x250px]]
Automatic Packet Reporting System (APRS) Packet system for real time data communications. Used by hams for location reporting, weather stations etc. USB 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
Automatic Picture Transmission (APT) Used to by the NOAA weather satellites and some Russian weather satellites to transmit satellite weather photos. USB 30,000 Hz30 kHz
0.03 MHz
Worldwide No Audio File [[Image:|150x250px]]
Baby Monitor Wireless baby monitors often transmit NFM audio in the clear. 40 MHz40,000,000 Hz
40,000 kHz
, 49.5 MHz49,500,000 Hz
49,500 kHz
, 50 MHz50,000,000 Hz
50,000 kHz
, 27 MHz27,000,000 Hz
27,000 kHz
, 864 MHz864,000,000 Hz
864,000 kHz
USB 15,000 Hz15 kHz
0.015 MHz
Worldwide No Audio File [[Image:|150x250px]]
Binary Interchange of Information and Signaling (BIIS) European Trunked Radio Standard, 1200 bps. Can transmit both voice and data USB 2,000 Hz2 kHz
0.002 MHz
Europe No Audio File [[Image:|150x250px]]
CHX200 CHX200 (Also known as PRC-921/GY) is a backpack HF ECCOM transceiver, designed and built by Siemens. USB 300 Hz0.3 kHz
3.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
CIS-11 CIS-11 is a radio duplex teleprinter system used by Russian meteorological stations. CIS-11 is also known as TORG-11. USB 800 Hz0.8 kHz
8.0e-4 MHz
Russia No Audio File [[Image:|150x250px]]
CIS-12 CIS-12 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. USB 3,100 Hz3.1 kHz
0.0031 MHz
Russia No Audio File [[Image:|150x250px]]
CIS-14 Also known as AMOR and AMOR96. Synchronous FSK duplex teleprinter system with ARQ. USB 800 Hz0.8 kHz
8.0e-4 MHz
Russia No Audio File [[Image:|150x250px]]
CIS-16 Also known as CIS 16x75 Bd, CIS-16 is a MPSK-16 data system using Binary PSK. USB 2,700 Hz2.7 kHz
0.0027 MHz
Russia No Audio File [[Image:|150x250px]]
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. USB 3,400 Hz3.4 kHz
0.0034 MHz
Russia No Audio File [[Image:|150x250px]]
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. USB 2,000 Hz2 kHz
0.002 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 500 Hz0.5 kHz
5.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
CODAR Coastal Ocean Dynamics Applications Radar 3 MHz3,000,000 Hz
3,000 kHz
, 50 MHz50,000,000 Hz
50,000 kHz
USB 50,000 Hz50 kHz
0.05 MHz
Worldwide No Audio File [[Image:|150x250px]]
CW Morse Code 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. USB 0 Hz0 kHz
0 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 15,000 Hz15 kHz
0.015 MHz
USA No Audio File [[Image:|150x250px]]
Chinese 4+4 Chinese 4+4 is a multi-carrier transmission mode. It consists of 8 DQPSK carriers. They are 300 Hz apart, execpt the 4th and 5th carriers, which are 450 Hz apart from each other. USB 2,500 Hz2.5 kHz
0.0025 MHz
China No Audio File [[Image:|150x250px]]
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. USB 400 Hz0.4 kHz
4.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
Coquelet MFSK system, similar to Piccolo. Uses ITA-2 charset. It's two main modes are Coquelet-8 and Coquelet-13. USB 300 Hz0.3 kHz
3.0e-4 MHz
Europe No Audio File [[Image:|150x250px]]
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
USB 6,250 Hz6.25 kHz
0.00625 MHz
Worldwide No Audio File [[Image:|150x250px]]
DVB-T A DVB-T signal, received on a HackRF. USB 5,000 Hz5 kHz
0.005 MHz
Worldwide except USA No Audio File [[Image:|150x250px]]
Deltafix Deltafix is a DGPS system that is used to provide precision positioning used in the survey and oceanographic industry. USB 250 Hz0.25 kHz
2.5e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
Digital Audio Broadcasting (DAB) A type of digital broadcast radio signal, containing multiple digital radio stations in the signal. 239.2 MHz239,200,000 Hz
239,200 kHz
, 174.928 MHz174,928,000 Hz
174,928 kHz
, 1,452.96 MHz1,452,960,000 Hz
1,452,960 kHz
, 1,490.625 MHz1,490,625,000 Hz
1,490,625 kHz
USB 1,537,000 Hz1,537 kHz
1.537 MHz
Worldwide No Audio File [[Image:|150x250px]]
Digital Audio Broadcasting + (DAB+) A type of digital broadcast radio signal, containing multiple digital radio stations in the signal. Here transmitted on channel 7D. USB 1,500,000 Hz1,500 kHz
1.5 MHz
Worldwide No Audio File [[Image:|150x250px]]
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 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
Digital SSTV Digital Slow Scan Television (SSTV). Used by hams to send images. Uses DRM to send images. USB 2,200 Hz2.2 kHz
0.0022 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 3,000 Hz3 kHz
0.003 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 0 Hz0 kHz
0 MHz
Seattle No Audio File [[Image:|150x250px]]
DominoEX DominoEX is an IFK (Incremental Frequency Keying) mode that aims to resolve issues that plague MFSK modes. Used to send text over radio. USB 173 Hz0.173 kHz
1.73e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
EDACS96 Radio trunking control channel. 860 MHz860,000,000 Hz
860,000 kHz
USB 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
End of Train (EOT) Transmits train telemetry such as brake status and accidental seperation information to the head locomotive. USB 0 Hz0 kHz
0 MHz
Seattle No Audio File [[Image:|150x250px]]
European Radio Messaging System (ERMES) A European radio paging system. USB 0 Hz0 kHz
0 MHz
Europe No Audio File [[Image:|150x250px]]
FLEX Pager digital signal. USB 5,000 Hz5 kHz
0.005 MHz
Worldwide No Audio File [[Image:|150x250px]]
FSK441 FSK441 is a high speed meteor scatter communication mode. FSK441 uses a baud rate of 441 Bd. USB 1,750 Hz1.75 kHz
0.00175 MHz
Worldwide No Audio File [[Image:|150x250px]]
FUNcube-1 Telemetry The Funcube-1 is a Cubesat amateur radio satellite. 145.935 MHz145,935,000 Hz
145,935 kHz
USB 2,000 Hz2 kHz
0.002 MHz
Worldwide No Audio File [[Image:|150x250px]]
GMDSS Digital Selective Calling USB 3,000 Hz3 kHz
0.003 MHz
Worldwide No Audio File [[Image:|150x250px]]
GSM Downlink (Non-Hopping) GSM Cell Phone Downlink (Non Hopping Signal). Audio sample used NFM mode. USB 200,000 Hz200 kHz
0.2 MHz
Worldwide No Audio File [[Image:|150x250px]]
GSM Hopping GSM hopping cell phone signal. USB 200,000 Hz200 kHz
0.2 MHz
Worldwide No Audio File [[Image:|150x250px]]
GSM Uplink Initial GSM connection sent from a cell phone. USB 200,000 Hz200 kHz
0.2 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 2,800 Hz2.8 kHz
0.0028 MHz
Worldwide No Audio File [[Image:|150x250px]]
Hyperfix Hyperfix is a radio-navigation system developed by Racal. Used by vessels and ships. USB 250 Hz0.25 kHz
2.5e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
ILS Marker Beacon Used by aircraft for Instrument Landing Systems, transmitted by an upward-facing directive antenna at known distances along the approach path. USB 3,000 Hz3 kHz
0.003 MHz
Worldwide No Audio File [[Image:|150x250px]]
ISM Band Power Meter A wireless electricity power monitor. 433 MHz433,000,000 Hz
433,000 kHz
USB 20,000 Hz20 kHz
0.02 MHz
Worldwide No Audio File [[Image:|150x250px]]
ISM Band Weather sensor Data returned from a consumer weather sensor using the AlectoV1 protocol. USB 4,400 Hz4.4 kHz
0.0044 MHz
Worldwide No Audio File [[Image:|150x250px]]
Integrated Digital Enhanced Network (IDEN) A technology developed by Motorola. It is a type of trunked radio with cellular phone benefits. USB 18,500 Hz18.5 kHz
0.0185 MHz
Worldwide No Audio File [[Image:|150x250px]]
Ionosonde An Ionosonde is a radar that examines the Ionosphere by sweeping the HF band and receiving the echos USB 0 Hz0 kHz
0 MHz
Worldwide No Audio File [[Image:|150x250px]]
JT65a USB 355 Hz0.355 kHz
3.55e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
Japanese Slot Machine (XSL) Known as the Japanese Slot Machine. Thought to be data originating from the Japanese Navy. USB 2,000 Hz2 kHz
0.002 MHz
Japan No Audio File [[Image:|150x250px]]
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
, 900 MHz900,000,000 Hz
900,000 kHz
, 1,400 MHz1,400,000,000 Hz
1,400,000 kHz
, 1,600 MHz1,600,000,000 Hz
1,600,000 kHz
, 1,700 MHz1,700,000,000 Hz
1,700,000 kHz
, 2,200 MHz2,200,000,000 Hz
2,200,000 kHz
USB 9,000,000 Hz9,000 kHz
9 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 2,500 Hz2.5 kHz
0.0025 MHz
Europe/US No Audio File [[Image:|150x250px]]
Logic Trunked Radio Control Control channel for a logic trunked radio system. USB 12,000 Hz12 kHz
0.012 MHz
Worldwide No Audio File [[Image:|150x250px]]
MOBITEX A packet-switched data network used often by public safety. USB Worldwide No Audio File [[Image:|150x250px]]
MPT1327 Radio trunking control channel. 420 MHz420,000,000 Hz
420,000 kHz
USB 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
MotoTRBO Motorola digital voice protocol. 860 MHz860,000,000 Hz
860,000 kHz
USB 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
Motorola Type II Radio trunking control channel. USB 8,000 Hz8 kHz
0.008 MHz
Worldwide No Audio File [[Image:|150x250px]]
NFM Voice Used in analog walkie-talkies and communication systems. USB 10,000 Hz10 kHz
0.01 MHz
Worldwide No Audio File [[Image:|150x250px]]
Nexedge NXDN Trunking Radio trunking control channel. 171.3 MHz171,300,000 Hz
171,300 kHz
USB 8,000 Hz8 kHz
0.008 MHz
Worldwide No Audio File [[Image:|150x250px]]
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
USB 40,000 Hz40 kHz
0.04 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 500 Hz0.5 kHz
5.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
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
USB 15,000 Hz15 kHz
0.015 MHz
Worldwide No Audio File [[Image:|150x250px]]
Over the Horizon Radar (OTH) Used by militaries for very long range radar systems. USB 20,000 Hz20 kHz
0.02 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 500 Hz0.5 kHz
5.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
PACTOR I PACTOR-I is a digital data protocol combining elements of PACKET and AMTOR ARQ. USB 300 Hz0.3 kHz
3.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
PACTOR II PACTOR II is an advancement of PACTOR I. It is up to 8 times faster than PACTOR I. USB 450 Hz0.45 kHz
4.5e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 400 Hz0.4 kHz
4.0e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 2,400 Hz2.4 kHz
0.0024 MHz
Worldwide No Audio File [[Image:|150x250px]]
PAL TV Analogue TV Signal. Now phased out in most of the world. USB 5,000,000 Hz5,000 kHz
5 MHz
Worldwide No Audio File [[Image:|150x250px]]
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
, 25 MHz25,000,000 Hz
25,000 kHz
, 25.37 MHz25,370,000 Hz
25,370 kHz
, 26.37 MHz26,370,000 Hz
26,370 kHz
USB 20,000 Hz20 kHz
0.02 MHz
Norway No Audio File [[Image:|150x250px]]
POCSAG Pager digital signal. USB 9,000 Hz9 kHz
0.009 MHz
Worldwide No Audio File [[Image:|150x250px]]
Phase Shift Keying (PSK31) A digital amateur radio mode based on Phase-Shift Keying (PSK) modulation. 7.035 MHz7,035,000 Hz
7,035 kHz
, 7.04 MHz7,040,000 Hz
7,040 kHz
, 10.142 MHz10,142,000 Hz
10,142 kHz
, 14.07 MHz14,070,000 Hz
14,070 kHz
, 21.08 MHz21,080,000 Hz
21,080 kHz
, 50.29 MHz50,290,000 Hz
50,290 kHz
, 144.144 MHz144,144,000 Hz
144,144 kHz
, 222.07 MHz222,070,000 Hz
222,070 kHz
, 432.2 MHz432,200,000 Hz
432,200 kHz
, 909 MHz909,000,000 Hz
909,000 kHz
, 1.838 MHz1,838,000 Hz
1,838 kHz
, 3.58 MHz3,580,000 Hz
3,580 kHz
, 18.1 MHz18,100,000 Hz
18,100 kHz
, 24.92 MHz24,920,000 Hz
24,920 kHz
, 28.12 MHz28,120,000 Hz
28,120 kHz
USB 50 Hz0.05 kHz
5.0e-5 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. USB 180 Hz0.18 kHz
1.8e-4 MHz
UK/Worldwide No Audio File [[Image:|150x250px]]
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 USB 0 Hz0 kHz
0 MHz
Unknown No Audio File [[Image:|150x250px]]
Portable Traffic Lights Signals sent from portable traffic lights that are often used at roadworks. 154.463 MHz154,463,000 Hz
154,463 kHz
USB 0 Hz0 kHz
0 MHz
Worldwide No Audio File [[Image:|150x250px]]
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. 860 MHz860,000,000 Hz
860,000 kHz
, 500 MHz500,000,000 Hz
500,000 kHz
USB 12,500 Hz12.5 kHz
0.0125 MHz
Worldwide No Audio File [[Image:|150x250px]]
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
USB 0 Hz0 kHz
0 MHz
Worldwide No Audio File [[Image:|150x250px]]
RBU RBU is a time code radio station located in Moscow. It transmits a continuous 10 kW time code on 66⅔ kHz. USB 650 Hz0.65 kHz
6.5e-4 MHz
Moscow, Russia No Audio File [[Image:|150x250px]]
RDFT (Redundant Digital File Transfer) RDFT is an amateur radio digital mode used to transmit files. USB 1,800 Hz1.8 kHz
0.0018 MHz
Worldwide No Audio File [[Image:|150x250px]]
Radio Teletype (RTTY) Radio Teletype, also known as RTTY. USB, LSB 450 Hz0.45 kHz
4.5e-4 MHz
, 85 Hz0.085 kHz
8.5e-5 MHz
Worldwide No Audio File [[Image:|150x250px]]
ReFLEX Two-way paging variant of FLEX. 896 MHz896,000,000 Hz
896,000 kHz
, 902 MHz902,000,000 Hz
902,000 kHz
, 929 MHz929,000,000 Hz
929,000 kHz
, 932 MHz932,000,000 Hz
932,000 kHz
, 940 MHz940,000,000 Hz
940,000 kHz
, 941 MHz941,000,000 Hz
941,000 kHz
USB 40,000 Hz40 kHz
0.04 MHz
USA No Audio File [[Image:|150x250px]]
SITOR-A/SITOR-ARQ SITOR-A is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. It was formerly used to transmit maritime short messages, however the maritime industry is gradually moving away from using this mode in favor of PACTOR. USB 350 Hz0.35 kHz
3.5e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
SITOR-B/SITOR-FEC SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). NAVTEX and AMTOR-FEC/AMTOR-B uses the SITOR-B protocol. USB 350 Hz0.35 kHz
3.5e-4 MHz
Worldwide No Audio File [[Image:|150x250px]]
SSTV - Martin Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. SSTV Martin was developed by Martin Emmerson, and was originally included as a ROM enhancement for Robot Research's SSTV units. USB 2,500 Hz2.5 kHz
0.0025 MHz
Worldwide No Audio File [[Image:|150x250px]]
SSTV - Robot Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. SSTV Robot was developed by Robot Research Corporation. Used to send images over HF and VHF frequencies. USB 2,500 Hz2.5 kHz
0.0025 MHz
Worldwide No Audio File [[Image:|150x250px]]
SSTV - Scottie Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. SSTV Scottie was developed by Eddie Murphy GM3BSC, and was originally included as a ROM enhancement for Robot Research's SSTV units. USB 2,500 Hz2.5 kHz
0.0025 MHz
Worldwide No Audio File [[Image:|150x250px]]
STANAG 4285 Standardization Agreement (STANAG) 4285. NATO standard for HF communication. USB 2,500 Hz2.5 kHz
0.0025 MHz
Worldwide No Audio File [[Image:|150x250px]]
Sample signal 1 USB 100 Hz0.1 kHz
1.0e-4 MHz
, 500 Hz0.5 kHz
5.0e-4 MHz
Russia No Audio File [[Image:|150x250px]]
Serdolik Serdolik (aka Crowd-36) is a MFSK signal mainly used by the Russian diplomatic service and military. USB 1,400 Hz1.4 kHz
0.0014 MHz
Russia No Audio File [[Image:|150x250px]]
Signal Identification Guide No Audio File [[Image:|150x250px]]
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
USB 20,000 Hz20 kHz
0.02 MHz
Sweden No Audio File [[Image:|150x250px]]
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
USB 25,000 Hz25 kHz
0.025 MHz
Europe No Audio File [[Image:|150x250px]]
Tetrapol Digital communication system used by police and military in Europe. USB 12,500 Hz12.5 kHz
0.0125 MHz
Europe No Audio File [[Image:|150x250px]]
… further results

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)
Multi Frequency Shift Keying (MFSK)
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.


Signal Type Description Frequency Mode Bandwidth Location Sample Audio Waterfall Image
ADN-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 MHz800,000,000 Hz
800,000 kHz
, 900 MHz900,000,000 Hz
900,000 kHz
, 856 MHz856,000,000 Hz
856,000 kHz
NFM Portugal No Audio File Waterfall.png
Beeper 403.959 MHz403,959,000 Hz
403,959 kHz
FM 1,000 Hz1 kHz
1.0e-3 MHz
Australia Beeper.png
Unknown 142p398 Posting a unidendified sound. Sound like a MotoTrbo but chopped. Frequency hopping? 142.399 MHz142,398,825 Hz
142,398.825 kHz
NFM 8,000 Hz8 kHz
0.008 MHz
Drammen, Norway Unknown 142p398.jpg
Unknown 151 Carrier repeats every 4 seconds, signal every 5 seconds. Received in New London County. 151.195 MHz151,195,000 Hz
151,195 kHz
NFM 6,000 Hz6 kHz
0.006 MHz
Connecticut, USA Unknownsignal1.png
Unknown 155p47 I found this unknown signal at 155.470 Mhz in Hanover, Germany. It seems to get stronger and weaker in random intervals. Probably data transmission from the local transportation company Uestra. 155.47 MHz155,470,000 Hz
155,470 kHz
FM 12,000 Hz12 kHz
0.012 MHz
Hanover, Germany Unidentified uestra.jpg
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 kHz. 155.5 MHz155,500,000 Hz
155,500 kHz
 ??? 15,000 Hz15 kHz
0.015 MHz
Germany, Hameln near Hannover 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 MHz155,600,000 Hz
155,600 kHz
 ??? Turkey, Central Anatolia Unknown 155p6.jpg
Unknown 158 I found this signal on 158.665 MHz, which according to Industry Canada belongs to our local public works department. 158.665 MHz158,665,000 Hz
158,665 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide Unknown158 Waterfall.jpg
Unknown 161p995 Noisy signal from Italy. 161.995 MHz161,995,000 Hz
161,995 kHz
NFM Italy Unknown 161p995.jpg
Unknown 167 I've recieved this signal at 167,400MHz and recorded it as NFM (Bandwidth 8000). Location: Madrid, Spain. 167.4 MHz167,400,000 Hz
167,400 kHz
NFM 8,000 Hz8 kHz
0.008 MHz
Madrid, Spain Unknown 167.png
Unknown 173 None. 173.262 MHz173,262,000 Hz
173,262 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide Unknown173 Waterfall.png
Unknown 175p4968 I found this very slow frequency-modulated signal on 175.4968 MHz. 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 Hz for a while, before shifting back down. 175.497 MHz175,496,800 Hz
175,496.8 kHz
USB Belgium Unknown 175p4968.jpg
Unknown 220 Received in New London County. 220.914 MHz220,914,000 Hz
220,914 kHz
NFM, RAW 3,000 Hz3 kHz
0.003 MHz
Connecticut, USA Unknown 220waterfall.png
Unknown 28p597 28.597 MHz28,597,000 Hz
28,597 kHz
AM Croatia Unknown28597.png
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 MHz409,600,000 Hz
409,600 kHz
NFM 5,000 Hz5 kHz
0.005 MHz
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 NFM 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 MHz40,000,000 Hz
40,000 kHz
NFM 0 Hz0 kHz
0 MHz
South of The Netherlands Unknown40 2 Waterfall.jpg
Unknown 40 3 Sounds like a ringing phone. 40.672 MHz40,672,000 Hz
40,672 kHz
NFM 0 Hz0 kHz
0 MHz
Unknown40 3 Waterfall.jpg
Unknown 409 Unknown chirping like sound. 409.6 MHz409,600,000 Hz
409,600 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide Unknown409 Waterfall.jpg
Unknown 423p15 Unknown at 423.15 MHz. 423.15 MHz423,150,000 Hz
423,150 kHz
NFM 10,000 Hz10 kHz
0.01 MHz
 ??? Unknown 423p15.png
Unknown 441p660 441.66 MHz441,660,000 Hz
441,660 kHz
FM Croatia Unknown 441p660.png
Unknown 443p685 Possibly "Autocab" signal. 443.685 MHz443,685,000 Hz
443,685 kHz
FM Croatia Unknown 443p685.png
Unknown 443p886 443.886 MHz443,886,000 Hz
443,886 kHz
FM Croatia Unknown 443p886.png
Unknown 443p936 443.936 MHz443,936,000 Hz
443,936 kHz
FM Croatia Unknown 443p936.png
Unknown 445 Unknown. Sent from video clip.  ? 0 Hz0 kHz
0 MHz
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 RTTY?). I'm attaching an image and a 2 seconds IQ sample. 446 MHz446,000,000 Hz
446,000 kHz
USB 0 Hz0 kHz
0 MHz
Worldwide Unknown446 Waterfall.jpg
Unknown 452p862 452.863 MHz452,862,550 Hz
452,862.55 kHz
CW 1,990 Hz1.99 kHz
0.00199 MHz
Unknown Unknown 452p862.png
Unknown 455 None. 455 MHz455,000,000 Hz
455,000 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide Unknown455 Waterfall.png
Unknown 458p208 I have the following signal in attachment, which is transmitted all the time at roughly 458.208 MHz (center frequency), in four distinct frequencies separated by about 12.5 KHz. Each of the signals is roughly 5 KHz in bandwidth. The signals are received in Portugal near Lisbon. 458.208 MHz458,208,000 Hz
458,208 kHz
 ??? 5,000 Hz5 kHz
0.005 MHz
Portugal near Lisbon Unknown 458p208.jpg
Unknown 467p260 A few months ago I was scanning the UHF band inside my apartment with a Baofeng UV-5R when suddenly I've heard what in a first moment I believed that was packet radio. I have done a lot of packet radio, APRS, APT, AMTOR, PSK and other digital communications around the last 10 years but this.. I didn't know what the hell is. I heard it at 467.260 MHz, it is powerful as hell, since I can hear it using the stock antenna on my handy, and also I can hear it around 2km of my apartment. 467.26 MHz467,260,000 Hz
467,260 kHz
XXX 0 Hz0 kHz
0 MHz
 ??? 150x250px
Unknown 469 Found on 469.975 FM 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 MHz469,975,000 Hz
469,975 kHz
FM 0 Hz0 kHz
0 MHz
Israel [[Image:|150x250px]]
Unknown 550 Unknown FSK? 550.06 MHz550,060,000 Hz
550,060 kHz
USB 5,000 Hz5 kHz
0.005 MHz
Worldwide Unknown550 Waterfall.jpg
Unknown 648 Frequency shifting. Received in New London County. 648.01 MHz648,010,000 Hz
648,010 kHz
CW 300 Hz0.3 kHz
3.0e-4 MHz
Connecticut, USA Unknown 648waterfall.png
Unknown 75p219 75.219 MHz75,219,000 Hz
75,219 kHz
FM Croatia Unknown 75p219.png
Unknown 83 Unknown 83.7 MHz83,700,000 Hz
83,700 kHz
 ? 0 Hz0 kHz
0 MHz
Unknown Unknown83 Waterfall.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 MHz856,000,000 Hz
856,000 kHz
Unknown 0 Hz0 kHz
0 MHz
Worldwide No Audio File Unknown856 Waterfall.jpg
Unknown ALE Can someone verify this signal? Someone suggested it's a "Japanese MAFF 8FSK", but not sure. 6 MHz6,000,000 Hz
6,000 kHz
USB 0 Hz0 kHz
0 MHz
Worldwide UnknownALE Waterfall.png
Unknown CIS PSK Labeled as "CIS 3x PSK", but possibly mislabeled. Need a verification on the identity of this signal USB 2,500 Hz2.5 kHz
0.0025 MHz
Russia CIS unk.jpg
Unknown Chirping 2 Continuous bursts. Audio sample recorded in NFM. 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 MHz162,863,000 Hz
162,863 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide UnknownChirp2 Waterfall.png
Unknown Data Chirping Continuous signal. Audio sample recorded in NFM. 152.652 MHz152,652,000 Hz
152,652 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide UnknownDataChirp Waterfall.png
Unknown Helix Helix shape possibly due to under sampling in the waterfall display? 456.368 MHz456,368,000 Hz
456,368 kHz
NFM Unknown Unknown Helix.JPG
Unknown MPT1327-Like Sounds like MPT1327 but unable to decode with Unitrunker or Trunkview. 468.488 MHz468,487,500 Hz
468,487.5 kHz
NFM 8,000 Hz8 kHz
0.008 MHz
France Fouine91 MPT1327-Like.jpg
Unknown Pager-Like Unknown signal that sounds similar to a POCSAG pager, but seems not to be. Possibly a FLEX pager variant. 26.65 MHz26,650,000 Hz
26,650 kHz
NFM 10,000 Hz10 kHz
0.01 MHz
Worldwide UnknownPagerLike Waterfall.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.  ???  ??? No Audio File Unknown pear 1.png
Unknown Pulsing Periodic pulses. Sound sample recorded in USB mode. Possibly a GlobeWireless signal. 6 MHz6,000,000 Hz
6,000 kHz
USB 0 Hz0 kHz
0 MHz
Worldwide UnknownPulsing Waterfall.png
Unknown Ringing Repeats every minute. 154.646 MHz154,646,000 Hz
154,646 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide UnknownRinging Waterfall.jpg
Unknown Thin Pulsing Unknown thin pulses. 0 MHz0 Hz
0 kHz
NFM 10,000 Hz10 kHz
0.01 MHz
Unknown UnknownThinPulses Waterfall.png
Unknown Trunking Sounds like Motorola Type II smartnet, but Unitrunker does not recognize. 452.325 MHz452,325,000 Hz
452,325 kHz
NFM 0 Hz0 kHz
0 MHz
Worldwide UnknownTrunking Waterfall.png
Unknown trunking or data Unidentified data signal, possibly trunking 131.188 MHz131,187,500 Hz
131,187.5 kHz
FM Narrow 12,500 Hz12.5 kHz
0.0125 MHz
UK 133187500 strangetrunking.png
Unknown-1536125 This signal continuously broadcasts in short blips. 151.782 MHz151,781,500 Hz
151,781.5 kHz
, 469.761 MHz469,760,500 Hz
469,760.5 kHz
, 153.613 MHz153,612,500 Hz
153,612.5 kHz
NFM 10,000 Hz10 kHz
0.01 MHz
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 MHz162,300,000 Hz
162,300 kHz
AM 12,500 Hz12.5 kHz
0.0125 MHz
Belarus 162-343.jpg
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 MHz117,000,000 Hz
117,000 kHz
USB 3,000 Hz3 kHz
0.003 MHz
United Kingdom No Audio File Weird signal.png


Comments

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


Anonymous user #1

264 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

264 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

256 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

252 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

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

Anonymous user #5

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

Anonymous user #6

220 days ago
Score 0+-
Unknown Musical is JT65

Anonymous user #5

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

Anonymous user #5

206 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

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

Anonymous user #7

199 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

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

Anonymous user #8

194 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

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

Anonymous user #10

190 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

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

Anonymous user #7

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

Anonymous user #11

176 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

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

Anonymous user #12

157 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

155 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

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

Anonymous user #5

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

Anonymous user #5

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

Anonymous user #13

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

Anonymous user #14

104 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

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

Anonymous user #9

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

Vic

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

Anonymous user #12

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

Anonymous user #5

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

Anonymous user #5

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

LargeVirus

86 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

85 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

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

Anonymous user #5

88 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

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

Anonymous user #15

87 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

68 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

67 days ago
Score 0+-
thanks friend

Anonymous user #12

66 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

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

Anonymous user #17

14 days ago
Score 0+-

@Zimbabwe490

I meant to say khz not mhz obviously.

LargeVirus

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

Anonymous user #9

59 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

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

Anonymous user #12

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

Anonymous user #9

45 days ago
Score 1+-

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

Please let me know if you need more.

Admin

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

Cartoonman

35 days ago
Score 0+-
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

35 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

30 days ago
Score 0+-

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

big thanks !

LargeVirus

40 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

28 days ago
Score 0+-
can i ask why a morse code signal needs to devour so much bandwidth

Anonymous user #5

40 days ago
Score 1+-

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

Australia

Anonymous user #9

31 days ago
Score 0+-

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

make the sigidwiki the one and only place for signals !

Zimbabwe490

27 days ago
Score 0+-
thanks whoever updated my page i completely forgot about it rfl

Cartoonman

27 days ago
Score 0+-

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

25 days ago
Score 0+-
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

25 days ago
Score 0+-
Thanks for the clarification. I'll go ahead with the waterfalls then, and add a spectrum as an additional image.

LargeVirus

21 days ago
Score 0+-
You, Cartoonman, I like you. Let's be friends. also, Unknown 155p47 is logic trunked radio.

Anonymous user #19

21 days ago
Score 0+-
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

21 days ago
Score 0+-
/\ that was me. forgot to log in, as usual :)

LargeVirus

21 days ago
Score 0+-
Cool, any way I can talk to you like Steam or something? =P

Cartoonman

21 days ago
Score 0+-
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

20 days ago
Score 0+-
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

19 days ago
Score 0+-

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

19 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

19 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

18 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

17 days ago
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oops, forgot my passw.

Anonymous user #14

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

Cartoonman

13 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

11 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

11 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

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

MikeAgner

10 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

10 days ago
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Hi All,

I have sound signal file. Need input.

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

Cartoonman

10 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

9 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

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

Cartoonman

8 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

8 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

8 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

8 days ago
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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

8 days ago
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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

8 days ago
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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

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

MikeAgner

8 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

8 days ago
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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

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

Cartoonman

8 days ago
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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

8 days ago
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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

8 days ago
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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

8 days ago
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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

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

Mike

MikeAgner

7 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

7 days ago
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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

7 days ago
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OK I'll tackle this tomorrow eve...Mike

Anonymous user #23

6 days ago
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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

6 days ago
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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

6 days ago
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I'd say some are most likely ionosondes of some sort, or HF radars or testing signals.

Cartoonman

6 days ago
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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

6 days ago
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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

6 days ago
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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

6 days ago
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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

5 days ago
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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

5 days ago
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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

5 days ago
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If you have any ideas, shoot em my way.

Admin

5 days ago
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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.

MikeAgner

4 days ago
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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

4 days ago
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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

4 days ago
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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

4 days ago
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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.
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