iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
SIGIDWiki is a practical reference for comparing radio signals—not a decoder that conclusively explains every unusual transmission. It pairs example sounds with waterfall images and maintains separate listings for identified and unidentified signals. Compare a recording’s sound and visual pattern with those examples, then use details such as frequency, bandwidth, mode, modulation and location to narrow possible matches.
What is SIGIDWiki?
The Signal Identification Wiki describes its purpose this way: “This wiki is intended to help identify radio signals through example sounds and waterfall images.” Its entries are intended as reference material: a resemblance can point you toward a possible match, but it does not prove that two transmissions have the same source or purpose.
The wiki’s guide says many examples are received and recorded with software-defined radio (SDR) devices, including RTL-SDR, Airspy, SDRPlay, HackRF, BladeRF, Funcube Dongle and USRP. An SDR is equipment for receiving and recording radio signals; you do not need to own one just to browse the wiki. The guide also says anyone can edit the wiki and points readers to its editing, discussion and comment routes. Read the Signal Identification Wiki guide.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThe guide describes Artemis 3 as a companion app with an offline reference collection, sorting and filters, audio samples and waterfall images. Its current price, availability and platform compatibility are not established by the guide.
#1 Best Overall
- A digital portable receiver with comprehensive radio frequency coverage including AM, FM, longwave, shortwave, and single side band
- Adopts modern DSP digital demodulation technology as well as synchronized detection for enhanced and unparalleled reception sensitivity, selectivity, and anti-image interference capability across the bands
- A premium full-range 8 ohms / 250 mW speaker delivers loud, rich, crispy, dynamic and distortion-free sound for utmost entertainment experience, a 3.5 mm stereo earphone jack for private listening (stereo earphones included)
- Other convenient features include an alarm clock; a sleep timer of up to 120 minutes; external antenna input; 3.5mm audio output; 850 memories for easy access to frequently listened stations; keylock function for preserving settings
- Latest Updated Firmware Version 3307
How do you use SIGIDWiki to look up a signal?
- Compare the capture. Listen to the recording and inspect its waterfall image—the visual display of signal activity over time and frequency—alongside examples in the wiki.
- Narrow the possibilities with attributes. Check the frequency range, bandwidth, mode, modulation and location associated with entries. The identified database exposes fields including title, frequency range, location, mode and modulation, with sorting options. Browse identified signals.
- Check whether the entry is identified or unresolved. A match in an identified entry is a useful lead, not independent confirmation that your recording is the same signal. Unidentified entries can help you find similar reports, but an unresolved listing does not establish what a signal is.
- Record the context before drawing a conclusion. Note where and when you received the signal, its frequency and bandwidth, and what the audio and waterfall actually show. Keep observed details separate from any theory about who transmitted it or why.
The wiki’s pages and categories make it possible to compare signals by attributes such as frequency, mode, modulation, bandwidth, location and activity or status. Those details are more useful together than an audio resemblance alone.
What makes an unknown-signal report useful?
The wiki asks contributors to provide as much useful context as possible for an unknown signal. Include the capture details and files that let another reader assess it rather than relying on a description such as “strange noise.”
Rank #2
- Best reception, full range coverage including AM/FM, Longwave & Shortwave with Single Side Band
- PLL synthesized digital dual conversion receiver with unparallelled sensitivity & selectivity
- 4 & 5 selectable bandwidth filters on AM and SSB respectively plus single Side Band receiver with 10 Hz tuning step
- Alarm clock plus sleep timer from 0-120 minutes
- 1 Year USA warranty.
- Frequency: Give the frequency at which you received it.
- Location: State where the reception occurred; location can help others compare reports.
- Bandwidth: Include the signal’s bandwidth if you can determine it.
- Waterfall image: Show the visual pattern, not just a written account of what it sounded like.
- MP3 audio sample: Provide a recording so readers can compare its sound with examples.
If you recognize a signal, the wiki invites you to edit its page or leave a note through the page discussion or comments on the unidentified-signals database. Visit the unidentified signals database.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →How should you read “enigmatic” or suspected attributions?
SIGIDWiki has a “Numbers Stations and Enigma Stations” category for signals that may be connected to numbers-station activity or are considered enigmatic in behavior and content. The category provides descriptions and signal attributes; the label does not, by itself, verify an operator, purpose or origin. See the Numbers Stations and Enigma Stations category.
Rank #3
- Large Speaker Ensures Clear Loud Sound: DreamSky portable radio comes with big high performance speaker which provides loud and great sound quality that can easily fill a room. Listening to music, NPR, news, sports games & talk shows is definitely a great enjoyment with this shortwave am fm radio.
- Strong Reception with High Low Tone: the transistor radio with long range transistor antenna pulls in strong and crisp clear AM radio, FM radio and SW shortwave radio despite of nowhere. High and low tone selection brings you different audio enjoyment while with the earphone jack, you are able to listen to your favorite radio broadcasts without distraction nor bothering others.
- Large Smooth Analog Dials Easy to Use: the controls of this small radio are solid and simple at a glance, simply rotate the big volume knob and tuning wheel, then relax and enjoy the moment! Looking for an old-school entertainment and small gifts for your parent, dad, mom, uncle, aunt, your loved one, the elderly, seniors and kids? This handheld radio is your choice!
- Digital LCD Time Display with Backlight: with the large digital display on the digital radio, you can see exactly what station you tune to without having to guess. Screen backlight helps you see clock time and station clearly in the dark. Time format of this clock radio is 12Hr and 24Hr optional.
- AC Adapter or Battery Operated Radio for Home and Outdoor: the digital fm radio supports two power sources, either plug in the radio for indoor use while in kitchen, doing cleaning, cooking or reading without having to depend on batteries in stock, or using 4 AA alkaline batteries (not included) while working outside, doing yard work, walking the dogs, camping, hiking, beaching, drive in theaters etc. During power cut, the battery radio helps to let go of boredom and isolation, while emergency like bad storm or hurricane strikes, the small portable radio keeps you connected with the ourside world.
When a page or discussion proposes an explanation, distinguish the recorded characteristics from the interpretation. Describe an origin as suspected or reported unless it is confirmed, and do not treat unusual content as proof of a particular source.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How large is the database?
The identified-signals page displayed 593 entries when accessed in 2026. That is a live wiki count, not a fixed measure of coverage; check the page for its current total. The wiki’s main page has also displayed counts for unidentified and requested signals, which can change as entries are added or updated. Check the live identified-signals listing.
Quick Recap
Best Value
- 【Upgraded Functions】ESD-Protected Antenna Input -Prevents static damage for long-term durability, shielded Si4732 Tuner lsolates the circuit from electromagnetic noise, Hi-Z circuit is front-end placed to preserve signal resonance, powered by stable VCC RADlO to reduce noise，add earphone antenna function. V4 hardware solution supports the latest version of firmware, bringing better experience to users.
- 【Supports Comprehensive Band】Powered by the ESP32-S3 main control unit, and adopted with the SI4732 chip, this small radio ensures high sensitivity and minimal interference, and supports all broadcast bands, including LSB, USB, AM and FM modes.
- 【Better Sound Quality】 Designed as a portable AM FM radio receiver, it features a built-in 1W cavity speaker delivering rich, loud audio, along with an upgraded earphone amplifier circuit for clear high-volume headphone listening.
- 【Enhanced Signal Reception】 ATS MINI V4 Radio adopts a Hi-Z circuit to improve weak signal resolution, elevating your listening clarity even in challenging environments and offering reliable everyday operation.
- 【Compact and Durable】With Exquisite metal Shell, 1.9-inch HD screen, and rechargeable built-in 800mAh battery, ATS MINI V4 Radio has more rugged construction. It's still lightweight and pocket size, good choice for for walking, hiking, camping, fishing or sharing with family&friends.
Rank #4
- 1674 station presets with 3 individual memory banks and 42 time zones with dst setting & 2 editable city names. ats (auto tuning system) on lw/mw/sw/fm with 5 tuning methods: direct frequency tuning/auto scanning/manual tuning/memory recall/rotary tuning and fine tuning & quick shift tuning controls. dsp tuner (fm); pll synthesized (mw/lw/sw)
- New air band mode (118~137mhz), information indications for rds/ps/pty/rt/snr/rssi/memory bank, ssb (single sideband): usb/lsb 10 or 20hz/fine tuning step, manual & automatic bandwidth control and squelch function for adjusting the receiving threshold to eliminate weak transmissions and dual conversions for sw/lw/mw/air bands.
- Real time clock, 3 alarm timers with radio or hws (humane wake system) buzzer, adjustable sleep and snooze timer, tone controls (music/normal/news), with multi-functional menu and larger lcd screen (3.33” x 1.95”) with led backlight, fm softmute feature, editable station display up to 10 characters and individual headphone amplifier.
- Built-in advanced battery charger (batteries sold separately) with faulty detection feature, battery & signal strength indicator. rotary tuning, 10 - key input, aux-in, line output and standby.
- Includes switchable ac adapter (input voltage: ac 100-240v, 50/60hz) ant-60 portable shortwave antenna, protective carrying pouch and quality stereo earbuds.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
