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Radio Signals Recognition Manual

ARTEMIS. In a nutshell.

In short, ARTEMIS is a signals hunter software and a useful aid for radio listeners! The analysis of real-time spectra (from your SDR, for instance) is made simple: you can take advantage using one of the largest RF signal database (with over 370 records). Compare several signals properties (such as frequency, bandwidth, modulation, etc.) and verify what you are searching for through a waterfall/audio sample. A collection of filters allows you to narrow your search, making the identification of unknown signals, odd buzzes or weird noises way easier.

Table of contents

Run the software

Artemis 3 is entirely written in Python, so if you already have Python 3.7.0+ installed in your system, you can directly run the main script. Otherwise you can download a binary executable (see below).

Run from binary

If you don't know what you want or you are not sure where to look, this is for you.

Basically, this is the easiest, smooth, and clean way to run Artemis 3. A Python installation is not required. For more information, follow the main page of Artemis 3 (detailed documentation at the end of the main page).


  • Windows 7/8/8.1/10
  • Linux: Ubuntu 20.04+, Mint 20+, Fedora 32+ and many other. You need at least version 2.31 of the GLIBC system library (details)
  • macOS 11+ (Big Sur or later)

Run from source code

Run the software from the source code with the Python interpreter is the simplest and natural way to run Artemis 3.


  • Python (ver. 3.7.0+)
  • Python libraries (in requirements/requirements.txt)
  1. Download and install Python (ver. 3.7.0+) from the official website. Be sure to select the flag Add Python 3.x to PATH during the first part of the installation.

  2. Install the necessary Python libraries with PIP. Open a console in Artemis/requirements folder and type:

pip install -r  requirements.txt --user
  1. After that launch the software in the Artemis folder with:

Compile from source code

If you want to compile Artemis yourself from the source code follow the instructions in the spec_files/README file.


The database (db.csv) is directly extracted from with a DB parser and reworked to a standard format defined as follow. Artemis DB is a human-readable csv file where the delimiter is the character * (Asterisk, Unicode: U+002A). The new entry (separation between signals) is the End Of Line (EOL) escape sequence \n. Every signal is directly connected to spectra and audio sample stored in Spectra and Audio folders, respectively. Every signal is composed of 12 columns:

Column Description Unit of Measurement Multiple Items Type
1 Signal name - - string
2 Freq. Lower Limit Hz - integer
3 Freq. Upper Limit Hz - integer
4 Mode - - string
5 Band. Lower Limit Hz - integer
6 Band. Upper Limit Hz - integer
7 Location - string
8 sigidwiki URL - - string
9 Description - - string
10 Modulation - string
11 ID Code - - integer
12 Auto-correlation function ms string


  1. Signal Name: The name of the signal. A simple string that describes in short the analyzed signal. Special characters are allowed (except the main delimiter *).

  2. Frequency (Lower Limit): The frequency lower bound expressed in Hertz.

  3. Frequency (Upper Limit): The same as above but this express the frequency upper bound of the received signal.

    • In the case of a single frequency transmitter/service the Freq. Lower Limit and the Freq. Upper Limit must be coincident (same value)

    • Transmission with different protocols must be added in two or more distinct entry. DO NOT USE the same signal page to add different transmission protocols (with different frequencies, bandwidth, modes,...). For example, NOAA-19 satellite transimit images and data with two different protocols:

      • APT (Analog): 137.1000 MHz - 137.3125 MHz
      • HRPT (Digital): 1698 MHz - 1707 MHz

      Add two separate entry (APT and HRPT) with the correct Lower and Upper bound frequency. DO NOT ADD a single signal entry with a Freq. Lower Bound of 137.100 MHz and the Upper Bound of 1707 MHz.

  4. Mode: This field reports the way how a signals has been decoded during the reception.

  5. Bandwidth (Lower Limit): As reported above for frequency (points 2 and 3). Also here the value is reported in Hz.

  6. Bandwidth (Upper Limit): As reported above for frequency (points 2 and 3).

  7. Location: This is the location where the signal is distributed/received. Avoid the usage of the precise location of the TX station or very small town (very rare). It's a good habit to use nations/continents or special location (worldwide).

  8. sigidiwki URL: The sigidwiki URL of the selected signal. This is a direct connection to the online database where further details of the signal are collected.

  9. Description: The short description is used to explain the purpose of the signal and some other useful details.

  10. Modulation: The modulation is the way how the information have been encoded into the main signal (carrier). Several modification of the properties (Amplitude, Frequecy, ...) are possible and a tx station could transmit with different modulations.

  11. ID Code: The category code, known as ID Code, is a sequence of 0/1 and its main purpose is to assign the signal to their families/categories. It's formed by 17 digits:

    1 2 3 4 5 6 7 8 9 10
    Military Radar Active Inactive HAM Commercial Aviation Marine Analogue Digital
    11 12 13 14 15 16 17
    Trunked Utility Sat Navigation Interfering Number Stations Time Signal
  12. Auto-correlation funtion (ACF): The ACF is an awesome discriminator when the signal is composed of redundant pattern that continouosly repeats. Unfortunately, for this reason, ACF is not always available. The time value is reported in ms and, in some cases, could have multiple values for a single signal. An extended description with an example signal analysis is available here:

... ID Code * ACF1 Description - ACF1 Value (in ms) ; ACF2 Description - ACF2 Value (in ms) ; ...

Example 1 (D-STAR):

... ID Code * Superframe - 420 ; Frame - 20

Example 2 (EDACS):

... ID Code * edacs48 - 60 ; edacs96 - 30

Special case: variable ACFs are allowed and a brief explanation can be reported instead of ACF Value. A nice example is the * SSTV transmission where the ACF is directly related to the number of lines per minute.

Multiple Items fields (Location, Modulation)

The necessity to manage a multiple Location/Modulation search pushed us to implement a fictitious 'secondary delimiter' chosen to be the ; character. For instance:

... Band. Upper Limit * Location 1 ; Location 2 ; ... * sigidwiki URL ...


... Description * Modulation 1 ; Modulation 2 ; ... * ID Code ...


The only folder with the pre-built package is the themes one. In this way the themes are fully customizable and you can add your own. New themes (in the themes folder) will appear automatically in the main menu and the last used theme will be saved as the favorite one (a restart of Artemis will use the last used theme).

Some of the available themes were adapted from


This program (ARTEMIS 3, 2014-2022) is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see: