Intruder Watch by DARC, Germany


We deal with non-amateur radio band intruders primarily in the shortwave bands allocated for exclusive use by the Amateur Radio Service up to 30 MHz under the International Telecommunication Treaty:

Frequency (kHz)


7.000 - 7.200

40m band

14.000 - 14.350

20m band

18.068 - 18.168

17m band

21.000 - 21.450

15m band

24.890 - 24.990

12m band

28.000 - 29.700

10m band


In the national context, this regulates the Amateurfunkverordnung (AFuV), Anlage 1 (zu § 1 Nr. 6).

In cooperation with the german PTT Bundesnetzagentur


Monitoring and reporting centre for foreign radio services within the exclusive the exclusive amateur radio bands up to 30 MHz (shortwave, HF)


The Intruder Monitoring Unit of the DARC is the intruder watch of the DARC e.V. and deals with unauthorised use of our bands by other radio services within the framework of frequency monitoring. At the same time, it serves as a reporting centre for the radio amateur community and in this function receives reports on intruders. On this basis, we consolidate the information and, if necessary, initiate official steps that lead to the shutdown of illegal transmissions.


Unauthorised use of the amateur radio bands occurs when a foreign station uses the 40-, 20-, 17,- 15-, 12- or 10-metre bands, because according to the international telecommunications treaty these bands are exclusively allocated to amateur radio.



About radio intruders


Intruders are, for example, radio transmitters or their harmonics, digital modes of operation - such as Morse telegraphy, radio teletype or multiplex transmissions from the military, embassies or international organisations - radiotelephony traffic from the circle of users just mentioned and private radio pirates in the SSB (single sideband), AM (amplitude modulation) and FM (frequency modulation) modes of operation, the most diverse digital modes of operation, over-the-horizon radars, ocean wave radars, drift net buoys or illegal taxi radio.


The Intruder Monitoring Unit is not directed against radio amateurs who, for example, do not comply with band plans or harass or insult other radio amateurs. We also cannot help with local interference, such as that caused by PCL or switching power supplies.

Three over-the-horizon radars (OTHR) are occupying wide frequency ranges in the 40m band (2021). © Photo: Daniel Möller, DL3RTL

Legal basis of our work


The Intruder Monitoring of the Deutscher Amateur-Radio-Club e. V. is the German branch of the "International Amateur Radio Union Monitoring Systems" (IARU-MS) according to the IARU Resolution 12-1 "Terms of reference for the IARU Monitoring System".





We are in close and long-standing contact with various institutions, which we can address directly and involve directly via short channels, including offices of the radio measurement service of the german PTT (BNetzA).



Prüf- und Messdienst

Reporting form

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Report intruders to the intruder watch of DARC


Any radio amateur or shortwave listener can report intruders - i.e. non-amateur radio stations, no electromagnetic interference - to the band watch at any time using the report form. This is independent of a membership in the DARC e.V..


In the report form there is also the possibility to upload a screenshot of a waterfall diagram. Unfortunately, entries by e-mail cannot be processed.

Your data will be transmitted electronically to the band watch and managed there in a digital system. This system automatically triggers an alarm and notifies all service staff of the band watch by e-mail and directly as a message on your smartphone.

It only takes a few minutes from the time you submit your report to the time the service team is informed. As a submitter, you will receive an email from our system immediately after submitting the form, with a link where you can view the progress of the processing or make additions online at any time.


According to availability and time of day, the staff will begin to condense the information, compare it with other reports and, if necessary, ask the submitter questions. Experts in foreign languages and digimodes are also involved if necessary.

If all the information is available and it is a new intruder (foreign band intruder/radio service), the data set is transmitted to the BNetzA via a coordinated procedure, which in turn creates an observation case to confirm the foreign signal.


If the new intruder is confirmed, a so-called international complaint is usually sent to the corresponding country of origin.

Intruder reports of the previous month

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The DARC intruder watch also reports its most important observations to IARU R1, where they are published in a monthly newsletter together with reports from other amateur radio associations in IARU Region 1.


IARU MS R1 reports of the last month

Contact persons

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The unit currently comprises 21 core staff from the areas of monitoring, analysis, radio directin finding, language translation, IT and project management.


Daniel Möller, DL3RTL
(c) Daniel Möller

Daniel Möller, DL3RTL

Speaker Intruder Monitoring Service of DARC e.V.
National coordinator

Alex Schill, DB3TA
(c) Alex Schill

Alex Schill, DB3TA

Deputy speaker Intruder Monitoring DARC e.V.
Head of backoffice

Core team

Monitoring service


AlexDB3TAProcessing and profiling
DanielDL3RTLProcessing and profiling
MichaelDH6MBProcessing and profiling
SvenDF2KSProcessing and profiling
NorbertDL8LAQRadio beacon monitoring
JürgenDL2SCHRadio beacon monitoring



Analyses service


AlexDB3TASignal analyses
DanielDL3RTLSignal analyses



Radio direction finding


ErwinDL2KCWTDoA and evaluation





Project management
System administration


DanielDL3RTLAgile projekt management, system administration, Webmaster



Data privacy


SvenDF2KScontact person for data protection



Language translation


The intruder monitoting unit has another team for translation tasks. Native speakers of a wide variety of languages (from Vietnamese to Russian to Brazilian Portuguese) are on hand to translate phonetic content to German language.


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The monitoring service and analysis staff are equipped with modern, professional SDRs. They also have access to a computerised, automated recording system.

The direction finding service will be equipped with its own remote and networked direction finding sites before the end of the year.

In the area of organisation and administration, we work with the latest project management software and ticket systems to manage and document the assignments.


(c) DARC e.V.

The Intruder Monitoring Unit of the DARC is divided into the Monitor Service, Analysis Service, Tracking Service as well as Translation and Project Management.

Monitoring service

The monitoring service is used to observe and log the HF bands for intruders. We make use of different sources for this.

We have technical possibilities for automated band monitoring. In addition, we receive reports from the ranks of radio amateurs, which reach us via the band watch reporting form. We call such reports community reports. They are processed in a modern electronic system.

It doesn't matter from which source the information comes: It is collected and condensed to create a profile of the intruder.


Analyses service

In monitoring, we are not always successful in classifying a signal right away. Sometimes there can be deviations or even new procedures. We have the relevant experience and resources to analyse such signals and assign them to a specific procedure.

Radio direction finding service

It is important to know where the foreign signal comes from. Only then it can be assigned to a specific radio service or originator with a high degree of probability. The DARC band watch uses the KiWi network with the TDoA function for this purpose.

In order to be able to achieve a consistently high DF quality, the band watch is currently setting up its own KiWi at locations far apart from each other. These are equipped with very sensitive antennas and are exclusively available to the intruder watch.


Language translations

Not all foreign signals can be assigned to digital operating modes. Occasionally, they are also transmissions in phonics. The intruder watch maintains a network of translators, including for Eastern European and Asian languages.


Projektmanagement, Development und Datenschutz

Um unsere Systeme zu bedienen und Konzepte für vielfältige Aufgaben zu entwerfen, verfügt die Bandwacht über ein eigenes Projektmanagement, eigene Developer und einen Ansprechpartner für Datenschutz. Wir arbeiten strukturiert nach modernen, halbagilen Prozessen und mit Systemen, die state of the art sind.



Technical equipment

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System status

 Monitoring in service

 Direction finding
 on standby 

 Service team available 




  • Server with RAID 10 SSD Cluster
  • UPS for the entire setup
  • fire alarm system
  • Security technology

(c) Daniel Möller, DL3RTL

Monitoring and analysis systems

The Intruder Monitoring of the DARC e.V. is equipped with state-of-the-art, software-supported systems.

They allow the automatic recording and analysis of emissions.


At the software level, we work with, among others


(c) Daniel Möller, DL3RTL

The hardware consists of


  • a commercial broadband magnetic antenna

  • an antenna splitter

  • sevaral SDR Winradio® G33DDC nad G31DCC

  • a server with

    • the monitoring software go2monitor®

    • Control software for the SDR

    • Control software for the antenna splitter

  • and various other support systems

Automated Radio Monitoring

The core of our system is the Procitec go2monitor® software. It allows us to scan shortwave frequency ranges for emissions in real time. The system simultaneously records all signals and classifies them. The parameters of the emissions are written into a database and stored there for further evaluation.



(c) DARC e.V.
(c) DARC e.V.
(c) DARC e.V.
(c) DARC e.V.


The following video shows part of our facility in operation, using the 40-metre band as an example:


Procitec go2monitor® in use at the Intruder Monitoring of DARC e.V.

Club station DLØIMO and DR5ØBAWA

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DL0IMO is the club station of the Intruder Monitoring Unit (intruder watch).

DR50BAWA is the special call and 50BW the special DOK for the 50th anniversary of the band watch of the DARC e.V.

Intruder Monitoring on the air

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The Intruder Monitoring team is also QRV on the bands under the call DL0IMO.

IMO stands for Intruder Monitoring.


DL0IMOIMOvia bureau


Radio contact will be exclusively with intruder watch staff.

We look forward to contacting you and confirm QSL cards via the office.

Special call sign DR50BAWA and special DOK 50BW

The Bandwacht celebrates its 50th anniversary in 2022.


To mark this occasion, from 01.01.2022 to 31.12.2022 we will issue the special DOK 50BW

and work with the special call sign DR50BAWA.


Callspecial DOKQSL
DR50BAWA50BWvia bureau


Contacts will be made exclusively with the intruder watch staff.
For every QSL card received, we send a special anniversary QSL card via the office.




You can find the activity dates under this link at


We confirm contacts with a QSL card via the office.



(c) DARC e.V.

General contact form

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Important note

We do not accept Intruder reports via this form.

For a report to the intruder watch please use the following form:


Intruder report form

General contact form

General contact form
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