[IARU R2 Logo]

International Amateur Radio Union
Region 2


  Home Reports Documents Contact the MS Tech Stuff Newsletters IARU Region 2


Who we are


Reporting an intruder

V/UHF Intruders

Sound files

Privacy policy

MS Terms of reference

Useful links

Visit IARU MS in R1

Visit IARU MS in R3


News Flash

To all Amateur Radio operators: Our frequency bands need your help. Support the activities of the Intruder Watch.

Dear colleagues,

The IARU Region 2 Monitoring System restarts its activities and invites all radio amateurs to participate through their National Societies.

This “first stage” website was originally created by Martin Potter VE3OAT, former IARUMS R2 Coordinator. Currently, it is undergoing a redesign process of its “look and feel” and update of its content, among other objectives.

My intention is to present the new one very soon. At present time, I am working on completing the translation of the Tech Stuff section of the Spanish version, which I expect to finish in a few days.

Your feedback is welcome!

73 de LU1BCE

The Monitoring System (MS or Intruder Watch) of the International Amateur Radio Union (IARU) is dedicated to identifying and removing all non-Amateur radio stations from those Amateur bands which have been allocated exclusively to the Amateur and Amateur-Satellite Services by the International Telecommunications Union (ITU). Stations which violate these frequency allocations are called intruders. The work of the IARU MS is carried out by volunteer Amateur Radio monitors all over the world, working for their national Amateur Radio societies and coordinated by the IARU MS in each of the three ITU regions of the world.

In ITU Region 2 (South, Central and North America) the following frequency bands have been allocated by the ITU exclusively to the Amateur or Amateur-Satellite Services:

    1.800 -     1.850 MHz
    3.500 -     3.750 MHz (except in Perú)
    7.000 -     7.100 MHz (world-wide except in some African and Asian countries)
    7.100 -     7.300 MHz (but not in Regions 1 and 3)
  14.000 -   14.250 MHz (world-wide)
  14.250 -   14.350 MHz
  18.068 -   18.168 MHz
  21.000 -   21.450 MHz (world-wide)
  24.890 -   24.990 MHz (world-wide)
  28.000 -   29.970 MHz (world-wide)
  50.000 -   54.000 MHz
144.000 - 146.000 MHz* (world-wide except in China)
146.000 - 148.000 MHz (except in Cuba and Guyana)

*The sub-band at 145.80 - 146.00 MHz is particularly vulnerable to intruders because it is used for Amateur Satellite uplinks. See VHF/UHF intruders.

In ITU Regions 1 (Europe and Africa) and 3 (Asia and Oceania) allocations have been made that are similar, but not identical, to those shown here for Region 2.

Some intruders appear in our bands unintentionally, by administrative or technical error, but others are there intentionally and illegally. Some intruders are commercial or military communications, some are international or domestic shortwave broadcasts, but most intruders are ordinary citizens who have obtained a radio transmitter and are using it without a license and without any regard for the international frequency allocations that govern all legitimate users of the radio spectrum. It is only by reporting all intruders to the proper authorities that we might ever clear the Amateur bands of this unnecessary interference.

If you hear a non-Amateur radio station in any of the above Amateur bands and you believe that the station is not located in any of the excepted countries, please report the station to the MS Coordinator of your national Amateur Radio society.

Note that the IARU MS is not a "police force". Only national governments can enforce the radio regulations. The Monitoring System achieves its goals by coordinating and facilitating the sharing of relevant technical information among IARU member societies, and by encouraging the enforcement of applicable radio regulations by national telecommunications administrations.

You can help to defend the Amateur Radio bands. 
Contact your national Amateur Radio society.