Switzerland and the Principality of Liechtenstein
Radio Interface Regulation

784.101.21 / RIR06011)

121.5 MHz / 243.0 MHz
GMDSS / VHF homing equipment
Edition 4.0 / 01.08.2018

Nr Parameter2)DescriptionComments
1Radiocommunication serviceAeronautical mobile (R)-
2ApplicationEPIRBsMaritime Emergency Position Indicating Radio Beacons (EPIRBs).
Global Maritime Distress and Safety System (GMDSS) / Transmission of radio signals on 121,5 MHz or 121,5 MHz and 243 MHz for locating vessels, survival craft and man-overboard in distress.
3Frequency bandA: 121.45 - 121.55 MHz
B: 242.95 - 243.05 MHz
Band A: 121.5 MHz homing frequency.
Band B: 243.0 MHz homing frequency.
5Modulation / Occupied bandwidthA3X-
6Direction / Separation--
7Transmit power / Power densityMax. 100 mW e.r.p.e.p.Min. 75 mW e.r.p.e.p. (Effective Radiated Peak Envelope Power).
Min. 25 mW e.r.p.e.p. for man-overboard devices.
8Channel access and occupation rules--
9Authorisation regimeEPIRBs shall not be operated on the territories of Switzerland and the Principality of Liechtenstein-
10Additional essential requirementsEN 300 152See also SR 784.101.21, VFAV, Anhang 1.
11Frequency planning assumptions--
12Planned changes--
13ReferenceEN 300 152 /-/-.Effective use of spectrum / ECC Decisions / ECC Recommendations.
14Notification number2009/9501/CH
15RemarksEN 60945, SOLAS, ITU-R, IMO.-

Normative part: 1 to 11
Informative part: Nr 12 to 15

1) RIR for similar and/or other applications are available under: https://www.bakom.admin.ch/bakom/en/home/frequenzen-antennen/nationaler-frequenzzuweisungsplan/schnittstellen-anforderungen.html
2) For explanations and legal status, please refer to basis document 784.101.21 / RIR0000