Switzerland and the Principality of Liechtenstein
Radio Interface Regulation

784.101.21 / RIR10131)
Wireless audio applications

RIR1013-19
LP FM Transmitter
87.5 - 108.0 MHz
50 nW e.r.p.
Edition 5.0 / 01.01.2026

Nr Parameter2)DescriptionComments
1Radiocommunication service--
2ApplicationLP FM Transmitter-
3Frequency band87.500 - 108.000 MHzBand II LPD shall operate on user selectable frequencies within the 87.6 to 107.9 MHz frequency range.
4Channelling-Selectable frequency steps of 50 kHz, 100 kHz or 200 kHz.
5Modulation / Occupied bandwidthFM / max. 200 kHz-
6Direction / Separation--
7Transmit power / Power densityMax. 50 nW e.r.p.Integral antenna
8Channel access and occupation rulesAccording to harmonised standard: Band II LPD shall cease to transmit within 1 minute of removal of the audio input signal.Pilot tones to ensure continuity of transmission are not permitted.
9Authorisation regimeSwitzerland: License exempt.
Liechtenstein: General authorisation.
Operation on NIB / NPB. (Non interference basis / non protection basis).
10Additional essential requirements--
11Frequency planning assumptionsEN 301 357Clause 8.2 and 8.3
12Planned changes--
13ReferenceEN 301 357 /-/ ERC/REC 70-03, Annex 10.Effective use of spectrum / ECC Decisions / ECC Recommendations.
14Notification numberG/TBT/N/CHE/298
2025/9021/CH
-
15RemarksEN 301 489-9-

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/en/technical-interface-regulations
2) For explanations and legal status, please refer to basis document 784.101.21 / RIR0000