Switzerland and the Principality of Liechtenstein
Radio Interface Regulation

784.101.21 / RIR01011)
Aeronautical communications

Aeronautical communications
117.975 - 137.000 MHz
VDL Mode 2
Edition 4.2 / 01.01.2021

Nr Parameter2)DescriptionComments
1Radiocommunication serviceAeronautical mobile-
2ApplicationAeronautical communicationsVHF digital link, VDL Mode 2
3Frequency band117.975 - 137.000 MHzThe Frequency 121.5 MHz shall be used only for emergency communication.
4Channelling25 kHz-
5Modulation / Occupied bandwidthD8PSK31.5 kbps (Differential 8 Phase Shift Keying)
6Direction / Separation--
7Transmit power / Power densityMax. 250 W-
8Channel access and occupation rulesCSMA(Carrier Sense Multiple Access)
9Authorisation regimeSwitzerland:
Ground Based equipment: License required.
Aircraft equipment: Notification required.
Liechtenstein: Individual assignment required.
Aircraft radio equipment is listed in the 'Aircraft station license'.
10Additional essential requirements--
11Frequency planning assumptionsEN 301 841-1, ICAO Annex 10, Volume V, ICAO EUR Doc 011.-
12Planned changes--
13ReferenceEN 301 841-3 /-/-.Effective use of spectrum / ECC Decisions / ECC Recommendations.
14Notification numberG/TBT/N/CHE/102
15RemarksEN 301 489-22, ICAO Annex 10, Volume III, Volume V, ICAO EUR Doc 011.-

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