Switzerland and the Principality of Liechtenstein
Radio Interface Regulation

784.101.21 / RIR01031)
Aeronautical surveillance

RIR0103-05
SSR
960 - 1164 MHz
SSR, Mode A, C, S
Edition 3.1 / 01.01.2021

Nr Parameter2)DescriptionComments
1Radiocommunication serviceAeronautical radionavigation-
2ApplicationSSRSSR (Secondary Surveillance Radar) ground based. Mode A, C, S (Interrogation mode).
TCAS (Traffic Alert and Collision Avoidance System) on aircraft.
SSR Transponder on aircraft.
3Frequency band960 - 1164 MHzCentre frequency (SSR and TCAS Interrogator) = 1030 MHz
4Channelling--
5Modulation / Occupied bandwidthL9D / 8M00ICAO Annex 10, Volume IV. Occupied bandwidth according to ICAO Annex 10, Volume IV, Figure 3.2
6Direction / Separation-Transponder reply center frequency = 1090 MHz
7Transmit power / Power density-ICAO Annex 10, Volume IV
8Channel access and occupation rules--
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 assumptionsICAO Annex 10, Volume IV-
12Planned changes--
13Reference-/-/ ERC/REC 74-01.Effective use of spectrum / ECC Decisions / ECC Recommendations.
14Notification numberG/TBT/N/CHE/102
2008/9503/CH
-
15RemarksICAO Annex 10, Volume IV.Mode-S IR allocations requests (Interrogator Code) will be coordinated by FOCA and revalidated by EUROCONTROL.

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