Switzerland and the Principality of Liechtenstein
Radio Interface Regulation

784.101.21 / RIR10041)
Radiodetermination applications

Obstacle detection radars for rotorcraft use
76 - 77 GHz
30 dBm peak e.i.r.p / 56 %/s DC.
Edition 1.0 / 01.04.2019

Nr Parameter2)DescriptionComments
1Radiocommunication service--
2ApplicationRadiodetermination applicationsFor obstacle detection radars for rotorcraft use. Use is not possible in specific areas of some European countries due to exclusion zones implementation around RAS observatories.
The system shall inhibit sensor transmission during cruise flight phase or when flying inside a RAS exclusion zone included in ECC Decision (16)01 Annex 2.
3Frequency band76 - 77 GHz-
5Modulation / Occupied bandwidth--
6Direction / Separation--
7Transmit power / Power density30 dBm peak e.i.r.p. and 3 dBm/MHz average power spectral density.-
8Channel access and occupation rulesRF power duty cycle per second ≤ 56 %.In case of life-saving missions, the obstacle detection radar devices may be used without protecting the radio astronomy sites (RAS), only on decision by the pilot on case by case basis and by activation from the pilot pursuant Article 4.9 of the ITU Radio Regulations.
RAS exclusion zones according to the ECC Decision (16)01 Annex 2 should be updated regularly.
9Authorisation regimeSwitzerland: License exempt.
Liechtenstein: General authorisation.
Operation on NIB / NPB. (Non interference basis / non protection basis).
10Additional essential requirements--
11Frequency planning assumptionsECC/DEC/(16)01, Annex 1, EN 303 360.-
12Planned changes--
13ReferenceEN 303 360 / ECC/DEC/(16)01 / ERC/REC 70-03, Annex 5.Effective use of spectrum / ECC Decisions / ECC Recommendations.
14Notification number2019/9501/CH
15RemarksECC Report 222-

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