RES162 – 267 – 2 subject to justification resulting from studies conducted under resolves to invite ITU-R 1, sharing and compatibility studies with existing services, on a primary and secondary basis, including in adjacent bands as appropriate, to determine the suitability, including protection of fixed and mobile services, of new primary allocations to the FSS in the frequency band 51.4-52.4 GHz (Earth-to-space) limited to FSS feeder links for geostationary orbit use, and the possible associated regulatory actions; 3 studies towards possible revision of Resolution 750 (Rev.WRC-15) so that systems operating in the passive frequency band 52.6-54.25 GHz are protected; 4 studies regarding the protection of radio astronomy, as described in recognizing c), including regulatory measures, as appropriate, instructs the Director of the Radiocommunication Bureau to report on the results of the ITU-R studies to WRC-19, invites administrations to participate actively in these studies by submitting contributions to ITU-R.