Pursuant to paragraph 25 of the FCCs Report and Order on a Radio Astronomy Coordination Zone in Puerto Rico, most applicants in the following services are required to coordinate their applications with NAIC: applicants for fixed or base stations below 15 GHz in Part 5,21,22,23,24,25,26,27,73,74,78,80,87,90,95,97, and 101. ... 5.70 Notification to the Arecibo Observatory. ... 1) The notification to the Interference Office, Arecibo Observatory shall be made prior to, or simultaneously with, the filing . ...

... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...