02/06/2018             ***** U N C L A S S I F I E D *****





                          Radio Frequency Authorization



    This Authorization is granted pursuant to Chapter 1 Part 1.1 Section 6.i of the NTIA

    Manual by authority of the US National Science Foundation.

    This Authorization expires on:  January 22, 2023.  For continued use of this equipment,

    YOU MUST SUBMIT a request to your Frequency Manager by October 24, 2022.





    Serial Number        FOI    MSD    BUR    NET      RVD      AUS        EXD

    NSF 180001                         NAIC            180205   J1388469   230122



    FRQ           BIN  TME   SPD    STC       Bandwidth         Emission   Power

    5130 kHz                        XR        100.00 kHz        A3N        600 kW

                                    XR        100.00 kHz        F3N        600 kW

                                    XR        100.00 kHz        P3N        600 kW



    XAL, XSC                        XRC       XLA, XLG          XCL        XAP    XAZ

    ARECIBO, PR                               182037N0664511W



    XAD

    23G



    RAL, RSC                        RRC       RLA, RLG          ACL        RAP    RAZ

    ARECIBO, PR                     I,NTIA-U  182037N0664511W



    RAD                             Remarks

    23G                             *EQT,C,CCP OT139FPS118

                                    *POC,ANGEL VAZQUEZ,7878782612,130318

                                    *EQR,U,NSF CUSTOM



    Restrictions (NTS, *NTS, SUP)

    S070 - SUBJECT TO IMMEDIATE CANCELLATION UPON NOTICE FROM FCC.



    Supplementary Details -  EXPERIMENTAL HF IONOSPHERIC HEATER FACILITY USED FOR THE STUDY

    OF PLASMA PHYSICS IN THE EARTHS IONOSPHERE. EXPERIMENTS ARE CONDUCTED INFREQUENTLY,

    USUALLY A FEW TIMES PER YEAR. CHANNEL WILL BE MONITORED BEFORE TRANSMITTING TO AVOID

    INTERFERENCE. ANTENNA IS A 305 M DISH THAT ANTENNA BEAMWIDTH LESS THAN 15 DEG.

    EXPERIMENTS SUPPORT IMPROVEMENTS IN SCIENCE OF RADIO PROPAGATION. CURRENTLY ANTENNA ONLY

    POINTS STRAIGHT UP,  BUT WILL POINT WITHIN 45 DEGREES OF VERTICAL.



    SPECIAL HANDLING INSTRUCTIONS



    None.





























                             ***** U N C L A S S I F I E D *****