CONTENTS 



I . Introduction 47 



II. Equipment needed for a typical DCS 



direct readout station 48 



III . DCS signal power 51 



IV. Antenna/receiver considerations 54 



V. Demodulator/decoder 57 



VI . Frame synchronizer 63 



VII. Data processing equipment 63 



VIII. Obtaining a direct readout receiving 



station 63 



IX. Costs 63 



APPENDIX A. Per-channel signal energy as a function of 

 the number of active channels 



APPENDIX B. Calculation of the phase modulation introduced 

 by the switched array antenna 



46 



