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FM30 FM EXCITER/TRANSMITTER TECHNICAL MANUAL CONTENTS 1 2 3 4 5 6 7 8 9 10 11 Introduction Safety, Electrical hazard Safety, Toxic hazard Unpacking Controls and Connectors Installation Block diagram Specifications Contacting sbs Technical Section Contents Declaration of conformity No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording or information storage and retrieval systems, for any purpose other than the purchaser's personal use, without the express written permission of sbs. Information in this document is subject to change without notice and does not represent a commitment on the part of sbs. sbs shall not be liable for any direct, indirect, consequential or incidental damages as a result of the use or misuse of this equipment, handbook or any related materials. FM 30 Series Technical Manual © sbs. Release 31 May 2001 Page 2 1 Introduction )))))))))))))))))))))))))))))))))) The FM30 is a top specification broadcast FM exciter that is also ideally suited as a low power stand alone transmitter. Featuring wideband design techniques, frequency adjustment is easily achieved by internally set direct reading dial switches - no further tuning is required. The FM30 uses the renowned sbs ultra linear modulator to give superb sound reproduction with freedom from overshoots and artifacts. It will operate into any load without damage thanks to its VSWR cut back circuit that protects the power amplifier stage from adverse operating conditions. The FM30 front panel metering shows forward and reflected power together with internal voltages and the modulation level. Additionally monitor points for both audio multiplex/composite input and RF output are provided. Quick-view status monitoring using dual colour LEDs indicate that PLL lock, forward power and reflected power are within a preset tolerance when green. The rear panel includes a remote control/monitoring socket that allows carrier muting and status signalling to an external system. Very conservatively rated components and a switch mode DC-DC converter are used to ensure extremely high reliability and to give good efficiency. The FM30 is in service with broadcasters worldwide and has been giving many years of trouble-free service. The FM30 is built, together with the MPX5 Stereo Encoder as a transmission system, to exceed the requirements of ETSI 300 384: January 1995, Radio broadcasting systems standard for VHF FM sound broadcasting transmitters, specifying equipment for radio transmission. FM 30 Series Technical Manual © sbs. Release 31 May 2001 Page 3 2 Safety, Electrical hazard )))))))))))))))))))))))))))))))))) This unit contains high voltages which could be fatal. YOU MUST ALWAYS ISOLATE THE UNIT FROM THE AC SUPPLY BY COMPLETELY DISCONNECTING IT BEFORE ATTEMPTING TO OPEN THE CASE. THIS EQUIPMENT MUST BE EARTHED. Do not expose this equipment to rain or any other source of water. In common wit