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Crown FM250G, Руководство пользователя

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Rev A

FM250G User’s Manual

vi

Содержание FM250G

Страница 1: ...FM250G Broadcast Transmitter User s Manual 2002 Crown Broadcast a division of International Radio and Electronics Inc 25166 Leer Drive Elkhart Indiana 46514 5425 U S A 574 262 8900...

Страница 2: ...ted transcribed stored in a retrieval system or translated into any language in any form by any means without the written permission of Crown International Inc Printed in U S A Sony and RCA are tradem...

Страница 3: ...2 3 1 Modulation Compensator 2 5 2 3 2 RF Tuning Adjustments 2 5 2 4 Receiver Frequency Selection 2 6 2 5 RF Connections 2 8 2 6 Audio Input Connections 2 9 2 7 SCA Input Connections 2 10 2 8 Composit...

Страница 4: ...Pre Emphasis Selection 5 2 5 1 2 Pre Emphasis Fine Adjustment 5 2 5 2 Stereo Generator Adjustments 5 2 5 2 1 Separation 5 2 5 2 2 Composite Output 5 2 5 2 2 1 Using a Modulation Monitor 5 2 5 2 2 2 Us...

Страница 5: ...ion 5 8 5 20 Additional Checks 5 8 Section 6 Reference Drawings 6 1 Views 6 2 6 2 Board Layouts and Schematics 6 4 Audio Processor 6 5 Stereo Generator 6 7 RF Exciter 6 9 Metering 6 11 Motherboard 6 1...

Страница 6: ...Rev A FM250G User s Manual vi...

Страница 7: ...TION Section 1 Getting Acquainted This section provides a general description of the FM250G transmitter and introduces you to safety conventions used within this document Review this material before i...

Страница 8: ...procedure Simply select your operating frequency add an audio source attach an antenna and connect AC power and you re ready to broadcast Of course the FM series of transmitters also feature more soph...

Страница 9: ...er which you can expect The number portion of each name represents the maximum RF output power The FM250G for example can generate up to 250 watts of RF output power Suffix letters describe the config...

Страница 10: ...uration Crown transmitters have been used as booster transmitters Booster applications typically involve certain geographic factors which prevent your system from broadcasting to the full coverage are...

Страница 11: ...ransmitters In addition the module supplies a composite output to the RF exciter portion of the transmitter From here the signal is brought to full power by the built in power amplifier for retransmis...

Страница 12: ...s the rest shifting the frequency in a manner that is unnoticeable to the listener 1 2 7 Nearcasting Some Crown units function as nearcast transmitters Their low power output is not designed for broad...

Страница 13: ...0 dB 50 Hz 10 kHz 1 0 dB 10 kHz 15 kHz Exciter only 0 25 dB 50 Hz 15 kHz Distortion THD Noise Complete transmitter Less than 0 7 at 15 kHz Exciter only Less than 0 3 50 Hz 15 kHz Stereo Separation Com...

Страница 14: ...requency actual requirements for maximum voltage and current readings are 10 15 lower than stated Regulatory Meets CE and TUV requirements Dimensions 13 5 x 41 9 x 44 5 cm 5 25 x 16 5 x 17 5 inches We...

Страница 15: ...DANGER represents the most severe hazard alert Extreme bodily harm or death will occur if DANGER guidelines are not followed 1 5 2 Warnings WARNING represents hazards which could result in severe inju...

Страница 16: ...Rev A FM250G User s Manual I 1 10...

Страница 17: ...Installation 2 1 Section 2 Installation This section provides important guidelines for installing your transmitter Review this information carefully for proper installation fi...

Страница 18: ...ke any changes To operate the FM250G at 120 volts make the following changes To change the voltage setting perform the following steps 1 Disconnect the power cord if it is attached 2 Open the cover of...

Страница 19: ...nnect the AC power cord Illustration 2 1 Opening the Power Connector Cover Illustration 2 2 Removing the Voltage Selection red Assembly Input Power Fuze Size 120 VAC 10 ampere 240 VAC 4 ampere Table 2...

Страница 20: ...ge the setting See Illustration 2 3 Top Cover Removed and Illustration 2 4 RF Exciter Board Frequency Selector Switches 3 Use small flat blade screwdriver or another suitable device to rotate the swit...

Страница 21: ...nts All the RF stages are broadband to cover the 88 to 108 MHz broadcast band The RF amplifier stages require no tuning Note If you requested it the FSK chip on the RF Exciter Board has been pre progr...

Страница 22: ...the desired incoming frequency After setting the frequency return to Section 2 3 1 Modulation Compensator to set the modulation compensator Note If you requested it the FSK chip on the RF Exciter Boar...

Страница 23: ...B 95 1 2 4 100 1 3 D 105 1 5 6 90 2 8 B 95 2 A 4 100 2 B D 105 2 D 6 90 3 0 C 95 3 2 5 100 3 3 E 105 3 5 7 90 4 8 C 95 4 A 5 100 4 B E 105 4 D 7 90 5 0 D 95 5 2 6 100 5 3 F 105 5 5 8 90 6 8 D 95 6 A...

Страница 24: ...itor connection Information gained through this connection can supplement that which is available on the transmitter front panel displays If your transmitter is equipped with the receiver option conne...

Страница 25: ...ly the one connecting to pin 3 should be grounded to the shield at the source Audio will then connect to the line going to pin 2 By bringing the audio return line back to the program source the balanc...

Страница 26: ...generator To use the Crown transmitter as an RF Exciter only E version or when using the T version with composite input it is necessary to use the Composite Input section of the transmitter This will...

Страница 27: ...tional information 2 11 Processor Bypass Option You may bypass the audio processor in order to feed the left and right pre emphasized audio directly to the stereo generator The Normal Bypass slide swi...

Страница 28: ...4 Chassis Bottom View for board location 2 13 Remote I O Connector Remote control and remote metering of the transmitter is made possible through a 15 pin D sub connector on the rear panel No connecti...

Страница 29: ...volt 100 watts 8 Meter PA Volts 5 volts 50 VDC 9 Ext Enable Pull low to disable internal stereo generator and enable External Composite Input 10 a 38 kHz Out From stereo generator for power supply sy...

Страница 30: ...Rev A FM250G User s Manual 2 14...

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