Crown-FM30_FM150_FM300-bt-sm 电路图 维修手册.pdf

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1、FM30/FM150/FM300 Broadcast Transmitter Users Manual 2007 Crown Broadcast, a division of International Radio and Electronics Corporation 25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A. (574) 262-8900 RadioFans.CN 收音机爱 好者资料库 Revision Control Revision Print Date Initial Release March 2007 Importa

2、nt Notices 2007, Crown Broadcast, a division of International Radio and Electronics Corporation. Portions of this document were originally copyrighted by Michael P. Axman in 1994. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval syst

3、em, or translated into any language in any form by any means without the written permission of International Radio and Electronics, Inc. Printed in U.S.A. Crown Broadcast attempts to provide information that is accurate, complete, and useful. Should you find inadequacies in the text, please send you

4、r comments to the following address: International Radio and Electronics Corporation P.O. Box 2000 Elkhart, Indiana, 46515-2000 U.S.A. ii RadioFans.CN 收音机爱 好者资料库 Contents Section 1 Getting Acquainted 1-1 1.1 Your Transmitter 1-2 1.2 Applications and Options 1-3 1.2.1 Stand Alone 1-4 1.2.2 Backup 1-4

5、 1.2.3 Booster 1-4 1.2.4 Exciter 1-4 1.2.5 Translator 1-5 1.2.6 Satellator 1-6 1.2.7 Nearcasting 1-6 1.3 Transmitter/Exciter Specifications 1-7 1.4 Receiver Specifications 1-9 1.5 Safety Considerations 1-10 1.5.1 Dangers 1-10 1.5.2 Warnings 1-10 1.5.3 Cautions 1-10 Section 2 Installation 2-1 2.1 Ope

6、rating Environment 2-2 2.2 Power Connections 2-2 2.2.1 AC Line Voltage Setting 2-2 2.2.2 Fuses 2-5 2.2.3 Battery Power 2-5 2.3 Frequency (Channel) Selection 2-5 2.3.1 Modulation Compensator 2-7 2.4 Receiver Frequency Selection 2-7 2.5 RF Connections 2-10 2.6 Audio Input Connections 2-11 2.7 SCA Inpu

7、t Connections 2-12 2.8 Composite Input Connection 2-12 2.9 Audio Monitor Connections 2-13 2.10 Pre-emphasis Selection 2-13 2.11 Program Input Fault Time-out 2-14 2.12 Remote I/O Connector 2-14 iii RadioFans.CN 收音机爱 好者资料库 Section 3-Operation 3-1 3.1 Initial Power-up Procedures 3-2 3.2 Power Switches

8、3-4 3.2.1 DC Breaker 3-4 3.2.2 Power Switch 3-4 3.2.3 Carrier Switch 3-4 3.3 Front Panel Bar-Dot Displays 3-5 3.3.1 Audio Processor Input 3-5 3.3.2 Highband and Wideband Display 3-5 3.3.3 Modulation Display 3-5 3.4 Input Gain Switches 3-6 3.5 Processing Control 3-6 3.6 Stereo-Mono Switch 3-6 3.7 RF

9、Output Control 3-7 3.8 Digital Multimeter 3-7 3.9 Fault Indicators 3-8 Section 4-Principals of Operation 4-1 4.1 Part Numbering 4-2 4.2 Audio Processor Circuit 4-3 4.3 Stereo Generator Circuit 4-4 4.4 RF Exciter Circuit Board 4-6 4.5 Metering Circuit Board 4-8 4.6 Motherboard 4-9 4.7 Display Circuit

10、 Board 4-10 4.8 Voltage Regulator Circuit Board 4-11 4.9 Power Regulator Circuit Board 4-12 4.10 RF Driver/Amplifier (FM30) 4-12 4.11 RF Driver (FM150/FM300) 4-13 4.12 RF Amplifier (FM150/FM300 4-13 4.13 Chassis 4-14 4.14 RF Output Filter or flat Audio Response Conforms to 75 sec pre-emphasis curve

11、as follows: Complete Transmitter 0.30 dB (50 Hz10 kHz) 1.0 dB (10 kHz15 kHz) Exciter only 0.25 dB (50 Hz15 kHz) Distortion (THD + Noise) Complete Transmitter Less than 0.7% (at 15kHz) Exciter only Less than 0.3% (50Hz-15kHz) Stereo Separation Complete Transmitter Better than 40dB (50Hz-15kHz) Excite

12、r only Better than 40dB (50Hz-15kHz) Crosstalk Main into Sub, better than 40dB Sub into Main, better than 40dB Stereo Pilot 19 kHz 2 Hz, 9% modulation 1-7 Getting Acquainted Subcarrier Suppression 50dB below 75 kHz deviation FM S/N Ratio (FM noise) Complete Transmitter Better than 60dB Exciter only

13、Better than 70dB AM S/N Ratio Asynchronous and synchronous noise better than FCC requirements RF Bandwidth 120 kHz, better than 35 dB 240 kHz, better than 45 dB RF Spurious Products Better than 70dB Operating Environment Temperature (0C to 50C) Humidity (0 to 80% at 20C) Maximum Altitude (3,000 Mete

14、rs; 9834 Feet AC Power 100,120, 220, or 240 volts +10%/- 15%); 50/60Hz FM30 115VA FM150 297VA FM300 550VA DC Power FM30 24-36 volts (36 volts at 3 amps required for full output power) FM150 36-72 volts (48 volts 7 amps for full output power) FM300 36-72 volts (72 volts 10 amps for full output power)

15、 1-8 FM30/FM150/FM300 Users Manual Note: We set voltage and ampere requirements to assist you in designing your system. De- pending on your operating frequency, actual requirements for maximum voltage and current readings are 1015% lower than stated. Regulatory Type notified FCC parts 73 and 74 Meet

16、s FCC, DOC, and CCIR requirements Dimensions 13.5 x 41.9 x 44.5 cm 5.25 x 16.5 x 17.5 inches Weight FM30 10.5 kg (23 lbs) 13.6 kg (30 lbs) shipping weight FM150 11.4 kg (25 lbs) 14.5 kg (32 lbs) shipping weight FM300 16.8 kg (37 lbs) 20.0 kg (44 lbs) shipping weight 1-9 Getting Acquainted 1.4 Receiv

17、er Specifications Monaural Sensitivity (demodulated, de-emphasized) 3.5 V for signal-to-noise 50 dB Stereo Sensitivity (19kHz pilot frequency added) 31 V for signal-to-noise 50 dB Connector Standard type N, 50 Shipping Weight 1 lb 1.5 Safety Considerations Crown Broadcast assumes the responsibility

18、for providing you with a safe product and safety guidelines during its use. “Safety” means protection to all individuals who install, operate, and service the transmitter as well as protection of the transmitter itself. To promote safety, we use standard hazard alert labeling on the product and in t

19、his manual. Follow the associated guidelines to avoid potential hazard. 1.5.1 Dangers 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 injury or death.

20、 1.5.3 Cautions CAUTION indicates potential personal injury, or equipment or property damage if the asso- ciated guidelines are not followed. Particular cautions in this text also indicate unauthorized radio-frequency operation. Illustration 15 Sample Hazard Alert 1-10 FM30/FM150/FM300 Users Manual

21、Section 2Installation This section provides important guidelines for installing your transmitter. Review this information carefully for proper installation. 2-1 Installation 2.1 Operating Environment You can install the FM transmitter in a standard component rack or on a suitable surface such as a b

22、ench or desk. In any case, the area should be as clean and well ventilated as possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set the transmitter on a flat surface, install spacers on the bottom cover plate. If you install the transmitter in a rack, provi

23、de adequate clearance above and below. Do not locate the trans- mitter directly above a hot piece of equipment. 2.2 Power Connections The FM30, FM150, and FM300 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; sin- gle phase). Each transmitter can operate on DC power as well (28 volts for the

24、 FM30, 48 volts for the FM150, and 72 volts for the FM300). The transmitter can operate on fewer volts DC, but with reduced RF output power (see section 1.3). In addition, the transmitter isolates the AC and DC sources; both can be connected at the same time to provide battery backup in the event of

25、 an AC power failure. 2.2.1 AC Line Voltage Setting To change the voltage setting, follow these steps: 1. Disconnect the power cord if it is attached. 2. Open the cover of the power connector assembly using a small, flat blade screw driver. See Illustration 21. 3. Insert the screwdriver into the vol

26、tage selection slot and remove the drum from the as- sembly. 4. Rotate the drum to select the desired voltage. See Illustration 22. 5. Replace the drum and cover and check to see that the correct voltage appears in the connector window. 6. Connect the AC power cord. 2-2 FM30/FM150/FM300 Users Manual

27、 Illustration 21 Removing the Power Connector Cover Illustration 22 Selecting an AC Line Voltage 2-3 Installation 2.2.2 Fuses The fuse holders are located in the power connector assembly just below the voltage selec- tor. Illustration 23 Fuse Holder For 100 to 120 VAC operation, use the fuse install

28、ed at the factory. For 220 to 240 VAC op- eration, use the slow-blow fuse located in a hardware kit within the transmitter packaging. Consult the following table: Transmitter Input Power Fuse FM30 100120 V 3 A 220240 V 1.5 A FM150 100120 V 6.3 A 220240 V 4 A FM300 100120 V 12.5 A 220240 V 6.3 A Illu

29、stration 24 Fuse Reference Table 2-4 FM30/FM150/FM300 Users Manual 2.2.3 Battery Power Your transmitter can operate on a DC power source (such as 4 or 5, 12volt deep cycle bat- teries connected in series). The FM30 requires 28 volts DC for full output power, while the FM150 requires 48 volts, and FM

30、300 requires 72 volts for full output power. Connect the batteries to the red (+) and black () battery input binding posts on the rear panel. 2.3 Frequency (Channel) Selection Your transmitter is capable of operating between 87.9 and 107.9 MHz in the FM band. The transmitter can also operate between

31、 76 and 90 MHz by shorting pins 9 and 10 of J20 on the motherboard. (See illustration 2-6) To adjust the operating frequency, follow these steps: 1. Locate the frequency selector switches on the front panel which will be used to change the setting. See Illustrations 26 and 27. 25 Illustration DC Inp

32、ut Terminals 2-5 Installation 2.Use small flat blade screwdriver or another suitable device to rotate the switches to the desired setting. (The selected number will appear directly above the white indicator dot on each switch.) See examples of selected frequencies in the illustration below. 3. To ch

33、ange the operating band from 87.9-107.9MHz to 76-90MHz or vice versa, or to ad- just the modulation compensation pot, remove the top cover to gain access to these fea- tures. See illustrations 2-6 and 2-10. Illustration 26 Top Cover Removed Megahertz .1 Illustration 27 Transmitter Front Panel (Frequ

34、ency Selector Switches) = 88.10 MHz = 107.90 MHz Illustration 28 Two Sample Frequency Selections 2-6 FM30/FM150/FM300 Users Manual .01 2.3.1 Modulation Compensator The Modulation trim-potentiometer (see illustration 210) compensates for slight variations in deviation sensitivity with frequency. Set

35、the trim-pot dial according to the following graph: Modulation Compensation Pot Setting Illustration 29 Modulation Compensator Settings These compensator settings are approximate. Each mark on the potentiometer represents about 1.8% modulation compensation. Illustration 210 Modulation Compensator Pot 2-7 Installation Frequency of Operation (MHz) 108 0 106 10 104 15 102 25 100 35 98 40 97.1 45 96 55 94 60 92 70 90 75 88 80 86 80 84 80 82.4 70 82 65 80 55 78 30 76 0 2.4 Receiver Frequency Selection If you have