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Subcarrier Suppression                                           

50dB below ±75 kHz deviation  

 

FM S/N Ratio 

(FM noise) 

                                      
            Complete Transmitter                                     Better than –60dB 
 
            Exciter only                                                     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 (0

°C to 50°C) 

 

                                                                         

Humidity (0 to 80% at 20°C) 

 

                                                                         

Maximum Altitude (3,000 Meters; 

                                                                                     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) 

1-8 

FM30/FM150/FM300 User’s Manual 

Содержание FM150

Страница 1: ...FM30 FM150 FM300 Broadcast Transmitter User s 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...

Страница 2: ...may be reproduced transmitted transcribed stored in a retrieval system or translated into any language in any form by any means without the written permission of International Radio and Electronics I...

Страница 3: ...5 2 Warnings 1 10 1 5 3 Cautions 1 10 Section 2 Installation 2 1 2 1 Operating 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 F...

Страница 4: ...ontrol 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 Exci...

Страница 5: ...5 5 4 2 Power Set 5 5 5 4 3 SWR Calibrate 5 5 5 4 4 PA Current Limit 5 6 5 5 Motherboard Adjustments 5 6 5 6 Display Modulation Calibration 5 6 5 7 Voltage Regulator Adjustment 5 6 5 8 Bias Set RF Pow...

Страница 6: ...ings 6 1 6 1 Views 6 2 6 2 Board Layouts and Schematics 6 4 Section 7 Service and Support 7 1 7 1 Service 7 2 7 2 24 Hour Support 7 2 7 3 Spare Parts 7 2 Transmitter Output Efficiency Appendix 1 Gloss...

Страница 7: ...ction provides a general description of the FM30 FM150 and FM300 transmitters and introduces you to safety conventions used within this document Review this material before installing or operating the...

Страница 8: ...s and monitoring connections if needed Reliability is a Crown tradition The first Crown transmitters were designed for rigors of worldwide and potentially portable use The modular design quality compo...

Страница 9: ...output power which you can expect The number portion of each name represents the maximum RF output power The FM300 for example can generate up to 300 watts of RF output power Suffix letters describe...

Страница 10: ...ter audio processor or amplifier Transfer switches on each side of the existing and backup transmitters make the change over possible with minimal downtime The DC operation option of the FM30 FM150 an...

Страница 11: ...lator This option enables RF in and RF out on any of Crown s FM series of transmitters In addi tion the module supplies a composite output to the RF exciter portion of the transmitter From here the si...

Страница 12: ...the listener The FSK IDer module should be ordered at the time you order your transmitter but is available separately factory programmed for your installation Illustration 1 4 Transmitter with FSK IDe...

Страница 13: ...or 10 dBm to 10 dBm for 75 kHz deviation at 400 Hz Pre emphasis Selectable for 25 50 or 75 sec or flat Audio Response Conforms to 75 sec pre emphasis curve as follows Complete Transmitter 0 30 dB 50 H...

Страница 14: ...er than 45 dB RF Spurious Products Better than 70dB Operating Environment Temperature 0 C to 50 C Humidity 0 to 80 at 20 C Maximum Altitude 3 000 Meters 9834 Feet AC Power 100 120 220 or 240 volts 10...

Страница 15: ...rrent readings are 10 15 lower than stated Regulatory Type notified FCC parts 73 and 74 Meets 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...

Страница 16: ...the transmitter itself To promote safety we use standard hazard alert labeling on the product and in this manual Follow the associated guidelines to avoid potential hazard 1 5 1 Dangers DANGER repres...

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

Страница 18: ...8 volts for the 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 isolat...

Страница 19: ...Illustration 2 1 Removing the Power Connector Cover Illustration 2 2 Selecting an AC Line Voltage 2 3 Installation...

Страница 20: ...installed 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 1...

Страница 21: ...y 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 76 a...

Страница 22: ...ration below 3 To change 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 illust...

Страница 23: ...Modulation Compensation Pot Setting Illustration 2 9 Modulation Compensator Settings These compensator settings are approximate Each mark on the potentiometer represents about 1 8 modulation compensat...

Страница 24: ...llustration 2 11 Receiver Module Switches 2 Use the adjacent chart to set the switches for the desired incoming frequency 3 For frequencies in the Japan FM band short pins 7 8 on J1 on the receiver ca...

Страница 25: ...5 93 5 1 C 76 6 89 6 8 8 80 6 93 6 9 C 76 7 89 7 0 9 80 7 93 7 1 D 76 8 89 8 8 9 80 8 93 8 9 D 76 9 89 9 0 A 80 9 93 9 1 E 77 0 90 0 8 A 81 0 94 0 9 E 77 1 90 1 0 B 81 1 94 1 1 F 77 2 90 2 8 B 81 2 94...

Страница 26: ...8 1 101 1 4 2 84 5 97 5 3 0 88 2 101 2 C 2 84 6 97 6 B 0 88 3 101 3 4 3 84 7 97 7 3 1 88 4 101 4 C 3 84 8 97 8 B 1 88 5 101 5 4 4 84 9 97 9 3 2 88 6 101 6 C 4 85 0 98 0 B 2 88 7 101 7 4 5 85 1 98 1 3...

Страница 27: ...107 7 6 3 X 104 1 5 1 X 107 8 E 3 X 104 2 D 1 X 107 9 6 4 X 104 3 5 2 X 108 0 E 4 X 104 4 D 2 X 104 5 5 3 X 104 6 D 3 X 104 7 5 4 X 104 8 D 4 X 104 9 5 5 X 105 0 D 5 X 105 1 5 6 X 105 2 D 6 X 105 3 5...

Страница 28: ...tter The RF monitor is intended primarily for a modulation monitor connection Information gained through this connection can supplement that which is available on the transmitter front panel displays...

Страница 29: ...an unbalanced program source one line preferably 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 Illustration 2 14 XLR Au...

Страница 30: ...o audio directly to the RF exciter bypassing the in ternal audio processor and stereo generator To use the Crown transmitter as an RF Exciter only E version or when using the T version with composite...

Страница 31: ...d for doing audio testing De emphasis is normally set for 75 sec set to 50 sec by moving jumpers HD201 and HD202 on the Audio Processor Stereo Generator board 2 10 Pre emphasis Selection Select the pr...

Страница 32: ...s 1 and 2 the two pins closest to the edge of the board for a delay of approximately 30 seconds pins 3 and 4 for a 2 minute delay pins 5 and 6 for a 4 minute delay and pins 7 and 8 for an 8 minute del...

Страница 33: ...his pin low will slowly lower the RF output 11 Remote SWR A buffered metering output with a calculated reading of standing wave ratio in VDC 12 External ALC Control 13 No Connection 14 Ext Enable Pull...

Страница 34: ...Notes 2 18 FM30 FM150 FM300 User s Manual...

Страница 35: ...Section 3 Operation This section provides general operating parameters of your transmitter and a detailed description of its front panel display 3 1 Operation...

Страница 36: ...es you should use for the initial operation of the transmitter More detailed information follows 1 Turn on the DC breaker Illustration 3 1 DC Breaker 2 Turn on the main power switch Illustration 3 2 F...

Страница 37: ...tch C ALC should be between 4 00 and 6 00 volts D PA DC Volts should be 26 30 volts for the FM30 25 35 volts for the FM150 and 37 52 volts for the FM300 Varies with antenna match power and frequency E...

Страница 38: ...0 VAC and the DC battery power in put 3 2 3 Carrier Switch This switch controls power to the RF amplifiers and supplies a logic high to the voltage regulator board which enables the supply for the RF...

Страница 39: ...cators determined by the program source level and Input Gain switches the transmitter will be fully modulated See section 3 4 The Wideband indicator shows short term syllabic rate expansion and gain r...

Страница 40: ...ste For most program material a setting in the range of 40 to 70 provides good program density For the classical music purist who might prefer preservation of music dynamics over density 10 to 40 is a...

Страница 41: ...elect one of the following pa rameters A green LED indicates the one selected Illustration 3 5 Digital Multimeter RF Power Actually reads RF voltage squared so the accuracy can be affected by VSWR RF...

Страница 42: ...is reduced to limit the reflected RF power Lock Frequency synthesizer phase lock loop is unlocked This indicator normally blinks for about five seconds at power turn on Whenever this light is blinkin...

Страница 43: ...ection discusses the circuit principles upon which the transmitter functions This information is not needed for day to day operation of the transmitter but may be useful for advanced users and service...

Страница 44: ...component placement drawings use designators such as R1 R2 and C1 These same designators are used throughout the transmitter on several different circuit boards and component placement drawings When...

Страница 45: ...tter goes to instrument amplifier U2 U8 Two bit binary data on the 6 dB and 12 dB control lines sets the gain of U2 U8 to one of four levels in 6 dB steps Gain of U2 is determined by R5 R6 or R7 R45 R...

Страница 46: ...rocess ing however shifts the pre emphasis curve rather than affecting overall gain Peak audio voltages are compared to plus and minus 5 volt reference voltages at the outputs of U19A and U19B This sa...

Страница 47: ...and B generate the 19 kHz pilot subcarrier U211 is a dual switched capacitor filter configured as second order low pass filters each one with a Q of 5 The 38 and 19 kHz outputs of pins 1 and 20 respe...

Страница 48: ...chip U13 U13 is a phase locked loop frequency synthesizer IC The 10 24 MHz from the crystal oscillator is divided to 10 kHz Internal programmable dividers divide the 87 108 MHz RF to 10 kHz Differenc...

Страница 49: ...ng Circuit U23A U23B and U24A with their respective diodes are diode linearity correction circuits Their DC inputs come from diode detectors in the RF reflectometer in the RF low pass filter compartme...

Страница 50: ...exciter and Metering circuits are an integral part of the motherboard and are no longer separate boards as in past transmitter designs Also contained on the motherboard is the 5 00 volt reference and...

Страница 51: ...Open Z16 Open Open Open Open Open Open Z17 Open Open Open Open Open Open Z18 Open Open Open Open Open Open Z19 Open Open Open Open Open Open Z20 Open Open Open Open Open Open Z21 Open Open Open Open O...

Страница 52: ...n has been im proved using dither enhancement With dither the brightness of the LED is controlled by proximity of the input voltage relative to its voltage threshold The effect is a smooth transi tion...

Страница 53: ...e The speed of the turn off is set by C13 U6 is a switching regulator for both 12 volts and 12 volts It runs at about 52 kHz Energy for 12 volts is taken from inductor L2 during the off portion of the...

Страница 54: ...to Q1 is turned off This happens on a cycle by cycle basis The speed of the turnoff is set by C5 U3 and Q2 are used in a circuit to convert the current that flows through metering shunt R19 into a cu...

Страница 55: ...plate Access the connections to the module by removing the bottom cover of the unit The RF connections to the amplifier are BNC for the input and out put Power comes into the module through a 5 pin he...

Страница 56: ...Filter Reflectometer The RF low pass filter reflectometer are located in the right hand compartment on the top of the chassis See Illustration 6 13 and accompanying schematic for more information A n...

Страница 57: ...the receiver board Very strong signals can be attenuated 20 dB automatically by placing the jumper on the left two pins LO position An additional 20 dB attenuation is also available with the jumpers i...

Страница 58: ...n the signal that goes through the transmitter The power supply is fairly straight forward The incoming 12 volt supply goes to a 7809 9 volt regulator VR1 which supplies all 9 volt needs on the board...

Страница 59: ...cedures for 1 advanced users who may be interested in customizing or optimizing the performance of the transmit ter and 2 service personnel who want to return the transmitter to op erational status fo...

Страница 60: ...of 400 Hz At the proper setting 15 0 kHz will be down about 0 7 dB When making these adjustments it is important that you keep signal levels below the proc essor gain control threshold A preferred me...

Страница 61: ...th Mono and Stereo that modulation peaks are between 95 and 100 5 2 3 19 kHz Level Adjust the 19 kHz pilot for 9 modulation as indicated on an FM modulation monitor The composite output should be set...

Страница 62: ...his will shift the operating frequency Adjust R224 for an offset of the operating frequency of about 6 kHz Un grounding pin 4 will cause the operating frequency to return to normal Use one of two meth...

Страница 63: ...limit of 7 35 amps adjust the PA Current Limit control for 0 7 volts at R186 or 0 565 volts for 6 0 amps Set the current limit for 4 amps FM50 7 amps FM150 or 9 5 amps FM300 5 5 Motherboard Configura...

Страница 64: ...rmation 1 Short pins 1 and 2 for a 30 second delay 2 Short pins 3 and 4 for a 2 minute delay 3 Short pins 5 and 6 for a 4 minute delay 4 Short pins 7 and 8 for an 8 minute delay You may select other t...

Страница 65: ...References to 100 modulation assume 9 pilot and 91 for the remainder of the com posite stereo signal Because the audio processing threshold is at 90 modulation it is not possible to make audio proof o...

Страница 66: ...73 317 1 Emissions more than 600 kHz from the carrier are at least 43 10log power in watts dB down 58 dB for 30 watts 65 dB for 150 watts 68 dB for 300 watts The scan should include the tenth harmoni...

Страница 67: ...and right into left stereo separation measurements with an FM modula tion monitor for frequencies of 50 Hz 100 Hz 400 Hz 1 kHz 5 kHz 10 kHz and 15 kHz 5 19 Crosstalk For stereo crosstalk measurements...

Страница 68: ...ll indicators function 4 Check the frequency synthesizer lock at 80 MHz and 110 MHz 5 Measure the AC line current with and without the carrier on 6 Perform a functional test of the SCA input Monitor o...

Страница 69: ...on 6 Reference Drawings The illustrations in this section may be useful for making adjustments taking measurements troubleshooting or understanding the circuitry of your transmitter 6 1 Reference Draw...

Страница 70: ...nal SCA Inputs Composite Input Remote I O Audio Monitors Audio Inputs Audio Processor Input Level Indicators Input Gain Switches Processing Control Frequency Selector Switches Stereo Mono Switch RF Ou...

Страница 71: ...e Rectifier Filter Capacitor AC Power Transformer AC Power Entry 6 3 Adjustments and Tests Illustration 6 4 Chassis Bottom View Audio Processor Section Stereo Generator Section Metering Circuit RF Low...

Страница 72: ...6 4 Notes FM30 FM150 FM300 User s Manual...

Страница 73: ...Illustration 6 5 Audio Processor Stereo Generator Board 6 2 Board Layout and Schematics 6 5 FM30 FM150 FM300 User s Manual...

Страница 74: ...PROC A J3 16 PROC C J3 20 TO R50 ON DISPLAY BD HEAVY LIGHT R101 1 0K C23 1uF R100 10M R102 10 0K R95 3 0K VT NC 1 Vin 2 NC 3 GND 4 TRIM 5 Vout 6 NC 7 NC 8 U18 REF02 3 2 1 8 4 U19A NE5532 5 6 7 U19B N...

Страница 75: ...216 0 1uF 12 13 11 U210D 74HC86 9 10 8 U210C 74HC86 R240 24K R241 10K 4 5 6 U210B 74HC86 1 2 3 U210A 74HC86 R242 120K R243 49 9K C216 0 1uF CLR 12 CKA 13 QA 11 QB 10 QC 9 QD 8 U209B 74HC393 9 8 U207D...

Страница 76: ...FM30 150 300 User s Manual Board Layouts and Schematics Illustration 6 6 Motherboard Adjustments and Tests 6 8...

Страница 77: ...20 J12 HEADER 10 x 2 ALC ALC ALC ALC ALC FAN TP4 12V 12V TP3 12V 12V TP5 5 00V 5 00V TP7 GND 2 3 1 U1A TL072 C24 1 0 12V C25 1 0 12V R32 24 9K 1 R34 24 9K 1 R36 24 9K 1 R35 24 9K 1 Z11 OPEN EXT RTN Z1...

Страница 78: ...5A 74HC14 3 4 U25B 74HC14 5 6 U25C 74HC14 R220 10K R196 10K R219 51K R217 100K R218 10K R185 200K R184 1K R156 100K R155 11K R191 51K R152 100K R190 100K R136 1K R171 100K R170 24 9K R149 100 R182 80...

Страница 79: ...39 1 2 3 4 5 6 7 8 VCO1 POS 150 DS3 AMBER 1 2 3 4 5 6 7 8 9 10 J20 HEADER 5X2 R97 OPEN R120 1 0K C89 33pF NPO R106 10 C73 001 C103 001 C104 1 C107 001 POLY R98 100K R105 100K R114 100K R111 100K R99...

Страница 80: ...CM DATE DWN REVISION HISTORY A_P_SHT1_A DOT REV A INTERNATIONAL RADIO AND ELECTRONICS CORP 25166 LEER DRIVE ELKHART IN 46514 574 262 8900 WWW IREC1 COM IREC SIZE A 1 2 3 4 5 SW1 1 2 3 4 5 SW3 1 2 3 4...

Страница 81: ...Illustration 6 9 FM Display Board 6 13 FM30 FM150 FM300 User s Manual...

Страница 82: ...V 2 V 3 DLO 4 IN 5 DHI 6 ROUT 7 RADJ 8 MODE 9 L10 10 L9 11 L8 12 L7 13 L6 14 L5 15 L4 16 L3 17 L2 18 U2 LM3915 R3 1K DL44 RED DL45 RED R2 100K DL46 RED R1 68K DL47 RED DL59 RED R4 1 2K R VU 12V 5 00V...

Страница 83: ...Illustration 6 10 FM Voltage Regulator 6 15 FM30 FM150 FM300 User s Manual...

Страница 84: ...K R26 100K R48 10 0K R27 620 0 R49 1 5K 1 2 3 4 5 6 HD1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 HD2 HEADER 10X2 1 2 3 HD3 1 2 3 4 5 6 HD4 HEADER 6 VDD VDD D9 OPEN 12V 12V CARR SW DRVR V R51...

Страница 85: ...Illustration 6 11 FM Power Regulator 6 17 FM30 FM150 FM300 User s Manual...

Страница 86: ...7 4 U803 OP 27GNB Q802 MPSA56 R814 22 0K Q803 2N5087 R822 22 0K R816 1 0K 1 R813 1 0K R815 100 0 R819 04 OHM 15W 3 R817B 2K R817A 100 C1001 0 015F C802 2200PF POLY C801 220PF C814 1 50V C804 01 C803 5...

Страница 87: ...R19 Illustration 6 12 FM Power Amplifier FM150 FM300 6 19 FM30 FM150 FM300 User s Manual...

Страница 88: ...VISION HISTORY 6 5 SIZE B B_L_SHT1_A DOT REV A INTERNATIONAL RADIO AND ELECTRONICS CORP 25166 LEER DRIVE ELKHART IN 46514 574 262 8900 WWW IREC1 COM IREC 1 2 3 R11 10K R12 5 6 R13 5 6 R14 5 6 R15 5 6...

Страница 89: ...Illustration 6 13 FM Low Pass Filter 2 6 21 FM30 FM150 FM300 User s Manual...

Страница 90: ...RP 25166 LEER DRIVE ELKHART IN 46514 574 262 8900 WWW IREC1 COM IREC J1 RF IN J2 BNC C1A 10pF C1 15 4pF C3 40 9pF C5 38 9pF C7 37 7pF C9 14 1pF C10 2pF C19 47pF C12 47pF NPO C13 0 001uF C14 0 01uF C15...

Страница 91: ...Illustration 6 14 FM RF Driver 6 23 FM30 FM150 FM300 User s Manual...

Страница 92: ...4 10 4uH L5 23 2uH C14 27pF J2 RF OUT C9 OPEN R11 4 7K R9 51 C17 0 01 24VDC C16 0 01 C18 OPEN 1 2W 3 2 1 8 4 U2A OPEN 5 6 7 U2B OPEN R15 OPEN R14 OPEN G S D 1 J3 1 J4 R13 OPEN R12 OPEN R8 D3 1N753A 6...

Страница 93: ...REFERENCE ONLY APPROVALS DWN CHK CM PE DISTRIBUTION K 1 2 3 4 5 6 D A A C B D 1 3 4 5 6 A SIZE 2 A_L_SHT1_A DOT REV A INTERNATIONAL RADIO AND ELECTRONICS CORP 25166 LEER DRIVE ELKHART IN 46514 574 262...

Страница 94: ...MP 1 2 3 4 5 PL1005 PL1001 BNC TO MOTHER BOARD FAN RF OUT PA FAN RF IN RF DRIVER VOLTAGE REGULATOR x x x HD503 20 C0ND RIBBONCBL 1 2 3 HD703 x x x HD702 20 C0ND RIBBONCBL 1 2 3 4 5 6 HD701 HEADER 6 1...

Страница 95: ...d Support We understand that you may need various levels of support or that the product could require servicing at some point in time This section pro vides information for both of these scenarios Ser...

Страница 96: ...lude it with your re turned product 7 2 24 Hour Support In most instances what you need to know about your product can be found in this manual There are times when you may need more in depth informati...

Страница 97: ...y repair can only be performed at our plant facility in Elkhart Indiana USA or at a factory authorized service depot Expenses in remedying the defect will be borne by Crown Broad cast including two wa...

Страница 98: ...te Driver 500V IR IR2125 2 BLF245 FET PWR Transistor 1 Switching Regulator 0 75A LM3578AN 2 NTC In rush Current Limiter 2 EMI Filter 6A 250V with Fuse 1 14 Stage Bin Cntr OSC 74HC4060 1 Item Quantity...

Страница 99: ...ll reimburse We do not cover any charges for shipping outside the U S or any of the expenses involved in clearing customs If you have any questions about your Crown Broadcast product please contact Cr...

Страница 100: ...62 17 0 1 56 17 64 14 1 1 34 14 74 12 6 1 22 10 65 10 5 1 04 7 64 8 8 88 5 65 6 6 65 3 70 5 4 53 2 70 Power measurements were made at 97 1 MHz Voltage and current measurements were taken from the unit...

Страница 101: ...the internal metering is better than 2 Return loss of the RF load was greater than 34 dB at test frequency RF Power Output FM 300 PADC Volts PADC Amps RF Power Efficiency 48 5 7 86 330 86 6 46 3 7 57...

Страница 102: ...Notes FM30 FM150 FM300 User s Manual A 3...

Страница 103: ...Glossary The following pages define terms and abbreviations used throughout this manual Glossary G 1...

Страница 104: ...inuous signal which is modulated with a second information carrying signal Crosstalk In FM broadcasting the term generally refers to the interaction between the main L R and the subcarrier L_R signals...

Страница 105: ...affected by the pre emphasis I O Input Output LED Light Emitting Diode Modulation The process by which a carrier is varied to represent an information carrying signal MOSFET Metal Oxide Semiconductor...

Страница 106: ...r A carrier signal which operates at a lower frequency than the main carrier frequency and which modulates the main carrier Suppression The process used to hold back or stop certain frequencies SWR St...

Страница 107: ...roadband See Audio broadband C Cables audio input 2 13 Carrier 4 12 5 8 automatic turnoff 2 16 3 8 5 6 5 10 frequency 5 8 5 10 Carrier switch 3 4 5 5 Channel See Frequency main 5 10 main into sub 5 10...

Страница 108: ...5 4 Front panel display modulation calibration 5 5 FSK 1 5 1 6 measurements 5 4 Fuses 2 4 7 4 G Gain control 3 5 Gain reduction 4 3 Gain switches input 3 6 H Harmonic distortion 4 5 Harmonics 5 8 Hea...

Страница 109: ...ransformer 4 14 Power switch 3 4 Pre emphasis 1 7 4 4 5 2 5 7 curve 2 15 4 4 Processing audio 1 2 3 5 control 3 6 control setting 3 3 highband 3 5 4 4 Program failure 2 16 5 10 Program source 2 13 3 6...

Страница 110: ...brate 5 5 fault 3 8 Synchronization 4 11 Synthesizer See RF exciter T Temperature fault 3 8 operating range 1 8 5 10 PA 3 3 3 8 Test point voltage 3 8 Tests performance 5 7 5 10 Time out program input...

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