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Crown FM600 User Manual

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FM600 Broadcast Transmitter
User's Manual
©2008 Crown Broadcast, a division of
International Radio and Electronics Corporation
25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A. (574) 262-8900

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  • Page 1 FM600 Broadcast Transmitter User's Manual ©2008 Crown Broadcast, a division of International Radio and Electronics Corporation 25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A. (574) 262-8900...

  • Page 2: Important Notices

    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 your comments to the following address: International Radio and Electronics Corporation P.O.

  • Page 3: Table Of Contents

    Contents Section 1– Getting Acquainted Your Transmitter Applications and Options 1.2.1 Stand Alone 1.2.2 Backup 1.2.3 Exciter 1.2.4 Translator 1.2.5 Satellator Transmitter/Exciter Specifications Receiver Specifications Safety Considerations 1.5.1 Dangers 1.5.2 Warnings 1.5.3 Cautions Section 2– Installation Operating Environment Power Connections 2.2.1 AC Line Voltage Setting 2.2.2 Fuses Frequency (Channel) Selection...
  • Page 4 Section 3-Operation Initial Power-up Procedures Power Switches 3.2.1 Power Switch 3.2.2 Carrier Switch Front Panel Bar-Dot Displays 3.3.1 Audio Processor Input 3.3.2 Highband and Wideband Display 3.3.3 Modulation Display Input Gain Switches Processing Control Stereo-Mono Switch RF Output Control Digital Multimeter Fault Indicators Section 4-Principals of Operation Part Numbering...
  • Page 5 Section 5-Adjustments and Tests Audio Processor Adjustments 5.1.1 Pre-Emphasis Selection 5.1.2 Pre-Emphasis Adjustment Stereo Generator Adjustments 5.2.1 Separation 5.2.2 Composite Output Using a Modulation Monitor 5.2.3 19kHz Level 5.2.4 19kHz Phase Frequency Synthesizer Adjustments 5.3.1 Frequency (Channel) Selection 5.3.2 Modulation Compensator 5.3.3 Frequency Measurement and Adjustment 5.3.4 FSK Frequency Offset Control Metering Board Adjustments...
  • Page 6 Section 6-Reference Drawings Views Board Layouts and Schematics Section 7-Service and Support Service 24-Hour Support Transmitter Output Efficiency Appendix-1 Glossary Index Index-1...

  • Page 7: Section 1-Getting Acquainted

    Section 1—Getting Acquainted This section provides a general description of the FM600 transmitter and introduces you to safety conventions used within this document. Review this material before installing or operating the transmitter. Getting Acquainted...

  • Page 8: Your Transmitter

    1.1 Your Transmitter The FM600 is a member of a family of FM stereo broadcast transmitters. Crown transmitters are known for their integration, ease-of-use, and reliability. The integration is most apparent in the standard transmitter configuration which incorporates audio processing, stereo generation, and RF amplification without compromised signal quality.

  • Page 9: Applications And Options

    Model numbers describe the configuration of the product (which has to do with its intended purpose) and the RF output power which you can expect. The number portion of each name represents the maximum RF output power. The FM600, for example, can generate up to 600 watts of RF output power.

  • Page 10: Stand Alone

    1.2.1 Stand-Alone In the standard configuration, the FM600 is an ideal stand-alone transmitter. When you add an audio source (monaural, L/R stereo, or composite signal), an antenna, and AC power, the transmitter becomes a complete FM stereo broadcast station, capable of serving a community.

  • Page 11: Translator

    1.2.4 Translator A receiver configuration (FM600R, for example) replaces the audio processor/stereo generator board with a receiver module. This added feature makes the FM600 ideal for translator service in terrestrial-fed networks. These networks represent a popular and effective way to increase your broadcasting coverage.

  • Page 12: Satellator

    One additional option is available for all configurations—an FSK Identifier (FSK IDer). This added feature enables the FM600 to transmit its call sign or operating frequency in a Morse code style. This option is intended for use in satellite-fed networks. Transmitters equipped in this fashion are often known as "satellators."...

  • Page 13: Transmitter/Exciter Specifications

    1.3 Transmitter/Exciter Specifications 87.9 MHz–107.9 MHz (76 MHz–90 MHz Frequency Range optionally available) (VSWR 1.7:1 or better) RF Power Output FM600 Up to 660 watts output 50 Ohms RF Output Impedance Meets FCC specifications from 0-50 Frequency Stability degrees C 50k Ω...
  • Page 14 Dimensions 12.75 x 23.5 x 24.5 Inches 38 lbs Weight 17.237 Kg *200 volts AC input or greater, recommended for RF power output of 575W or greater. Voltage measured at the AC power input connector to transmitter. FM600 User’s Manual...

  • Page 15: Receiver Specifications

    1 lb 1.5 Safety Considerations Crown Broadcast assumes the responsibility 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 this manual.
  • Page 16 Notes 1-10 FM600 User’s Manual...

  • Page 17: Section 2-Installation

    Section 2—Installation This section provides important guidelines for installing your transmitter. Review this information carefully for proper installation. Installation...

  • Page 18: Operating Environment

    Do not locate the transmitter directly above a hot piece of equipment. 2.2 Power Connections The FM600 can operate on any voltage between 120 and 240 volts AC (50 or 60 Hz; single phase). 2.2.1 AC Line Voltage Setting Voltage selection is automatic;...

  • Page 19: Fuses

    2.2.2 Fuses The fuse holder is located on the back panel just above the power connection. Illustration 2–3 Fuse Holder For 120 to 200 VAC operation, use the fuse installed at the factory. For 200 to 240 VAC opera- tion, use the slow-blow fuse located in a hardware kit within the transmitter packaging. Consult the following table: AC Input Voltage Fuse Rating...

  • Page 20: Frequency (Channel) Selection

    3. To change the operating band from 87.9-107.9MHz to 76-90MHz or vice versa, or to adjust the modulation compensation pot, remove the top cover to gain access to these features. See Illustrations 2-6 and 2-10. Frequency Selector Switches Illustration 2–6 Top Cover Removed FM600 User’s Manual...
  • Page 21 2.3 Frequency (Channel) Selection, continued Megahertz Illustration 2–7 Transmitter Front Panel (Frequency Selector Switches) = 88.10 MHz = 107.90 MHz Illustration 2–8 Two Sample Frequency Selections Installation...

  • Page 22: Modulation Compensator

    Frequency of Operation (MHz) Modulation Compensation Pot Setting 97.1 82.4 Illustration 2–9 Modulation Compensator Settings These compensator settings are approximate. Each mark on the potentiometer represents about 1.8% modulation compensation. Modulation Compensator Illustration 2–10 Modulation Compensator Pot FM600 User’s Manual...

  • Page 23: Receiver Frequency Selection

    2.4 Receiver Frequency Selection If you have a transmitter equipped with the receiver option, you will need to set the receiving or incoming frequency. 1. With the top cover removed, locate the receiver module and the two switches (labeled SW1 and SW2).
  • Page 24 78.2 91.2 82.2 95.2 78.3 91.3 82.3 95.3 78.4 91.4 82.4 95.4 78.5 91.5 82.5 95.5 78.6 91.6 82.6 95.6 78.7 91.7 82.7 95.7 78.8 91.8 82.8 95.8 Illustration 2–12-1 Receiver Frequency Selection (Continued on next page) FM600 User’s Manual...
  • Page 25 Freq. 74-90 Freq. 88-108 Freq. 74-90 Freq. 88-108 82.9 95.9 86.6 99.6 83.0 96.0 86.7 99.7 83.1 96.1 86.8 99.8 83.2 96.2 86.9 99.9 83.3 96.3 87.0 100.0 83.4 96.4 87.1 100.1 83.5 96.5 87.2 100.2 83.6 96.6 87.3 100.3 83.7 96.7 87.4...
  • Page 26 107.8 104.2 107.9 104.3 108.0 104.4 104.5 104.6 104.7 104.8 104.9 105.0 105.1 105.2 105.3 105.4 105.5 105.6 105.7 105.8 105.9 106.0 106.1 106.2 106.3 106.4 106.5 106.6 106.7 106.8 106.9 Illustration 2–12-3 Receiver Frequency Selection 2-10 FM600 User’s Manual...

  • Page 27: Rf Connections

    2.5 RF Connections Connect the RF load, an antenna or the input of an external power amplifier, to the type-N, RF output connector on the rear panel. VSWR should be 1.5:1 or better. 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.

  • Page 28: Audio Input Connections

    If the program source requires a 600 Ω termination, see the motherboard configuration chart on page 4-9 for the proper configuration of the jumpers. 2-12 FM600 User’s Manual...

  • Page 29: Sca Input Connections

    2.7 SCA Input Connections You can connect external SCA generators to the SCA In connectors (BNC-type) on the rear panel. The inputs are intended for the 60 kHz to 99 kHz range, but a lower frequency may be used if the transmitter is operated in Mono mode. (The 23 to 53 kHz band is used for stereo transmission.) For 7.5 kHz deviation (10% modulation), input of approximately 3.5–volts (peak -to-peak) is required.

  • Page 30: Audio Monitor Connections

    Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropri- ate pins of header HD1 on the Audio Processor/Stereo Generator board. If you change the pre-emphasis, change the de-emphasis jumpers HD201 and HD202 on the Audio Processor/ Stereo Generator board to match. 2-14 FM600 User’s Manual...

  • Page 31: Program Input Fault Time-Out

    2.11 Program Input Fault Time-out You can enable an automatic turn-off of the carrier in the event of program failure. To enable this option, see remote I/O connector pin out chart on page 2-16. The time between program failure and carrier turn-off is set by a jumper (JP1) on the Driver Switch Logic board. (See page 6–3 for board location.) Jumper pins 1 and 2 (the two pins closest to the edge of the board) for a delay of approximately 30 seconds;...
  • Page 32 Fault Summary ( line goes high if any fault light is activated.) Meter PA Temperature (5 VDC=100 degrees C.) Meter PA Current (1VDC=10 DC Amperes.) Front Panel Voltmeter Input. No Connection. RDS RX RDS TX Ground 2-16 FM600 User’s Manual...

  • Page 33: Section 3-Operation

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

  • Page 34: Initial Power-Up Procedures

    3.1 Initial Power-up Procedures These steps summarize the operating procedures you should use for the initial operation of the transmitter. More detailed information follows. 1. Turn on the main power switch. Main Power Switch Illustration 3–2 Front Panel Power Switch FM600 User’s Manual...
  • Page 35 2. Verify the following: A. All three power amplifier cooling fans run continuously. B. The Lock Fault indicator flashes for approximately 5 seconds, then goes off. 3. Set the Input Gain switches for mid-scale wideband gain reduction on an average program level (see section 3.4).

  • Page 36: Power Switches

    Logic board, which enables the power supply for the RF driver. A "Lock Fault" or a low pin 17 (/Carrier Off) on the Remote I/O connector will hold the carrier off. (See section 2.12.) Carrier Switch Illustration 3–3 Front Panel Carrier Switch FM600 User’s Manual...

  • Page 37: Front Panel Bar-Dot Displays

    3.3 Front Panel Bar-Dot Displays Bar-dot LEDs show audio input levels, wideband and highband audio gain control, and modu- lation percentage. Resolution for the gain control and modulation displays is increased over a conventional bar-graph display using dither enhancement which modulates the brightness of the LED to give the effect of a fade from dot to dot.

  • Page 38: Input Gain Switches

    Processing to “0” or “10”. 3.6 Stereo-Mono Switch The Stereo-Mono slide switch selects the transmission mode. In Mono, feed audio only to the left channel. Although right-channel audio will not be heard as audio modulation, it will affect the audio processing. FM600 User’s Manual...

  • Page 39: Rf Output Control

    3.7 RF Output Control Set this control for the desired output power level. Preferably, set the power with an external RF wattmeter connected in the coaxial line to the antenna. You may also use the RF power reading on the digital multimeter. The control sets the RF output voltage.

  • Page 40: Fault Indicators

    At about 97°C (207° F), ALC voltage begins to decrease, reducing the PA supply voltage to prevent a further increase in temperature. By 105° C (221° F) the PA will be at the minimum output level, of approximately 190 Watts. FM600 User’s Manual...

  • Page 41: Section 4-Principals Of Operation

    Section 4—Principles of Operation This section 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 personnel. Principles of Operation...

  • Page 42: Part Numbering

    When referencing a particular component it is necessary to also reference the circuit board that it is associated with. Resistor R1 Resistor R1 Driver Switch Logic Board Audio Processor/Stereo Generator Board Illustration 4–1 Resistor R1 On Different Circuit Boards FM600 User’s Manual...

  • Page 43: Audio Processor/Stereo Generator Circuit Board

    4.2 Audio Processor/Stereo Generator Circuit Board The audio board provides the control functions of audio processing-compression, limiting, and expansion, as well as stereo phase-error detection, pre-emphasis and generation of the com- posite stereo signal. Illustration 6-4 and accompanying schematic may be useful to you during this discussion. The overall schematic for the audio board is divided into two sheets;...

  • Page 44: Stereo Generator Section

    6.2 4.2.2 Stereo Generator Section Composite stereo signal is generated from left and right-channel audio inputs. This section also has the amplifier (U201) for an optional external composite input and provision for inser- tion of SCA signal(s). FM600 User’s Manual...
  • Page 45 Processed, pre-emphasized left and right audio is passed through third-order lowpass filters comprised of U202A (203A) and associated circuitry. The filters decrease the level of audio products below 30 Hz. This low-frequency roll off is necessary to prevent disturbance to the phase-lock loop in the RF frequency synthesizer by extremely low-frequency audio compo- nents.

  • Page 46: Rf Exciter Circuit

    U14A, allowing for greater loop bandwidth with less degradation of the low frequency audio response. Lock and unlock status signals are available at the outputs of U15E and U15F respectively. Modulation is introduced to the VCO though R72 and R122. FM600 User’s Manual...

  • Page 47: Metering Circuit

    4.4 Metering Circuit The ALC and metering circuitry is on the motherboard (see Illustration 6–6). This circuit proc- esses information for the RF and DC metering, and produces ALC (RF level-control) bias. It also provides reference and input voltages for the digital panel meter, voltages for remote me- tering, and drive for the front-panel fault indicators.

  • Page 48: Motherboard

    The motherboard has configuration jumpers associated with different options that can be added at the time of order or at a later time as an upgrade. The motherboard configuration chart for these jumpers can be found on the following page. Configuration Jumpers Illustration 4–5 Motherboard Configuration Jumpers FM600 User’s Manual...
  • Page 49 Jumper FMA “E” FMA “T” FMA “T” FMA “R” 50k-Ohm Input 600-Ohm Input Short Short Short Short Short Short Short Short Open Open Short Open Open Open Open Open Open Open Short Open Open Open Open Open Open Open Short Open Open Open...

  • Page 50: Display Circuit Board

    Processing control, R50, is part of the audio processor. (See section 4.2.) The DPM IN and DPM REF lines are analog and reference voltage inputs to digital multimeter IC U12. They originate from analog data selectors on the ALC/ metering board. 4-10 FM600 User’s Manual...

  • Page 51: Driver Switch Logic Board

    4.7 Driver Switch Logic Circuit Board The Driver Switch Logic board is mounted on the bottom side of the transmitter chassis with the two power supplies. The Driver Switch Logic board performs the following five different functions, program audio detection, audio fail timer, PA current monitor, PSU2 voltage monitor, and driver switch.
  • Page 52 This circuit is only active if the /Auto Carrier line has been pulled low by grounding pin 5 on the Remote I/O connector on the back of the transmitter. See illustration 4-7 for diagnostic LED and test point positions on the Driver Switch Logic board. 4-12 FM600 User’s Manual...

  • Page 53: Rf Driver

    TP10 TP11 Illustration 4–7 Driver Switch Logic Board 4.8 RF Driver The RF Driver module is mounted next to the heat sinks on the bottom of the RF Amplifier/ Combiner sub chassis. The driver amplifies the approximate 20 milliwatts from the frequency synthesizer to about 20 watts to drive the RF power amplifiers.

  • Page 54: Rf Amplifier

    15 watts input and divides it equally to each power amp. Then the output from each am- plifier is combined to for a single output. RF Driver RF Power Amplifier Amplifiers Illustration 4–7 RF Power Amplifier Module 4-14 FM600 User’s Manual...

  • Page 55: Chassis

    4.10 Chassis The high voltage and low voltage power supplies, as well as the driver switch logic board are mounted on the bottom side of the chassis. Driver Switch Logic Board High Voltage Supply Low Voltage Supply Illustration 4–8 Chassis Bottom View 4.11 RF Output Filter &...

  • Page 56: Receiver Circuit Board Option

    Left and Right audio is present at this jack. A regular pair of 32 ohm stereo head- phones, such as the types used with portable audio devices, can be used to monitor the audio on the receiver module. Receiver Module Illustration 4–9 Receiver Module 4-16 FM600 User’s Manual...
  • Page 57 4.12 Receiver Circuit Board Option (Continued) When a stereo signal is present, LED 3 illuminates which indicates that left and right audio is available. Then the stereo signals go to gain stages and out to the RCA jacks on the back of the cabinet.
  • Page 58 Notes 4-18 FM600 User’s Manual...

  • Page 59: Section 5-Adjustments And Tests

    Section 5—Adjustments and Tests This section describes procedures for (1) advanced users who may be in- terested in customizing or optimizing the performance of the transmitter and (2) service personnel who want to return the transmitter to operational status following a maintenance procedure. Adjustments and Tests...

  • Page 60: Audio Processor Adjustments

    TP1 in the RF Exciter circuit of the Motherboard. Adjust the Separation control R244 for a straight centerline. Since proper adjustment of this control coincides with best stereo separation, use an FM moni- tor to make or confirm the adjustment. FM600 User’s Manual...

  • Page 61: Composite Output

    5.2.2 Composite Output You can make adjustments to the composite output in the following manner: Using a Modulation Monitor 1. Set the Stereo-Mono switch to Mono. 2. Check that the setting of the Modulation compensation control (see Illustration 2–9) on the RF Exciter circuit, falls within the range specified for the frequency of operation.

  • Page 62: Modulation Compensator

    With the front panel RF Output control fully clockwise, adjust the Power Set trim pot to 10% more than the rated power (660 watt for FM600) as indicated on an accurate external watt me- ter. If the authorized power is less than the maximum watts, you may use the power set to limit the range of RF output control.

  • Page 63: Swr Calibrate

    5.4.3 SWR Calibrate When the Carrier switch is off, or the RF power is less than about 5 watts, the SWR circuit automatically switches to a calibrate-check mode. (See section 4.5 for more information.) Set the digital panel meter to read SWR. With the Carrier switch off, set the SWR CAL trim pot (R66) to read 1.03.

  • Page 64: Bias Set (Rf Power Amplifier)

    You may select other times by changing the value of R28. The time is proportional to the re- sistance. 5.8 Bias Set (RF Power Amplifier) The Bias Set trim pot is located inside the PA module on the input circuit board. Set the trim pot to its full clock-wise position for near-optimum bias. FM600 User’s Manual...

  • Page 65: Performance Verification

    5.9 Performance Verification Measure the following parameters to receive a comprehensive characterization of trans- mitter performance: • Carrier frequency • RF output power • RF bandwidth and RF harmonics (see section 5.12) • Pilot frequency, phase, and modulation percentage • Audio frequency response •...

  • Page 66: Carrier Frequency

    For the response tests, take the readings from an FM modulation monitor. Make audio frequency response measurements for left and right channels at frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2. FM600 User’s Manual...

  • Page 67: Audio Distortion

    5.15 Audio Distortion Make distortion measurements from the de-emphasized output of an FM modulation moni- tor. Make audio distortion measurements for left and right channels at frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2. 5.16 Modulation Percentage While feeding an audio signal into the left channel only, confirm that the total modulation percentage remains constant when switching between Mono and Stereo.

  • Page 68: 38Khz Subcarrier Suppression

    10. Test ALC action with PA current overload, SWR, and PLL lock. NOTE: FCC type acceptance procedures call for testing the carrier frequency over the temperature range of 0–50 degrees centigrade, and at line voltages from 85% to 115% of rating. (See FCC Part 2.1055.) 5-10 FM600 Manual...
  • Page 69 Section 6—Reference Drawings The illustrations in this section may be useful for making adjustments, taking measurements, troubleshooting, or understanding the circuitry of your transmitter. Reference Drawings...
  • Page 70 Selector Switches Processing Control Illustration 6-1 Front View Composite Input RF Output RF Output Monitor Remote I/O Receiver Input SCA Inputs Audio Monitors Audio Inputs (Optional) Ground Stud Fuse Holder AC Power Input Illustration 6-2 Rear View FM600 User’s Manual...
  • Page 71 RF Output RF Exciter Circuit RF Low Pass Filter & Reflectometer Stereo Generator Section Audio Processor Metering Section Circuit Illustration 6-3 Chassis Top View Driver Switch Logic Board High Voltage Power Supply Low Voltage Power Supply Illustration 6-4 Chassis Bottom View Adjustments and Tests...
  • Page 72 Notes: FM600 User’s Manual...
  • Page 73 6.2 Board Layout and Schematics Illustration 6-5 Audio Processor/Stereo Generator Board Adjustments and Tests...
  • Page 74 THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. SHEET Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 1 of 2) FM600 User’s Manual FM600 User’s Manual...
  • Page 75 DWG. NO. REV. C204 R217 SCA IN C203 OPEN 100pF R230 R203 +12V EXT IN- Composite Spec. (Turkey): C202 R204 30Hz - 53KHz +/- 0.2 dBr 100pF 49.9K U201 53KHz - 76KHz +/- 0.4dBr R206 EXTERNAL COMPOSITE AD622 3.9K INPUT R201 EXT IN+ R202...
  • Page 76 Board Layouts and Schematics Illustration 6-6 Motherboard FM600 User’s Manual FM600 User’s Manual...
  • Page 77 DWG. NO. REV. 201207F-SCH REVISION HISTORY APPROVALS +12V E . C . N. DESCRIPTION DATE 201497F-SCH-SH3.SCH 201497F-SCH-SH2.SCH FAN- PRODUCTION RELEASE 03-08-07 +12V ALC/METERING HEADER 3 AUDIO PROCESSOR SHUNT RF EXCITER 4.7K +12V RF_LVL +5.00V +12V TL072 TEMP Vout OPEN HEADER 6X1 .156 -12V WR TP1 IRF541...
  • Page 78 2. ALL CAPACITORS ARE IN MICROFARADS. SIZE DWG . NO . 1.1K U23D 201497F-SCH +5.00V +5.00V J3-9,10 TL074 J4-12 SCALE : NONE PROJ NO. SHEET C_L_SHT2_A.DOT REV. A Schematic Diagram: Motherboard (Sheet 2 of 3) 6-10 FM600 User’s Manual FM600 User’s Manual...
  • Page 79 DWG. NO. 201497F-SCH REV. 88-108 MHZ +12V +12V 100PF MAR-6 OPEN 499K .001 U12A U12B FM_/LOCK NE5532 R87 499K FM_/LOCK NE5532 .001 .001 1N4148 +VDD R103 10/35V R102 OUTPUT TANT. 200K LOCK DET. .001 LOCK 5V_TCXO C109 U15F U15E .001 74HC14 74HC14 R105...
  • Page 80 SHALL NOT BE REPRODUCED, COPIED OR USED AS THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR DEVICES WITHOUT PERMISSION. FILENAME: SCALE : NONE PROJ NO. SHEET A_P_SHT1_A.DOT REV. A Schematic Diagram: FM Frequency Selection 6-12 FM600 User’s Manual FM600 User’s Manual...
  • Page 81 Illustration 6-9 FM Display Board Adjustments and Tests 6-13...
  • Page 82 THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS 2. ALL CAPACITORS ARE IN MICROFARADS. DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. SHEET C_L_SHT1_A.DOT REV. A Schematic Diagram: FM Display 6-14 FM600 User’s Manual FM600 User’s Manual...
  • Page 83 Illustration 6-10 Driver Switch Logic Board Adjustments and Tests 6-15...
  • Page 84 Solder Jumper ARE FOR REFERENCE ONLY. Solder Jumper Solder Jumper FILENAME: SCALE : NONE PROJ NO. SHEET C _L_SH T1_A .D O T R EV . A Schematic Diagram: Driver Switch Logic Board 6-16 FM600 User’s Manual FM600 User’s Manual...
  • Page 85 Illustration 6-12 FM600 Power Amplifier Module Adjustments and Tests 6-17...
  • Page 86 INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS FOR THE MANUFACTURE OR SALE OF APPARATUS OR FILENAME: ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. SCALE : NONE PROJ NO. SHEET B_L_SHT1_A.DOT REV. A Schematic Diagram: FM RF Amplifier 6-18 FM600 User’s Manual FM600 User’s Manual...
  • Page 87 Illustration 6-13 FM Low Pass Filter #2 Adjustments and Tests 6-19...
  • Page 88 INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS FOR THE MANUFACTURE OR SALE OF APPARATUS OR FILENAME: ARE FOR REFERENCE ONLY. DEVICES WITHOUT PERMISSION. SCALE : NONE PROJ NO. SHEET B_L_SHT1_A.DOT REV. A Schematic Diagram: FM Low Pass Filter #2 FM600 User’s Manual 6-20 FM600 User’s Manual...
  • Page 89 Illustration 6-14 FM RF Driver Adjustments and Tests 6-21...
  • Page 90 FOR THE MANUFACTURE OR SALE OF APPARATUS OR INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS DEVICES WITHOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. SHEET B_L_SHT1_A.DOT REV. A Schematic Diagram: FM RF Driver 6-22 FM600 User’s Manual FM600 User’s Manual...
  • Page 91 INCLUDING ASSOCIAT ED ELECT RONIC REPRODUCT IONS DEVICES W IT HOUT PERMISSION. ARE FOR REFERENCE ONLY. FILENAME: SCALE : NONE PROJ NO. SHEET C _L_SH T1_A .D O T R EV . A Schematic Diagram: FM600 Chassis Interconnect Adjustments and Tests 6-23...
  • Page 92 Section 7—Service and 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. Service and Support...

  • Page 93: Spare Parts

    You may be required to leave a message at this number but your call will be returned promptly from our on-call technician. 7.3 Spare Parts To obtain spare parts, call Crown Broadcast Sales at the following number. (866) 262-8972 You may also write to the following address: International Radio and Electronics Corporation P.O.
  • Page 94 Procedure for Obtaining Warranty Service Crown Broadcast will repair or service, at our discretion, any product failure as a result of normal in- tended use. Warranty repair can only be performed at our plant facility in Elkhart, Indiana USA or at a factory authorized service depot.
  • Page 95 Page Left Blank FM600 User’s Manual...

  • Page 96: Factory Service Instructions

    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 Crown Broadcast Customer Service at: Telephone: (866) 262-8917 or (866) 262-8972...

  • Page 97: Transmitter Output Efficiency

    665.1 90.2 40.3 12.55 505.8 32.4 11.11 83.3 9.22 212.1 70.7 14.8 8.26 22.2 49.1 107.9 51.1 16.24 829.9 79.5 48.8 15.8 77.8 14.56 611.5 73.6 34.6 12.83 443.9 67.6 26.4 10.91 52.1 16.2 7.09 129.4 46.4 FM600 User’s Manual...
  • Page 98 Page Left Blank Appendix...
  • Page 99 Notes: FM600 User’s Manual...
  • Page 100 Glossary The following pages define terms and abbreviations used throughout this manual. Glossary...
  • Page 101 Audio Frequency; the frequencies between 20 Hz and 20 kHz in the electromagnetic spectrum Automatic Level Control Amplitude Modulation; the process of impressing information on a radio-frequency signal by varying its amplitude. The range of frequencies available for signaling. Bandwidth Binary-Coded Decimal;...
  • Page 102 Field-Effect Transistor A circuit that generates precise frequency signals by Frequency Synthesizer means of a single crystal oscillator in conjunction with frequency dividers and multipliers. Frequency Modulation; the process of impressing a radio signal by varying its frequency. Frequency Shift Keying; an F technique for shifting the frequency of the main carrier at a Morse code rate.
  • Page 103 Used in conjunction with terrestrial networks. A transmitter equipped with an FSK ID option for Satellator re-broadcasting a satellite fed signal. Voltage Standing Wave Ratio; see “SWR.” VSWR See “Broadband.” Wideband Voltage Controlled Oscillator FM600 User’s Manual...
  • Page 104 Index Symbols 19–kHz Cables level adjustment 5–3 audio input 2–12 phase adjustment 5–3 Carrier 4–11,5–8 automatic turnoff 2–15,3–8,5–6,5–10 frequency 5–8, 5-10 Carrier switch 3–4,5–5 AC. See Power: input Channel. See Frequency ALC 3–3,3–7,4–7 main 5–9 Altitude main into sub 5–9 operating range 1–8 sub into main 5–9 Amperes PA DC 3–3,3–8...
  • Page 105 Front panel location 4-7 display modulation calibration 5-5 Modulation 2-11, 3-5, 5-3, 5-7, 5-8 FSK 1-5, 1-6 calibration 5-5 measurements 5-4 compensator 2-6 Fuses 2-3 display 3-5 percentage 3-5, 5-9 Monitor Gain control 3-5 audio 2-14, 4-5 FM600 User’s Manual...
  • Page 106 Processing M (continued) audio 1-2, 3-5 Mono control 3-6 operation 2-12, 3-6 control setting 3-3 Motherboard highband 3-5, 4-4 circuit description 4-8 Program failure 2-15, 5-10 Multimeter 3-7 Program source 2-12, 3-6 front panel 3-3 Receiver Nearcast frequency selection 2-7 transmitter use 1-3 option 1-5 Networks...
  • Page 107 PA 3-3, 3-8 Test point voltage 3-8 Tests performance 5-7, 5-10 Time-out program input failure 2-15 Translator transmitter use 1-5 VCO 4-6 Voltage AC selection 2-2 Voltage selection 2-2 Voltmeter display 3-8 Volts PA DC 3-3, 3-8 FM600 User’s Manual...

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