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Crown FM600 User Manual

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FM600 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

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  • Page 1 FM600 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...

  • 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 Booster 1.2.4 Exciter 1.2.5 Translator 1.2.6 Satellator 1.2.7 Nearcasting Transmitter/Exciter Specifications Receiver Specifications Safety Considerations 1-10 1.5.1 Dangers 1-10 1.5.2 Warnings 1-10 1.5.3 Cautions 1-10 Section 2–...
  • Page 4 Section 3-Operation Initial Power-up Procedures Power Switches 3.2.2 Power Switch 3.2.3 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 Balance 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 gen- erator board with a receiver module. This added feature makes the FM600 ideal for transla- tor 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 Frequency Range 87.9 MHz–107.9 MHz (76 MHz–90 MHz optionally available) RF Power Output (VSWR 1.7:1 or better) FM600 Up to 660 watts output RF Output Impedance 50 Ohms Frequency Stability Meets FCC specifications from 0-50 degrees C...
  • Page 14 RF Spurious Products Better than –70dB °C to 50°C) Operating Environment Temperature (0 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 FM600 _____________ FM600 User’s Manual...
  • Page 15 10–15% lower than stated. Regulatory Type notified FCC parts 73 and 74 Meets FCC, DOC Dimensions 32.38 x 59.69 x 62.23 centimeters 12.75 x 23.5 x 24.5 Inches Weight FM600 66 lbs 29.964 Kg Getting Acquainted...

  • Page 16: 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 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

    2.2 Power Connections The FM600 can operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; single phase). 2.2.1 AC Line Voltage Setting Voltage on FM600 is set by AC distribution Board.
  • Page 19 Illustration 2–2 Selecting an AC Line Voltage Installation...

  • Page 20: Power Connections

    For 100 to 120 VAC operation, use the fuse 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 FM600 100–120 V 220–240 V 12 A Illustration 2–4 Fuse Reference Table FM600 User’s Manual...

  • Page 21: Frequency (Channel) Selection

    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 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.
  • Page 22 See illustrations 2-6 and 2-10. Frequency Selector Switches Illustration 2–6 Top Cover Removed Megahertz Illustration 2–7 Transmitter Front Panel (Frequency Selector Switches) = 88.10 MHz = 107.90 MHz Illustration 2–8 Two Sample Frequency Selections FM600 User’s Manual...

  • Page 23: Modulation Compensator

    2.3.1 Modulation Compensator The Modulation trim-potentiometer (see illustration 2–10) compensates for slight variations in deviation sensitivity with frequency. Set the trim-pot dial according to the following graph: Frequency of Operation (MHz) Modulation Compensation Pot Setting 97.1 82.4 Illustration 2–9 Modulation Compensator Settings These compensator settings are approximate.

  • Page 24: Receiver Frequency Selection

    4. For 75us pre-emphasis short pins 3&4 and 5&6 on J2 of the Receiver card. 5. For 50us pre-emphasis short pins 1&2 and 7&8 on J2 of the Receiver card. 6. After setting the frequency, replace the top cover and screws. FM600 User’s Manual...
  • Page 25 Freq. 74-90 Freq. 88-108 Freq. 74-90 Freq. 88-108 74.9 87.9 78.9 91.9 75.0 88.0 79.0 92.0 75.1 88.1 79.1 92.1 75.2 88.2 79.2 92.2 75.3 88.3 79.3 92.3 75.4 88.4 79.4 92.4 75.5 88.5 79.5 92.5 75.6 88.6 79.6 92.6 75.7 88.7 79.7...
  • Page 26 102.5 85.9 98.9 89.6 102.6 86.0 99.0 89.7 102.7 86.1 99.1 89.8 102.8 86.2 99.2 89.9 102.9 86.3 99.3 90.0 103.0 86.4 99.4 103.1 86.5 99.5 103.2 Illustration 2–12-2 Receiver Frequency Selection (Continued on next page) 2-10 FM600 User’s Manual...
  • Page 27 Freq. 74-90 Freq. 88-108 Freq. 74-90 Freq. 88-108 103.3 107.0 103.4 107.1 103.5 107.2 103.6 107.3 103.7 107.4 103.8 107.5 103.9 107.6 104.0 107.7 104.1 107.8 104.2 107.9 104.3 108.0 104.4 104.5 104.6 104.7 104.8 104.9 105.0 105.1 105.2 105.3 105.4 105.5 105.6...

  • Page 28: Rf Connections

    If your transmitter is equipped with the receiver option, connect the incoming RF to the RF IN connector. Illustration 2–13 RF Connections 2-12 FM600 User’s Manual...

  • Page 29: Audio Input Connections

    2.6 Audio Input Connections Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The Left channel audio is used on Mono.) Pin 1 of the XLR connector goes to chassis ground. Pins 2 and 3 represent a balanced differential input with an impedance of about 50 kO . They may be connected to balanced or unbalanced left and right program sources.

  • Page 30: Sca Input Connections

    Input sensitivity is approximately 3.5–volt P-P for 75 kHz deviation. Enable the Composite Input by grounding pin 14 of the Remote I/O connector (see Illustration 2–18). Connect the composite signal using the Composite In BNC connector. 2-14 FM600 User’s Manual...

  • Page 31: Audio Monitor Connections

    Illustration 2–16 Composite In and Audio Monitor Connections 2.9 Audio Monitor Connections Processed, de-emphasized samples of the left and right audio inputs to the stereo genera- tor are available at the Monitor jacks on the rear panel. The signals are suitable for feeding a studio monitor and for doing audio testing.

  • Page 32: Program Input Fault Time-Out

    Remote control and remote metering of the transmitter is made possible through a 25–pin, D-sub connector on the rear panel. (No connections are required for normal operation.) Illustration 2–17 Remote I/O Connector Illustration 2–18 Remote I/O Connector (DB-25 Female) 2-16 FM600 User’s Manual...
  • Page 33 Pin Number Function Ground FMV Control Composite Out (sample of stereo generator output) FSK In (Normally high; pull low to shift carrier frequency ap- proximately 7.5 KHz. Connect to open collector or relay contacts of user-supplied FSK keyer.) /Auto Carrier Off (Pull low to enable automatic turnoff of carrier with program failure.) Meter Battery (Unregulated DC voltage;...
  • Page 34 Notes: 2-18 FM600 User’s Manual...

  • Page 35: 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 36: 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. 2. Turn on the main power switch. Main Power Switch Illustration 3–2 Front Panel Power Switch FM600 User’s Manual...
  • Page 37 3. Verify the following: A. The bottom cooling fan runs continuously. B. The Lock Fault indicator flashes for approximately 5 seconds, then goes off. 4. Set the Input Gain switches for mid-scale wideband gain reduction on an average program level (see section 3.4). 5.

  • Page 38: Power Switches

    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 39: 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 modulation 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 40: 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 41: 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 42: Fault Indicators

    By 60° C (140° F) for the FM50 and 85° C (185° F) for the FM150 and FM300, the PA will be fully cut off. The heatsink fan (models FM150°and FM300 only) is proportion- ally controlled to hold the heatsink at 35 C (95° F). Above this temperature, the fan runs at full speed. FM600 User’s Manual...

  • Page 43: 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 person- nel. Principles of Operation...

  • Page 44: Part Numbering

    Part Numbers Audio Processor 100’s Stereo Generator 200’s RF Exciter/Synthesizer 300’s Metering/Protection 400’s Motherboard 500’s Display 600’s Voltage Regulator 700’s Power Regulator 800’s RF Pre-driver 900’s Chassis Wiring 1000’s RF Power Amplifier 1100’s RF Low Pass Filter 1200’s FM600 User’s Manual...

  • Page 45: Stereo Generator Circuit

    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 composite 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 46: 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 in- sertion of SCA signal(s). FM600 User’s Manual...
  • Page 47 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 48: Rf Exciter Circuit

    U14A., allowing for greater loop band- width 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 49: Metering Circuit Board

    4.5 Metering Circuit The ALC and metering circuitry is on the motherboard (see Illustration 6–6). This circuit processes 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 metering, fan control, and drive for the front-panel fault indicators.

  • Page 50: 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 4–4 Configuration Jumpers FM600 User’s Manual...
  • Page 51 Motherboard Jumper Configuration Chart 4.6.1 Jumper FMA “E” FMA“T” FMA“T” FMA “R” 50KO input 600O input “Omnia” “Omnia” Analog AES input input Short Short Short Short Short Open Short Short Short Short Short Open Open Open Short Open Open Open Open Open Open...

  • Page 52: 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 multime- ter IC U12. They originate from analog data selectors on the ALC/ metering board. 4-10 FM600 User’s Manual...

  • Page 53: Voltage Regulator Circuit Board

    4.8 Voltage Regulator Circuit Board The voltage regulator board is the longer of three boards mounted under the chassis toward the side of the unit. It has switch-mode voltage regulators to provide +12, –12, and 20 volts. It also contains the program detection and automatic carrier control circuits. Illustration 6–10 and accompanying schematic complement this discussion.

  • Page 54: Power Regulator Circuit Board

    R22 resulting in 40 microamperes per amp of shunt current. R5 on the metering board converts Q3 collector current to 0.1 volt per amp of shunt current (.04 ma X 2.49 k). (See section 5.4.) 4-12 FM600 User’s Manual...

  • Page 55: Rf Driver/Amplifier

    4.11 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 fre- quency synthesizer to about 15 watts to drive the RF power amplifiers. A CA2832 hybrid, high-gain, wideband amplifier, operating at about 20 volts, provides about one watt of drive to a single BLF245 MOSFET amplifier.

  • Page 56: Chassis

    DC voltages, representative of forward and reflected power, go through a bulkhead filter board to the motherboard, then to the metering board, where they are processed for power control and metering and for SWR metering and protection. 4-14 FM600 User’s Manual...

  • Page 57: Receiver Circuit Board Option

    4.15 Receiver Circuit Board Option This option allows the transmitter to be used as a translator. The receiver board receives terrestrially fed RF signal and converts it to composite audio which is then fed into the ex- citer board. Microprocessor controlled phase lock loop technology ensures the received fre- quency will not drift, and multiple IF stages ensure high adjacent channel rejection.
  • Page 58 12 volts from the motherboard is filtered and supplies various needs on the board. Finally there is a precision reference voltage. Two 2.5 volt reference shunts act very much like a very accurate zener diode to provide a precision 5 volt supply to the metering board. 4-16 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 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 following a maintenance procedure. Adjustments and Tests...

  • Page 60: Audio Processor Adjustments

    TP301 on the RF Exciter circuit board. Ad- just the Separation control R244 for a straight centerline. Since proper adjustment of this control coincides with best stereo separation, use an FM monitor 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 meter. 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: Voltage Regulator Adjustment

    You may select other times by changing the value of R21. The time is proportional to the resistance. 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 midpoint 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 Audio distortion Modulation percentage FM and AM noise Stereo separation between left and right...

  • 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 Control Input Gain Switches Frequency Selector Switches Processing Control Illustration 6-1 Front View Composite Input RF Output Remote I/O SCA Inputs Audio Monitors Audio Inputs RF Output Monitor 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 Metering Procesor Circuit Section Bridge Rectifier AC Power Entry Voltage Regulator AC Power Transformer AC Distribution Board Power Regulators Illustration 6-4 Chassis Bottom View Adjustments and Tests...
  • Page 72 Board Layouts and Schematics Illustration 6-5 Audio Processor/Stereo Generator Board FM600 User’s Manual...
  • Page 73 Board Layouts and Schematics Motherboard FM600 User’s Manual...
  • Page 74 BAND LIMIT OFFSET DIRECT FSK FREQ. ADJ. AUTO ID RF_LVL TITLE: SCH, UNIVERSAL MOTHER BOARD SIZE DWG . NO . 201497F-SCH SCALE : NONE PROJ NO. SHEET C_L_SHT2_A.DOT REV. A Schematic Diagram: Motherboard (Sheet 3 of 3) FM600 User’s Manual...
  • Page 75 FM Frequency Selection Board (Top-Side) FM Frequency Selection Board (Bottom-Side)
  • Page 76 Board Layouts and Schematics FM Display Board FM600 User’s Manual...
  • Page 77 Board Layouts and Schematics FM Voltage Regulator FM600 User’s Manual...
  • Page 78 Board Layouts and Schematics FM Power Regulator FM600 User’s Manual...
  • Page 79 Board Layouts and Schematics FM Power Amplifier FM600 FM600 User’s Manual...
  • Page 80 Board Layouts and Schematics FM Low Pass Filter #2 FM600 User’s Manual...
  • Page 81 Board Layouts and Schematics FM RF Driver FM600 User’s Manual...
  • Page 82 FM Euroamp DC Input Feedthru Top Side FM Euroamp DC Input Feedthru Bottom Side...
  • Page 83 Q43533-1 PWA; FM600 AC INPUT REV NO. TITLE: PRINTS JOHN LANDA MADE BY: SHEET NO. 6-25-96 R108 DATE: FIRST MADE FOR: CONT. ON SH. CROWN INTERNATIONAL, INC., 25166 Leer Dr., ELKHART, IN, 46514 PHONE: 574-262-8900...
  • Page 84 BOARD LAYOUTS AND SCHEMATICS FM SCA INPUT FM600 USERS MANUAL...
  • Page 85 FM600 CHASSIS WIRING Mother Board Voltage Regulator Unreg Board HD505 Metering Ribbon Cable Board HD701 HD 502 HD503 HD504 J 403 HD561 HD702 Ribbon Ribbon J 602 J 601 Display Board Reflectometer Feed-Thru HD1202 1 2 3 4 5 6...
  • Page 86 Notes: FM600 User’s Manual...
  • Page 87 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 88: 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) 262-8919 You may also write to the following address: International Radio and Electronics Corporation P.O.
  • Page 89 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 90 Page Left Blank FM600 User’s Manual...

  • Page 91: 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) 262-8919...

  • Page 92: 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 93 Page Left Blank Appendix...
  • Page 94 Notes: FM600 User’s Manual...
  • Page 95 Glossary The following pages define terms and abbreviations used throughout this manual. Glossary...
  • Page 96 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. Bandwidth The range of frequencies available for signaling. Binary-Coded Decimal;...
  • Page 97 Field-Effect Transistor Frequency Synthesizer A circuit that generates precise frequency signals by 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 98 Used in conjunction with terrestrial networks. Satellator A transmitter equipped with an FSK ID option for re-broadcasting a satellite fed signal. VSWR Voltage Standing Wave Ratio; see “SWR.” Wideband See “Broadband.” Voltage Controlled Oscillator FM600 User’s Manual...
  • Page 99 Index Symbols 19–kHz Cables level adjustment 5–3 audio input 2–13 phase adjustment 5–3 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 AC. See Power: input Channel. See Frequency ALC 3–3,3–7,4–7 main 5–10 Altitude main into sub 5–10 operating range 1–8 sub into main 5–10 Amperes PA DC 3–3,3–8...
  • Page 100 5-4 display modulation calibration 5-5 location 4-7 FSK 1-5, 1-6 Modulation 2-12, 3-5, 5-3, 5-7, 5-8 measurements 5-4 calibration 5-5 Fuses 2-4, 7-4 compensator 2-7 display 3-5 percentage 3-5, 5-9 Gain control 3-5 Monitor audio 2-15, 4-5 FM600 User’s Manual...
  • Page 101 M (continued) Processing audio 1-2, 3-5 Mono control 3-6 operation 2-13, 3-6 control setting 3-3 Motherboard highband 3-5, 4-4 circuit description 4-8 Program failure 2-16, 5-10 Multimeter 3-7 Program source 2-13, 3-6 front panel 3-3 Receiver Nearcast frequency selection 2-8 transmitter use 1-6 option 1-5 Networks...
  • Page 102 5-7, 5-10 Time-out program input failure 2-16 Transformer 4-14 Translator transmitter use 1-5 VCO 4-6 Voltage AC selection 2-2 Voltage regulator 3-8 adjustments 5-6 circuit description 4-11 Voltage selection 2-2 Voltmeter display 3-8 Volts PA DC 3-3, 3-8 FM600 User’s Manual...

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