Crown FM-3 Manuel d'utilisateur

iFM30/FM100/FM250Broadcast TransmitterUser's Manual®©2005 Crown Broadcast, a division of International Radio and Electronics, Inc.25166 Leer Driv

1–4FM30/FM100/FM250 User's ManualI1.2.1 Stand-AloneIn the standard configuration, the FM30, FM100, and FM250 are ideal stand-alonetransmitters.

7–5Service and SupportTo obtain factory service, complete the bottom half of this page, include it with the unit, and ship to:International Radio and

Appendix–1FM30/FM100/FM250 User's ManualAppendixTransmitter Output EfficiencyRF Power Output-FM 30PADC Volts PADC Amps RF Power Efficiency27.9 2.

Appendix–2FM30/FM100/FM250 User's ManualTransmitter efficiency outputRF Power Output-FM 100PADC Volts PADC Amps RF Power Efficiency31.2 5.72 110

G–1GlossaryGlossaryThe following pages define terms and abbreviations usedthroughout this manual.A B C

G–2FM30/FM100/FM250 User's ManualA B CAF Audio Frequency; the frequencies between 20 Hzand 20 kHz in the electromagnetic spectrum.ALC Automatic L

G–3GlossaryFET Field-Effect Transistorfrequency synthesizer A circuit that generates precise frequency signalsby means of a single crystal oscillator

G–4FM30/FM100/FM250 User's ManualA B Cpre-emphasis The deliberate accentuation of the higher audiofrequencies; made possible by a high-pass filte

G–5Glossarytranslator A transmitter designed to internally change an FMsignal from one frequency to another for retrans-mission. Used in conjunction

Index–1IndexSymbols19–kHzlevel adjustment 5–4phase adjustment 5–4AAC.See power: inputALC 3–3, 3–7, 4–8altitudeoperating range 1–8amperesPA DC 3–3

Index–2FM30/FM100/FM250 User's Manualcooling fan 3–3, 3–8control 4–9coverage area 1–4crosstalk 1–7measurements 5–9current limitPA 5–6DDC.Se

1–5Getting Acquainted1.2.5 TranslatorA receiver configuration (FM100R, for example) replaces the audio processor andstereo generator boards with a rec

Index–3Llabels 1–10LEDs 3–5, 4–10line voltage 2–2, 2–3lockstatus 4–7lock fault 3–8Mmetering 1–2circuit description 4–8metering boardadjustments

Index–4FM30/FM100/FM250 User's Manualinput 1–5, 2–10output 1–2, 1–5, 1–7, 3–3, 3–7impedance 1–7output filter 4–14tuning 2–7Ssafety 1–10sate

1–6FM30/FM100/FM250 User's ManualI1.2.6 SatellatorOne additional option is available for all configurations—an FSK Identifier (FSKIDer). This ad

1–7Getting Acquainted1.3 Transmitter/Exciter SpecificationsFrequency Range87.9 MHz–108 MHz (76 MHz–90 MHzoptionally available)RF Power Output (VSWR 1.

1–8FM30/FM100/FM250 User's ManualISubcarrier Suppression 50 dB below ±75 kHz deviationFM S/N Ratio (FM noise)Complete transmitter Better than –60

1–9Getting AcquaintedNote: We set voltage and ampere requirements to assist you in designing yoursystem. Depending on your operating frequency, actu

1–10FM30/FM100/FM250 User's ManualIIllustration 1–5 Sample Hazard AlertSevere shock hazard!Turn power off andwait approximately 1minute for capa

2–1InstallationSection 2—InstallationThis section provides important guidelines for installing your trans-mitter. Review this information carefully f

2–2FM30/FM100/FM250 User's Manual2.1 Operating EnvironmentYou can install the FM transmitter in a standard component rack or on a suitablesurface

2–3InstallationIllustration 2–2 Selecting an AC Line Voltage120VacIllustration 2–1 Removing the Power Connector Coverremove drumbefore turn120Vac220

iiRevision ControlRevision Print DateInitial Release (Rev. 0; K80620–6) February 1995Revision 1 (K80664–4)November 1995Revision 2 (K80664A2) March 199

2–4FM30/FM100/FM250 User's Manual2.2.2 FusesThe fuse holders are located in the power connector assembly just below the voltageselector.Illustrat

2–5InstallationOFFSCA INCOMPOSITE INMONITORRL23REMOTE I/ORIGHTLEFT/MONOBATTERY36 VDC+–CIRCUITBREAKER12.2.3 Battery PowerYour transmitter can operate o

2–6FM30/FM100/FM250 User's ManualMEGAHERTZ.1 .012. Locate the RF Exciter board and identify the frequency selector switcheswhich will be used to

2–7Installation2.3.1 Modulation CompensatorThe Modulation trim-potentiometer (see illustration 2–6) compensates for slightvariations in deviation sens

2–8FM30/FM100/FM250 User's Manual2.4 Receiver Frequency SelectionIf you have a transmitter equipped with the receiver option, you will need to se

2–9InstallationIllustration 2–11 Receiver Frequency SelectionFrequency SW1 SW287.9 0 088.0 8088.1 0 188.2 8 188.3 0 288.4 8 288.5 0 388.6 8 388.7 0 4

2–10FM30/FM100/FM250 User's Manual120VacRF OutputConnectorRF OutputMonitorSevere shock hazard!Do not touch the innerportion of the RFoutput conne

2–11Installation2.6 Audio Input ConnectionsAttach audio inputs to the Left and Right XLR connectors on the rear panel. (TheLeft channel audio is used

2–12FM30/FM100/FM250 User's ManualOFFSCA INCOMPOSITE INMONITORRL23REMOTE I/ORIGHTLEFT/MONOBATTERY36 VDC+–CIRCUITBREAKER1SCA InputsIllustration 2–

2–13InstallationIllustration 2–15 Composite In and Audio Monitor ConnectionsOFFSCA INCOMPOSITE INMONITORRL23REMOTE I/ORIGHTLEFT/MONOBATTERY36 VDC+–CI

iiiContentsContentsContentsContentsContentsSection 1—Getting Acquainted ... 1–11.1 Your Transmitter ...

2–14FM30/FM100/FM250 User's Manual2.11Program Input Fault Time-outYou can enable an automatic turn-off of the carrier in the event of program fai

2–15InstallationIllustration 2–17 Remote I/O Connector (DB-15 Female)Pin Number Function1 Ground2 (no connection)3 Composite Out (sample of stereo ge

2–16FM30/FM100/FM250 User's ManualNotes:

3–1OperationSection 3—OperationThis section provides general operating parameters of yourtransmitter and a detailed description of its front panel dis

3–2FM30/100/250 User's ManualOFFSCA INCOMPOSITE INMONITORRL23REMOTE I/ORIGHTLEFT/MONOBATTERY36 VDC+–CIRCUITBREAKER1Possible equipment damage!Befo

3–3Operation3. Verify the following:a. The bottom cooling fan runs continuously.b. The Lock Fault indicator flashes for approximately 5 seconds, theng

3–4FM30/100/250 User's Manual3.2 Power Switches3.2.1 DC BreakerThe DC breaker, on the rear panel, must be on (up) for transmitter operation, even

3–5Operation3.3 Front Panel Bar-Dot DisplaysBar-dot LEDs show audio input levels, wideband and highband audio gain control,and modulation percentage.

3–6FM30/100/250 User's Manual3.4 Input Gain SwitchesThe “+6 dB” and “+12 dB” slide switches set audio input sensitivity according tothe following

3–7Operation3.7 RF Output ControlSet this control for the desired output power level. Preferably, set the power withan external RF wattmeter connecte

ivSection 3—Operation... 3–13.1 Initial Power-up Procedures ...

3–8FM30/100/250 User's ManualPA DC Volts—Supply voltage of the RF power amplifier.PA DC Amps—Transistor drain current for the RF power amplifier.

4–1Principles of OperationSection 4—Principles of OperationThis section discusses the circuit principles upon which thetransmitter functions. This in

4–2FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconma

4–3Principles of Operation4.2 Audio Processor Circuit BoardThe audio processor board provides the audio control functions of a compressor,limiter, and

4–4FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconma

4–5Principles of OperationFM250®Illustration 4–3 Stereo Generator Boardeach with a Q of 5. The 38 and 19–kHz outputs of pins 1 and 20, respectively,

4–6FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconma

4–7Principles of Operation

4–8FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconma

4–9Principles of OperationTo get a direct reading of SWR, the reference input of the digital panel meter is fedfrom a voltage proportional to the forw

vSection 5—Adjustments and Tests ... 5–15.1 Audio Processor Adjustments ...

4–10FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconm

4–11Principles of Operation4.8 Voltage Regulator Circuit BoardThe voltage regulator board is the longer of two boards mounted under the chassistoward

4–12FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconm

4–13Principles of Operation4.11 RF Driver (FM100/FM250)The RF Driver assembly is mounted on a 100 mm x 100 mm plate in the under sideof the chassis.

4–14FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconm

4–15Principles of Operation®FM2504.15 Receiver Circuit Board OptionThis option allows the transmitter to be used as a translator. The receiver boardr

4–16FM30/FM100/FM250 User's Manualinquestomondo,forse,unosidicesediciamochemascrivendoconinquestomondo,forse,unosidicesediciamochemascrivendoconm

5–1Adjustments and TestsSection 5—Adjustments and TestsThis section describes procedures for (1) advanced users whomay be interested in customizing or

5–2FM30/FM100/FM250 User's Manual5.1 Audio Processor Adjustments5.1.1 Pre-Emphasis SelectionSelect the pre-emphasis curve (75 µsec, 50 µsec, 25 µ

5–3Adjustments and TestsUsing a Modulation Monitor1. Set the Stereo-Mono switch to Mono.2. Check that the setting of the Modulation compensation contr

viSection 6—Reference Drawings ... 6–16.1 Views ...

5–4FM30/FM100/FM250 User's Manual5.2.3 19–kHz LevelAdjust the 19–kHz pilot for 9% modulation as indicated on an FM modulationmonitor.(The composi

5–5Adjustments and Tests

5–6FM30/FM100/FM250 User's Manual5.4.4 PA Current LimitSince it may not be practical to increase the PA current to set the PA CurrentLimit contro

5–7Adjustments and Tests5.8 Bias Set (RF Power Amplifier)The Bias Set trim pot is located inside the PA module on the input circuit board.Set the trim

5–8FM30/FM100/FM250 User's Manual5.10 Carrier FrequencyCarrier frequency is measured at the output frequency with a frequency monitoror suitable

5–9Adjustments and Tests5.14 Audio Frequency ResponseFor the response tests, take the readings from an FM modulation monitor.Make audio frequency resp

5–10FM30/FM100/FM250 User's Manual5.19.1 Main Channel Into SubFeed the left and right channels in phase with audio (L+R) at 50 Hz, 100 Hz, 400Hz

6–1Reference DrawingsSection 6—Reference DrawingsThe illustrations in this section may be useful for making adjust-ments, taking measurements, trouble

6–2FM30/FM100/FM250 User's Manual6.1 ViewsIllustration 6–1 Front ViewIllustration 6–1 Front ViewIllustration 6–1 Front ViewIllustration 6–1 F

1–1Getting AcquaintedSection 1—Getting AcquaintedThis section provides a general description of the FM30, FM100,and FM250 transmitters and introduces

6–4FM30/FM100/FM250 User's Manual6.2 Board Layouts and SchematicsIllustration 6–5 Audio Processor BoardIllustration 6–5 Audio Processor BoardIl

6–5Reference DrawingsL OUT+5V-5VD3D4FLAT A=075uSEC A=1.050uSEC A=0.6725uSEC A=0.33GAIN: U5, Pin 2 to U8, Pin 2(No Hi-band gain reduction)C11220P

6–6FM30/FM100/FM250 User's ManualIllustration 6–6 Stereo Generator Board

6–7Reference DrawingsStereo GeneratorOUTPUT+12V+6V+12V-12V 2 3184U4ATL072R1210.0K1%R11100D3R583.9KR5524.9KC261.0 2 3184U6ATL072C271.0R5724.9KR92K1

TOP SIDE COMPONENT MAP, FM-VFM EXCITER UNCONTROLLED UNLESS OTHERWISE MARKED IN RED BY CM AS A CONTROLLED COPY, COPIES OF THESE DOCUMENTS AND ASSOCIATE

DWG. NO.REV.A200440-SCHHGFEDCBA1 2 3 4 5 6 7 8 9 10 11 12HGFEDCBA1 2 3 4 5 6 8 9 10 11 12E . C . N. REV DESCRIPTIONAPPROVALSPECHK CMDATE DWNREVISION H

6–10FM30/FM100/FM250 User's ManualD 8169-1Illustration 6-8 RF Metering Board

6–11Reference DrawingsFAULT SUMSWR LAMPPADC LAMPLOCK LAMP+5VPATEMP LAMPR45010KD411J2-1J4-8J3-18J3-12J3-14J3-20/+28V INH1110U405E74HC14/LOCK+5VD406D407

6 - 12FM30/FM100/FM250 User's Manual

1 2 3 4 5 6 7 8 9 10 11 12ABCDEFGH121110987654321HGFEDCBADWG. NO. REV.1201207-SCHE . C . N. REV DESCRIPTIONAPPROVALSPECHK CMDATE DWNREVISION HISTORY65

1–2FM30/FM100/FM250 User's ManualI1.1 Your TransmitterThe FM30, FM100, and FM250 are members of a family of FM stereo broadcasttransmitters. Cro

Jumper FMA "E" FMA "T" FMA"T" FMA "R" FMA "Omnia" FMA "Omnia" FMX "E" FMX "

Reference Drawings

6 - 16"110"REDGRNGRNGRNGRNGRNGRN+5V+12V5.00V+12V+12VC6281.0UFL218L317L416L515L614L713L812L911L1010MODE9RADJ8ROUT7DHI6L11V-2V+3DLO4IN5U608LM3

Reference Drawings6 - 17

DWG. NO.REV.ACQ43229-6HGFEDCBA1 2 3 4 5 6 7 8 9 10 11 12HGFEDCBA1 2 3 4 5 6 8 9 10 11 12THESE DRAWINGS AND SPECIFICATIONS ARE THEPROPERTY OF INTERNATI

Reference Drawings6 - 19

DWG. NO. REV.200915-SCHC1 2 3 4 7 8ABCDEF1 2 3 4 6 7 8ABCEF5THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OFINTERNATIONAL RADIO AND ELECTRONICS

Reference Drawings

6 - 22RF OUTPUT AMPLIFIERRF Output AmplifierFM30/FM100/FM250 User's Manual

Reference Drawings

1–3Getting AcquaintedFM250®1.2 Applications and OptionsCrown transmitters are designed for versatility in applications. They have been usedas stand-a

6 - 24RF Output Filter and ReflectometerRF OUTC121147PF NP0R120310*R120275C12047.1PFC12069.3PFC12085.13PFL120394.1NHL120487.5NH(195MHz) (176MHz) (252M

Reference Drawings6 - 25

DWG. NO. REV.Q43310-4P1 2 3 4 7 8ABCDEF1 2 3 4 6 7 8ABCEF5THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OFINTERNATIONAL RADIO AND ELECTRONICS CO

DWG. NO.REV.A201069-SCHHGFEDCBA1 2 3 4 5 6 7 8 9 10 11 12HGFEDCBA1 2 3 4 5 6 8 9 10 11 12E . C . N. REV DESCRIPTIONAPPROVALSPECHK CMDATE DWNREVISION H

6 - 28FM30/FM100/FM250 User's Manual

Reference Drawings6 - 29

7–1Service and SupportSection 7—Service and SupportWe understand that you may need various levels of support orthat the product could require servicin

7–2FM30/FM100/FM250 User's Manual7.1 ServiceThe product warranty (see opposite page) outlines our responsibility for defectiveproducts. Before r

Service and support 7 – 3 Crown Broadcast Three Year Limited Product Warranty SUMMARY OF WARRANTY Crown Broadcast, IREC warrants its broadca

7–4FM30/FM100/FM250 User's ManualThe following lists describe the spare parts kit available foryour transmitter.For the FM100 and FM250, use part