User's Manual - Crown Broadcast

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3.1 Initial Power-up ProceduresThese steps summarize the operating procedures you should use for the initial operation ofthe transmitter. More detailed information follows.1. Turn on the DC breaker.2. Turn on the main power switch.Illustration 3–1 DC BreakerMain PowerSwitchIllustration 3–2 Front Panel Power Switch3-2 FM30/FM150/FM300 User’s <strong>Manual</strong>
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 averageprogram level (see section 3.4).5. Set the Processing control (see section 3.5; normal setting is “50”).6. Set the Stereo-Mono switch to Stereo (see section 3.6).7. Turn on the Carrier switch.8. Check the following parameters on the front panel multimeter:A. RF Power should be 29–33 watts for the FM30, 145–165 watts for the FM150, and300–330 watts for the FM300.B. SWR should be less than 1.1. (A reading greater than 1.25 indicates an antennamismatch.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, and37–52 volts for the FM300. (Varies with antenna match, power, and frequency.)E. PA DC Amperes should be 1.5–2.5 amps for the FM30, 5.5–7.5 amps for theFM150, and 7.0–9.0 amps for the FM300. (Varies with antenna match, power, andfrequency.)F. PA Temperature should initially read 20–35 degrees C (room temperature). Afterone hour the reading should be 35–50 degrees C.G. Supply DC Volts should display a typical reading of 45 V with the carrier on and 50 Vwith the carrier off for both the FM30 and FM150 products. For the FM300, thereadings should be 65 V with the carrier on and 75 V with carrier off.H. Voltmeter should be reading 0.0.The remainder of this section describes the functions of the front panel indicatorsand switches.Operation3-3
Page 2 and 3: Revision ControlRevisionPrint DateI
Page 4 and 5: Section 3-Operation 3-13.1 Initial
Page 6 and 7: Section 6-Reference Drawings 6-16.1
Page 8 and 9: 1.1 Your TransmitterThe FM30, FM150
Page 10 and 11: 1.2.1 Stand-AloneIn the standard co
Page 12 and 13: 1.2.5 SatellatorOne additional opti
Page 14 and 15: Subcarrier Suppression50dB below ±
Page 16 and 17: 1.4 Receiver SpecificationsMonaural
Page 18 and 19: 2.1 Operating EnvironmentYou can in
Page 20 and 21: 2.2.2 FusesThe fuse holders are loc
Page 22 and 23: 2. Use small flat blade screwdriver
Page 24 and 25: 2.4 Receiver Frequency SelectionIf
Page 26 and 27: Freq. 74-90 Freq. 88-108 SW1 SW2 Fr
Page 28 and 29: 2.5 RF ConnectionsConnect the RF lo
Page 30 and 31: 2.7 SCA Input ConnectionsYou can co
Page 32 and 33: 2.11 Program Input Fault Time-outYo
Page 34 and 35: Notes:2-18 FM30/FM150/FM300 User’
Page 38 and 39: 3.2 Power Switches3.2.1 DC BreakerT
Page 40 and 41: 3.4 Input Gain SwitchesThe “+6 dB
Page 42 and 43: PA DC Volts—Supply voltage of the
Page 44 and 45: 4.1 Part NumberingAs this section r
Page 46 and 47: Q1 (Q2) is a recover/expansion gate
Page 48 and 49: 4.3 RF Exciter CircuitThis circuit
Page 50 and 51: 4.6 MotherboardThe motherboard is t
Page 52 and 53: 4.7 Display Circuit BoardThe front-
Page 54 and 55: 4.9 Power Regulator Circuit BoardTh
Page 56 and 57: 4.13 ChassisThe AC power supply com
Page 58 and 59: When a stereo signal is present, LE
Page 60 and 61: 5.1 Audio Processor Adjustments5.1.
Page 62 and 63: 5.3.2 Modulation CompensatorRefer t
Page 64 and 65: 5.7 Voltage Regulator AdjustmentsJP
Page 66 and 67: 5.10 Carrier FrequencyCarrier frequ
Page 68 and 69: 5.20 38-kHz Subcarrier SuppressionW
Page 70 and 71: 6.1 ViewsGainReduction/ExpansionInd
Page 72 and 73: Notes:6-4FM30/FM150/FM300 User’s
Page 74 and 75: 747455223344557766223344557766Board
Page 76 and 77: Board Layouts and SchematicsIllustr
Page 78 and 79: 232112123Board Layouts and Schemati
Page 80 and 81: Board Layouts and Schematics1 2 3 4
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Page 84 and 85: 6543211357924683211+8Board Layouts
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Board Layouts and SchematicsF1 2 3
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Board Layouts and Schematics1 2 3 4
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Board Layouts and SchematicsEP1 2 3
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Board Layouts and SchematicsF1 2 3
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7.1 ServiceThe product warranty (se
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The following lists describe the sp
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AppendixTransmitter Output Efficien
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Notes:A-3FM30/FM150/FM300 User’s
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AFALCAMBandwidthBCDBFOBNCBroadbandC
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RFSCAS/NSpurious productsStabilityS
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DDC. See Power: inputDe-emphasis 2-
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S (continued)Stand alonetransmitter
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User's Manual - Crown Broadcast

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