Crown Low Power Transmitters - Crown Broadcast

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CAUTION Possible equipment damage! Before operating the transmitter for the first time, check for the proper AC line voltage setting and frequency selection as described in sections 2.2 and 2.3. 2.1 Operating Environment You can install the FM transmitter in a standard component rack or on a suitable surface such as a bench or desk. In any case, the area should be as clean and wellventilated as possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you set the transmitter on a flat surface, install spacers on the bottom cover plate. If you install the transmitter in a rack, provide adequate clearance above and below. Do not locate the transmitter directly above a hot piece of equipment. 2.2 <strong>Power</strong> Connections The FM30, FM100, and FM250 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; single phase). Each transmitter can operate on DC power as well (28 volts for the FM30, 36 volts for the FM100, and 62 volts for the FM250). The transmitter can operate on fewer volts DC, but with reduced RF output power (see section 1.2). In addition, the transmitter isolates the AC and DC sources; both can be connected at the same time to provide battery backup in the event of an AC power failure. 2.2.1 AC Line Voltage Setting To change the voltage setting, follow these steps: 1. Disconnect the power cord if it is attached. 2. Open the cover of the power connector assembly using a small, flat blade screwdriver. See Illustration 2–1. 3. Insert the screwdriver into the voltage selection slot and remove the drum from the assembly. 4. Rotate the drum to select the desired voltage. See Illustration 2–2. 5. Replace the drum and cover and check to see that the correct voltage appears in the connector window. 6. Connect the AC power cord. 2–2 FM30/FM100/FM250 User's Manual
120Vac Illustration 2–1 Removing the <strong>Power</strong> Connector Cover remove drum before turn 120Vac 220Vac 240Vac Illustration 2–2 Selecting an AC Line Voltage Installation 2–3
Page 1 and 2: ® FM30/FM100/FM250 Broadcast Trans
Page 3 and 4: Contents Section 1—Getting Acquai
Page 5 and 6: Section 5—Adjustments and Tests .
Page 7 and 8: I INFORMATION Section 1—Getting A
Page 9 and 10: 1.2 Applications and Options Crown
Page 11 and 12: 1.2.5 Translator A receiver configu
Page 13 and 14: 1.3 Transmitter/Exciter Specificati
Page 15 and 16: Note: We set voltage and ampere req
Page 17: ® Section 2—Installation This se
Page 21 and 22: 2.2.3 Battery Power Your transmitte
Page 23 and 24: 2.3.1 Modulation Compensator The Mo
Page 25 and 26: Frequency SW1 SW2 87.9 0 0 88.0 8 0
Page 27 and 28: 2.6 Audio Input Connections Attach
Page 29 and 30: SCA IN COMPOSITE IN MONITOR RIGHT L
Page 31 and 32: Pin Number Function 1 Ground 2 (no
Page 33 and 34: Section 3—Operation This section
Page 35 and 36: 3. Verify the following: a. The bot
Page 37 and 38: 3.3 Front Panel Bar-Dot Displays Ba
Page 39 and 40: 3.7 RF Output Control Set this cont
Page 41 and 42: in questo mondo, erono due forse, u
Page 43 and 44: 4.2 Audio Processor Circuit Board T
Page 45 and 46: Stereo Generator Board ® FM250 Ill
Page 47 and 48: Principles of Operation 4-7
Page 49 and 50: To get a direct reading of SWR, the
Page 51 and 52: 4.8 Voltage Regulator Circuit Board
Page 53 and 54: 4.11 RF Driver (FM100/FM250) The RF
Page 55 and 56: 4.15 Receiver Circuit Board Option
Page 57 and 58: Section 5—Adjustments and Tests T
Page 59 and 60: Using a Modulation Monitor 1. Set t
Page 61 and 62: 5.3.4 FSK Balance Control An FSK si
Page 63 and 64: 5.8 Bias Set (RF Power Amplifier) T
Page 65 and 66: 5.14 Audio Frequency Response For t
Page 67 and 68: Section 6—Reference Drawings The
Page 70 and 71:
6.2 Board Layouts and Schematics Il
Page 72 and 73:
Illustration 6-6 Stereo Generator B
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SEE NOTE 10 TOP SIDE COMPONENT MAP,
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D 8169-1 Illustration 6-8 RF Meteri
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1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
Page 81 and 82:
R27 D 8167-5 Illustration 6-10 Disp
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2 4 6 8 3 2 1 1 3 5 7 9 6 5 4 3 2 1
Page 87 and 88:
R20 R19 Illustration 6-13 Power Amp
Page 89 and 90:
Illustration 6-14 RF Output Filter
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F 1 2 3 4 5 6 7 8 ADDED TO PWB (200
Page 96 and 97:
Section 7—Service and Support We
Page 98 and 99:
Crown Broadcast Three Year Limited
Page 100 and 101:
Factory Service Instructions To obt
Page 102 and 103:
Transmitter efficiency output RF Po
Page 104 and 105:
A B C AF ALC AM bandwidth BCD BFO B
Page 106 and 107:
A B C pre-emphasis processing recei
Page 108 and 109:
Symbols 19-kHz level adjustment 5-4
Page 110 and 111:
L labels 1-10 LEDs 3-5, 4-10 line v
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