Crown Low Power Transmitters - Crown Broadcast

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A B C pre-emphasis processing receiver RF SCA S/N spurious products stability stereo pilot stereo separation subcarrier suppression SWR THD The deliberate accentuation of the higher audio frequencies; made possible by a high-pass filter. The procedure and/or circuits used to modify incoming audio to make it suitable for transmission. An option which adds incoming RF capability to an existing transmitter. See also "Translator." Radio Frequency; (1) A specific portion of the electromagnetic spectrum between audio-frequency and the infrared portion. (2) A frequency useful for radio transmission (roughly 10 kHz and 100,000 MHz). Subsidiary Communications Authorization; see "subcarrier." Signal to Noise Unintended signals present on the transmission output terminal. A tolerance or measure of how well a component, circuit, or system maintains constant operating conditions over a period of time. See "pilot." The amount of left-channel information that bleeds into the right channel (or vice versa). A carrier signal which operates at a lower frequency than the main carrier frequency and which modulates the main carrier. The process used to hold back or stop certain frequencies. Standing-Wave Ratio; on a transmission line, the ratio of the maximum voltage to the minimum voltage or maximum current to the minimum current; also the ratio of load impedance to intended (50 ohms) load impedance. Total Harmonic Distortion G–4 FM30/FM100/FM250 User's Manual
translator satellator VSWR Wideband VCO A transmitter designed to internally change an FM signal from one frequency to another for retransmission. Used in conjunction with terrestrial-fed networks. A transmitter equipped with an FSK ID option for rebroadcasting a satellite-fed signal. Voltage Standing-Wave Ratio; see "SWR." See "broadband." Voltage-Controlled Oscillator Glossary G–5
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® FM30/FM100/FM250 Broadcast Trans
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Contents Section 1—Getting Acquai
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Section 5—Adjustments and Tests .
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I INFORMATION Section 1—Getting A
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1.2 Applications and Options Crown
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1.2.5 Translator A receiver configu
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1.3 Transmitter/Exciter Specificati
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Note: We set voltage and ampere req
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® Section 2—Installation This se
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120Vac Illustration 2-1 Removing th
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2.2.3 Battery Power Your transmitte
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2.3.1 Modulation Compensator The Mo
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Frequency SW1 SW2 87.9 0 0 88.0 8 0
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2.6 Audio Input Connections Attach
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SCA IN COMPOSITE IN MONITOR RIGHT L
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Pin Number Function 1 Ground 2 (no
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Section 3—Operation This section
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3. Verify the following: a. The bot
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3.3 Front Panel Bar-Dot Displays Ba
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3.7 RF Output Control Set this cont
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in questo mondo, erono due forse, u
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4.2 Audio Processor Circuit Board T
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Stereo Generator Board ® FM250 Ill
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Principles of Operation 4-7
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To get a direct reading of SWR, the
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4.8 Voltage Regulator Circuit Board
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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
Page 74 and 75: SEE NOTE 10 TOP SIDE COMPONENT MAP,
Page 76 and 77: D 8169-1 Illustration 6-8 RF Meteri
Page 79 and 80: 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
Page 84: 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
Page 92 and 93: 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 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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Crown Low Power Transmitters - Crown Broadcast

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