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®
FM1000A
RF Amplifier Package
User's Manual
©2005 Crown Broadcast, a division of International Radio and Electronics, Inc.
25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A.
(574) 262-8900
i
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Revision Control Revision Print Date Initial Release (Rev. 0) 900413-1 November 1998 Revision 1 April 2002 Important Notices ©2005, Crown Broadcast, a division of International Radio and Electronics, Inc. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form by any means without the written permission of Crown International, Inc. Printed in U.S.A. Crown attempts to prov
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Contents Contents Contents Contents Contents Section 1—Getting Acquainted 1.1 Your Amplifier Package .......................................................................................1–2 1.2 Amplifier Package Specifications .........................................................................1–3 1.3 Safety Considerations ..........................................................................................1–4 1.3.1 Dangers ............................................................
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4.2 PS1000 Power Supply ......................................................................................4–4 4.2.1 AC Input Board .............................................................................................4–5 4.2.2 PFC (Power Factor Correcting) Switching Board ..........................................4–5 4.2.3 DC Output Board ..........................................................................................4–6 4.2.4 Cooling Fans ...................................
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I INFORMATION Section 1—Getting Acquainted This section provides a general description of the FM1000A power amplifier system and introduces you to safety conventions used within this document. Review this material before install- ing or operating the amplifier and power supply. Getting Acquainted 1–1
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I 1.1 Your Amplifier Package The FM1000A is a highly efficient amplifier package designed to set a new standard in FM transmitter design offering modularity, ease of use, and long-term reliabil- ity. The FM1000A package includes a PA1000 amplifier, PS1000 power supply, and an FM1K accessory pack. The PA1000 broadband amplifier requires no tuning and typically provides 80% RF efficiency across the band. The PS1000 power supply is power factor corrected and 90% efficient. Modern MOSFET technolo
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1.2 Amplifier Package Specifications RF Power Output: 100 to 1100 watts continuous with remote controlled power adjust RF Drive Requirement: 30 watts for full output RF Output Impedance: 50 ohms (unbalanced) Maximum SWR: 1.7:1 (With power foldback at high SWR) Frequency Range: 87–108 MHz RF Harmonics/Spurious Products: Better than –80 dB Asynchronous AM S/N Ratio: Better than –55 dB with 100% modulation at 400 Hz, no de-emphasis, no FM modulation (typically > 60 dB) Synchronous AM S/N
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I 1.3 Safety Considerations Crown Broadcast assumes the responsibility for providing you 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. Follow the associated guidelines to avoid potential hazard. 1.3.1 Dangers DANGER represents the most severe hazard aler
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® Section 2—Installation This section provides important guidelines for installing your power amplifier and power supply. Review this information care- fully for proper installation. Installation 2–1
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2.1 Operating Environment You can install the FM1000A amplifier system in a standard 19–inch component rack or on a suitable surface such as a bench or desk. In any case, the area should be as clean and well-ventillated as possible. The power supply must be installed directly above or below the power amplifier (for the included dressed cables to reach their respective connectors). 2.2 Tools Required To install the power supply and power amplifier, you will need the following tools: q Medium ph
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2.4 Preinstallation 2.4.1 Power Amplifier Modules The PA1000 incorporates four power amplifiers (two each in two modules). Due to possible damage during shipment, the power modules have been removed. Follow these steps to install the modules: 1. Remove the front panel of the PA1000 (four screws). 2. Taking ESD precautions (see page 2–2), unpack the power modules and place them on your work area with the circuit sides up. Connector Warning Label Slide Rail Illustration 2–1 Power Amplifier Modul
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2.4.2 Hubble Twist Lock® Connector Wiring Prepare the wiring for the Hubble Twist-Lock® connector in the following manner before connecting to your AC power source: 1. Use round cord with a diameter of 0.385–0.780 inches (10–20 mm), Type SJ 12/3 – 10/3; Type S 16/3 – 10/3. 2. Select conductor size from your National Electrical Code®. 3. Slide the cover onto the cord. Remove insulation from cable and conductors as shown in Illustration 2–3. Do not tin conductors. 1 Inch (25 mm) 5/8 Inch (16 mm)
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2.5 Installation 1. Mount the units in an appropriate 19–inch wide cabinet. The power supply must be installed directly below the power amplifier for the included cables to reach their respective connectors (see illustration 2–4 below). Note: The PS1000 weighs approximately 40 pounds (18.1 kg); the PA1000, approximately 43 pounds (19.5 kg). Use help to install. 2. Ensure that the PS1000 power switch is off, the circuit breakers of the 240 VAC source on the back panel are off, and the AC conne
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8. Using the supplied connector, tie together pins 6 and 7 of the Remote I/O connector. The amplifier will not operate without this connection or a remote switch on these pins. (See Section 2.6 for Remote I/O connection.) 9. If monitoring of the output signal is desired, connect the RF monitor cable to the BNC connector on the PA1000. 10. Connect the DC input/output cables between the PA1000 and the PS1000 as illustrated (Illustration 2–4). The connector end with the ground lead con- nects t
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the level up to that limit and down to zero. When a specific output power level is set, the Metering and Control Board controls and maintains the setting to keep the power constant. The location of the Local Power Adjust (R62), the on-board Raise and Lower switches (SW3 & SW4), and the Local/Remote slide switch (SW5) are shown below. Local/Remote Slide Switch On-board Remote Power Adjust Buttons Local Power Adjust Pot Illustration 2–6 On-board Remote Power & Related Controls Another remote con
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Pin # Function 1 PA#8 Current Monitor (a buffered metering output with 1 V = 2 A) 2 PA#7 Current Monitor (a buffered metering output with 1 V = 2 A) 3 Ground 4 Remote RAISE Power (a momentary switch, on this pin, when held low will raise the power level 10 watts every 0.5 seconds) 5 Remote RF Power Control (a resistor to ground on this pin reduces RF power output level below internal limits. See Section 2.6, page 2–7) 6 Ground 7 Remote AC Power On (a latching switch, on this pin, when held low
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Section 3—Operation This section provides general operating parameters of your power amplifier system and a detailed description of the front panel display. Operation 3–1
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3.1 Initial Power-up Procedures These steps summarize the operating procedures you should use for the initial operation of the power amplifier and power supply. More detailed information follows. 1. Ensure that the external remote control unit is properly connected (See the Pin Out Description Table, Section 2.6, page 2–8 for proper pin configura- tion). If not using a remote control unit, pin 7 must be tied to ground pin 6. 2. Connect Antenna. 3. If using an external remote control, enable th
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6. Before power-up, place the Local/Remote switch (located on the Metering & Control board behind the front panel) in the Local position and adjust the output power limit to the mid-level position using the Local Power Adjust, also on the Metering & Control board (see Illustration 3–2 below). The unit is normally shipped with this setting. See Section 2.6 for setting up remote operation and using the on-board remote buttons and other controls. 7. Turn on the main power switch located on the f
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10. Verify that the following conditions are present as indicated by the PA1000’s Digital Multimeter: a. In Ref—Should read between 0.4 and 0.8 volts (0.5 nominal, dependent upon power input level). b. SWR—Should read 1.05 to 1.5. c. ALC—Should read between 4.00 and 6.00 volts for 1.1 kW output (less for lower output or danger conditions, i.e. high SWR). d. Power Out—Should read 1.10 for 1.1 kW output. e. PA Temp—Should read 35 to 50°C with ambient temperature of 25°C. The remainder of this sect
