Summary of Contents for ISC 9T97A250
- Page 1 9T97A250 450-MHz Power Amplifier User Manual 9110.00118 REVB Copyright 2005 ISC Technologies...
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Page 2: Table Of Contents
Physical Description P. A. CIRCUIT AND LOGIC CIRCUIT DESCRIPTIONS... Power Amplifier Circuit Description Logic Circuit Description INSTALLATION Overview Cabinet Installation Operating and Servicing Hazards Checks and Adjustments Equipment Needed ADJUSTMENTS Power Amplifier Alignment and Tuning Logic Alignment Copyright 2005 ISC Technologies... -
Page 3: General
2. Reserved 3 DESCRIPTION The 9T97A250 UHF power amplifier is designed for FM operation in the 406 to 470 MHz band. The RF power output is continuously adjustable from 50 watts to 250 watts when driven by a 4-watt source. The RF input and output connectors are the type N panel mount (UG-58 AN) and are mounted on the rear of the power amplifier. -
Page 4: Features
3.3 Physical Description The 9T97A250 UHF power amplifier is rack panel mountable (19-inch). Front and rear covers are removable to gain access to all controls without removing the 9T97A250 from the rack. The front panel display consists of a red LED bar-graph display showing output power. Two red and two green status LEDs are also located on the front panel. - Page 5 The directional coupler provides about -33 dB of coupling at the center frequency. Schottkey diodes (D1 and D2) are used for de- tection of forward and reflected RF power. Copyright 2005 ISC Technologies...
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Page 6: Logic Circuit Description
D22 and D24 protect U5 from potential reverse bias conditions. 4.2.2.3 Eight Volt Supply The 8 Vdc regulation and power to the logic circuit is handled by U6 which is protected by diode D23. Copyright 2005 ISC Technologies... - Page 7 JR26 or JR27 (which ever is installed). Note Remember to replace JR26 or JR27 (whichever was installed) after theantenna system is set up. The power amplifier may be shutdown remotely if desired, by supplying 5 Vdc to pin 14 on connector DB15. Copyright 2005 ISC Technologies...
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Page 8: Installation
The optional cabinet, with one transmitter, has an approximate mass (weight) of 76 kg (167 lbs.). Ensure that the proper equipment and the required number of persons are available when lifting or moving your cabinet-installed transmitter to prevent injury to personnel or equipment. Copyright 2005 ISC Technologies... -
Page 9: Operating And Servicing Hazards
Radio Frequency energy exposure level. Compliance is ultimately the responsibility of the site licensee and a determination of compliance can only be made by evaluating the complex factors of the specific site. Copyright 2005 ISC Technologies... -
Page 10: Checks And Adjustments
5.5 Equipment Needed The following tools and equipment will be required to install the 9T97A250 RF power am- plifier. •... - Page 11 Section 6 before continuing with this installation. 15. Key the exciter momentarily and note the reflected power between the exciter and the power amplifier. If this is greater than 0.2 watt, contact ISC Technologies Customer Service before continuing.
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Page 12: Adjustments
6.1 Power Amplifier Alignment and Tuning 6.1.1 Why You Need to Tune The 9T97A250 RF power amplifier is factory adjusted at the desired frequency. If the fre- quency of operation has to be changed by more than 2 MHz away from the previous fre- quency, then the following adjustments should be made. -
Page 13: Logic Alignment
15. Switch OFF the power supply, disassemble the test equipment, and connect the exciter and power amplifier in its normal configuration. 6.2 Logic Alignment 6.2.1 Equipment The following tools and equipment will be required to properly align the 9T97A250 RF power amplifier. • Directional wattmeter, 50 ohms, 250 watts full scale, 5% accuracy. - Page 14 DO NOT install more than one alarm trip point jumper at any time, or else the display driver will be damaged. 16. Switch OFF the power. 17. Install JR26 or JR27 (which ever was installed previously). 18. Disassemble the test equipment, and connect the exciter and power amplifier in its normal configuration. Copyright 2005 ISC Technologies...
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