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Copyright 2005 ISC Technologies

9T97A250 450-MHz Power Amplifier

User Manual

9110.00118

REVB

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Summary of Contents for 9T97A250

Page 1: ...Copyright 2005 ISC Technologies 9T97A250 450 MHz Power Amplifier User Manual 9110 00118 REVB...

Page 2: ...cal Description 4 P A CIRCUIT AND LOGIC CIRCUIT DESCRIPTIONS 4 1 Power Amplifier Circuit Description 4 2 Logic Circuit Description 5 INSTALLATION 5 1 Overview 5 2 Cabinet Installation 5 3 Operating an...

Page 3: ...rough a two terminal barrier strip on the rear of the power amplifier A 15 pin D connector for monitoring the power amplifier s operating condition using its associated test set is mounted near the ba...

Page 4: ...er to each final Each final amplifies this input power and the output from the finals are combined and filtered The alarm logic samples both the output forward power and reflected power 4 1 2 Driver T...

Page 5: ...tors C2 C3 C17 C5 and C6 Power 28 Vdc is fed via a faston tab to the collector of transistor Q1 through a dc coupling network Matching of the transistor s Q1 output is provided by Z4 Z3 C8 C9 C10 and...

Page 6: ...r fan driver and optional fixed bias supply The logic board has three connectors a 1 x 2 pin connector for the dc fan power a 6 pin connector for the regulator and a 2 x 8 pin connector for the power...

Page 7: ...LED D10 are red When these LED s are illuminated this indicates a problem in the power amplifier LED D9 is latched by Q1 where the reflected level is detected above a certain level 30 of rated power...

Page 8: ...D10 and sets the alarm The temperature sensor has hysteresis determined by R29 and R32 5 INSTALLATION 5 1 Overview The transmitter location should be chosen to protect the equipment from dust and extr...

Page 9: ...louver openings for airflow at both top and bottom 5 3 Operating and Servicing Hazards Voltages Operating voltages ranging from a few volts to 120 or 240 volts ac are present in this equipment Care ha...

Page 10: ...lifier into the rack but do not interconnect 2 Connect the voltmeter to the power supply Check that polarity is correct Check that the leads are not shorted out 3 Switch ON the power supply and check...

Page 11: ...er Check that the power amplifier s output power is acceptable 18 Switch OFF the power supply and disconnect the 250 watt R F load Remove the front panel of the power amplifier and connect the power a...

Page 12: ...250 W Tuning tool slot insulated DC ammeter 25 A full scale 2 5 accuracy Cables with appropriate connectors Test set M 97 6 1 3 Exciter Check 1 Set up the exciter and test equipment as shown in Figur...

Page 13: ...ired to properly align the 9T97A250 RF power amplifier Directional wattmeter 50 ohms 250 watts full scale 5 accuracy Directional wattmeter 50 ohms 5 watts full scale 5 accuracy 50 ohm termination 250...

Page 14: ...26 or JR27 to enable the power auto shutdown to either NO POWER or LOW POWER respectively 14 Switch ON the power key the exciter and connect a 10 Vdc voltmeter to test point TP4 P 13 1 on the logic bo...

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