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Summary of Contents for Ericsson MASTR II 4EF4A1
- Page 1 LBI-4938C Mobile Communications ® MASTR POWER AMPLIFIER MODELS 4EF4A1,2,3 Printed in U.S.A. Maintenance Manual...
- Page 2 LBI-4938 LBI-4938 Antenna coupling is adjusted by the PA ANTENNA con- DESCRIPTION trol C489. The signal is fed from the filter to J481. The sig- TABLE OF CONTENTS nal from J481 is connected to the antenna through P1 and P2 General Electric Power Amplifier Models 4EF4A1, 2 DESCRIPTION .
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Page 3: Alignment Procedure
LBI-4938 LBI-4938 A check for loose nuts, screws, cables and parts. To reinsert the Power Amplifier tube, proceed as follows: MULTI-FREQUENCY OPERATION the PA Power Supply Control switch to the ON posi- tion. Allow 15-minutes for warmup. An inspection of the high- and low- voltage con- Insert the prongs of the tube extractor between the Tune the PA on the LF (lowest frequency). - Page 4 LBI-4938 OUTLINE DIAGRAM LBI-4938 13. Tighten the PA COUPLING control locking nut, just enough to support the control. 14. While the Driver is being keyed, rotate the PA COU- PLING to a maximum of 275 mA at the PA PLATE current meter.
- Page 5 LBI-4938 PARTS LIST SCHEMATIC DIAGRAM LBI-4938 SCHEMATIC DIAGRAM 25-42 MHz, 150-300-WATT MASTR II POWER AMPLIFIER MODELS 4EF4A1 & 2...
- Page 6 LBI-4938 PARTS LIST LBI-4938...
- Page 7 LBI-4938 LBI-4938...
- Page 8 LBI-4938 SCHEMATIC DIAGRAM LBI-4938 SCHEMATIC DIAGRAM 42-50 MHz, 150-300-WATT MASTR II POWER AMPLIFIER MODEL 4EF4A3...
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