Ericsson MASTR II 4EF4A1 Maintenance Manual Download Page 7 | Manualshive

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LBI-4938

LBI-4938

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Summary of Contents for MASTR II 4EF4A1

Page 1: ...Mobile Communications MASTR II POWER AMPLIFIER MODELS 4EF4A1 2 3 Maintenance Manual LBI 4938C Printed in U S A ...

Page 2: ...tometer samples the magnetic field caused by current in the transmission line and the electrical field from the voltage on the line on a properly matched line these two voltages are equal and cancel each other when reading REFLECTED power 0 reflected power When the probe is rotated 180 these two voltages add to indicate FOR WARD power When the load is not matched these two voltages be come unequal...

Page 3: ...r completely re aligning and loading Power Amplifier Models 4EF4A1 2 3 using KT 56 A as a Driver Unit in a KT 39 A transmitter Before tuning the Power Amplifier the Driver KT 56 A C must be aligned according to the Driver ALIGNMENT PROCEDURE 1 Connect the antenna or some other suitable 50 ohm load to the top jack on the Power Amplifier antenna relay 2 Turn the PLATE switch OFF on the PA Power Supp...

Page 4: ...PLATE current meter 16 Repeat steps 11 14 and 15 being sure not to exceed 275 mA at the PA PLATE current meter 17 Finger tighten the PA COUPLING control locking nut 18 Turn the SCREEN adjust R461 on the PA power supply counterclockwise to obtain the licensed power output or PA Plate Power input Power levels with typical PA plate current values are shown in Fig 1 The current shown in Fig 1 does not...

Page 5: ...SCHEMATIC DIAGRAM 25 42 MHz 150 300 WATT MASTR II POWER AMPLIFIER MODELS 4EF4A1 2 PARTS LIST SCHEMATIC DIAGRAM LBI 4938 LBI 4938 4 ...

Page 6: ...PARTS LIST LBI 4938 LBI 4938 5 ...

Page 7: ...LBI 4938 LBI 4938 6 ...

Page 8: ...SCHEMATIC DIAGRAM SCHEMATIC DIAGRAM 42 50 MHz 150 300 WATT MASTR II POWER AMPLIFIER MODEL 4EF4A3 LBI 4938 LBI 4938 7 ...

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