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M/A-Com 19D902797G1, Maintenance Manual

The M/A-Com 19D902797G1 Maintenance Manual is your comprehensive guide to properly maintaining and optimizing your product's performance. This essential manual is available for free download from our website, providing you with the necessary instructions and insights to ensure the longevity and efficiency of your device.

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OUTLINE DIAGRAM

POWER AMPLIFIER BOARD A1
19D902794G1 REV. C AND LATER

(19D902794, Sh.1, Rev. 18)

POWER AMPLIFIER BOARD A1
19D902794G1 REV. B AND EARLIER

(19D902794, Sh 1, Rev 15)

LBI-38531G

8

Summary of Contents for 19D902797G1

Page 1: ...utput of 55 to 110 watts at the antenna The assembly consists of a printed wiring board A1 and associated components including a power module and three RF power transistors mounted to the heat sink assem bly The printed wiring board A1 contains both the power amplifier circuitry 100 series components and the power control circuitry 200 series components Unfiltered supply voltage A for the power am...

Page 2: ... driver is a 6 dB RF amplifier A network consisting of C114 C117 and C139 and L103 and L105 provides interstage impedance matching between U102 and Q101 The signal from the LLA typically 40 dBm 10 W is amplified to 46 dBm 40 W Impedance matching between the driver output and the input to U103 is provided by C145 C148 C152 C153 and L108 The splitter U103 is a quadrature 90 hybrid coupler It divides...

Page 3: ... U201D controls the current flow thru Q202 and the output of Q203 The collector output of Q203 adjusts the control voltage Vct1 This control voltage is capable of adjusting the total PA output power since it provides the first stage DC supply to the Low Level Amplifier U102 During over temperature operation a scaled repre sentation of the forward power is maintained constant by varying the control...

Page 4: ...10 mW 10 dBM 2 Check the voltage on J201 3 POWER SET For nominal output power this voltage should be above 6 volts 3 Check the power supply voltage on the collector of Q101 Q102 and Q103 Voltage should be nominal 13 4 Vdc 4 One of the two final PA transistors Q102 or Q103 is defective Replace the defective transistor 5 Low power at PA output port and PA ALARM is ON 1 Check for over temperature and...

Page 5: ...U100 19A705532P2 VOLTAGE REGULATOR U101 344A3221P1 MMIC AMPLIFIER U102 19A70532P1 PA AMPLIFIER MODULE IC DATA PARTS LIST LBI 38531G 4 ...

Page 6: ...or adjacent channel transient power Changed resistor R224 Resistor R224 was 19B800607P103 10k ohms Added Zener diode D211 between transistor Q201 C cathode and Q201 E anode REV B POWER AMPLIFIER MODULE 19D902797G1 REV C POWER AMPLIFIER BOARD 19D902794G1 To replace transistor Q101 no longer manufactured by vendor and to improve final PA stability Added capacitors C118 and C301 C304 Added ferrite be...

Page 7: ...POWER AMPLIFIER ASSEMBLY 19D902797G1 19D902797 Sh 1 Rev 14 19B801659 Sh 2 Rev 3 POWER AMPLIFIER ASSEMBLY 19D902797G1 19D902797 Sh 2 Rev 14 ASSEMBLY DIAGRAM LBI 38531G 6 ...

Page 8: ...ASSEMBLY OUTLINE SCHEMATIC DIAGRAMS LOW PASS FILTER MODULE 19D902856G1 19D902856 Sh 1 Rev 1 LOW PASS FILTER MODULE 19D902856G1 19D902853 Sh 1 Rev 2 19D902854 Comp Side Rev 9A LBI 38531G 7 ...

Page 9: ...OUTLINE DIAGRAM POWER AMPLIFIER BOARD A1 19D902794G1 REV C AND LATER 19D902794 Sh 1 Rev 18 POWER AMPLIFIER BOARD A1 19D902794G1 REV B AND EARLIER 19D902794 Sh 1 Rev 15 LBI 38531G 8 ...

Page 10: ...POWER AMPLIFIER ASSEMBLY 19D902797G1 19D902798 Sh 1 Rev 9 SCHEMATIC DIAGRAM LBI 38531G 9 ...

Page 11: ...SCHEMATIC DIAGRAM POWER AMPLIFIER ASSEMBLY 19D902797G1 REV B AND EARLIER 19D902798 Rev 4 LBI 38531G 10 ...

Page 12: ...POWER AMPLIFIER ASSEMBLY 19D902797G1 REV C AND LATER 19D902798 Rev 9 SCHEMATIC DIAGRAM LBI 38531G 11 ...

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