M/A-Com 19D902797G10 Maintenance Manual Download Page 34

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SCHEMATIC DIAGRAM

12.0 OUTLINE & SCHEMATIC DIAGRAM FOR 470-512 MHz LOW

PASS FILTER MODULE 19D902856G9

COMPONENT SIDE

(19D902853, Sh. 3, Rev. 3)

(19B804157, Rev. 0)

(19D903622, Sh. 2, Rev. 16)

LBI-38674L

Summary of Contents for 19D902797G10

Page 1: ...Filter 6 3 2 POWER CONTROL 7 3 2 1 Keying and Unkeying the PA 7 3 2 2 PA Output Power Set 7 3 2 3 PA Protection 7 3 2 4 Theory of Operation 7 3 2 5 Signal Interface 8 4 0 TROUBLESHOOTING 10 4 1 TROUBLESHOOTING GUIDE 10 4 2 LOW PASS FILTER TEST PROCEDURE 13 4 2 1 Recommemded Test Equipment 13 4 2 2 Test Set Up and Procedure 13 5 0 PARTS LIST 14 6 0 PRODUCTION CHANGES 23 7 0 IC DATA 26 8 0 ASSEMBLY ...

Page 2: ... Inc without any warranty Improvements and changes to this manual necessitated by typographical errors inaccuracies of current information or improvements to programs and or equipment may be made by M A COM Inc at any time and without notice Such changes will be incorportated into new editions of this manual No part of this manual may be reproduced or transmitted in any form or by any means electr...

Page 3: ...r SUPPLY VOLTAGE 13 4 Vdc CURRENT 29 Amps max 26 A typical rated power 13 4V G3 29 Amps max 21 A typical rated power 13 4V G6 G7 G9 G10 G11 29 Amps max 20 A typical rated power 13 4V G8 DUTY CYCLE Continuous STABILITY Stable into 3 1 VSWR all temp voltage freq 55 watts 110 watts G3 or 45 watts 90 watts G6 G7 G9 G10 G11 or 45 watts 90 watts G8 RUGGEDNESS AT HIGH VSWR No damage into open or shorted ...

Page 4: ...dule and three RF power transistors mounted to the heat sink assembly The printed wiring board A1 contains both the power amplifier circuitry and the power control circuitry Unfiltered supply voltage A for the power amplifier circuits enters the assembly via feedthrough capacitor C1 Power cable W4 routes the A from C1 to J103 on the PWB Filtered A voltage for the power control circuit enters the a...

Page 5: ... input impedance is matched to the 50 ohm output of the Exciter by C59 C61 C62 and L7 L23 and C49 provide the necessary output matching The stage provides 14 dB of gain to amplify the signal from the Exciter to 26 dBm 400 mW 3 1 3 Low Level Amplifier U1 The Low Level Amplifier LLA stage uses a 50 ohm thick film RF Power Module to amplify and control the output power Internally the module is a thre...

Page 6: ...40W SPLITTER FINALS Q2 Q3 6 dB 20W 20W 5 0 dB 5 0 dB 60W 60W COMBIMER DIRECTIONAL COUPLER REV FWD J104 RF OUT 130W G3 110W G6 G7 G9 G10 G11 90W G8 THERMAL SENSE POWER CONTROL CONTROL VOLTAGE PA KEY FILTER A 4 8V POWER SET 2 5 4V POWER SENSOR 10 dB J101 RF IN 10mW All power data is per miminum spec Nominal Voltage 13 4V 50 Ohm Load Room Temperature J1 J2 L P F ANTENNA Figure 1 Block Diagram 3 1 6 L...

Page 7: ...Protection The Power Control also protects the PA against over temperature and high VSWR conditions An over temperature condition exists when the flange temperature of the final output transistor reaches 80 C At this point the output power will drop below its set level The output power will continue to drop such that when the flange temperature reaches 125 C the PA output drops at least 10 dB belo...

Page 8: ...the power control circuit reduces the output power in order to limit the reflected power to 25 of the set power 3 2 5 Signal Interface The signal interface to the MASTR III Power Amplifier is supported by a six position feedthrough connector J201 with the following pinout 1 PWR Sensor 2 PA Key 3 PA PWR Set 4 NC 5 Ground 6 Fil A 3 2 5 1 Pwr Sensor This line indicates when the PA is experiencing adv...

Page 9: ...the PA before the KEY line is energized 3 2 5 3 PA PWR Set Interface Connector pin 3 This line is used to set the RF Power Output of the PA Minimum power output equals 4 volts and maximum power output equals 8 volts The driver of this line must be capable of supplying 8 volts at 1 0 mA 3 2 5 4 Fil A Interface Connector pin 6 This line provides the filtered supply voltage for the Power Control The ...

Page 10: ...ver a minimum of 10 Mw 2 Check the logic or DC inputs to the PA from the Interface Board through J201 a J201 2 PA KEY 5volts during transmit b J201 3 POWER SET 4 volts to 8 volts 4 volts represents zero RF power c J201 6 13 8 VF 13 8 Vdc 20 3 No power at PA output port and PA ALARM is ON 3 Defective PA Replace PA 4 Low power at PA output port and PA ALRAM is OFF 1 Low RF input to PA from TX Synthe...

Page 11: ...h G3 450 MHz 460 MHz 470 MHz G6 403 MHz 414 MHz 425 MHz G7 425 MHz 437 MHz 450 MHz G8 380 MHz 390 MHz 400 MHz G9 470 MHz 482 MHz 494 MHz G10 492 MHz 502 MHz 512 MHz Frequency G11 410 MHz 420 MHz 430 MHz G3 7 10 Volts 6 8 Volts 4 6 Volts G6 6 8 Volts 6 8 Volts 6 8 Volts G7 6 8 Volts 6 8 Volts 6 8 Volts G8 6 8 Volts 6 8 Volts 6 8 Volts G9 G10 6 8 Volts 6 8 Volts 6 8 Volts Vct Volts DC G11 6 8 Volts ...

Page 12: ... 2 5 4 Volts 2 5 4 Volts G9 G10 2 5 4 Volts 2 5 4 Volts 2 5 4 Volts J201 1 Volts DC G11 2 5 4 Volts 2 5 4 Volts 2 5 4 Volts G3 6 8 Volts 6 8 Volts 6 8 Volts G6 6 8 Volts 6 8 Volts 6 8 Volts G7 6 8 Volts 6 8 Volts 6 8 Volts G8 6 8 Volts 6 8 Volts 6 8 Volts G9 G10 6 8 Volts 6 8 Volts 6 8 Volts J201 3 Volts DC G11 6 8 Volts 6 8 Volts 6 8 Volts G3 13 4 Volts 13 4 Volts 13 4 Volts G6 13 4 Volts 13 4 Vo...

Page 13: ...19D902856G3 and G9 Refer to section 3 1 6 Low Pass Filter for filter specifications 4 2 1 Recommemded Test Equipment Network Analyzer Similar to HP8753B Tracking Generator Similar to HP8444A Spectrum Analyzer Similar to HP8567A 4 2 2 Test Set Up and Procedure A Connect two RG400 cables 1ft with type N connectors on both ends to the input output of the filter and to the input output of the analyzer...

Page 14: ...sim to 101JT500X C20 and C21 19A705108P40 Mica chip 120 pF 5 100 VDCW temp coef 0 50 PPM C C22 and C23 19A702052P26 Ceramic 0 1 µF 10 50 VDCW C24 19A702061P63 Ceramic 120 pF 5 50 VDCW temp coef 0 30 PPM C25 344A3126P38 Porcelain 100 pF 5 500 VDCW sim to 101JT500X C26 344A3126P62 Porcelain 1000 pF 5 500 VDCW sim to 102JT500X C27 344A3126P13 Porcelain 15 pF 5 500 VDCW sim to 100JT500X Used in G7 and...

Page 15: ... C41 344A3126P38 Porcelain 100 pF 5 500 VDCW sim to 101JT500X Used in G11 C42 thru C45 19A702052P26 Ceramic 0 1 µF 10 50 VDCW C46 and C47 344A3126P11 Porcelain 8 2 pF 5 500 VDCW sim to 8R2CT500X Used in G9 and G10 C46 and C47 344A3126P13 Porcelain 15 pF 5 500 VDCW sim to 100JT500X Used in G10 C48 19A702052P26 Ceramic 0 1 µF 10 50 VDCW C49 19A702236P40 Ceramic 39 pF 5 50 VDCW temp coef 0 30 PPM C C...

Page 16: ...19A700006P50 Mica teflon 39 pF 2 100 VDCW G7 C69 19A700006P55 Mica teflon 27 pF 2 100 VDCW Used in G9 C69 19A700006P57 Mica teflon 43 pF 2 100 VDCW Used in G8 C70 19A702061P49 Ceramic 56 pF 5 50 VDCW temp coef 0 30 PPM C71 19A702061P63 Ceramic 120 pF 5 50 VDCW temp coef 0 30 PPM C72 and C73 19A702052P26 Ceramic 0 1 µF 10 50 VDCW C75 thru C77 19A702052P26 Ceramic 0 1 µF 10 50 VDCW C78 and C79 19A70...

Page 17: ...8 Mica teflon 33 pF 2 100 VDCW Used in G3 C92 19A700006P55 Mica teflon 27 pF 2 100 VDCW Used in G9 and G10 C93 19A700006P59 Mica teflon 51 ohms 2 100 VDCW Used in G8 C93 19A700006P57 Mica teflon 43 pF 2 100 VDCW Used in G6 and G11 C93 19A700006P50 Mica teflon 39 pF 2 100 VDCW Used in G7 C93 19A700006P48 Mica teflon 33 pF 2 100 VDCW Used in G3 C93 19A700006P55 Mica teflon 27 pF 2 100 VDCW Used in G...

Page 18: ...Q5 19A700076P2 Silicon NPN sim to MMBT3904 low profile Q7 344A3058P1 Silicon NPN Q203 19A700055P1 Silicon PNP RESISTORS R1 and R2 19B800607P220 Metal film 22 ohms 5 1 8 w R3 thru R6 19B801486P101 Metal film 100 ohms 5 1 2 w R7 19B800607P183 Metal film 18K ohms 5 1 8 w R8 thru R10 19B800607P103 Metal film 10K ohms 5 1 8 w R11 19B800607P223 Metal film 22K ohms 5 1 8 w R12 thru R18 19B800607P103 Meta...

Page 19: ...m 100 ohms 5 1 2 w Used in G3 G6 G9 G11 R50 19B800607P1 Metal film Jumper Used in G8 G9 G10 and G11 R51 19B801486P331 Metal film 330 ohms 5 1 2 w Used in G3 G6 G9 G11 R52 19B801486P100 Metal film 10 ohms 5 1 2 w R53 19B800607P1 Metal film Jumper R54 19B800607P472 Metal film 4 7 ohms 5 1 8 w R55 19B800607P103 Metal film 10K ohms 5 1 8 w R56 19B800607P330 Metal film 33 ohms 5 1 8 w R57 19B800607P222...

Page 20: ... to Amphenol 31 318 W4 19B801695G11 Power Cable Includes the following 19B209268P115 Solderless terminal 19B209260P11 Solderless terminal 19A115959P2 Wire stranded 19A701503P2 Cable battery red 19A701503P10 Cable battery black 19B209268P116 Solderless terminal W10 19B801937P1 Power cable W13 19B801739P1 Power control cable MISCELLANEOUS 2 19D902420P6 Heatsink 5 19A702381P510 Screw thread forming T...

Page 21: ...12P5 Flatwasher M3 5 18 19A701863P10 Clip loop 20 19A702364P410 Machine screw 24 N405P37B6 Lock washer 25 L401P23B6 Split washer 26 19A700034P5 Hex nut JACKS J1 and J2 7777145P5 Receptacle sim to Amphenol 82 97 MISCELLANEOUS 2 19D903063P1 Casting 3 119D903064P1 Casting 5 19A702381P513 Screw thread forming TORX No M3 5 0 6 X 13 6 19A702364P210 Machine screw metric M2 5 0 45 X 10 7 19A134455P3 Flatw...

Page 22: ...C320618P7 Coil L3 thru L6 19B227929P1 Coil UHF FILTER BOARD 19D902853G9 CAPACITORS C1 19A700006P1 Mica 4 7 pF 10 100 VDCW C2 and C3 19A700006P3 Mica 6 8 pF 10 100VDCW INDUCTORS L1 thru L4 19C32061P17 Coil MISCELLANEOUS 11 19A702455P5 Nut self clinching 22 LBI 38674L ...

Page 23: ...62 Changed resistor R34 Resistor R34 was 3 9 ohms composition 19A700113P5 Changed transistor Q7 Transistor Q7 was 19A701940P1 Deleted inductors L26 and L27 Deleted capacitors C48 C49 C63 C74 Added capacitors C1 C25 C26 Added resistors R37 R51 R52 Added RT1 Added VR2 REV B POWER AMPLIFIER 19D902797G3 REV B POWER AMPLIFIER BOARD 19D902794G3 To update PWB for new split Changed PWB Changed capacitor C...

Page 24: ...50 REV A POWER AMPLIFIER 19D902797G10 REV A POWER AMPLIFIER BOARD 19D902794G10 To improve the collector match of the final stage at the upper end of the frequency range Changed capacitors C87 and C90 Capacitors C87 and C90 were 33 0 pF 19A700006P48 REV B POWER AMPLIFIER BOARD 19D902794G10 To improve the total current drain in the UHF 492 to 512 MHz split Changed capacitors in the PA section as fol...

Page 25: ... BOARD 19D902794G9 REV C POWER AMPLIFIER BOARD 19D902794G10 REV C POWER AMPLIFIER BOARD 19D902794G11 To improve reliability by making transistor Q7 run cooler when in the PA is in standby Changed resistor R1 from 27 ohms to 22 ohms Resistor R1 was 19B800607P270 Changed resistor R2 from 27 ohms to 22 ohms Resistor R2 was 19B800607P270 Changed resistor R31 from 33 ohms to 47 ohms Resistor R31 was 19...

Page 26: ...IC DATA 7 0 IC DATA U1 19A705457P1 P2 AND P4 PA Amplifier Module U100 19A705532P2 Voltage Regulator U3 19A701789P4 Quad Op Amp 26 LBI 38674L ...

Page 27: ...IC DATA U7 MMIC Amplifier 344A3907P1 LBI 38674L 27 ...

Page 28: ... Intentionally Left Blank 28 LBI 38674L ...

Page 29: ...ASSEMBLY DIAGRAM 8 0 ASSEMBLY DIAGRAMS 8 1 POWER AMPLIFIER 19D902797G3 G6 THROUGH G11 19D902797 Sh 3 Rev 16 LBI 38674L 29 ...

Page 30: ...ASSEMBLY DIAGRAM 8 2 COVER ASSEMBLY 19B801659G3 19B801659 Sh 2 Rev 3 19D902797 Sh 2 Rev 16 30 LBI 38674L ...

Page 31: ...SSEMBLY OUTLINE SCHEMATIC DIAGRAM 9 0 ASSEMBLY OUTLINE SCHEMATIC DIAGRAMS FOR LOW PASS FILTER MODULE 19D902856G3 COMPONENT SIDE 19D902853 Sh 2 Rev 19D902856 Sh 1 Rev 1 19D903623 Sh 1 Rev 1 LBI 38674L 31 ...

Page 32: ...OUTLINE DIAGRAM 10 0 OUTLINE DIAGRAM 10 1 POWER AMPLIFIER BOARD A1 19D902856G3 G6 G7 G8 G9 G10 G11 Lead Identification For Q7 used in G3 19D902794 Sh 2 Rev 21 32 LBI 38674L ...

Page 33: ...SCHEMATIC DIAGRAM 11 0 SCHEMATIC DIAGRAM 11 1 POWER AMPLIFIER ASSEMBLY 19D902 797G3 G6 THROUGH G11 19D903622 Sh 1 Rev 16 LBI 38674L 33 ...

Page 34: ...SCHEMATIC DIAGRAM 12 0 OUTLINE SCHEMATIC DIAGRAM FOR 470 512 MHz LOW PASS FILTER MODULE 19D902856G9 COMPONENT SIDE 19D902853 Sh 3 Rev 3 19B804157 Rev 0 19D903622 Sh 2 Rev 16 34 LBI 38674L ...

Page 35: ... Intentionally Left Blank LBI 38674L 35 ...

Page 36: ...M A COM Wireless Systems 221 Jefferson Ridge Parkway Lynchburg Virginia 24501 Outside USA 434 385 2400 Toll Free 800 528 7711 www macom wireless com Printed in U S A ...

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