1. DL manuals
  2. M/A-Com
  3. Amplifier
  4. 19D902797G10
  5. Maintenance Manual

M/A-Com 19D902797G10 Maintenance Manual

Manual is about: M/A-Com 110/90/75 watt Power Amplifier Maintenance Manual

Summary of 19D902797G10

  • Page 1

    Maintenance manual lbi-38674l 450-470 mhz, 110 watt power amplifier 19d902797g3 403-425 mhz, 90 watt power amplifier 19d902797g6 425-450 mhz, 90 watt power amplifier 19d902797g7 380-400 mhz, 75 watt power amplifier 19d902797g8 470-494 mhz, 90 watt power amplifier 19d902797g9 492-512 mhz, 90 watt pow...

  • Page 2

    Note repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier. Any repairs, alterations or substitution of recommended parts made by the user to this equipment not approved by the manufacture could void the user’s authority to operate t...

  • Page 3: 1.0 Specifications

    Specifications 1.0 specifications 1 item specification frequency 450 mhz - 470 mhz (g3) 403 mhz - 425 mhz (g6) 425 mhz - 450 mhz (g7) 380 mhz - 400 mhz (g8) 470 mhz - 494 mhz (g9) 492 mhz - 512 mhz (g10) 410 mhz - 430 mhz (g11) output power (rf) 65 watts - 130 watts (g3) 55 watts - 110 watts (g6, g7...

  • Page 4: 2.0 Description

    Description 2.0 description the uhf power amplifier assembly is a wide band rf power amplifier operating over the 380-400, 410-430, 403-425, 425-450, 450-470, 470-494, and 492-512 mhz range without tuning. Its main function is to amplify the 10 mw fm signal from the transmitter synthesizer to the ra...

  • Page 5: 3.0 Circuit Analysis

    Circuit analysis 3.0 circuit analysis 3.1 power amplifier the power amplifier section of the pa board consists of an exciter, a small signal gain stage, a low level amplifier, a driver, and the power amplifier finals. All these gain stages have an input and output impedance of 50 ohms. Figure 1 is a...

  • Page 6

    Circuit analysis 3.1.5 power amplifier finals (q2 & q3) each of the power amplifier final devices is capable of producing 5 to 6 db of gain. The output signal from the splitter is impedance-matched to each of the finals. Under optimum conditions each final amplifies the input signal to between 50 an...

  • Page 7

    Circuit analysis 3.2 power control the power control circuitry performs three basic functions. It keys and unkeys the pa, sets the pa output power, and protects the pa against adverse conditions. 3.2.1 keying and unkeying the pa to key the pa, the digital controller places 5 volts on the pa key line...

  • Page 8

    Circuit analysis the microstrip directional coupler samples the output power and produces a voltage, vf, proportional to the forward output power. The power control compares the forward voltage, vf, to a reference voltage at u3. The output of u3 controls the current flow thru q5 and the output of q2...

  • Page 9

    Circuit analysis 3.2.5.2 pa key (interface connector pin 2) this line is used to key and unkey the pa. Unkey = 0 volt and key = 5 volts. The driver of this line must be capable of supplying 5 volts at 1.0 ma. The appropriate key sequence requires rf from the transmit synthesizer be input to the pa b...

  • Page 10: 4.0

    Troubleshooting 4.0 troubleshooting 4.1 troubleshooting guide symptom areas to check indications 1. Measure the transmitter output power before the duplexer or antenna switch (for simplex mode). The presence of power at this port is an indication of a defective duplexer, switch, or cables. 2. Measur...

  • Page 11

    Troubleshooting table 1 - uhf power amplifier voltage chart parameter (50 ohm, -30 °c to +60°c) reference symbol readings (volts dc) supply voltage a+ 13.4 v ±20% control voltage vct1 0 - 12 v forward voltage vf 3 - 7 v reverse voltage vr 2 - 6 v power sense j201-1 2.5 - 4 v pa key j201-2 5 v power ...

  • Page 12

    Troubleshooting continued group low mid high g3 2 - 3 volts 2 - 3 volts 2 - 3 volts g6 2 - 3 volts 2 - 3 volts 2 - 3 volts g7 2 - 3 volts 2 - 3 volts 2 - 3 volts g8 2 - 3 volts 2 - 3 volts 2 - 3 volts g9 & g10 2 - 3 volts 2 - 3 volts 2 - 3 volts vr (volts dc) g11 2 - 3 volts 2 - 3 volts 2 - 3 volts ...

  • Page 13

    Troubleshooting table 3 - rated power for mastr iii uhf base station frequency mhz standard @j2 adjustable range@j104 with duplexer with isolator with duplexer and isolator 450-470 110w 65-130w 75w 100w 70w 425-450 90w 55-110w 60w 82w 55w 403-425 90w 55-110w 60w 82w 55w 380-400 75w 45-90w 50w 68w 47...

  • Page 14: 5.0 Parts List

    Parts list 5.0 parts list 2 110-watt uhf power amplifier 19d902797g3 90-watt uhf power amplifier 19d902797g6, g7 & g9-g11 75-watt uhf power amplifier 19d902797g8 issue 8 symbol part number description assemblies a1 power amplifier board 19d902794g3, g6 - g11 - - - - - - - - - - capacitors - - - - - ...

  • Page 15

    Parts list symbol part number description c29 344a3126p11 porcelain: 8.2 pf ±5%, 500 vdcw; sim to 8r2ct500x. (used in g7). C30 344a3126p15 porcelain: 12 pf ±5%, 500 vdcw; sim to 120jt500x. (used in g8). C30 344a3126p11 porcelain: 8.2 pf ±5%, 500 vdcw; sim to 8r2ct500x. (used in g3, g9, g10). C31 344...

  • Page 16

    Parts list symbol part number description c65 344a3126p5 porcelain:4.7 pf ±0.25%, 500 vdcw; sim to 4r7ct500x. (used in g9, g10). C66 19a700006p58 mica/teflon: 47 pf ±2%, 100 vdcw. (used in g8). C66 19a700006p55 mica/teflon: 27 pf ±2%, 100 vdcw. (used in g9 and g10). C66 19a700006p50 mica/teflon: 39 ...

  • Page 17

    Parts list symbol part number description c88 19a700006p48 mica/teflon: 33 pf ±2%, 100 vdcw. (used in g9 and g10). C89 19a700006p59 mica/teflon: 51 ohms ±2%, 100 vdcw. (used in g6, g8, and g11). C89 19a700006p57 mica/teflon: 43 pf ±2%, 100 vdcw. (used in g7). C89 19a700006p50 mica/teflon: 39 pf ±2%,...

  • Page 18

    Parts list symbol part number description l5 19a701091g1 coil (used in g6, g7, g8 and g11). L6 19c320617p10 coil (used in g6, g7, g8, g10 and g11). L7 19a705470p4 coil, fixed: 15 nh; sim to toko 380nb-15nm. L8 19a705470p8 coil, fixed: 39 nh; sim to toko 380nb-39nm. L14 19c320617p17 coil. L15 thru l1...

  • Page 19

    Parts list symbol part number description r32 19a700050p17 wirewound: 2.2 ohms ±10%, 2 w. (used in g3, g9, and g10). R33 19b800607p682 metal film: 6.8k ohms ±5%, 1/8 w. R34 19b801486p100 metal film: 10 ohms ±5%, 1/2 w. R35 19a700050p17 wirewound: 2.2 ohms ±10%, 2 w. (used in g3, g9). R36 19b801486p1...

  • Page 20

    Parts list symbol part number description - - - - - - - - - - - - - - resistors - - - - - - - - - - - - - - r28 and r29 19a143832p6 power: 100 ohm ±5%, 40 w. - - - - - - - - - - -integrated circuits - - - - - - - - - - - - u1 19a705457p2 pa module: 440-470 mhz; sim to m57704h. (used in g3). U1 19a70...

  • Page 21

    Parts list symbol part number description 41 19a700033p6 loackwasher, external tooth, m3.5. 45 n405p5b6 lockwasher. 46 19a701312p4 flatwasher: 3.2 id. 50 19a702381p408 tap screw, torx drive, m3-0.5 x 8. 51 19a705106p1 resistor spacer. Cover 19b801659g3 2 19d902421p1 power amplifier cover. 4 19a70238...

  • Page 22

    Parts list symbol part number description - - - - - - inductors - - - - - - l1 and l2 19c320618p7 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 ±...

  • Page 23: 6.0 Production Changes

    Production changes 6.0 production changes changes in the equipment to improve performance or to simplify circuits are identified by a "revision letter"which is stamped after the model number of the unit. The revision stamped on the unit includes all previous revisions. Refer to the parts list for th...

  • Page 24

    Production changes rev. A - power amplifier 19d902797g7 rev. A - power amplifier board 19d902794g7 to update pwb to new band splits and add power monitor circuitry. Added dual operational amplifier u2 added capacitor c48. Added resistors r54, r53, r55. Rev. A - power amplifier 19d902797g8, g9, g11 r...

  • Page 25

    Production changes rev. G - power amplifier 19d902797g9 rev. G - power amplifier 19d902797g10 rev. G - power amplifier 19d902797g11 rev. G - power amplifier board 19d902794g3 rev. C - power amplifier board 19d902794g6 rev. C - power amplifier board 19d902794g7 rev. C - power amplifier board 19d90279...

  • Page 26: 7.0 Ic Data

    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

    Assembly, 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..