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Amplifier Research 200T4G18 Operating And Service Manual

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Operating and
Service Manual
20T4G18
Model
1008254-501
Part Number
Serial Number
http://www.Datasheet4U.com

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  • Page 1 Operating and Service Manual 20T4G18 Model 1008254-501 Part Number Serial Number http://www.Datasheet4U.com...
  • Page 2 Model 20T4G18 http://www.Datasheet4U.com...
  • Page 3 160 School House Road Souderton, PA 18964 declare that our product; the Model 200T4G18 amplifier to which this declaration relates is in compliance with the requirements of the EEC EMC Directive (89/336/EEC) and Low Voltage Directive (73/23/EEC) in accordance with the...
  • Page 4 Model 20T4G18 http://www.Datasheet4U.com...
  • Page 5 Dangerous voltages are present. Use extreme care. Protection provided by the equipment may be impaired if used in a manner not specified by Amplifier Research. CAUTION: The caution symbol denotes a potential hazard. Attention must be given to INTENDED PURPOSES the statement to prevent damage, destruction, or harm.
  • Page 6 Model 20T4G18 http://www.Datasheet4U.com...
  • Page 7 ADDITIONAL WARNINGS & NOTES WARNING: This equipment operates at potentially lethal voltages. Only trained, qualified personnel should operate, maintain, or service it. Hazardous energy may be present while protective covers are removed from the equipment even if disconnected from the power source. Contact may result in personal injury.
  • Page 8 Model 20T4G18 http://www.Datasheet4U.com...

  • Page 9: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS ....................i DESCRIPTION AND SPECIFICATIONS..............1 TWTA Description.....................1 Suggested Applications....................1 Specifications ......................1 Accessories.........................1 Test Data Sheet ......................2 THEORY OF OPERATION..................5 Design of the amplifier....................5 Description of the RF Circuit..................5 Description of the Power Supply ................6 OPERATION......................7 Warnings and Cautions ....................7 Installation........................8...
  • Page 10 Model 20T4G18 5.4.6 Parts List, HPA 20W 4.2-18GHZ (AR), A28825-300..........44 5.4.7 Parts List, Microwave Power Assembly, AR, A28826-000........45 Recommended Spare Parts..................46 Sample Program for IEEE-488 Communication............47 ILLUSTRATIONS Figure 3-1 - Rear View of HPA ..................9 Figure 3-2 - TWTA Front Panel Features .................11 Figure 3-3 - Front Panel Display Screens................12 Figure 3-4 - TWTA Rear Panel Features................15 TABLES...

  • Page 11: Description And Specifications

    • Equipment calibration • General laboratory instrumentation SPECIFICATIONS Refer to the Amplifier Research Data Sheet on the following pages for detailed specifications. ACCESSORIES Amplifier Research offers a number of accessories for use with this amplifier including: • Directional coupler •...

  • Page 12: Test Data Sheet

    Model 20T4G18 TEST DATA SHEET A Test Data Sheet for a specific unit is prepared at the time of manufacture and is included with the unit's copy of this manual. Rev B http://www.Datasheet4U.com...
  • Page 13 MODEL 20T4G18 M1, M2 160 School House Road, Souderton, PA 18964-9990 USA Phone 215-723-8181•FAX 215-723-5688 20 WATTS CW 4.2 - 18 GHz The Model 20T4G18 is a self contained, forced air cooled, broadband traveling wave tube (TWT) microwave amplifier designed for applications where wide instantaneous bandwidth, high gain and moderate power output are required.
  • Page 14 SPECIFICATIONS Model 20T4G18 POWER (fundamental), CW, @ OUTPUT CONNECTOR Nominal ......................42 watts Minimum ......................20 watts Linear @ 1dB Compression ................10 watts minimum FLATNESS ......................±9 dB maximum, 4.2 - 18 GHz ±5dB maximum, 8.0 - 18 GHz FREQUENCY RESPONSE................

  • Page 15: Theory Of Operation

    2. THEORY OF OPERATION DESIGN OF THE AMPLIFIER The model 20T4G18 TWT amplifier consists of four principal subsystems. Two of these subsystems, the microwave power assembly (A28826-000) and the TWT power supply (A23720-099) are discussed in sections 2.2 and 2.3, respectively. The other two subsystems are the microprocessor control system and the TWTA packaging.

  • Page 16: Description Of The Power Supply

    Model 20T4G18 Amplifier gain is determined by the solid state preamp (SSA), which has a voltage-controlled attenuator. The control head determines the output of a digital-to-analog converter (DAC) on the HPA interface board. The output of the DAC controls the SSA attenuator. The emergency bypass board (A24830) mounted behind the front panel is provided with a circuit that increases the attenuation so that forward power is limited to a level on the order of 50 watts.

  • Page 17: Operation

    3. OPERATION WARNINGS AND CAUTIONS Throughout this manual, the symbol: WARNING: indicates that a hazard exists that may result in personal injury or loss of life. CAUTION: indicates that failure to follow procedures may result in damage to the equipment. WARNING: DANGER - High Voltage Present: Electrical equipment in this TWTA generates and stores high-voltage energy that can result in fatal electrocution.

  • Page 18: Installation

    Model 20T4G18 INSTALLATION 3.2.1 Unpacking Upon receiving the TWTA, unpack the unit and inspect it for obvious signs of external damage. If damage is observed, notify the carrier and contact an authorized service representative. Save and store the shipping container in case the unit needs to be returned in the future for calibration or repair.

  • Page 19: Cooling Requirements

    Model 20T4G18 RF OUTPUT IEEE-488 RF SAMPLE OUT TYPE TNC RF INPUT 0 DBM MAX AC POWER IN 100-255 VAC 50/60 HZ. 500 VA SAFETY GROUND EXTERNAL INTERLOCK 23.675 0.865 3.50 USE 8-32 FH SCREWS, 3/8-1/2" THREAD IN CABINET TO ATTACH REAR SUPPORT BRACKETS HERE (BOTH SIDES) Figure 3-1.

  • Page 20: Ac Line Power Connections

    Model 20T4G18 3.2.4 AC Line Power Connections AC line power connection to the TWTA is made at the AC inlet J1, which is a female IEC-320 connector. A line cord suitable for the type of AC outlet used, and consistent with local electrical codes, must be obtained to mate with J1.

  • Page 21: Front Panel Features

    Model 20T4G18 FRONT PANEL FEATURES Refer to Figure 3-2 below. STANDBY OPERATE Model 20T4G18 20 Watts INHIBIT 4.2 - 18 GHz LOCAL REMOTE EXIT MAIN POWER Figure 3-2. Front Panel Features Table 1. Front Panel Features Item Title Function MAIN POWER Switchable 16 A.

  • Page 22: Front Panel Display And Soft Keys

    Model 20T4G18 FRONT PANEL DISPLAY AND SOFT KEYS The purpose of the front panel display is to permit the operator to access extensive information about the condition and operation of the TWTA. To accomplish this, a number of informational screens are programmed.
  • Page 23 Model 20T4G18 MENU 1 Forward power (watts, dBm or bar graph) Reverse power (watts, dBm or % of forward power) System status (if a latched fault exists, MENU 1 is displayed with the system shutdown message) MENU 2 Console hours (active when AC power is on) Operate hours (active when HV is on) MENU 3 Cabinet temperature (°C or °F)
  • Page 24 Model 20T4G18 To deactivate Sleep Mode locally: Press the ON soft key to de-activate Sleep Mode. Amplifier will return to MENU 1. When de-activating the Sleep Mode the heaters will require approximately a 5 minute heater time delay. Wait the full 5 minutes prior to selecting OPERATE.

  • Page 25: Figure 3-4 - Twta Rear Panel Features

    Model 20T4G18 Factory Service Screens - A number of screens intended for factory service and calibration are behind passwords and are not accessible to the user. System Malfunction Screens - A number of screens are reserved to display error messages. These messages are not normally seen and indicate a malfunction of the TWTA.

  • Page 26: Rear Panel Features

    Model 20T4G18 REAR PANEL FEATURES See Figure 3-4 below Figure 3-4. Rear Panel Features Table 2. TWTA Rear Panel Features Item Title Function AC POWER IN AC power input connector: IEC-320 connector IEEE-488 Remote control connector: 24 pin hermaphrodite EXTERNAL INTERLOCK Connector to remote temperature switch protecting the isolator load: D-sub 15-pin female —...

  • Page 27: Emergency Bypass Operation

    Model 20T4G18 Set keylock to LOCAL. Switch on the MAIN POWER circuit breaker. The fan will operate. The front panel display will show several identification messages and then the MENU 1 screen. The third line will indicate that the heater time delay is active.

  • Page 28: Remote Ieee-488 Operation

    Model 20T4G18 CAUTION: Do not adjust 20-turn pot R11; its function is to set the foldback RF output level, and it is calibrated at the factory. REMOTE IEEE-488 OPERATION The TWTA is provided with a communication interface that conforms electrically to the IEEE-488 standard. It permits remote emulation of OPERATE, STANDBY, and RESET push-buttons as well as access to parameter measurements, system faults, gain adjustment, and control unit status.
  • Page 29 Model 20T4G18 Command Function Units Response format RDHTDREM Returns remaining heater time delay sec. HTD=[ ]s RDPOD Returns forward power out (dBm) Po=[ ]dBm RDPOW Returns forward power out (W) watts Po=[ ]W RDPRD Returns reverse power out (dBm) Pr=[ ]dBm RDPRW Returns reverse power out (W) watts...

  • Page 30: Table 4. Catalog Of Status Codes

    Model 20T4G18 Table 4. Catalog of Status Codes (The RDSTAT command causes the TWTA to return a string in the form STATUS=[code], where [code] is an ASCII number whose meaning is given below) Status Code Meaning No command was given. Last command was successful.

  • Page 31: Table 6. Catalog Of System State Codes

    Model 20T4G18 Table 6. Catalog of System State Codes (The RDLOGIC command causes the TWTA to send a string containing an operational state code consisting of 4 ASCII characters representing hex digits. The response is in the form "Sys:[w][x][y][z][eol]" where the hex values of [w],[x],[y] and [z]are formed as shown below) z bit Meaning 0 (LSB)
  • Page 32 Model 20T4G18 Table 8. *STB?; Response Codes (The command *STB?; causes the TWTA to send a string containing an operational state code consisting of 2 ASCII characters representing hex digits. The response is in the form “STATUS:[x][y][eol] ” where the hex values of [x] and [y] are formed as shown below) x bit Meaning...

  • Page 33: Twta General Considerations

    Operate mode may be selected again. This procedure maybe repeated, if needed up to 25 times, until the Operate mode is actually set. If this condition persists, contact Amplifier Research Service for additional assistance. (See Explanation of…, below) Noise Power Density (NPD): TWTAs produce rf noise over their operating frequency range, as specified by the Noise Power Density (NPD).
  • Page 34 Model 20T4G18 state amplifiers, and is inherent in present TWTAs. The noise may surprise users new to TWTAs when it accumulates and results in a significant indication in a broadband measurement device – such as a power meter or field probe. The error produced by this indication is not significant when operating near rated TWTA power levels, but may cause difficulty when trying to operate high power TWTAs at low output power levels.

  • Page 35: Maintenance

    4. MAINTENANCE The TWTA does not require routine scheduled maintenance. The only moving parts are the elements of switches, relays and blowers. Preventive maintenance is recommended in Paragraph 4.3. The TWTA is basically a factory repairable unit. However, since limited logic schematics and partial parts information is supplied in this manual (Section V) some user service organizations may choose to perform their own corrective maintenance.

  • Page 36: Troubleshooting

    Model 20T4G18 To open the enclosure: 1. Remove the amplifier from the cabinet or rack as follows: NOTE: Due to the weight of the unit, the removal of the amplifier from the cabinet or rack is a two person operation. Disconnect power, RF, and any other interface connectors.

  • Page 37: Non-Repairable Modules

    Model 20T4G18 The service technician should become familiar with the internal mechanical construction to permit correct re- assembly. Limited troubleshooting may be conducted, with caution, based on the failure symptom and an understanding of the logic/schematic diagrams. NON-REPAIRABLE MODULES The High Voltage Diode/Cap Assembly (A21455-100), the High Voltage Filter Assembly (A21454), and the Heater Supply (A10010-000) are encapsulated modules and are not repairable.
  • Page 38 Model 20T4G18 Rev B http://www.Datasheet4U.com...

  • Page 39: Technical Documentation

    5. TECHNICAL DOCUMENTATION NOTE: The purpose of this technical documentation section is to provide a guide to the TWTA for technician- level servicing. It is intended for use by qualified technical personnel who must troubleshoot and repair the TWTA in the field. Such repairs are typically limited to replacement of modules or major components.

  • Page 40: Top Level Build Tree

    Model 20T4G18 TOP LEVEL BUILD TREE BUILD TREE FOR SERIAL NUMBER HPA 20W 4.2-18GHZ (AR) A28825-300 A28825-300 HPA 20W 4.2-18GHZ (AR) A23720-099 POWER SUPPLY(SHORT) FOR TWT 5172 1A1A1 A23711-000 MOTHER BOARD AND HEAT SINK 1A1A2 A23687-001 LOW VOLTAGE POWER SUPPLY MODULE 1A1A3 A16485-000 HPA LOGIC AND CONTROL MODULE...

  • Page 41: Schematics

    Model 20T4G18 SCHEMATICS 10-16485-000 HPA Logic and Control (A16485-000) 10-25444-000 HPA Interface (A22444-000) 10-24830 Emergency Bypass Board (A24830-001) 10-24830-002 Emergency Bypass Board (A24830-002) 10-28825-300 HPA 20T Series (A28825-300) Rev B http://www.Datasheet4U.com...
  • Page 42 Model 20T4G18 Rev B http://www.Datasheet4U.com...

  • Page 43: Wiring Diagrams

    Model 20T4G18 WIRING DIAGRAMS 20-23720-099 TWT Power Supply AR 20T Series (A23720-099) Rev B http://www.Datasheet4U.com...
  • Page 44 Model 20T4G18 Rev B http://www.Datasheet4U.com...

  • Page 45: Parts Lists

    Model 20T4G18 PARTS LISTS A16485-000 HPA Logic and Control Assembly A23720-099 Power Supply (Short) for TWT 5172 A24830-001 Emergency bypass board A24830-002 Emergency bypass board A25444-000 HPA Interface Board (Plastic) A28825-300 HPA 20W 4.2-18GHZ (AR) A28826-000 Microwave Power Assembly Rev B http://www.Datasheet4U.com...

  • Page 46: Parts List, Hpa Logic And Control Module, A16485-000

    Model 20T4G18 5.4.1 Parts List, HPA Logic and Control Module, A16485-000 REF. DESIG. ETM P/N DESCRIPTION QUANTITY B16485-000 HPA LOGIC AND CONTROL BOARD C16333-000 CAP,33MF,25V,AERL,(NICHICON UVX1E330M) C2, C5, C15, C58 C31028-000 CAP,1000PF,200VDC,10%,CER,1% FAILURE,(KEMET CKR05 SERIES W/"V" OPTION) C3, C9, C10, C13, C14, C17, C31032-000 CAP,0.01MF,200VDC,10%,CER,1% FAILURE,(KEMET C19, C21, C22, C27, C28,...
  • Page 47 Model 20T4G18 REF. DESIG. ETM P/N DESCRIPTION QUANTITY R21953-000 RES,9.53K,1/2W,1%,MF,100PPM,(DALE RN55D) R47, R48 R22200-000 RES,20K,1/2W,1%,MF,100PPM,(DALE RN55D) R79, R80 R22470-000 RES,47K,1/2W,1%,MF,100PPM,(DALE RN55D) R42, R60, R61, R89 R23100-000 RES,100K,1/2W,1%,MF,100PPM,(DALE RN55D) R33, R55 R23698-000 RES,698K,1/2W,1%,MF,100PPM,(DALE RN55D) R23750-000 RES,750K,1/2W,1%,MF,100PPM,(DALE RN55D) R23845-000 RES,845K,1/2W,1%,MF,100PPM,(DALE RN55D) R23953-000 RES,953K,1/2W,1%,MF,100PPM,(DALE RN55D) R12, R15 R32020-000...

  • Page 48: Parts List, Power Supply (Short) For Twt 5172, A23720-099

    Model 20T4G18 5.4.2 Parts List, Power Supply (Short) For TWT 5172, A23720-099 REF. DESIG. ETM P/N DESCRIPTION QUANTITY A10010-000 HEATER POWER SUPPLY MODULE A10017-100 PWM BOARD ( SPECIAL ) A16485-000 HPA LOGIC AND CONTROL MODULE A21455-100 HIGH VOLTAGE DIODE/CAP ASSY FOR 100WKU A21457-001 HV FILTER MODULE A23683-100...

  • Page 49: Parts List, Emergency Bypass Board, A24830-001

    Model 20T4G18 5.4.3 Parts List, Emergency Bypass Board, A24830-001 REF. DESIG. ETM P/N DESCRIPTION QUANTITY B24830-000 EMERGENCY BYPASS BOARD C3-C5 C04105-000 CAP,0.1MF,100V,20%,MON,(KEMET C331C104M1R5CA) C30010-000 CAP,10MF,35V,TANT,RADIAL,(NEMCO TB10-35K1) C31028-000 CAP,1000PF,200VDC,10%,CER,1% FAILURE,(KEMET CKR05 SERIES W/"V" OPTION) C31032-000 CAP,0.01MF,200VDC,10%,CER,1% FAILURE,(KEMET CKR06 SERIES W/"V" OPTION) C31040-000 CAP,1MF,50VDC,10%,CER,1% FAILURE,(KEMET CKR06 SERIES W/"V"...

  • Page 50: Parts List, Emergency Bypass Board, A24830-002

    Model 20T4G18 5.4.4 Parts List, Emergency Bypass Board, A24830-002 REF. DESIG. ETM P/N DESCRIPTION QUANTITY B24830-000 EMERGENCY BYPASS BOARD C3-C5 C04105-000 CAP,0.1MF,100V,20%,MON,(KEMET C331C104M1R5CA) C30010-000 CAP,10MF,35V,TANT,RADIAL,(NEMCO TB10-35K1) C1, C2 C31032-000 CAP,0.01MF,200VDC,10%,CER,1% FAILURE,(KEMET CKR06 SERIES W/"V" OPTION) C31040-000 CAP,1MF,50VDC,10%,CER,1% FAILURE,(KEMET CKR06 SERIES W/"V" OPTION) D1, D2 D14454-000 DIODE,AXIAL,(MOTOROLA 1N4454)

  • Page 51: Parts List, Hpa Interface Board (Plastic), A25444-000

    Model 20T4G18 5.4.5 Parts List, HPA Interface Board (Plastic), A25444-000 REF. DESIG. ETM P/N DESCRIPTION QUANTITY B25444-000 HPA INTERFACE BOARD C161 C03105-000 CAP,0.01MF,100V,CER,10%,RADIAL,(AVX SR201C103KAA) C171 C04223-000 CAP,0.22MF,35V,TANT,RADIAL, [JAMCO 33507] C20, C32, C100 C05153-000 CAP,1.5MF,35V,TANT,RADIAL,(AVAX, TAP155K035SCS) C129, C163 C05223-000 CAP,2.2MF,35V,10%,SOLID SEALED TANT,RADIAL,(SPRAGUE 199D225X9035BA1) C80, C81, C164 C06103-000...
  • Page 52 Model 20T4G18 REF. DESIG. ETM P/N DESCRIPTION QUANTITY J16214-000 TEST JACK,YELLOW,VERTICAL,(EF JOHNSON 105- 0857-001) J16215-000 TEST JACK,GREEN,VERTICAL,(EF JOHNSON 105- 0854-001) J16216-000 TEST JACK,BLUE,VERTICAL,(EF JOHNSON 105- 0860-001) J18167-000 D-SUB,37 PIN,FEMALE,PCB MOUNT,RIGHT ANGLE (AMP 745784-4) J18180-000 CONN,D-SUB,15 PIN,MALE,STRAIGHT,PCB MOUNT (POSITRONIC MD15M3000) J31013-000 CONN,D-SUB,25 PIN,MALE,RIGHT ANGLE,PCB MOUNT,[AMP 747238-4] XJ1-XJ4...
  • Page 53 Model 20T4G18 REF. DESIG. ETM P/N DESCRIPTION QUANTITY U6, U19, U34, U39, U60 U20148-000 IC,HEX INVERTER,SCHMIDTT TRIGGER,(74HC14) (SSD) U20730-000 IC,DUAL J-K FLIP FLOP W/RESET,(7473) (SSD) U21328-000 IC,QUAD 2 INPUT NAND,SCHMIDTT TRIGGER,(74HC132) (SSD) U21388-000 IC,3 TO 8 DECODER/DEMULTIPLEXER,INVERTING,(74HC138) (SSD) U21536-000 IC,DUAL 4 INPUT DIGTAL MULTIPLEXER,(74F153) (SSD) U22598-000 IC,8 BIT ADDRESSABLE LATCH...

  • Page 54: Parts List, Hpa 20W 4.2-18Ghz (Ar), A28825-300

    Model 20T4G18 5.4.6 Parts List, HPA 20W 4.2-18GHZ (AR), A28825-300 REF. DESIG. ETM P/N DESCRIPTION QUANTITY A23720-099 POWER SUPPLY(SHORT) FOR TWT 5172 A24830-001 EMERGENCY BYPASS BOARD A24830-002 EMERGENCY BYPASS BOARD A25403-302 TWTA CONTROL ASSY 20 CIJ/50X A25444-000 HPA INTERFACE BOARD (PLASTIC FIBERS) A25498-000 WIRING KIT 20W C/I/J A28826-000...

  • Page 55: Parts List, Microwave Power Assembly, Ar, A28826-000

    Model 20T4G18 5.4.7 Parts List, Microwave Power Assembly, AR, A28826-000 REF. DESIG. ETM P/N DESCRIPTION QUANTITY E00888-007 CABLE,RF FLEX, 7,SMA,MALE TO MALE,20 GHZ,50 OHM,BLUE FEP TEFLON (DICAR EZ402-2121-07) E00888-009 CABLE,RF FLEX, 9,SMA,MALE TO MALE,20 GHZ,50 OHM,0.141 CABLE,INSULATED JACKET,[SRC 150- 150-150090] E00888-012 CABLE,RF FLEX,12,SMA,MALE TO MALE,20 GHZ,50 OHM,0.141 CABLE,INSULATED JACKET,[SRC 150-...

  • Page 56: Recommended Spare Parts

    Model 20T4G18 RECOMMENDED SPARE PARTS A16491-000 Auxiliary power supply module (low voltage power supply). A21455-100 High voltage diode/cap assembly A21454-000 High voltage filter assembly A10010-000 Heater power supply module Y10057-000 Spinnaker DC blower (Comair Rotron model SPD24B1, part no. 032183) Rev B http://www.Datasheet4U.com...

  • Page 57: Sample Program For Ieee-488 Communication

    Model 20T4G18 SAMPLE PROGRAM FOR IEEE-488 COMMUNICATION 1000 ! *********************************************** 1010 IEEE-488 COMMUNICATIONS SOFTWARE 1030 7/24/92 AARON D. McCLURE 1040 ! *********************************************** 1041 DIM F$[80] 1042 DIM A$[80] 1050 CLEAR SCREEN 1060 INPUT "INPUT COMMAND TO SEND TO POWER SUPPLY. EXIT TO QUIT.",A$ 1070 IF A$="EXIT"...
  • Page 58 Model 20T4G18 Rev B http://www.Datasheet4U.com...
  • Page 59 If warranty service is not available in the country where the equipment is to be used, it must be returned to Amplifier Research. Warranty service will be provided only for defective goods which are returned within the warranty period, freight costs prepaid to Amplifier Research or its designated repair facility.
  • Page 60 http://www.Datasheet4U.com...

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