Equipment information:

Amplifier Research 20T4G18 Amplifier
Manufacturer:
Amplifier Research
Model: 20T4G18
Date:
Category: Measurement instruments
Group: Amplifier
Description: Broadband Microwave Amplifier
Information:
                                    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. A reliable micro TWT
provides a conservative 20 watts
minimum at the amplifier output connector. Stated power
specifications are at fundamental
frequency.
The amplifier's front panel digital display shows forward
and reflected output plus extensive system
status information accessed through a series of menus via
soft keys. Status indicators include power
on, warm-up, standby, operate, faults, excess reflected
power warning and remote. Standard features
include a built-in IEEE-488 (GPIB) interface, 0dBm input,
VSWR protection, gain control, RF
output sample port, auto sleep, plus monitoring of TWT helix
current, cathode voltage, collector
voltage, heater current, heater voltage, baseplate
temperature and cabinet temperature. Modular
design of the power supply and RF components allow for easy
access and repair. Use of a switching
mode power supply results in significant weight reduction.
Housed in a stylish contemporary cabinet this unit is
designed for benchtop use but can be removed
from the cabinet for rack mounting. The Model 20T4G18
provides readily available RF power for a
variety of applications in Test and Measurement, (including
EMC RF susceptibility testing),
Industrial and University Research and Development, and
Service applications.

These manuals are available for the above equipment:

Amplifier Research -- 20T4G18 -- Service and User Manual
File name: AmplifierResearch-8019-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 60
Size: 1.42 Mbytes (1488776 Bytes)
Language: english
Revision:
Manual-ID/Number: 1008254-501_
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: df4848cb12ecc75167d01e18bb585388
ed2kID: 0f5682f50319460ea9995da74744510d
Downloads: 0 since 10 September 2016
Information:
TABLE OF
CONTENTS.......................................................................................................
i
1..... DESCRIPTION AND
SPECIFICATIONS.................................................................1
1.1 TWTA
Description..........................................................................................................
1
1.2 Suggested
Applications...................................................................................................1
1.3
Specifications...................................................................................................................1
1.4
Accessories.......................................................................................................................1
1.5 Test Data
Sheet...............................................................................................................
2
2.2.12.22.3THEORY OF O
PERATION.........................................................................................
5
Design of the
amplifier....................................................................................................5
Description of the RF
Circuit.........................................................................................
5
Description of the Power
Supply...................................................................................6
3.
OPERATION....................................................................................................................7
3.1 Warnings and
Cautions...................................................................................................7
3.2
Installation........................................................................................................................8
3.2.1
Unpacking.....................................................................................................................8
3.2.2
Mounting.......................................................................................................................8
3.2.3 Cooling
Requirements..................................................................................................9
3.2.4 AC Line Power
Connections.....................................................................................10
3.2.5 RF Output
Connections.............................................................................................
10
3.2.6 External Interlock
Connector....................................................................................10
3.3 Front Panel
Features......................................................................................................11
3.4 Front Panel Display and Soft K
eys.............................................................................
12
3.5 Rear Panel
Features.......................................................................................................16
3.6 Initial Turn On and Warm-up
Procedure....................................................................16
3.7 Emergency Bypass
Operation......................................................................................17
3.8 Remote IEEE-488
Operation.......................................................................................18
3.9 TWTA General
Considerations....................................................................................23
4.4.14.24.34.44.5M
AINTENANCE..........................................................................................................
25
Safety Warning
.............................................................................................................
25
Unauthorized
Repairs....................................................................................................25
Preventive
Maintenance...............................................................................................
25
Troubleshooting............................................................................................................
26
Non-Repairable
Modules.............................................................................................
27
5. TECHNICAL
DOCUMENTATION.........................................................................
29
5.1 Top Level Build
Tree....................................................................................................30
5.2
Schematics......................................................................................................................31
5.3 Wiring
Diagrams...........................................................................................................
33
5.4 Parts
Lists.......................................................................................................................35
5.4.1 Parts List, HPA Logic and Control Module,
A16485-000..................................... 36
5.4.2 Parts List, Power Supply (Short) For TWT 5172,
A23720-099........................... 38
5.4.3 Parts List, Emergency Bypass Board,
A24830-001................................................39
5.4.4 Parts List, Emergency Bypass Board,
A24830-002................................................40
5.4.5 Parts List, HPA Interface Board (Plastic),
A25444-000........................................ 41
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
5.5 Recommended Spare
Parts...........................................................................................
46
5.6 Sample Program for IEEE-488
Communication........................................................
47

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