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GT-1050B
Operation Manual
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Giga-tronics GT-1050B Operation Manual

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Giga-tronics GT-1050B Microwave Power Amplifier
Operation Manual
GT-1050B 2 GHz to 50 GHz
Microwave Power Amplifier
Operation Manual, Part Number 35575, Rev. A, January 2014
Page 2
price change
privileges are reserved by Giga-tronics.
All technical data and specifications in this publication are subject to change without prior notice and do not represent a commitment on the part of Giga-tronics, Incorporated.
© 2013 Giga-tronics Incorporated. All rights reserved. Printed in the U.S.A.
Giga-tronics GT-1050B Microwave Power Amplifiers are warranted against defective materials and workmanship for one year from date of shipment. Giga-tronics will at its option repair or replace products that are proven defective during the warranty period. This warranty DOES NOT cover damage resulting from improper use, nor workmanship other than Giga-tronics service. There is no implied warranty of fitness for a particular purpose, nor is Giga-tronics liable for any consequential damages. Specification and
Warranty
CONTACT INFORMATION
Giga-tronics, Incorporated
4650 Norris Canyon Road
San Ramon, California 94583
Telephone: 800.726.4442 (only within the United States)
925.328.4650
Fax: 925.328.4700
On the Internet: www.gigatronics.com
Page 3
Giga-tronics GT-1050B Microwave Power Amplifier
Regulatory Compliance Information
This product complies with the essential requirements of the following applicable European Directives, and carries the CE mark accordingly.
89/336/EEC and 73/23/EEC EMC Directive and Low Voltage Directive EN61010-1 (1993) Electrical Safety EN61326-1 (1997) EMC – Emissions and Immunity
Manufacturer’s Name: Manufacturer’s Address
Giga-tronics, Incorporated 4650 Norris Canyon Road San Ramon, California 94583 U.S.A.
Type of Equipment: Model Series Number
Microwave Power Amplifier GT-1050B
Model Numbers:
Not applicable
Declaration of Conformity on file. Contact Giga-tronics at the following;
Giga-tronics, Incorporated
4650 Norris Canyon Road
San Ramon, California 94583
Telephone: 800.726.4442 (only within the United States)
925.328.4650
Fax: 925.328.4700
Operation Manual, Part Number 35575, Rev. A, January 2014
Page 4
Number
Date
Record of Changes to This Manual
Use the table below to maintain a permanent record of changes to this document. Replacement pages will be issued as a TPCI (Technical Publication Change Instruction).
TPCI
TPCI Issue
Date Entered Comments
Page 5
Giga-tronics GT-1050B Microwave Power Amplifier
Table of Contents
CHAPTER 1 SAFETY AND MANUAL CONVENTIONS ...................................................................................................1
1.1 Personal Safety Alert ........................................................................................................................................1
1.2 Equipment Safety Alert .....................................................................................................................................1
1.3 Notes .................................................................................................................................................................1
1.4 Electrical Safety Precautions ............................................................................................................................2
1.5 Important Operating Instructions ....................................................................................................................2
C
HAPTER 2 INTRODUCTION ...............................................................................................................................3
2.1 Overview ...........................................................................................................................................................3
2.1.1 Features and Benefits of the GT-1050B Microwave Power Amplifier ......................................................3
2.2 Controls, Indicators, and Connectors ...............................................................................................................4
2.3 Receiving and Inspection ..................................................................................................................................6
2.4 Prepare the GT-1050B for Use ..........................................................................................................................7
2.4.1 Cooling .......................................................................................................................................................7
2.4.2 AC Power Requirements ...........................................................................................................................7
2.5 Shipping, Repair, and Calibration .....................................................................................................................7
2.5.1 Shipping the GT-1050B ..............................................................................................................................7
2.5.2 Repairs .......................................................................................................................................................8
2.5.3 Calibration .................................................................................................................................................8
C
HAPTER 3 OPERATION ...................................................................................................................................9
3.1 Operating Safety and Instructions ....................................................................................................................9
HAPTER 4 PERFORMANCE VERIFICATION .......................................................................................................... 10
C
4.1 Specifications ................................................................................................................................................. 10
4.2 Performance Verification .............................................................................................................................. 15
4.2.1 Equipment and Material ........................................................................................................................ 15
Operation Manual, Part Number 34817, Rev. D, July 2013
Page 6
List of Figures
Figure 1: GT-1050B Front Panel..................................................................................................................................4
Figure 2: GT-1050B Rear Panel ...................................................................................................................................4
Figure 3: S21 (typical) .............................................................................................................................................. 13
Figure 4: Group Delay (typical) ................................................................................................................................ 13
Figure 5: S11, S22 (typical) ...................................................................................................................................... 14
Figure 6: Saturated Output Power (typical) ............................................................................................................ 14
Figure 7: GT-1050B Performance Verification Setup .............................................................................................. 15
List of Tables
Table 1: GT-1050B Front Panel Controls, Indicators, and Connections .....................................................................5
Table 2: GT-1050B Rear Panel Controls, Indicators, and Connections .......................................................................5
Table 3: Receiving and Inspection of the GT-1050B ...................................................................................................6
Table 4: Operate the GT-1050B ..................................................................................................................................9
Table 5: Frequency Range ....................................................................................................................................... 10
Table 6: Output Power ............................................................................................................................................ 10
Table 7: Gain Flatness .............................................................................................................................................. 11
Table 8: Input and Output VSWR ............................................................................................................................ 11
Table 9: Additional Specifications ........................................................................................................................... 11
Table 10: General Specifications ............................................................................................................................. 12
Table 11: Supplemental Data .................................................................................................................................. 12
Table 12: GT-1050B Performance Verification Procedure ...................................................................................... 16
Table 13: Performance Verification Measurements ............................................................................................... 17
Operation Manual, Part Number 34817, Rev. D, July 2013
Page 7
WARNING
CAUTION

Chapter 1 Safety and Manual Conventions

This manual contains conventions regarding safety and equipment usage as described below.

1.1 Personal Safety Alert

WARNING: Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

1.2 Equipment Safety Alert

CAUTION: Indicates a situation which can damage or adversely affect the GT-1050B or associated equipment.

1.3 Notes

Notes are denoted and used as follows:
NOTE: Highlights or amplifies an essential operating or maintenance procedure, practice, condition or statement.
Review this manual to become familiar with the instrument safety markings and instructions before operation.
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Safety and Manual Conventions Giga-tronics GT-1050B Microwave Power Amplifiers

1.4 Electrical Safety Precautions

• Any servicing instructions are for use by service-trained personnel only. To avoid personal injury, do not
perform any service unless you are qualified to do so.
• For continued protection against fire hazard, replace the AC line fuse only with a fuse of the same current
rating and type. Do not use repaired fuses or short circuited fuse holders.

1.5 Important Operating Instructions

• The GT-1050B Amplifier does not include an enable/disable feature to activate and deactivate the amplifier.
When connecting or disconnecting the output of the amplifier, ensure that the power switch on the rear of the amplifier is in the OFF position.
• When connecting the amplifier to a transmitting device, observe all safety procedures to ensure that the
amplifier isn’t interfering with other systems in the area. High power microwaves can adversely affect power sensitive instruments in the area of transmission.
• Exercise precautions to avoid exposure to radiated microwave energy at all times.
2 Operation Manual, Part Number 34817, Rev. D, July 2013
Page 9
Giga-tronics GT-1050B Microwave Power Amplifier Introduction

Chapter 2 Introduction

2.1 Overview

The Giga-tronics GT-1050B Microwave Power Amplifiers are high-performance solid-state microwave power amplifiers. The Giga-tronics GT-1050B provide excellent pulse fidelity, low intermodulation distortion, high linearity and superior gain flatness without the warm-up time, drift or aging issues of traveling wave tube amplifiers (TWTA). They feature low noise figure, low harmonics and spurious content, and are highly tolerant to load mismatch.
GT-1050B:
• Frequency Range: 2 GHz to 50 GHz.
• 2.4 mm compatible 1.85 mm (f) V input connector.
• 2.4 mm compatible 1.85 mm (f) V output connector.

2.1.1 Features and Benefits of the GT-1050B Microwave Power Amplifier

• 25 dB nominal gain over the 2 GHz to 50 GHz frequency range.
• Ideal for testing in R&D labs, ATE systems, wireless communications applications and defense EW
systems.
• Small size allows easily placing the amplifier close to the device under test.
Page 10
Introduction Giga-tronics GT-1050B Microwave Power Amplifier

2.2 Controls, Indicators, and Connectors

The following pages describe all of the features shown in Figure 1 and Figure 2.
Figure 1: GT-1050B Front Panel
Figure 2: GT-1050B Rear Panel
4 Operation Manual, Part Number 34817, Rev. D, July 2013
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Giga-tronics GT-1050B Microwave Power Amplifier Introduction
The tables below describe the functions of the features shown in Figure 1 and Figure 2 on the previous page.
Table 1: GT-1050B Front Panel Controls, Indicators, and Connections
GT-1050B Front Panel Controls, Indicators, and Connections
Name Function
Power on LED
• Extinguished when DC power is not applied
• Illuminated blue when DC power is applied
OUTPUT
(RF output connector)
2.4 mm compatible 1.85 mm (f) V connector.
Table 2: GT-1050B Rear Panel Controls, Indicators, and Connections
GT-1050B Rear Panel Controls, Indicators, and Connections
Name Function
Power Switch Switches the unit on and off.
Fuse Field replaceable fuse.
Power Input AC power input.
INPUT
(RF input connector)
Fan Cooling fan for unit.
2.4 mm compatible 1.85 mm (f) V connector.
Page 12
Introduction Giga-tronics GT-1050B Microwave Power Amplifier

2.3 Receiving and Inspection

Follow the procedure in Table 3 for receiving and inspecting the GT-1050B.
Table 3: Receiving and Inspection of the GT-1050B
Receiving and Inspection of the GT-1050B
Step Action
1.
2.
Before opening the shipping container, inspect it for any signs of damage.
If THERE IS evidence of damage; record the location and extent of the damage and contact the shipper immediately to report the damage.
If there is NO EVIDENCE of damage; continue to the next step.
Open the shipping container and inspect the contents for evidence of damage. The contents should include the following:
• GT-1050B Microwave Power Amplifier
• AC line cord
If any of the contents are damaged or missing, contact Giga-tronics immediately. Refer to the Contact Information on the inside of the front cover of this manual.
End of procedure
6 Operation Manual, Part Number 34817, Rev. D, July 2013
Page 13
Giga-tronics GT-1050B Microwave Power Amplifier Introduction

2.4 Prepare the GT-1050B for Use

2.4.1 Cooling

The GT-1050B has an internal cooling fan. The air intake is located on the rear panel of the instrument. When using the GT-1050B, ensure there are no obstructions to the flow of air into or out of the instrument.

2.4.2 AC Power Requirements

AC Power Requirements: See Table 10 on page 12

2.5 Shipping, Repair, and Calibration

2.5.1 Shipping the GT-1050B

If it is necessary to ship the GT-1050B, observe the following:
• Use the best packaging materials available. If possible, reuse the original shipping container.
• If the original shipping container is not available, use a strong carton (350 lbs./sq. in. bursting strength) or a
wooden box.
• Wrap the amplifier in heavy paper or plastic before placing it into the shipping container.
• Completely fill the areas on all sides of the amplifier with packaging material. Take extra precaution to
protect the front and rear panels.
• Seal the package with strong tape or metal bands. Mark the outside of the package clearly, and in bold type,
as follows:
FRAGILE — DELICATE INSTRUMENT
Page 14
Introduction Giga-tronics GT-1050B Microwave Power Amplifier

2.5.2 Repairs

The Giga-tronics GT-1050B Microwave Power Amplifier is a robust instrument that has been designed and built for years of trouble-free service. However, if you experience problems with the instrument, do the following:
1. Contact your local Giga-tronics sales office, or the factory, and be prepared to provide the model, serial
number, and any included options of your amplifier, and a description of the problem. To contact the factory directly, use the following information:
Contacting Giga-tronics Customer Service
Email repairs@gigatronics.com
Telephone (within the United States) 800.726.4442
Telephone 925.328.4702
Fax 925.328.4702
2. If it is has been determined that you must ship the GT-1050B to the factory or a service center for repair,
you will be issued a Return Materials Authorization (RMA) number. Use the RMA number in all correspondence regarding the repair.
3. Pack the GT-1050B for shipment as described in the previous section, and enclose all relevant
information regarding the problem.
4. Ship the GT-1050B to the address provided by Giga-tronics Customer Service.

2.5.3 Calibration

The GT-1050B Microwave Power Amplifier does not require calibration. There are no adjustments. For more information, contact Giga-tronics.
8 Operation Manual, Part Number 34817, Rev. D, July 2013
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equipment is energized.
WARNING

Chapter 3 Operation

3.1 Operating Safety and Instructions

DO NOT EXCEED AN INPUT LEVEL OF +20 dBm INTO THE GT-1050B. EXCEEDING
CAUTION
WHEN ENERGIZED, THE GT-1050B IS CAPABLE OF SUPPLYING POWER THAT
THIS LEVEL CAN DAMAGE THE GT-1050B MICROWAVE POWER AMPLIFIER.
CAN CAUSE DAMAGE OR INJURY. TAKE THE FOLLOWING PRECAUTIONS TO ENSURE SAFE SETUP AND OPERATION:
• Verify that all cables, connectors, and equipment connected to the
GT-1050B are in good condition.
• Do not make connections to equipment while the output of any item of
Table 4: Operate the GT-1050B
Operate the GT-1050B
Step Action
1.
2.
3.
4.
5.
• Verify that the POWER switch on the rear of the unit is OFF.
• Connect a source of AC power that meets the specifications for power in Table 10 on page
12.
• Put the POWER switch on the GT-1050B in the ON position.
NOTE: For best results, let the GT-1050B warm up for one minute after switching the AC power ON.
Verify that the output of the microwave signal source is NOT energized before continuing to the next step.
Connect the equipment to the GT-1050B according to your application.
NOTE: Verify all mating connectors are 50 Ohm, and that they are in good condition.
Energize the output of the microwave signal source.
Adjust the output of the microwave signal source until the output from the GT-1050B is at the desired level.
End of Procedure
Page 16

Chapter 4 Performance Verification

This chapter is divided into two sections:
• Specifications: this section contains all of the operating specifications that define the performance of
the GT-1050B.
• Performance Verification: this section contains the test procedure that ensures that the
GT-1050B meets the specifications.

4.1 Specifications

NOTE: Graphs of some of the GT-1050B characteristics are on page 13 and page 14.
Table 5: Frequency Range
Frequency Range
Model Specification
GT-1050B
GT-1051B
Table 6: Output Power
2 GHz to 50 GHz
10 MHz to 50 GHz
Output Power
Parameter Specification
2 to 10 GHz +30 dBm (1 Watt) typical, +26 dBm (400 mW) minimum
10 to 30 GHz +28 dBm (600 mW) typical, +25 dBm (300 mW) minimum
30 to 40 GHz +27 dBm (500 mW) typical, +23 dBm (200 mW) minimum
40 to 50 GHz +24 dBm (250 mW) typical, +20 dBm (100 mW) minimum
NOTES:
• Output power is specified as minimum saturated power into 50 Ohm load with +5 dBm input,
at 23 °C ± 5 °C.
• Input power for normal operation should be limited to +20 dBm maximum.
10 Operation Manual, Part Number 34817, Rev. D, July 2013
Page 17
Table 7: Gain Flatness
Gain Flatness
Range Specifications
2 to 40 GHz ± 5 dB maximum, ± 2.5 dB typical
2 to 50 GHz ± 7 dB maximum, ± 3.5 dB typical
NOTES:
• Nominal gain is 25 dB.
• Gain flatness is specified as maximum variation with -5 dBm input and 50 Ohm load.
Table 8: Input and Output VSWR
Input and Output VSWR
Connector
Frequency Range
2 to 30 GHz 30 to 40 GHz 40 to 50 GHz
Input, 50 ohms 1.5:1 typical 2.0:1 typical 2.3:1 typical
Output, 50 ohms 2.0:1 typical 2.3:1 typical 2.9:1 typical
Table 9: Additional Specifications
Additional Specifications
Parameter Specification
Stability Unconditionally Stable
Maximum Load VSWR 3:1
Harmonic Distortion* < -30 dBc typical
Spurious* < -60 dBc typical
Noise Figure < 10 dB typical, < 14 dB maximum
* Harmonics measured at +10 dBm output power. Spurious measured at -5 dBm input power level
Operation Manual, Part Number 34817, Rev. D, July 2013 11
Page 18
Table 10: General Specifications
General Specifications
Parameter Specification
Operating Temperature 0 °C to +50 °C
Storage Temperature -20 °C to +75 °C
Cooling Forced air
Dimensions 2.5 inches H x 6.8 inches D x 7.0 inches W
(64 mm H x 173 mm D x 178 mm W)
Weight 4.5 lbs (2 kg)
RF Connectors 2.4 mm compatible 1.85 mm (f) V
AC line input 100 to 240 VAC, 50 to 60 Hz, Single Phase
Fuse 250V, Type T, Slow-Blow, 0.25 Amp
Table 11: Supplemental Data
Supplemental Data
Parameter Specification
Maximum input power (RF)
DC power dissipation 20 VA maximum
Connector adapters
Connector compatibility
+20 dBm
2.92 mm (f) to 2.4 mm (m) adapter available (Consult Factory)
SMA, 3.5 mm and 2.92 mm are NOT compatible with 2.4 or 1.85 mm connectors!
An adapter is required.
12 Operation Manual, Part Number 34817, Rev. D, July 2013
Page 19
Figure 3: S21 (typical)
Figure 4: Group Delay (typical)
Operation Manual, Part Number 34817, Rev. D, July 2013 13
Page 20
Figure 5: S11, S22 (typical)
Figure 6: Saturated Output Power (typical)
14 Operation Manual, Part Number 34817, Rev. D, July 2013
Page 21

4.2 Performance Verification

This section describes how to test the GT-1050B to verify that it meets Giga-tronics specifications.
The overall operation of the GT-1050B Microwave Power Amplifier is checked using a broadband signal source, power sensor, and a power meter.
The test setup is shown in Figure . The procedure is shown in Table 12 and starts on page 16.

4.2.1 Equipment and Material

• Signal source: Giga-tronics 2550B 50 GHz Microwave Signal Generator or equivalent
• Power meter: Giga-tronics 8651B or 8652B Power Meter or equivalent
• Power sensor: Giga-tronics 81305A, 50 GHz, 2.4 mm or equivalent
• Attenuator pad: 10 dB, 50 GHz, 2.4 mm Attenuator Pad
• Test cable: 2.4 mm (m), 50 GHz test cable
Figure 7: GT-1050B Performance Verification Setup
Note: Connect test cable between 2550B RF Output and GT-1050B DUT RF Input. Connect the 10 dB attenuator pad directly to the GT-1050B DUT RF Output and the 81305A 50 GHz Power Sensor following the 10 dB attenuator pad.
Operation Manual, Part Number 34817, Rev. D, July 2013 15
Page 22
Table 12: GT-1050B Performance Verification Procedure
GT-1050B Performance Verification Procedure
Step Action
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Connect equipment as shown in Figure .
Keep equipment powered off until all connections are made.
Always start with signal generator RF Off.
Turn equipment on (with RF Off) and allow to warm up for 30 minutes.
Set signal generator to the first test frequency and RF power level at -20 dBm.
Set power meter to first test frequency.
Set 10 dB Offset on power meter to compensate for 10 dB attenuator pad.
Turn on signal generator RF output and increase RF power level to +5 dBm.
Measure power output from DUT on power meter and record the value.
Set signal generator to the next test frequency
Set power meter to next test frequency.
Measure power output from DUT on power meter and record the value.
Repeat steps 10 thru 12 for all remaining test frequencies.
Verify measured power exceeds minimum power specification.
End of Procedure
16 Operation Manual, Part Number 34817, Rev. D, July 2013
Page 23
Table 13: Performance Verification Measurements
Frequency
(GHz)
Minimum Power
Output (dBm)
Measured Power
Output (dBm)
Frequency
(GHz)
Min. Power
Output (dBm)
26 25
2 26 27 25
3 26 28 25
4 26 29 25
5 26 30 23
6 26 31 23
7 26 32 23
8 26 33 23
9 26 34 23
10 25 35 23
11 25 36 23
12 25 37 23
13 25 38 23
14 25 39 23
15 25 40 20
Measured Power
Output (dBm)
16 25 41 20
17 25 42 20
18 25 43 20
19 25 44 20
20 25 45 20
21 25 46 20
22 25 47 20
23 25 48 20
24 25 49 20
25 25 50 20
Serial Number
Operation Manual, Part Number 34817, Rev. D, July 2013 17
Page 24
Last page of Document
18 Operation Manual, Part Number 34817, Rev. D, July 2013
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