EMC TWT8G-200 Manual

TWT8G-200
MODEL NUMBER:
OPERATING AND MAINTENANCE
INSTRUCTIONS
CW TWT HIGH POWER
WIDE BAND AMPLIFIER
THE EMC SHOP, 7401 GALILEE RD. #160 ROSEVILLE, CA 95678
844.423.7435[email protected]WWW.THEEMCSHOP.COM
SERIAL NUMBER:
1904037401
TWT8G-200 MANUAL
MAN-70007, REVISION B, 02-20-2017

MAN-70007, Rev B, 02-20-2016
Page 2of 31
PowerMax Innovation Inc.
1243 Reamwood Ave.,
Sunnyvale, CA 94089
Tel.: [phone]; Fax. [phone]
TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
1.0 INTRODUCTION ........... ..............................................................................................................3
2.0 GENERAL DESCRIPTION............................................................................................................5
3.0 TWTA Controller Operation…………. ..........................................................................................6
4.0 GENERAL INFORMATION
4.1 Scope of This Manual .....................................................................................................14
4.2 Operation Overview ........................................................................................................14
4.3 N/A
4.4 General Specifications.....................................................................................................15
4.5 Functional Description ....................................................................................................15
4.6 Protection Circuits ..........................................................................................................16
4.7 Status Indicators, Controls and Connectors .....................................................................17
4.8 Data Sheets…….. ...........................................................................................................20
5.0 PRINCIPALS OF OPERATION
5.1 Proper Usage and Warnings............................................................................................21
6.0 REMOTE INTERFACE FOR MEDIUM POWER AMPLIFIERS
6.1 Introduction ....... ............................................................................................................22
6.2 RS-232 Interface.. ...........................................................................................................22
6.3 ETHERNET Interface.....................................................................................................23
6.4 Remote Command Format ..............................................................................................24
6.5 Remote Command ..........................................................................................................25
6.6 Remote Example Code....................................................................................................28
7.0 MAINTENANCE AND SERVICING
7.1 Periodic Maintenance......................................................................................................29
7.2 Servicing the Amplifier...................................................................................................29
7.3 Equipment Return Procedure ..........................................................................................30
8.0 WARRANTY INFORMATION....................................................................................................31
LIST OF FIGURES
FIGURE DESCRIPTION PAGE
1.0 OUTLINE DRAWING ..............................................................................................................4
2.0-9.0 CONTROL DISPLAY .........................................................................................................6-13
10.0 SYSTEM BLOCK DIAGRAM .......................................................................................14
11.0 REAR PANEL ILLUSTRATION....................................................................................18
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MAN-70007, Rev B, 02-20-2016
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SECTION 1.0
INTRODUCTION
Congratulations on the purchase of your new Wide Band Amplifier from PowerMax Innovation, Inc.
Your new Wide Band Amplifier incorporates the finest advancements in the state of the art electronics
technology available in a compact, portable and versatile package. Your Wide Band Amplifier's quality,
performance and trouble free operation depends on you thoroughly reading through this manual and
familiarizing yourself with its proper operation and usage.
Your Wide Band Amplifier comes with the following accessories, be sure to check your packaging for
the items listed below before disposing of the packaging.
CONTENTS
(For a typical Wide Band Amplifier)
Quantity Description
1
1
1
1
CW TWT High Power Wide Band Amplifier, Model TWT8G-200
Mating Connector, Power Line
Operation andInstruction Manual
Data Sheets (Included in Manual)
!!ATTENTION!!
MUST Turn ON Amplifier for 4 hours
every 30-60 days in RF-ON mode
preferably with low-level RF drive to
prevent TWT gassing up.
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FIGURE 1.0
OUTLINE DRAWING
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SECTION 2.0
GENERAL DESCRIPTION
© The EMC Shop, LLC manufactured CW TWT Wide Band Amplifier is a Bench Top or rack mount
amplifier providing a nominal 200 Watts CW of RF power from 2 to 8 GHz, with output power of at
least 200 Watts CW. The minimum saturated output power at midband of the operating frequency
range is more than 200 Watts CW.
The Amplifier features atouch screen 7”, high resolution [800x480] color TFT Display that displays
continuous forward andreflectedpower metering. The display also provides the operator with operating
status andself diagnostic fault indications.
The Amplifier incorporates protection circuits that monitors and controls so the amplifier cannot be
damagedby any mismatched load.
The Amplifier has an Ethernet interface which allows the amplifier to be remotely controlledthrough the
use of a computer.
To operate the Amplifier, connect a three phase power line (220 Vac line to line) 5 wires to the Power
line MS connector on the rear panel as shown below.
For 220Vac single phase connect Line to pin A, Neutral to pin B and ground to pin E.
Three Phase Connection.
PIN A –PHASE A
PIN B –PHASE B
PIN C –PHASE C
PIN D –NEUTRAL
PIN E –GROUND
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SECTION 3.0
TWTA Controller Operation
3.1 Hardware Initialization
The local mode of operation will allow the user to exercise control over the parameters by way of
button switches located toward the right of the screen. Pressing a button switch will toggle the
switch position and will highlight its function.
FIGURE 2.0- Hardware Initialization Screen
Once the power is turned on the controller will boot and display the boot screen as shown
above. It will only be displayed for a few seconds follows by the The EMC Shop Logo screen.
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3.2 The EMC Shop Screen
FIGURE 3.0 - The EMC Shop Logo Screen
The The EMC Shop logo screen it is only displayed for a few seconds and is shown in
above.
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3.3 Information Screen
FIGURE 4.0 - System Information and Set Time Button Screen
The Information screen displayed is the set time, Model and version description screen, it will be
displayed for a few seconds, should the set time icon be touched the adjust time and date screen
will be shown as in Fig. 5.
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3.4 Time & Date setup menu
FIGURE 5.0 - Set Time and Date Screen
Figure 5 shows the buttons for adjusting the time and date. Touch the + or –Buttons to adjust the
time and date, then save, then exit to return to the main screen.
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3.5 Operate Menu, RF-OFF
FIGURE 6.0 - OPERATE MENU
The operating menu will come up in POWER_OFF-Mode. The values for Forward Power
(FWD), Reflected Power (RFL), and metering should be zero. The Gain will be at 100% at all
times unless the Attenuator is being controlled by pressing the Gain buttons Up or Down [only
with Attenuator Option].
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3.6 TURNING-ON THE AMPLIFIER
FIGURE 7.0 –TURNING ON THE AMPLIFIER
1. Touch the POWER OFF Button which will change to POWER ON. The unit will display
“HEATER Time left” and start the countdown starting with the required time for the
applicable TWT incorporated in the amplifier. In this mode the Heater supply will be
energized.
2. After the time out, the amplifier will revert to STANDBY mode
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3.6.1 Standby Mode
FIGURE 8.0 –STANDBY MODE (Typical)
At this mode the TWT is fully warmed up, all High Voltages are OFF and only are being applied
when the amplifier goes to RF-ON mode [also known as Cathode turned on].
Some TWTs have a single Collector element, therefore only COLL1V will be display.
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3.6.2 RF-ON Mode
FIGURE 9.0 –RF-ON MODE
1. Place the unit in RF ON mode. In this mode the TWT will be turned ON.
2. The display will show the Helix and Collector currents as per TWT operating data sheet
(enclosed in the manual).
3. Grid voltage will be displayed only with TWTs having Grid element.
4. Some TWTs have a single Collector element, therefore only COLL1V will be display.
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SECTION 4.0
GENERAL INFORMATION
4.1 SCOPE OF THIS MANUAL
This manual is intended to inform a qualified transmitter operator or technician of the normal operating
and maintenance procedures for the TWT Amplifier. It is not intended to be a course of instruction for
unqualified personnel.
4.2 OPERATION OVERVIEW
The Amplifier is designed to amplify a low level microwave signal and supply a high power CW output.
The Amplifier system function is accomplished primarily through the use of a Traveling Wave Tube
(TWT),control circuitry and HV power supplies, which can be controlled either locally or remotely. The
major subassemblies are mounted on separated decks. The left deck houses the HV Power supply &
control circuitry. The right deck houses the TWT and all the RF components.
FIGURE 10.0 - SYSTEM BLOCK DIAGRAM
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4.4 GENERAL SPECIFICATIONS
The specifications listed below represent the minimum performance characteristics at the time of delivery.
SPECIFICATIONS
Frequency
2-8GHz
Output Power
200W CW min.
250W CW Typical in midband
Input Drive
≤ 0dBm
Gain @ Rated power
54.0 dB
Input Impedance
50 Ohms nominal
Output Impedance
50 Ohms nominal
Spurious
-50dBc max.
Harmonics
2-3GHz: 0 to -4dBc;
3-6GHz: -4 to -8dBc;
6-8GHz: -8 to -15dBc
Noise Factor
35dBm
Prime Power
220Vac, 50/60Hz, 3 Phase, 5 wires
Power Consumption
3KVA max.
4.5 Functional Description
The required voltages and currents to operate the TWT are provided by the Helix, Collector and Heater
supplies. The Helix supply provides the negative high voltage potential between TWT Cathode and
ground. The Collector supply provides the high voltage potential between the TWT Cathode and
Collector. The Heater supply provides the Heater voltage and floats at high voltage Cathode potential.
The primary control circuitry and the service power supplies (+5V, +/- 12V, + 48V [Fans]) are energize
when the main circuit breaker is turned ON. Upon pressing the AMP ON switch, the Heater & Bias
supplies are energize and a three minutes warm up time is initiated. At the completion of the three
minutes time out the HV supplies applied to the TWT then the Amplifier goes to STBY mode if no faults
were detected . Upon pressing the RF ON switch the Grid voltage is applied to the TWT Grid with
Positive voltage which turns the Beam ON.
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4.6 PROTECTION CIRCUITS
The TWT Amplifier is designed with a variety of protection circuits to provide safeguards for the
amplifier should any adverse electrical conditions occur or if the amplifier is accidentally experiencing
operator deviation of the design application. Listed below are the safeguards.
4.6.1 Over Heat Protection
The TWT a critical component of this Amplifier is mounted to a heat sink which in turn, air cooled by
high efficiency blower. Should an overheating condition occur, either through component failure or by a
restricted air flow, the Amplifier contains heat sensors that will shut down the system should an
overheating condition occur. As a result, the air inlet and outlet openings should be free of obstructions
for proper cooling of the amplifier. Operation is restored by the Reset button when the amplifier cools to
normal temperature levels.
4.6.2 Power Supply Faults
The Power Supply Fault circuit monitors the Helix and Collectors power supplies and produces a fault
indication should any voltage level deviate from normal operating parameters. Each power supply
voltage output is monitored and displayed. Should any power supply voltage deviate from the design
parameters, the Fault Indication on the front panel Display of the Amplifier will display the related fault.
4.6.3 Mismatch Protection
The Amplifier is designed to operate with a tuned 50 Ohm load and should any mismatching of the 50
Ohm occur, the Reverse Power, also called Reflective Power, will increase producing a high VSWR. The
Amplifier microprocessor monitors the Reverse Power levels by utilizing a Dual Directional Coupler.
When the Reflected Power exceeds 25% the Amplifier Output Power it will go to STBY and the High
VSWR message will be indicate on the LCD display. The Reverse Power is also displayed on the LCD
Display for operator monitoring for any mismatched load.
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4.7 STATUS INDICATORS, CONTROLS AND CONNECTORS
The Amplifier has various controls and status indicators which are identified below and can be visually
located on Figure 1.0, Illustration and Figure 3.0, Rear Panel Illustration. A narrative description for
the function and purpose of each control and status indicator is provided within paragraphs 4.7.1 and
4.7.2.
RF AMPLIFIER
Front Panel
Rear Panel
Power ON/OFF Ckt Bkr
AC PWR MS Power Connector
Local/Remote Touch switch
RJ45 Ethernet Connector
POWER ON/OFF Touch switch
RS232 Connector
RF ON/OFF Touch switch
RF Input N, Female
Fault/Reset Touch switch
RF Output type 7/16, Female
FWD Sample Port N, Female
TFT Status Display
RFL Sample Port N, Female [Optional]
Connector Type
Location
Comments/Notes
Input Connector
N/Female
Rear
Output Connector
7/16-Female
Rear
FWD Sample Port
N/Female
Rear
-50dBc ±1dB
RFL Sample Port
N/Female
Rear
-50dBc ±1dB [optional]
Remote
RS232, RJ-45
Rear
RS232, Ethernet
AC Connector
MS3102E18-11P
Rear
220Vac, 3 Phase, 5wires, 3KVA max.
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FIGURE 11.0 - REAR PANEL ILLUSTRATION
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4.7.1 FRONT PANEL STATUS INDICATORS
INDICATOR FUNCTION
Fault The Fault will be indicated when the any of the Power Supplies deviate
from the design parameters. The Amplifier will revert to RF OFF mode
when either a Thermal condition occurs outside design parameters. Should
an excessive temperature condition occur while monitoring the TWT
temperature of the Heat sink temperature the Amplifier will revert to RF
OFF mode. The TFT Display will indicate which fault had occurred.
Heater/RFON Hours Elapsed time Indication on the TFT display, presents Heater hours of
the amplifier or RF-ON hours with BEAM ON.
Remote The Remote will be indicated when the amplifier is in the remote control
mode of operation via the computer.
4.7.2 CONTROLS
CONTROL FUNCTION
AC Power Breaker Circuit Breaker to turn On/Off main prime power to the Amplifier.
Local The Local switch is a touch switch. When
depressed, the amplifier is restored to the local control from the
Remote mode of control.
POWER OFF / ON Switch, when set to POWER ON mode it will apply Heater Voltage to the
TWT and after the warm-up time will apply the high voltages required to
operate the tube , when set to POWER OFF it turn all supplies OFF.
RF OFF /RF ON Switch, when set to RF ON mode it will apply the Positive voltage to the
TWT-Grid via the Modulator to turn Beam ON, when set to RF OFF it
turns TWT Beam OFF.
RESET Switch, when pressed resets Faults.
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4.8 DATA SHEETS
Provided with each Amplifier are specific Test Data Sheets measured from the amplifier using a calibrated
50 Ohm Pad to assist the operator in maximizing the performance of the Wide Band Amplifier.
The accuracy of the Metering is ± 1 dB (nominal) so to provide the operator with the ability to maximize
the performance of the wide band amplifier.
The Test Data Sheets are located within Appendix A
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