CPI VZU-6994 User manual

Compact
Provides up to 400 watts of power in a 3 rack
unit package, digital ready, for wideband, single-
and multi-carrier satellite service in the Ku-Band
frequency range. Ideal for transportable and fixed
earth station applications where space and prime
power are at a premium.
Efficient
Employs a high efficiency dual-depressed
collector helix traveling wave tube backed by
many years of field-proven experience in airborne
and military applications.
Simple to Operate
User-friendly microprocessor-controlled
logic with integrated computer interface.
Digital metering, pin diode attenuation and
optional integrated linearizer for improved
intermodulation performance.
Global Applications
Meets International Safety Standard EN-60215,
Electromagnetic Compatibility 89/336/EEC and
Harmonic Standard EN-61000-3-2 to satisfy
worldwide requirements.
Easy to Maintain
Modular design and built-in fault diagnostic
capability with convenient and clearly visible
indicators behind front panel door for easy
maintainability in the field.
Worldwide Support
Backed by over three decades of satellite
communications experience, and CPI’s worldwide
24-hour customer support network that includes
fifteen regional factory service centers.
350W/400W Compact Medium Power Amplifier
350/400W Compact Medium Power Amplifier
for Satellite Communications
The VZU-6994
Up to 400 Watt
TWT Medium
Power Amplifier
— high efficiency in a
compact package.
Ku-Band
811 Hansen Way
P.O. Box 51625, Palo Alto, CA 94303
tel: [phone]
fax: [phone]
e-mail: [email protected]
www.cpii.com/satcom
Ku-Band

SPECIFICATIONS, VZU-6994
Electrical
Frequency 13.75 to 14.50 GHz, 12.75 to 14.50 GHz,
or 14.7 to 15.2 GHz
Output Power
TWT 350W min. (55.44 dBm), all configurations;
400W min. (56.02 dBm), 13.75 to 14.5 GHz
Flange 275W min. (54.39 dBm), all configurations;
340W min. (55.31 dBm), 13.75 to 14.5 GHz
Bandwidth 500 to 1750 MHz, depending on configuration
Gain 73 dB min. at rated power output;
78 dB min. at small signal
RF Level Adjust Range 0 to 20 dB
Gain Stability ±0.25 dB/24hr max.
(at constant drive and temp.)
Small Signal Gain Slope ±0.015 dB/MHz max., 13.75 - 14.5 GHz
±0.02 dB/MHz max., all other configurations
Small Signal Gain Variation 1.0 dB pk-pk across any 80 MHz band;
2.5 dB pk-pk across the entire passband
Input VSWR 1.3:1 max.
Output VSWR 1.3:1 max.
Load VSWR 2.0:1 max. operational; any value for operation
without damage
Residual AM -50 dBc below 10 kHz
-20[1.3 +log F(kHz)] dBc, 10 kHz to 500 kHz
-85 dBc above 500 kHz
Phase Noise
IESS Phase Noise Profile -6 dBc
AC Fundamental -42 dBc
Sum of All Spurs -47 dBc
AM/PM Conversion 2°/dB max. for a single carrier at
8 dB below rated power for 350W 13.75
to 14.5 GHz; 2.5°/dB max. at 8 dB below
rated power for all other configurations
Harmonic Output -60 dBc at rated power, second and third
harmonics
Noise Density <-150 dBW/4 kHz in Receive/Reject Band
<-65 dBW/4 kHz in Passband
<-60 dBW/4 kHz in Passband w/linearizer
Intermodulation -24 dBc max. with two equal carriers
at total output power 7 dB (4 dB with
optional integral linearizer) below rated
single-carrier output; -22 dBc max. at 7 dB
OBO (4 dB w/lin.) for 14.7 - 15.2 GHz config.
Group Delay 0.01 ns/MHz linear max.
(in any 80 MHz band) 0.001 ns/MHz2parabolic max.
0.5 ns pk-pk ripple max.
Environmental (Operating)
Primary Power 110 - 240 VAC ±10%,
single phase 47-63 Hz
(100 VAC optional)
Power Consumption 1.3 kVA typ., 1.4 kVA, max. for
350W configurations;
1.35 kVA typ., 1.5 kVA max. for
400W configuration
Power Factor 0.95 min.
Ambient Temperature -1
0° to +50°C operating
-40° to +70°C non-operating
Relative Humidity 95% non-condensing
Altitude 10,000 ft. with standard adiabatic
derating of 2°C/1000 ft., operating;
40,000 ft., non-operating
Shock and Vibration Designed for normal transportation
environment per Section 514.4
MIL-STD-810E. Designed to
withstand 20G at 11 ms (1/2
sine pulse) in non-operating
configuration.
Acoustic Noise 65 dBA @ 3 ft. from amplifier
Mechanical
Cooling (TWT) Forced air with integral blower
Rear air intake & exhaust
RF Input Connection Type N female
RF Output Connection WR 75 waveguide flange,
grooved with UNC 2B 6-32
threaded holes
RF Output Monitor Type N female
Dimensions (W x H x D) 19 x 5.25 x 24 in.
(483 x 133 x 610 mm)
Weight 60 lbs (27.3 kg) max.
OPTIONS:
• Remote Control Panel
• Integral Linearizer
• Redundant and Power
Combined Subsystems
• External Receive Band
Reject Filter (Increases
loss - consult factory
for details)
Ku-Band
For more detailed information, please refer to the corresponding CPI Technical Description.
Note: Specifications may change without notice as a result of additional data or product refinement.
Please contact CPI before using this information for system design.
MKT 15, ISSUE 15 11/06 PDF
Certificate Number: 30515
KEEPING YOU ON THE AIR
not up in the air

811 Hansen Wa
y
Palo Alto, CA 94303 USA
Tel: [phone]
3
Fax: [phone]
Communications & Power Industries
Technical Description
Ku-Band Rack-Mount
Medium Power Amplifier
Model VZU-6994
INTRODUCTION
This document provides a detailed technical description of the Communications & Power
Industries (CPI) VZU-6994 Series MPA, a Ku-band traveling wave tube amplifier
providing up to 400 watts of power and designed specifically for uplink service in
satellite terminals, ‘fly-aways’ and satellite news gathering (SNG) vehicles. This compact
medium power amplifier (CMPA) is 5.25” high, is lightweight and employs a dual
depressed collector helix, permitting continuous, efficient operation across the Ku-band
frequency range. The CMPA also incorporates the use of a microprocessor control
system, thereby simplifying interfacing with remote control and monitor facilities
speeding the integration process. Features include PIN diode attenuation and power factor
correction (0.95 min.) allowing the unit to meet the total harmonic distortion requirement
of EN61000-3-2 and providing for universal voltage input 100-240 VAC. It is also
designed to meet EN60215 safety and 2004/108/EC electromagnetic compatibility
requirements.
The VZU-6994 CMPA is a member of a comprehensive line of communication
amplifiers comprising TWT Amplifiers (TWTAs), High Power Klystron Amplifiers
(KPAs), and Solid State Power Amplifiers (SSPAs). All are designed specifically for
service in satellite earth stations operating in standard frequency bands.
CPI (formerly Varian Electron Device Group) has been active in the design and
manufacture of microwave power amplifiers and related products for more than 30 years.
CPI Satcom Division (formerly Varian MEP) was organized in the mid-1970s to bring
together, under a single business center, the strengths of existing groups involved with
Satcom and Industrial power amplifiers.
Since then, CPI Satcom Division has provided thousands of fully integrated satellite
uplink power amplifiers in the S, C, X, Ku, DBS and Ka- band frequency ranges to
worldwide users and has become the leading supplier of this class of products.
Ku-Band CMPA 04/08 TD-67 Page 1

EQUIPMENT DESCRIPTION
General
The VZU-6994 CMPA (Figure 1) is packaged in a 5.25 inch tall slide-mounted drawer
suitable for standard 19-inch rack mounting. This enclosed assembly houses both the RF
and power supply sections of the amplifier. The RF section includes the TWT, solid state
intermediate power amplifier (IPA), input/output isolation circuits, input attenuator, RF
detectors and output harmonic filter. The power supply section includes the power factor
correction, power processor, and high voltage regulation circuitry. It also contains all
monitor, control and protection circuits necessary to permit safe, efficient and reliable
operation of the CMPA.
The VZU-6994 CMPA is protected from operational damage caused by abnormal AC,
DC, RF faults or insufficient cooling. The amplifier will automatically recycle itself after
a prime power interruption or transient fault condition.
Personnel safety is of utmost importance and is safeguarded by proper grounding and by
access interlocks and shields, which prevent physical entry into the high voltage sections.
The front panel of the unit serves as the primary user interface housing all monitor and
control functions including a type N RF connector to sample and measure output RF
power. Opening the small access door on the front panel allows easy access to
configuration DIP switches that can be set during installation, up/down buttons that
permit setting high and low alarm trip points (such as Low RF), and a set of detail fault
LEDs to help troubleshoot during operation.
Principal functions are also brought to the five user-interface connectors located on the
rear panel for remote monitor and control. Control, fault and monitoring functions are
available via: the RS-422/485 computer interface (CIF) designed to interface directly
with a computer; a second RS-422/485 port to be used when the optional CPI remote
control panel is purchased; a more basic analog command/status port designed for users
who will not be operating remotely via a computer; a separate switching port for use with
switching/power combining subsystems; and a user interlock port for use when
interfacing other equipment or controls with the CMPA.
Digital attenuation is available which allows for RF drive attenuation adjustment via the
serial remote interface ports, thereby enhancing remote monitor and control capabilities.
To expedite field maintenance procedures, the VZU-6994 TWTA utilizes a modular
design approach consisting of Line Replaceable Units (LRUs), which permit service
personnel to maintain the CMPA in the field without need of returning the entire unit to
the depot or factory. Comprehensive built-in-test (BIT) sequences and diagnostic
procedures allow field personnel to localize the fault to the individual LRU, make the
necessary replacement and return the amplifier to service with a minimum of operational
downtime.
Ku-Band CMPA 04/08 TD-67 Page 2

The overall amplifier enclosure measures approximately 19" (w) x 5.25" (h) x 24" (d),
plus air duct adapters, and weighs approximately 60 lbs. The TWT Amplifier can be
installed in a 1:1, 1:2 or 1:3 auto switching, or power combined configuration as needed
by end user mission.
RF Subsystem
A conservative field-proven approach is utilized in the CMPA RF subsystem. The RF
block diagram (Figure 2) identifies all major circuit elements for this technical
description.
A low level RF input signal is applied to the CMPA via a type N connector (isolator)
located at the rear of the enclosure. The isolator limits the input VSWR to a level of 1.3
or less back to the source. The RF input is then routed to the SSIPA which includes an
internal variable attenuator. The attenuator, has a control range of a nominal 20 dB with
quick response and excellent linearity. The IPA is designed to be transparent to final
amplifier RF parameters and is temperature compensated to minimize drift. As a result,
the overall TWT CMPA gain is specified to be stable within ±0.25 dB/24 hours with
±10% line voltage variations. The output of the isolator is then fed to the input of the
TWT. The IPA and TWT provide a combined subsystem gain of at least 73 dB at rated
power.
The primary TWT employed in this power amplifier is a CPI TWT featuring conduction
cooling, dual depressed collectors for efficient operation and a Periodic Permanent
Magnet (PPM) focused helix design. It is designed especially for compact, lightweight
applications involving satellite uplink service.
The output waveguide assembly interfaces to the TWT and protects the tube from
abnormal or transient conditions which could permanently damage the TWT. This
assembly consists of an isolator, harmonic filter, receive reject filter and three-port
directional coupler. The high power isolator provides a low VSWR to the external
waveguide run and antenna feed. The isolator assists in protecting the TWT from
excessive reflected power due to damaged/broken waveguides or antenna components.
The isolator is rated such that it will safely dissipate all reflected power equal to the full
rated output of the CMPA for the duration of time until the protection circuits shut off the
high voltage power supplies. In addition, the isolator is designed such that it can safely
dissipate a VSWR mismatch of 2.0:1 (12% of forward RF power) indefinitely.
The harmonic filter contained in the output waveguide assembly provides a minimum of
60 dB attenuation to all harmonic products other than the fundamental signal. The receive
band reject filter serves as a high pass filter cutting off below band signals. The filters
used in the VZU-6994 series are designed to minimize noise power density in their
respective receive bands. Finally, the three port directional coupler provides one reflected
power port, coupled via a detector, to the RF power monitor assembly for reverse power
protection, and two forward power meters: one for the user to monitor forward RF power
Ku-Band CMPA 04/08 TD-67 Page 3

via a type N connector on the front panel and one for use by the front panel forward
power metering circuit which uses a similar detector to process the RF signal. The RF
sample port, calibrated in coupling ratio versus frequency, permits independent
monitoring of CMPA output power levels through the use of an external spectrum
analyzer or portable power meter. High reflected RF protection circuitry is standard and
reflected power information is sent to the front panel for display. With forward power
metering comes user settable low and high RF power alarms settable via the front panel
access door.
The output and reflected power level readouts are also available for remote monitoring
via the optional CPI remote panel or the computer interface (CIF) port located on the rear
panel. RF drive is adjustable via these ports as well. The standard RF output interface to
connect the CMPA to the external waveguide run is a WR-75F (flange) termination. The
CMPA comes with a WR-75G (grooved, threaded) rear connector and a waveguide
gasket.
Power Supply Subsystem
Overview
The power supply portion of the CMPA provides all of the internal voltages necessary to
operate the TWT, RF driver (IPA), forced air cooling system and auxiliary circuits for
control, monitoring and protection of the CMPA. Only the AC input power is required for
operation. The travelling wave tube derives its operation from four DC power supplies: a
filament heater low voltage supply, a helix high voltage supply, and two collector high
voltage supplies.
The power supply design utilized in the VZU-6994 is of the switch mode power
conditioner (SMPC) type, which has an excellent reputation for reliability and stability.
An added advantage of the SMPC approach over outdated linear power supplies is its
intrinsic high efficiency and safe operation. By limiting the amount of the instantaneous
stored energy in the power supply, the risk of permanent damage to the CMPA due to
abnormal or transient conditions is avoided. The momentary level of stored energy
(measured in joules) is well below the maximum limit of energy that the tube can safely
dissipate during normal operation. A simplified block diagram of the power supply is
shown in Figure 3. The principal circuit modules are discussed in the following
paragraphs.
Power Factor Correction Module
Input primary power (single phase, 110-240 VAC) flows via a EMI filter and the main
circuit breaker to both the cooling system power supply and the Power Factor Correction
Module. This module provides a regulated 375 VDC to the Power Processor and allows
the CMPA to meet the requirements of EN61000-3-2 regarding total harmonic distortion.
In the event of a failure of this module, a DC bus fault flag is sent to the micro-controller
Ku-Band CMPA 04/08 TD-67 Page 4

for proper fault handling and display via the detail fault LEDs located through the front
panel access door.
Power Processor Module
The power processor circuits provide the necessary line and load regulation of the input
375 volt DC bus, which is converted via a switch regulator and bridge circuit to a
nominal 200 volt, 21 kHz to drive the high voltage module. A sample of the helix high
voltage output is returned to the switch regulator for error feedback correction and sends
a pulse-width modulated signal through an optical isolator to the switching transistors.
This approach allows careful regulation of the TWT helix and collector voltages and
protects both supplies from over voltage/under voltage or short circuit conditions. Low
voltage outputs are also produced by this assembly (+/-15 VDC and 16 VAC) which are
used to operate various internal circuit functions as well as provide power for the RF
monitor circuit, micro-controller assembly, front panel display, and IPA. Internal sensors
provide the necessary over-current protection functions for these supplies.
High Voltage Module
The high voltage module provides the following key power supply functions: regulated
TWT heater supply, regulated TWT high voltage helix and collector supplies, helix
supply current/voltage monitoring and fault protection. The high voltage module contains
the transformers, rectifiers, filters and voltage/current sense resistors for critical TWT
voltages. The incoming 200 volt, 21 kHz signal is applied to the primary of a multi-
section high voltage transformer which provides all of the high voltage levels necessary
to operate the traveling wave tube. Since the helix and collectors share the same
transformer and regulator, the high voltage circuit design establishes the collector
voltages at 50% (collector #1) and 32% (collector #2) depression below the helix voltage.
This relationship permits optimum efficiency and substantial energy savings while
extending the useful life of the TWT. A separate step-down transformer with rectifier and
filter network is employed to provide the heater voltage.
Control and Display Modules
The Control and Display Modules are designed to assure correct operation of the power
amplifier and easy maintainability with minimal operator training and activity.
Microprocessor circuits along with status and fault LEDs provide automatic sequencing
of CMPA operation and continuous monitoring of critical parameters. If a fault should
occur, the CMPA either recycles back to its state prior to the fault or latches into the
FAULT state. In either case, the appropriate front panel lamp will illuminate. Also, a
detail fault display is located inside the front panel access door which can be used in
assisting a maintenance technician in isolating the fault to a replaceable component or
subassembly. The front panel access door also provides a convenient means of allowing
the user to set features such as system configuration and low RF alarm.
Ku-Band CMPA 04/08 TD-67 Page 5

Figure 4 and the Product Specifications below present a complete list of controls,
displays, and LED indicators on the front panels. All panel indicators are reliable, bright
LEDs.
When control power is turned on, the microprocessor self-tests all internal functions and
starts HTD (Heater Time Delay). Once the HTD is completed, the STANDBY indicator
illuminates to tell the operator that the high voltage may be applied. Depressing the
TRANSMIT/STANDBY key initiates the BOS (Beam On Sequence). At the successful
conclusion of BOS, the unit is in the TRANSMIT state (high voltage is on).
Alternatively, the operator may depress the TRANSMIT/STANDBY key during HTD
causing the TX SELECT lamp to illuminate. In this case, the BOS is initiated
automatically at the completion of HTD. In the interest of promoting long life of the
TWT, the heater voltage is reduced by 10 percent whenever the CMPA is in any beam off
state (either STANDBY or FAULT states) for more than one minute.
In the event of AC prime power interruptions, the power supply will automatically
recycle when the AC power is reapplied. If the loss of power is less than a few seconds,
the amplifier will return immediately to its previous state. If the outage is of longer
duration, a proportional HTD is performed before returning to the previous state. The
longest HTD is three minutes.
If a fault occurs during TRANSMIT, the FAULT LED will light and the unit will switch
from TRANSMIT to FAULT. Two scenarios are possible. The first scenario occurs when
a fault lasts less than four seconds (a transient fault) or when fewer than three transient
faults occur within twenty seconds. In this case, the unit will recycle back to
TRANSMIT.Each transient fault will generate a recycle. Each recycle from FAULT to
TRANSMIT will be delayed by one second. After the unit successfully recycles to
TRANSMIT, the RECYCLED FAULT LED will flash until the user presses RESET.
Each fault causes a detail fault LED to illuminate behind the front panel access door. This
LED will remain lit until the RESET button is pressed or power is cycled.
The second scenario occurs when a fault lasts longer than four seconds or when at least
three faults occur within twenty seconds. In this case the unit will be latched into FAULT
and the FAULT LED will flash. To reset the unit for normal operation, clear the source of
the fault. Then, press RESET. If the fault was successfully cleared, the FAULT LED will
extinguish and the unit will be in STANDBY. Press TRANSMIT/STANDBY to resume
transmitting.
In either case, the pertinent fault remains displayed on the detail fault display inside the
front panel access door until hitting the RESET button. This allows the user or technician
the ability to identify individual faults to a specific module or subassembly.
Ku-Band CMPA 04/08 TD-67 Page 6

Power Monitor Module
The RF power monitor assembly receives signals from the forward and reflected power
RF detectors for use in fault/alarm sensing and forward power metering. The reflected RF
fault sensor/recycle circuit protects the TWT against excessive reflected power due to
abnormal waveguide or antenna conditions. Additionally, the forward power metering
circuit measures both continuous wave (CW) and peak RF signals. Also included is a
forward power low RF alarm circuit, which compares the output power with a user-
settable low RF set point and triggers an alarm, should output power fall below this level.
Mechanical Design
General
The VZU-6994 is packaged in a standard rack mounted drawer measuring 19" wide by
5.25" high and 24" deep (plus connectors, fan and air duct adapters). The unit is cooled
via a forced-air cooling system consisting of two axial fans, an air filter and an exhaust
duct. Allowances are made for 0.10" H20 drop due to customer ducting losses.
LRU Philosophy
The CMPA utilizes a modular design approach incorporating LRUs for ease of
maintainability in the field. The maintenance concept employed in the VZU-6994 is to
localize a malfunction or circuit failure down to the level of an LRU, extract the LRU and
replace with an equivalent part provided in the spares kit. This procedure can be
completed in the field without resorting to the costly practice of returning the entire
CMPA to the depot for servicing. The philosophy is to configure the CMPA LRUs as
building blocks with a specific function that can be monitored by sensors and fault
indicators on a real-time basis.
Ku-Band CMPA 04/08 TD-67 Page 7

PRODUCT SPECIFICATIONS
The following specification limits and characteristics apply to the CPI VZU-6994 Series
TWTA unless otherwise specified.
Electrical
Frequency VZU-6994-AC, -AD 13.75 - 14.50 GHz
VZU-6994-AB 12.75 to 14.50 GHz
VZU-6994-AP 14.7 to 15.2 GHz
Output Power
•TWT VZU-6994-AC,-AB,-AP 55.44 dBm min. (350 watts)
VZU-6994-AD 56.02 dBm min. (400 watts)
•flange VZU-6994-AC,-AB,-AP 54.39 dBm min. (275 watts)
VZU-6994-AD 55.31 dBm min. (340 watts)
Bandwidth VZU-6994-AC,-AD 750 MHz
VZU-6994-AB 1750 MHz
VZU-6994-AP 500 MHz
Gain
•at rated power 73 dB min. (88 dB max.)
•small signal 78 dB min. (90 dB max.)
RF Level Adjust Range 0 to 20 dB
Output Power Setability ±0.2 dB
Gain Stability
•at constant drive & temperature ±0.25 dB/24 hr max.(after 30 min. warm-up)
•over temperature, constant drive ±1.0 dB over oper. temp. range
(any frequency)
Small Signal Gain Slope VZU-6994-AC,-AD 0.015 dB/MHz max.
VZU-6994-AB,-AP 0.02 dB/MHz max.
Small Signal Gain Variation
•across any 80 MHz band 1.0 dB pk-pk max.
•across the 500 MHz band 2.5 dB pk-pk max.
•across the 750 MHz band 2.5 dB pk-pk max.
•across the 1750 MHz band 2.5 dB pk-pk max.
Input VSWR 1.3:1 max.
Ku-Band CMPA 04/08 TD-67 Page 8

Electrical, continued
Output VSWR 1.3:1 max.
LoadVSWR
•full spec compliance 1.5 max.
•operation without damage any value
•continuous operation 2.0:1 max.
Residual AM
•below 10 kHz -50 dBc
•10 to 500 kHz -20 [(1.3+log F (kHz)] dBc
•above 500 kHz -85 dBc
Phase Noise
•IESS phase noise profile -6 dB
•AC fundamental -36 dBc
•Sum of all spurs -47 dBc
AM/PM Conversion VZU-6994-AC 2°/dB max. for a single carrier at 8 dB
below rated power
VZU-6994-AB,-AP,-AD 2.5°/dB max. for a single carrier at 8 dB
below rated power
Harmonic Output -60 dBc at rated power, second
and third harmonics
Noise and Spurious (at rated gain)
VZU-6994-AC,-AD,-AP <-150 dBW/4 kHz, 10.9 to 12.7 GHz
VZU-6994-AB <-130 dBW/4 kHz, 10.9 to 11.7 GHz
VZU-6994-AC,-AP <-115 dBw/4 kHz, 11.7 to 12.2 GHz
ALL <-65 dBw/4 kHz, xmit band to 18 GHz
ALL <-105 dBw/4 kHz, 18.0 to 26.0 GHz
ALL <-125 dBw/4 kHz, 26.0 to 40.0 GHz
Intermodulation -24 dBc or better with two equal carriers
at total power level 7 dB below rated single
carrier output (at 4 dB with optional
integral linearizer)
Group Delay 0.01 ns/MHz linear
(in any 40 MHz band) 0.001 ns/MHz2parabolic max.
0.5 ns pk-pk ripple max.
Primary Power 110-240 ±10%, single phase
47-63 Hz
Ku-Band CMPA 04/08 TD-67 Page 9

Electrical, continued
Power Factor 0.95 min. (meets requirements of
EN61000-3-2, total harmonic
distortion)
Power Consumption VZU-6994-AB,-AC,-AP 1.3 kVA (typical)
VZU-6994-AD 1.35 kVA (typical)
VZU-6994-AB,-AC,-AP 1.4 kVA (max.)
VZU-6994-AD 1.5 kVA (max.)
Inrush Current 200% max.
Environmental
Ambient Temperature
•operating -10° to +50°C
•non-operating -40° to +70°C
Relative Humidity 95% non-condensing
Altitude
•operating 10,000 ft., w/ standard adiabatic derating of
2°C/1,000 ft.
•non-operating 40,000 ft.
Shock and Vibration Designed for normal transportation environ-
ment per Section 514.4 MIL-STD-810E. De-
signed to withstand 20G at 11 ms (1/2 sine
pulse) in non-operating condition.
Mechanical
Cooling Forced air w/integral blowers. Rear air intake
and exhaust. Maximum external pressure
loss allowable: 0.10 inches water column.
RF Input Connection Type N Female
RF Output Connection WR-75 waveguide flange, grooved, threaded
UNC 2B 6-32
RF Output Monitor Type N Female
Dimensions, (W x H x D) 19 x 5.25 x 24 in. (483 x 133 x 610 mm)
Weight 60 lbs (27.3 kg) max.
Ku-Band CMPA 04/08 TD-67 Page 10

Heat and Acoustic
Heat Dissipation 1100 watts max.
Acoustic Noise 65 dBA (as measured at 3 ft.)
MONITORS AND CONTROLS
Control Functions Main Power On/Off
TX (Transmit) Select
Transmit/Standby (Beam on/off)
RF Drive Adjust (manual standard)
Local/Remote/Computer (CIF) Select
Indicator Test
Fault Reset
Monitoring RF Output Power
Attenuator Setting
RF Output Sample Port (-40 dBm nominal,
Type N)
RFReflectedPower(W)
Helix Current (mA)
HelixVoltage(kV)
Control/ Status Display Power On
Heater Time Delay (HTD)
TX (Transmit) Select
Standby
Transmit (Beam on)
Local/Remote/CIF
Meter Select
Fault/Alarm Display Recycled Fault
Fault
Low RF
High Reflected RF
Interlocks Open (power supply temp. or am-
plifier cover)
Helix Over-current
Helix Voltage
Power Supply Arc
DC Buss Fault
TWT Over-temperature
Ku-Band CMPA 04/08 TD-67 Page 11

REMOTE CONTROL INTERFACE
Control Functions Transmit/Standby (Beam on/off)
Fault Reset
RF Drive Adjust
Monitoring RF Output Power
RF Reflected Power
Helix Current
Helix Voltage
Attenuator Setting
Control/ Status Power On/Off
TX Select (Transmit Select)
Heater Time Delay (HTD)
Standby
Transmit (Beam on)
Local/Remote/Computer I/F
Meter Select
Fault/Alarm Displays Recycled Fault
Fault
OPTIONS AND FEATURES
Options & Compatibility Integral linearizer
External receive band reject filter (increases
loss by a minimum of 75 dB, up to 12.75 GHz
for standard band; and by a minimum of 50 dB
up to 11.7 GHz for extended band)
Remote Control Panel
Redundant and Power Combined Subsystems
100 VAC Primary Power
Features PIN Diode Attenuation Standard
Forward Power Metering Standard
Designed to meet EN60215/EN61000-3-2 Safety/
Harmonic standards as well as 2004/108/EC
EMC Standards
Filament voltage reduction of 10% in standby
RS-232/422/485 (4-wire) computer interface
standard
Ku-Band CMPA 04/08 TD-67 Page 12

OPTIONS AND FEATURES, continued
Features (cont’d) Auto Fault Recycle
Internal test points for ease of maintenance
MTTR < 1 hour
Also available in 400 Watt C-Band
and 400 W X-Band
Characteristics and performance limits are based on current data and are subject to change without
notice. Please contact CPI Satcom Division before using this information for system design.
ACCESSORIES
Several optional accessory items have been designed for use with CPI Ku-band CMPAs.
Brief descriptions of the items now available are given on the following paragraphs.
Protection Switching
The Switching System consists of an output waveguide switch, dummy load and local
control unit. These assemblies are usually mounted on the upper part of a rack/cabinet
intended to house the two CMPAs. The circuit provides 1:1 redundant protection with
automatic transfer, or manual operation (local or remote) as selected by the operator. For
servicing, the logic assembly can be removed from the front panel without disturbing the
RF connections. Options are available for the addition of an input power divider or a
ganged input transfer switch.
Phase Combining
The Phase Combiner consists of a coaxial input divider network and phase shifter and an
output waveguide combining system. The combiner is an electrically operated variable-
ratio hybrid, which provides the following operating modes:
1) PA1 and PA2 combined on line
2) PA1 on line, PA2 to dummy load
3) PA2 on line, PA1 to dummy load
4) PA1 and PA2 combined to dummy load
In the normal combining mode a fault in one PA will automatically index the combiner to
mode (2) or (3), providing the "soft fail" protection of full output from the surviving PA.
In the manual mode the operator may select by push-button any one of the four operating
modes.
The combiner assembly is packaged in a 19-inch rack-mountable enclosure measuring 7
inches high and 24 inches deep.
Ku-Band CMPA 04/08 TD-67 Page 13

The combiner assembly can also be supplied mounted in the rack/cabinet which houses
the two CMPAs to provide an integrated power-combined CMPA system.
Integral Linearizer
The Integral Linearizer is an input device intended to improve the intermodulation
characteristics of the CPI CMPAs. The unit functions predistort the RF input signal to
compensate for the amplitude and phase non-linearities inherent in the TWT. In most
applications the CMPA can then be operated 3 dB or more higher in output power (i.e.
less back-off) for a given intermodulation ratio.
Remote Control Panels
The Remote Control/Monitor panel is a rack-mountable unit 5.25 inches high that
provides an output RF power meter and all of the remote controls and indicators listed in
this brochure. The panel requires a source of AC power and it does not include the
interconnect cable from the CMPA. The cable requires 24 conductors plus a shielded
pair, and practical wire sizes limit the length to about 1100 feet (335 meters).
Remote control/monitor panels are also available for use with the Switching System and
Phase Combiner.
SUPPORT SERVICES
Documentation
CPI Satcom Division provides a standard commercial documentation package for all
products. The standard package for satellite communications power amplifiers includes a
comprehensive operation and maintenance manual, outline and interface drawings and
acceptance test procedure/report (ATP).
The technical manual provides instruction for unpacking and installation, initial set-up,
calibration, normal operation, maintenance and repair of the equipment. The manual
includes schematic diagrams, block diagrams, and wiring information sufficient for use
by maintenance personnel. Outline and interface drawings provide dimensions and the
location and size of mounting holes, duct work, and waveguide, so that site preparation
can be accomplished prior to receipt of the equipment.
The ATP outlines the tests performed, circuit and test equipment used, and limits
established. Space is provided for recording and certifying the test results, consolidating
all related information in one document. The spare parts documentation package consists
of a commercial recommended spare parts list to support the equipment for a one-to-two
year period of operation.
Ku-Band CMPA 04/08 TD-67 Page 14

SUPPORT SERVICES, continued
Training
CPI Satcom Division is prepared to conduct training courses covering the installation,
operation and maintenance of its equipment. The training course on high power
amplifiers consists of lectures using training material, such as technical manuals and
drawings, plus actual operation and adjustments demonstrated on the equipment.
Small training groups (up to five students) assure the customer that each student has an
opportunity to participate fully in demonstration activities. Courses may be conducted at
the CPI factory or on-site. Course duration varies from two days to one or two weeks,
depending on the scope of work agreed upon and the skill level of the students.
Field Service
The product support activity of CPI includes a staff of experienced, professional service
technicians to assist users in maintaining full performance from their CPI power
amplifiers. A telephone “hot line” permits access to one of these technicians on a 24-hour
per day basis. Operational problems often can be diagnosed, corrective action prescribed,
and normal operation restored through telephone consultation. When called for, however,
the service technicians are prepared to give on-site assistance.
Product Support carries an inventory of spare parts that can be made ready for shipment
within 24 hours. Coupled with a dedicated dial-in telephone line, this service is effective
in aiding users to restore equipment to operational status with minimum downtime.
Technical assistance and factory approved replacement parts are also available at
strategically located Regional Service Centers in the U.S.A., South America, Europe,
Africa and the Pacific Rim.
Ku-Band CMPA 04/08 TD-67 Page 15

Figure 1. CMPA Outline Drawing (ref. 01018602 rev A dtd 02/06)
Note: Before using this drawing for system design, please check with CPI to ensure that it is the latest revision
Ku-Band CMPA 04/08 TD-67 Page 16

RFINPUT
INPUT
ISOLATOR
*SOLID STATE
AMPLIFIER INPUT
ISOLATOR TWT INT EGRA TED RF OUTPUT ASSEMB LY
RFOUTPUT
(WR-75G ROO VED)
40 DB 59 D B 50 DB
RFOUTPUT
SAMPLE PORT
(TYPE'N'FEMALE)
RF OUTPU T
POWER RF REFLECTED
POWER
*Contains integral PIN DiodeAttenuator
Figure 2. CMPA RF Diagram
Ku-Band CMPA 04/08 TD-67 Page 17

CMPA 04/08 TD-67 Page 18
EMI
Filter
AC
Input Circuit
Breaker Fan
Power
Supply Fans
Power Factor
Correction
Module Power
Processor
375 V C
Basic Remote Control
Switchin g I/F
Serial Remot e Control
(For use with CPI Remote Panel)
ComputerI/F
User Interlocks
Control
&
Display
Micro-controller
RF Metering
& Faults
Control
&
DC Power
Monitor
Control
HV
Module
Helix
Cathode
Coll 2
RF Subsystem
TWT
DC
Power
SSIPA
(with attenuator)
RF Monitor
Figure 3 - Power Supply Block Diagram
D
DC
Power
VDC
Coll 1
28
100-240
VAC
Ku-Band