M-Band J Series Compact Medium Power Amplifier VZM
Contents
1. 15 dB max TD 82 8 Electrical Cont Intermodulation Primary Power Power Factor Power Consumption Inrush Current Environmental Ambient Temperature operating non operating Relative Humidity Altitude operating non operating Shock and Vibration M Band J Series CMPA VZM 6993J4 04 00 24 dBc typical with two equal carriers at total power level 7dB below rated single carrier output 220 240 10 single phase 47 63 Hz 0 95 min meets requirements of EN60555 2 total harmonic distortion 1 4 typ 1 5 max 200 max 10 to 40 C 40 to 70 C 95 non condensing 10 000 ft w standard adiabatic derating of 2 C 1 000 ft 40 000 ft As normally encountered in a protected engineering laboratory environment and in shipping via commercial carriers in CPI provided containers TD 82 9 Mechanical Cooling RF Connections Input Connection Output Connection Output Monitor Dimensions W x H x D Weight Heat and Acoustic Heat Dissipation Acoustic Noise M Band J Series CMPA VZM 6993J4 04 00 Forced air w integral blowers Rear air intake and exhaust Maximum external pressure loss allowable 0 10 inches water column Type N Female WRD 750 waveguide flange Type N Female 19x 5 25 x 24 in 483 x 133 x 610 mm 70 Ibs 32 kg max 1 250 Watts max 65 dBA as measured at 3 ft TD 82 10 MONITORS AND CONTROLS FRONT PANEL Contr2. mote monitor and control Control fault and monitor ing functions are available via the IEEE 488 interface designed to interface directly with a computer an RS 422 485 port to be used when the optional CPI remote control panel is purchased 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 J Series CMPA Digital attenuation allows for RF drive attenuation ad justment via the remote interface ports thereby enhanc ing remote monitor and control capabilities ey Zum EN PR Figure 1 J Series CMPA M Band J Series CMPA VZM 6993J4 04 00 TD 82 2 To expedite field maintenance procedures the VZM 6993J4 CMPA utilizes a modular design approach consisting of Line Replaceable Units LRUs which permit service personnel to maintain the J Series 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 The overall amplifier enclosure measures approxi mately 19 w x 5 25 h x 24 d plus air duct adapters and weighs approximately 70 lbs TWT Amplifier can be installed in a 1 1 1 2 or 1 3 auto switching or power combined configura
3. PPM focused helix design It is lightweight and de signed especially for harsh environments in a wide variety of applications over temperatures of 40 C to 110 The output waveguide coupler assembly interfaces to the TWT and provides both a forward and reverse sample of the RF output This coupler is a broadwidth design to assure good flatness and directivity over the full 8 18 GHz band The two port directional coupler provides one re flected power port coupled via a detector to the RF DUAL DIRECTIONAL COUPLER Figure 2 J Series CMPA RF Diagram M Band J Series CMPA VZM 6993J4 04 00 tH RF OUTPUT WRD 750 al M _ RF MONITOR A TYPEN FEMALE lt lt lt TD 82 3 power monitor assembly for reverse power protection and a forward power sample The forward sample is further split by a coaxial coupler into two samples one for the user to monitor forward RF power via a type connector on the front panel and one for use by the front panel forward power metering circuit which uses a thermoelectric power monitor to process the RF signal The RF sample port is nominally 57 dB and permits independent monitoring of J Series CMPA output power levels through the use of an external spectrum analyzer or portable power meter Low and high RF power alarms are user settable via the front panel access door High reflected RF soft fail protection circuitry is stan dard and reflected power in
4. solid state intermediate power amplifier IPA optional Input Iso lator input RF Gain control RF detectors and output directional couplers for monitoring and protection The power supply section includes the power factor cor rection power processor and high voltage regulation circuitry It also contains all monitor control and pro tection circuits necessary to permit safe efficient and reliable operation of the J Series CMPA The VZM 6993J4 CMPA is protected from opera tional damage caused by abnormal AC DC RF faults or insufficient cooling The amplifier will automatically recycle itself after a prime power interruption or tran sient fault condition Personnel safety is of utmost importance and is safe guarded by proper grounding and by access interlocks and shields which prevent physical entry into the high voltage sections E e Lf nly The front panel of the unit serves as the primary user interface housing all monitor and control functions in cluding 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 and a set of detail fault LEDs to help troubleshoot during operation Principal functions are also brought to the four user interface connectors located on the rear panel for re
5. 13915 JH SEP INTOJ b apel apail _ a p Bi TAPS W bR 278 9 09 16 HIMMHM 1 1534 18 TD 82 04 00 M Band J Series CMPA VZM 6993J4 ZH 009 01 ZHJ 0S INV Ienpiseg 8 4 725 15 FH B Bg BBS 3015 HEW F ape Bes Ou 6 HERE JAPSE EB ZH H Bae EE HHHH FHA MAA B5 18815 3gp LN3HOdMOD J8 ATO Bi B bb 238 16101533 19 TD 82 04 00 M Band J Series CMPA VZM 6993J4 eu TET S 49 E Hdg Aejag dnoiy 6 aunbi4 ZH GST Ns HO cC dim 5 Tes TEN 1T 1C 2E pi Su g T SU TD 82 20 04 00 M Band J Series VZM 6993J4 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 detailed installation and operation manual outline and interface drawings and Test Performance Sheet TPS The O amp I manual provides instruction for unpacking and installation initial set up calibration normal op eration and scheduled maintenance of the equipm
6. 2 7 PRODUCT SPECIFICATIONS The following specification limits and characteristics apply to the 250 W VZM 6993J4 Series unless otherwise specified Electrical Frequency Output Power flange Instantaneous Bandwidth Gain eat rated power esmall signal RF Attenuator Adjust Range Output Power Resolution Gain Stability eat constant drive amp temperature over temperature constant drive Small Signal Gain Variation across the 10 0 GHz band Input VSWR Output VSWR Load VSWR efull spec compliance operation without damage continuous operation Residual AM below 10 kHz 10 to 500 kHz eabove 500 kHz Phase Noise AM PM Conversion Harmonic Output Noise and Spurious at rated gain Noise Figure M Band J Series CMPA VZM 6993J4 04 00 8 0 to 18 0 GHz 54 0 dBm min 250 watts 53 5 dBm min 225 watts 10 0 GHz 53 5 dB min 55 5 dB min 0 to 20 dB within 0 2 dB max 0 25 dB 24 hr max after 30 min warm up 12 dB pk pk typ See Figure 1 2 5 1 max 1 5 1 max with optional input isolator 2 5 1 typical 1 5 max any value 2 0 1 max for full output power any value under soft fail mode 50 dBc 20 1 3 log F kHz dBc 85 dBc Meets IESS 308 309 phase noise profile with 3 dB margin 1 5 dB typical for a single carrier at 8 dB below rated power 3 dBc typical at lower band edge decreasing to 15 dBc typical at upper band edge 50 dBc excluding harmonics
7. 4 J Series Front Panel M Band J Series CMPA VZM 6993J4 04 00 TD 82 6 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 suc cessfully 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 able user or technician the ability to identify individual faults to a specific module or subassembly Power Monitor Circuits 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 forward power detector is a thermo electric power monitor which provides optimum flatness over the frequency band The reflected RF fault sensor recycle circuit protects the TWT ag
8. 63J2 2 0 8 0 GHz and the VZL 6943J2 1 0 2 5 GHz cover the full 1 0 18 0 GHz in three units The J Series CMPA family is a member of a comprehensive line of communication amplifiers including TWT Low Power Amplifiers LPAs Medium Power Amplifiers MPAs High Power TWT Amplifiers HPAs and High Power Klystron Amplifiers KPAs designed specifically for service in commercial satellite earth stations operating in standard SATCOM 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 commercial Satcom and Industrial power amplifiers Today CPI Satcom Division has provided thousands of fully integrated satellite uplink power amplifiers in the S C Ku X M DBS and Ka band frequency ranges to worldwide users and has become the leading supplier of this class of products J Series M Band J Series VZM 6993J4 04 00 TD 82 1 EQUIPMENT DESCRIPTION General The VZM 6993J4 CMPA Figure 1 is packaged ina 5 25 inch tall slide mounted drawer suitable for stan dard 19 inch rack mounting This enclosed assembly houses both the RF and power supply sections of the amplifier The RF section includes the TWT
9. BY key initiates the BOS Beam On Sequence Atthe 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 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 re cycle from FAULT to TRANSMIT will be delayed by f N TRANSMIT STANDBY e Ss RF SAMPLE 4 Figure
10. WT helix and collector voltages and protects both supplies from over voltage under voltage or short cir cuit 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 SSIPA 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 sup plies helix supply current voltage monitoring and fault protection The high voltage module contains the trans formers rectifiers filters and voltage current sense re sistors 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 travel ing wave tube Since the helix and collectors share the same transformer and regulator the high voltage circuit design establishes the collector voltages at 5096 col lector 1 and 32 collector 2 depression below the helix voltage This relationship permits optimum efficiency and substantial energy savings while extend ing the useful life of the TWT A separate step down transformer with rectifier and filter network is e
11. ainst excessive reflected power due to abnormal waveguide or antenna condi tions 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 M Band J Series CMPA VZM 6993J4 04 00 Mechanical Design General The VZM 6993J4 Series CMPA 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 H 0 drop due to customer ducting losses LRU Philosophy The CMPA utilizes a modular design approach incor porating LRUs for ease of maintainability in the field The maintenance concept employed in the VZM 6993J4 Series CMPA 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 J Series CMPA to the depot for servicing The philosophy is to configure the LRUs as building blocks with a specific function that can be monitored by sensors and fault indicators on a real time basis TD 8
12. ent The manual includes a block diagram outline and inter connect drawing Outline and interface drawings pro vide dimensions and the location and size of mounting holes duct work and waveguide so that site prepara tion can be accomplished prior to receipt of the equip ment The TPS outlines the factory tests performed and limits established Space is provided for recording and certifying the test results consolidating all related infor mation in one document An optional comprehensive Service manual is also available The Service manual provides detailed theory of operation instructions for troubleshooting and main tenance adjustments and calibration of the equipment The manual includes schematic diagrams block dia grams and wiring information sufficient for use by maintenance personnel On request a spare parts documentation package is available This consists of a commercial recommended spare parts list to support the equipment for a one to two year period of operation Training CPI Satcom Division is prepared to conduct training courses covering the installation operation and mainte nance of its equipment The training course on high power amplifiers consists of lectures using training ma terial 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
13. enuator setting V Metering RF Output Power Watts or dBm Resolution greater of 1 W or 0 1dB Status Display Heater Time Delay HTD 180sec nominal proportional TX Transmit Select Standby Transmit Beam On Local Remote serial Remote GPIB Fault Alarm Display Recycled Fault Automatic fault recycle 3 times Fault Low RF or High RF High Reflected Power Interlocks Open power supply temp or amplifier cover Helix Over current Helix Voltage Power Supply Arc DC Bus Fault TWT Over temperature Soft Fail active SSIPA Over current A vailable on RS422 485 port and Local Front Panel Only M Band J Series CMPA VZM 6993J4 04 00 TD 82 12 OPTIONS amp FEATURES Options amp Compatibility Features Primary Power Remote Control Panel Redundant and Power Combined Subsystems Input isolator Input VSWR is reduced to 1 5 1 max Soft Fail Reflected Power Protection Integral microprocessor controlled RF Gain Standard Forward Power Metering Standard Designed to meet EN61010 EN60555 2 Safety Harmonic standards as well as 89 336 EEC EMC Standards Filament voltage reduction of 10 in standby 488 RS 422 485 4 wire remote interfaces standard Auto Fault Recycle Utilizes high efficiency dual depressed collector traveling wave tube Internal test points for ease of maintenance plus BIT diagnostic front panel LEDs MTTR lt 1 hr Also available in 250 W L and S C Band models Characteristics and
14. formation is sent to the front panel for display The output and reflected power level readouts are also available for remote monitoring via the optional CPI remote panel or the computer interface RS 422 485 EMI Circuit m Filter Breaker Fans 208 240 VAC and IEEE 488 ports located on the rear panel RF drive is adjustable via these ports as well The standard RF output interface to connect the J Series CMPA to the external waveguide run is a WRD 750 waveguide flange Soft Fail Reflected Power Protection Reflected power is monitored in part to protect the TWT The M band J Series CMPA employs a Soft Fail protection feature to allow operation even under output mismatch conditions that cause excessive re flected power To protect the TWT this feature ac tively reduces the RF output power to keep the re flected power below the reflected power trip point With the factory setting of 25 W trip level the actual reflected power will be actively limited during opera tion to around 22 W by the CMPA controller by reducing the RF gain Once the reflected power drops below 17 W soft fail operation will end and normal operation is restored In the soft fail mode the Re flected RF meter LED will flash Power Factor Correction Power Processor p AN Module 375 VDC Control DC Power RF Subsystem Helix gt Cathode gt Flash RAM Pro
15. gramming 4 gt Switching I F gt Serial Remote I F RS 422 485 4 IEEE 488 Remote lt gt User Interlocks lt _ Micro controller Coll 1 TWT oll Monitor Heater Linearizer optional Gain Control Control Display RF Metering amp Faults SSIPA RF Monitor Figure 3 Power Supply Block Diagram M Band J Series CMPA VZM 6993J4 04 00 TD 82 4 Power Supply Subsystem Overview The power supply portion of the J Series CMPA provides all of the internal voltages necessary to oper ate the TWT RF driver SSIPA forced air cooling system and auxiliary circuits for control monitoring and protection Only the AC input power and RF input drive 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 VZM 6993J4 Series 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 J Series CMPA due to abnormal or tran
16. ie PE 4 811 Hansen Way Palo Alto CA 94303 mEnE Phone 650 846 3700 satcom division Fax 650 424 1744 Technical Description M BandJ Series Compact Medium Power Amplifier VZM 6993J4 INTRODUCTION This document provides a detailed technical description of the Communications amp Power Industries Inc CPI VZM 6993J4 Series M band Compact Medium Power Amplifier CMPA a 250 Watt medium power traveling wave tube amplifier designed specifically for broadband microwave applications such as EMC and general purpose testing The J Series CMPA is compact and lightweight and employs a state of the art wideband Traveling Wave Tube TWT The TWT permits continuous efficient instantaneous operation across the entire 8 0 to 18 0 GHz frequency The J Series CMPA also incorporates the use of a microprocessor control system thereby simplifying interfacing with remote control and monitor facilities Both RS 422 485 and IEEE 488 interface ports are included as standard features Microwave features include a Solid State Intermediate Power Amplifier SSIPA microprocessor controlled RF gain control and soft fail VSWR protection The J Series also features active power factor correction 0 95 min which allows the unit to meet the total harmonic distortion requirement of EN60555 2 Itis also designed to meet EN61010 safety and 89 336 EEC electromag netic compatibility requirements The VZM 6993J4 Series CMPA along with the VZS C 69
17. m ployed to provide the heater voltage TD 82 5 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 J Series CMPA operation and continuous monitoring of critical parameters If a fault should occur the J Series CMPA either recycles back to its state prior to the fault or latches into the FAULT state In either case the ap propriate 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 mainte nance 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 Figure 4 and the Product Specifications below present acomplete list of controls displays and LED indica tors on the front panels All panel indicators are reli able 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 gt 24 N METER SELECT that the high voltage may be applied Depressing the TRANSMIT STAND
18. ol Functions Main Power On Off TX Transmit Select Transmit Standby Beam on off RF drive adjust Local Remote Computer CIF Select Indicator Test Fault Reset Fault Settings Serial Port Settings Monitoring RF Output Sample Port 57 dB nominal Type N female RF Reflected Power Watts Helix Current mA Helix Voltage kV Elapsed time meter hours Controls Status Display Power On Heater Time Delay HTD 180sec nominal proportional TX Transmit Select Standby Transmit Beam On Local Remote CIF Meter Select Fault Alarm Display Recycled Fault Automatic fault recycle 3 times Fault Low RF with Forward Power Metering Option High Reflected Power Interlocks Open power supply temp or amplifier cover Helix Over current Helix Voltage Power Supply Arc DC Bus Fault TWT Over temperature Fault Log Metering RF Output Power Watts and dBm Resolution greater of IW or 0 1dB Accuracy 10 at 12 GHz factory calibration 2 5 dB over frequency Calibration can be set at individual freq by user M Band J Series CMPA VZM 6993J4 04 00 TD 82 11 REMOTE CONTROL INTERFACES Standard interfaces RS 422 485 4 wire and IEEE 488 listener talker Control Functions TX Transmit Select Transmit Standby Beam on off Set RF Attenuator Set RF Output Power Remote Computer CIF Select Inhibit RF Fault Reset Set RF Alarm and Fault Trip Points Monitoring RF Reflected Power Watts Helix Current mA Helix Voltage kV RF Att
19. par ticipate 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 ac cess 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 Techni cal assistance and factory approved replacement parts are also available at strategically located Regional Ser vice Centers in the U S A Europe and the Pacific Rim M Band J Series CMPA VZM 6993J4 04 00 TD 82 21
20. 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 M Band J Series CMPA VZM 6993J4 04 00 TD 82 13 ACCESSORIES Several optional accessory items have been designed for use with the CPI 250 W J Series M band CMPAs Brief descriptions of the items now available are given on the following paragraphs Phase Combining The Phase Combiner consists of a coaxial input divider network and phase shifter and an output waveguide combining system The combiner assembly is packaged in a 19 inch rack mountable enclosure The combiner assembly can also be supplied mounted in the rack cabinet which houses the two J Series CMPAs to provide an integrated power combined CMPA system Remote Control Panels The Remote Control Monitor panel is a rack mount able unit 5 25 inches high that provides an output RF power meter and all of the remote controls and indica tors listed in this brochure The panel requires a source of AC power and it does not include the interconnect cable from the J Series CMPA The cable requires 4 conductors plus a shield and practical wire sizes limit the length to about 1100 feet 335 meters The J Rack remote RS422 485 interface is used with the Remote Control Panel M Band J Series CMPA VZM 6993J4 04 00 TD 82 14 Typical Performance Data Listed below are some typical test data taken on a
21. sient con ditions is avoided The momentary level of stored en ergy measured in joules is well below the maximum limit of energy that the tube can safely dissipate during any condition A simplified block diagram of the power supply is shown in Figure 3 The principal circuit mod ules 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 al lows the CMPA to meet the requirements of EN60555 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 for proper fault handling and display via the detail fault LEDs located through the front panel access door M Band J Series CMPA VZM 6993J4 04 00 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 modu lated signal through an optical isolator to the switching transistors This approach allows careful regulation of the T
22. standard production unit This data is followed by several graphs in Figures 5 1 Rated Power and Gain Frequency GHz Saturated P out dBm Gain at 224 W dB RF Sample Port dB 8 0 54 7 56 2 9 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 2 Small Signal Gain 60 4 dB min See Figure 5 3 SSG Variation 11 0 dB p p max See Figure 5 4 Residual AM See Figures 6 7 and 8 0 10 kHz 82 dBc at 980 Hz 10 50 kHz 85 dBc at 41 6 kHz 50 500 kHz 83 0 dBc at 92 7 kHz 5 Group Delay See Figure 9 M Band J Series CMPA VZM 6993J4 04 00 TD 82 15 ZH 2 0 SED zD asuodsay jeubis jews 4 2 BOVAAAAAD AT lt s1LLN 35 Got STO YEP B S ge GE S 3M 16 TD 82 04 00 M Band J Series CMPA VZM 6993J4 ZH 01 012 0 Ienpisay 9 4 2 AAT 7H M 235 ee 15 21 4015 BREE 48H PETI ANINDA JB Uu Ge dag 9 Te AIU BU 81 ZH B BEB HIAMUH JH Bk 338 01534 17 TD 82 04 00 M Band J Series CMPA VZM 6993J4 ZH 0S 0 ZH 01 NY Z 4 Jas 15 BBE ZH B BuB B5 4015 B ged Bl
23. tion as needed by end user mission RF Subsystem conservative field proven approach is utilized in the J Series 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 J Series CMPA via a type N connector located at the rear of the enclosure The input VSWR is less than 2 5 1 and can be further reduced with the optional input isolator to a level of 1 5 1 or less back to the source The RF INPUT SOLID STATE ISOLATOR AMPLIFIER TWT Sse m RF INPUT Oe Se gt m TYPEN FEMALE wer Contains integral RF Gain Control TO RF MONITOR CCA A7 input is then routed to the SSIPA which includes an internal variable RF attenuator The attenuator has a user control range of 20 dB plus an additional 15 dB of range for the soft fail VSWR feature The IPA is designed to be transparent to final amplifier RF param eters The output of the SSIPA is then fed to the input of the TWT The SSIPA and TWT provide a com bined subsystem gain of at least 54 dB at rated power The overall J Series CMPA gain is specified to be stable within 0 25 dB 24 hours with 10 line volt age variations The primary microwave power amplifier in the VZM 6993J4 is the CPI 6294 4 TWT The TWT is an efficient design featuring conduction cooling dual depressed collectors and Periodic Permanent Magnet
Download Pdf Manuals
Related Search