S/C-Band J Series Compact Medium Power Amplifier VZS/C
Contents
1. 2 waslat caies 11 429 1 9 2 ow SA94 E 16 TD 79 S C Band J Series CMPA VZS C 6963J2 04 00 PRASE TEST S N B2 SPURI Chel 3945A Carrier 2 6 8 3 1356 15 85 a aa ATT H E a a seh eg H ud 1 E fere O 2 222222 17 i LZE 1x 1 15 ve 14 Figure 4 Typical Phase Noise Performance S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 17 235 ZH 6 BAR 6661 AtW E aef 801 21495 126369257 15 01 4015 28098 08 ZH 07061 Aejag 6 ZH Bi ZH GE MAY ZH 87 14415 AIU Ad 01 281 338 J gt ANINO 18 TD 79 S C Band J Series CMPA VZS C 6963J2 042. The power supply design utilized in the VZS C 6963J2 series CMPA 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SMPC type which has an excellent reputation for reliability and stability An added advantage of the SMPC approach over outdated linear power supplies is its intrinsic high effi ciency and safe operation By limiting the amount of the instantaneous stored energy in the power supply the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 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 simpli fied block diagram of the power supply is shown in Figure 3 on the previous page The principal circuit modules are discussed in the following paragraphs TD 79 4 Power Factor Correction Module Input primary power single phase 208 240 VAC 10 47 63 Hz flows via an EMI filter and the main circuit breaker to both the cooling system blower and the Power Factor Correction Module This module provides a regulated 375 VDC to the Power Proces sor and allows the J Series CMPA to meet the require ments of EN60555 2 regarding total harmonic distor tion 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 Power Processor Module The power processor circuits provide the necessary line and load regulation of
3. decreasing to 15 dBc at high band edge 50 dBc excluding harmonics 15 dB max single phase 208 240 VAC 10 47 63 Hz TD 79 7 Electrical Cont Power Factor Power Consumption Inrush Current Environmental Ambient Temperature operating non operating Relative Humidity Altitude operating non operating Shock and Vibration Mechanical Cooling RF Input Connection RF Output Connection RF Output Monitor Dimensions W x H x D Weight Heat and Acoustic Heat Dissipation Acoustic Noise 0 95 min meets requirements of EN 60555 2 total harmonic distortion 2 1 typical 3 0 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 50 000 ft As normally encountered in a protected engineering laboratory environment Forced air w integral blowers Rear intake and exhaust Maximum external pressure loss allowable 0 25 inches water column Type N Female Type N Female Type N Female 19 x 8 75 x 26 in 483 x 222 x 661 mm 95 Ibs 43 kg max 2 200 Watts max 65 dBA as measured at 3 ft 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 S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 8 Front Panel Monitors and Controls Control Functions Monitor
4. 00 ZH 01 0 ZHY 0 9 1 235 2 15 ZH BEL ZH GE Mad ZH 47800 4015 67 24015 p 21485 8 8 AITAL Gt ZH EI 7 338 iNGNOdHOD 29 1 27 19 TD 79 S C Band J Series CMPA VZS C 6963J2 04 00 ZH 0S 0 ZH 01 WV lenpisey Z 235 278 15 2 zZH ZH 702 S 4015 ZH 1515 pr 4 6661 E a 1 9692057 4 ou papo iy JaP99 2 61 07854 4 27 TD 79 20 S C Band J Series CMPA VZS C 6963J2 04 00 ZH 00S 0 ZH 06 WV 78 anG 345 81 15 ZH 005 MAY ZH ABS 4015 ZH 47000 S 18815 290 143403402 JH 17 969052 spay JUPSE ZH 8 52 1 2 241 07 559 TD 79 21 5 J Series VZS C 6963J2 04 00 SUPPORT SERVICES Documentation CPI Satcom Division provides a commercial docu mentation package for all products The content of this package is determined by the nature of the product concerned and the quantity is governed by contractual requirements The standard package for Satcom power amplifiers includes a comprehensive Operation an
5. two and half minutes the transfer is complete To enhance the reliability of this approach a backup version of the J Series CMPA s software exists inan EPROM This version is not updated nor can it be via the auxiliary serial port when the Flash RAM contents are updated If the Flash RAM con tents are corrupted the J Series CMPA can use the EPROM based program Also when the J Series CMPA is powered up the user may force the J Series CMPA to use the EPROM based program Figure 4 and the Product Specifications below present acomplete list of controls displays and LED indica tors on the front panels TD 79 5 When control power is turned 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 key initiates the BONS Beam On Se quence At the successful conclusion of BONS the unit is in the TRANSMIT state high voltage is on Alternatively the operator may depress the TRANS MIT key during HTD causing TX SELECT to be displayed on the front panel In this case the BONS is initiated automatically at the completion of HTD 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 s
6. CMPA system S C Band J Series CMPA VZS C 6963J2 04 00 Remote Control Panels The Remote Control Monitor panel is a rack mount able unit 3 5 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 ideal interconnect cable would include two twisted pairs enclosed in shield several wire manufacturers build cable specifi cally for RS 422 485 applications Since the RS 422 485 serial format is used cable lengths are limited to 4 000 feet Remote control monitor panels are also available for use with the switching system and phase combiner systems TD 79 14 Medium Band J Rack Typical Test Data Gain and Output Power Swept Gain Response SSG Variation Group Delay Residual AM e 0 10kHz e 10 kHz 50 kHz e 50 kHz 500 kHz Residual PM Frequency Sat Power Out Gain at Rated GHz dBm Power dB 2 0 55 7 67 1 3 0 56 8 69 5 4 0 55 2 68 3 5 0 56 1 70 6 6 0 55 7 69 5 7 0 55 1 65 7 8 0 54 8 69 9 See Figure 3 11 67 dB max 1 0 nsec pk pk See Figure 5 Figures 6 8 80 dBc 40 9 dBc See Figure 4 S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 15 ue 14 5 FHO SALNSO g a
7. IPTION General The VZS C 6963J2 series CMPA Figure 1 is pack aged 8 75 inch tall slide mounted drawer suitable for standard 19 inch rack mounting This enclosed assembly houses both the RF and power supply sec tions of the amplifier The RF section includes the TWT solid state intermediate power amplifier IPA RF detectors output directional couplers and optional input isolator The power supply section includes the power factor correction power processor and high voltage regulation circuitry It also contains the micro processor based monitor and control system necessary to permit safe efficient and reliable operation of the J Series CMPA The VZS C 6963J2 series CMPA is protected from operational damage caused by abnormal AC DC RF faults or insufficient cooling The amplifier will auto matically recycle itself after a prime power interruption or transient 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 The unit is certified by TUV to meet EN61010 safety standards The front panel of the unit serves as the primary user interface housing the monitor and control system in cluding a type N RF connector to sample and measure output RF power The front panel of the unit includes a keypad indicator LEDs and a vacuum fluorescent alphanumeric display All unit functions c
8. SSS 811 Hansen Way Alto CA 94303 Wirciess 650 846 3700 satcom division Fax 650 424 1744 Technical Description 9 C Band J Series Compact Medium Power Amplifier VZS C 6963J2 INTRODUCTION This document provides a detailed technical description of the CPI VZS C 6963J2 L band J Series Compact Medium Power Amplifier CMPA designed specifically to provide broadband high power microwave output for EMC and general purpose test applications Its compact lightweight implementation of a wide band traveling wave tube permits continuous efficient operation across the entire 2 0 to 8 0 GHz frequency range A micropro cessor based system performs all of the J Series CMPA s monitor and control functions Flash RAM based program instructions are easily updated via a serial port using a PC instead of requiring unit disassembly to access an integrated chip EPROM Additionally it features power factor correction 0 95 min allowing the unit to meet the total harmonic distortion requirement of EN60555 2 It is also certified to International Safety Standard EN 61010 and Electromagnetic Compatibility 89 336 EEC The VZS C 6963J2 series CMPA along with the VZL 6943J2 covering 1 0 2 5 GHz the VZM 6993J4 8 0 18 0 GHz cover the full 1 0 18 0 GHz in three CMPA units The J Series CMPA family is a member of acomprehensive line of communication amplifiers including TWT Low Power Ampli
9. an be con trolled and monitored via the front panel Principal functions are also brought to the five user interface connectors located on the rear panel for re mote monitor and control Control fault and monitor ing functions are available via the IEEE 488 GPIB port 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 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 Se ries CMPA Also an RS 232 serial port is provided for flash programming or control S C Band J Series CMPA VZS C 6963J2 04 00 Digitally controlled attenuation allows for RF drive attenuation adjustment via the serial remote and CIF interface ports thereby enhancing remote monitor and control capabilities To expedite field maintenance procedures the VZS C 6963J2 series CMPA utilizes a modular design ap proach 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 fault re porting and diagnostic procedures allow field person nel to localize the fault to the individual LRU make the necessary replacement and return the amplifier to ser vice with a minimum of operational downtime The overall amplifier enclosure
10. ct RF Power Setting Automatic Leveling Control ALC Attenuator Setting RF Inhibit RF Switch Port Relay Preferences Indicator Test Fault Reset Fault Settings CIF Port Setting Tests Time Date Settings RF Output Power Watts dBW or dBm Attenuator Setting RF Reflected Power Watts dBW or dBm Helix Current mA Helix Voltage kV Beam Current mA Heater Elapsed Time Meter Beam On Elapsed Time Meter Heater Time Delay HTD TX Transmit Select Standby Transmit Beam On Local Remote CIF ALC Time RF Inhibit w source TD 79 10 Remote Control Interface Cont Fault Alarm Display Fault Fault Log Low RF Fault and Alarm High RF Fault and Alarm High Reflected Power Interlocks Open power supply temp or amplifier cover Helix Over Current Helix Over Voltage Helix Under Voltage Power Supply Arc DC Buss Fault TWT Over Temperature Fault External Interlocks Fault Computer Serial and IEEE 488 Interfaces Control Functions TX Transmit Select Transmit Beam On Standby Beam Off RF Power Setting Automatic Leveling Control ALC Attenuator Setting RF Inhibit Fault Reset RF Alarm Fault Settings Monitoring RF Output Power Watts and dBW Attenuator Setting RF Reflected Power Watts and dBW Helix Current mA Helix Voltage kA Beam Current mA Heater Elapsed Time Meter Beam On Elapsed Time Meter Status Display Heater Time Delay HTD TX Transmit Select Standby Transmit Beam On Local Remo
11. d Maintenance Manual outline and interface draw ings Manufacturing Test Report and spare parts lists Outline and interface drawings provide dimensions and the location and size of mounting holes duct work and waveguide so that site preparations can be accom plished prior to receipt of the equipment The Service Manual provides instruction for unpacking and installation initial set up calibration normal op eration maintenance and repair of the equipment The manual includes schematic diagrams block diagrams and wiring information sufficient for use by maintenance personnel The Acceptance Test Report outlines the test per formed limits established Space is provided on the test report for recording and certifying the test results consolidating all related information in one document The spare parts documentation consists of a recom mended spare parts list to support the equipment for a one to two year period of operation A CSI Accep tance Test can be performed at customer s option which will repeat and verify results of selected perfor mance tests that were already recorded in the standard acceptance test 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 dem
12. eries CMPA VZS C 6963J2 04 00 ing wave tube The TWT helix and collector share the same transformer and regulator The collector operates at approximately 65 of the helix voltage A separate step down transformer with rectifier and filter network is employed to provide the heater voltage Control and Display Modules The microprocessor based monitor and control system is designed to assure proper operation of the power amplifier and easy maintainability with minimal operator training and activity The microprocessor based moni tor and control system includes three parts a main controller board an interface board and keyboard vacuum fluorescent display The system provides re quired operational sequencing and monitoring of criti cal parameters If a fault should occur the unit either recycles back to its state prior to the fault or latches into the FAULT state In either case the front panel display will provide fault information also the user can consult the Fault Log for time date stamped fault infor mation To make most software updates easier to install the J Series CMPA features Flash RAM based program instructions A flash RAM is amemory device with the two best characteristics of a disk drive non volatile memory and read write capability Software upgrades are easy to install in a Flash RAM based J Series CMPA because the upgrade consists of connecting a PC to the J Series CMPA then executing a PC pro gram In about
13. fiers 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 a recognized world leader in the field of microwave tube technology for over 50 years and has been active in the design and manufacture of a broad range 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 the existing CPI divisions involved with commercial Satcom and Industrial power amplifiers Today CPI Satcom Division has provided thousands of broadband power amplifiers and integrated satellite uplink power amplifiers in the L 5 Ku DBS and Ka band frequency ranges to worldwide users has become the leading supplier of this class of products Figure 1 S C Band J Series CMPA S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 1 INPU ISOLATOR 2 J2 11 3 gt IN 15 INPUT lt x CR2 L a72 18 gt A7J1 19 Figure 2 J Series CMPA RF Block Diagram S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 2 EQUIPMENT DESCR
14. ic function that can be monitored by sensors and fault indicators on a real time basis TD 79 6 PRODUCT SPECIFICATIONS The following specification limits and characteristics apply to the VZS C 6963J2 S C Band J Series CMPA unless otherwise specified Electrical Frequency Output Power eflange Bandwidth Instantaneous Gain eat rated power esmall signal RF Level Adjust Range Output Power Settability Gain Stability eat constant drive amp temperature temperature const dr any frequency Small Signal Gain Variation eacross the 6000 MHz band VSWR eInput Load VSWR efull spec compliance operation without damage continuous operation Residual AM ebelow 10 kHz 10 to 500 kHz eabove 500 kHz Phase Noise eIESS 308 309 phase noise profile Harmonic Output Noise and Spurious Noise Figure Primary Power S C Band J Series CMPA VZS C 6963J2 04 00 2 0 8 0 GHz 54 0 dBm min 250 Watts min 225 Watts min 6000 MHz 54 dB min 56 dB min 0 to 20 dB via electronic Attenuator 0 1 dB 0 25 dB 24 hr max after 30 min warm up 1 0 dB over oper temp range typical 12 dB pk pk typical 2 5 1 max 1 7 1 max with optional input isolator 2 5 1 typical 1 5 1 max any value 2 0 1 max at full power output higher at lower output powers due to soft fail protection feature 50 dBc 20 1 3 logF kHz dBc 85 dBc 3 dB 3 dBc typical at lower band edge
15. ing Status Display Fault Alarm Display S C Band J Series CMPA VZS C 6963J2 04 00 Main Power On Off TX Transmit Select Transmit Beam On Standby Beam Off Local Remote Computer CIF Select RF Power Setting Automatic Leveling Control ALC Attenuator Setting RF Inhibit RF Switch Port Relay Preferences Indicator Test Fault Reset Fault Settings Remote Port Settings Tests CIF Port Settings Tests Time date Settings Power Supply Test Mode RF Output Power Watts dBW or dBm Attenuator Setting RF Reflected Power Watts dBW or dBm RF Output Sample Port 50 dB nominal Type N female Helix Current mA Helix Voltage kV Beam Current mA Heater Elapsed Time Meter Beam On Elapsed Time Meter Power On Heater Time Delay HTD TX Transmit Select Standby Transmit Beam On Local Remote CIF ALC Time RF Inhibit w source Fault Fault Log Low RF Fault and Alarm High RF Fault and Alarm High Reflected Power Interlocks Open power supply temp or amplifier cover Helix Over Current TD 79 9 Front Panel Monitors and Controls Cont Remote Control Interface Control Functions Monitoring Status Display S C Band J Series CMPA VZS C 6963J2 04 00 Helix Over Voltage Helix Under Voltage Power Supply Arc DC Buss Fault TWT Over Temperature Fault Fault External Interlocks Fault TX Transmit Select Transmit Beam On Standby Beam Off Remote Computer CIF Sele
16. ion is available to reduce the input VSWR to the lowest possible level 115 VAC external step up transformer option This is used where 220 240 VAC input power is not available Also available in 250 W L Band TD 79 13 ACCESSORIES Several optional accessory items have been designed for use with the CPI 250 W S C band J Series CMPAs Brief descriptions of the items now available are given on the following paragraphs Redundant Switching The Switching System consists of an output 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 J Series CMPAs The circuit provides 1 1 redundant protection with automatic transfer or manual operation local or remote as se lected by the operator 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 combining system to coherently combine the output RF power of two J Series CMPAs The combined system then behaves as a single power amplifier with nearly twice the RF output power of a single J Series CMPA The combiner is a hybrid coupler which combines the two inputs with minimum loss The combiner assembly is normally supplied mounted in the rack cabinet which also houses the two J Series CMPAs to provide an integrated power combined J Series
17. measures approxi mately 19 w x 8 75 h x 26 d plus air duct adapters and weighs approximately 95 16 The 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 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 If included the optional input isolator limits the input VSWR to level 1 7 1 or less 1 5 1 typical back to the source The RF input is then routed to the SSIPA which includes an internal variable at tenuator The attenuator has a control range of a nomi nal 20 dB with quick response and excellent linearity The SSIPA is designed to be transparent to final ampli fier RF parameters As a result the overall J Series CMPA gain is specified to be stable within 0 25 dB 24 hours with 10 line voltage variations The output of the SSIPA is then fed to the input of the TWT The SSIPA and TWT provide a combined subsystem gain of at least 54 dB at rated power TD 79 3 The primary TWT employed in this power amplifier is the CPI VTG 6229S1 This TWT is an efficient de sign featuring conduction cooling and Periodic Perma nent Magnet PPM focused helix design The ou
18. ng and forward power metering The reflected RF fault sensor and the microprocessor based controller protects the TWT against excessive reflected power due to abnormal external load or an tenna conditions The power meter circuits measure and display continuous wave CW RF output An other RF metering feature is a forward low alarm The output power is compared with a user settable low RF set point an alarm is triggered should output power fall below this level Mechanical Design The VZS C 6963J2 series CMPA is packaged in a standard rack mounted drawer measuring 19 wide by 8 75 high and 26 deep plus connectors fan and air duct adapters The unit is cooled via an internal forced air cooling system consisting of one AC blower an air filter and an exhaust duct Allowances are made for 0 25 0 drop due to customer external ducting losses LRU Philosophy The J Series CMPA utilizes a modular design ap proach incorporating LRUs for ease of maintainability in the field The maintenance concept employed in the VZS C 6963J2 J Series CMPA is to localize a mal function 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 J Series CMPA LRUs as building blocks with a specif
19. onstrated on the equipment Small training groups up to five students assure the customer that each student has an opportunity to par ticipate fully in demonstration activities Courses may be conducted at the CPI factory or on site Course duration varies from several 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 such telephone consultation When called for however the service technicians are pre pared 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 S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 22
20. orts as well The standard RF output of the J Series CMPA is a female type N connector S C Band J Series CMPA VZS C 6963J2 04 00 Soft Fail Reflected Power Protection High reflected soft fail RF protection is a standard feature in the J Series CMPA This protects the tube from abnormal or transient load conditions which could permanently damage the TWT while assuring that the maximum RF output power is available without shut down during a crucial test sequence In operation this feature actively reduces the RF output to keep the reflected power below the reflected power trip point with a factory setting of 25W trip level reflect power will be limited to around 22W via the CMPA control ler by reducing RF gain Once the reflected power drops below 17W soft fail ends and normal operation is restored User settable low and high RF power alarms via the front panel are controlled via remote panel computer interface serial or IEEE 488 ports on the rear panel 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 IPA and auxiliary circuits for control monitoring and protection of the J Series CMPA Only the AC input power is required for operation The travelling wave tube derives its opera tion from three DC power supplies a filament heater low voltage supply a helix high voltage supply and a collector high voltage supply
21. tate 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 any normal operating state the following text will use TRANSMIT as an example the FAULT LED will light and the unit will switch from TRANSMIT to FAULT Two scenarios are possible The first scenario occurs when fewer than three faults occur within twenty seconds In this case the unit will recycle back to TRANSMIT Each fault will generate arecycle Each recycle from FAULT to TRANSMIT will be delayed by one second The second scenario occurs 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 CANCEL If the fault was successfully cleared the FAULT LED will extin guish and the unit will be in STANDBY Press TRANSMIT to resume transmitting In either case the time date stamped Fault Log will capture each fault event If multiple faults were de tected during one event they will be listed together This allows the able user or technician to identify indi vidual faults to a specific module or subassembly S C Band J Series CMPA VZS C 6963J2 04 00 RF Power Monitor Module The RF power monitor assembly receives signals from the forward and reflected power RF detectors for use in fault alarm sensi
22. te CIF ALC RF Inhibit w source S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 11 Computer Serial and 488 Interfaces Cont Fault Alarm Display Fault Low RF Fault and Alarm High RF Fault and Alarm High Reflected Power Interlocks Open power supply temp or amplifier cover Helix Over Current Helix Over Voltage Helix Under Voltage Power Supply Arc DC Buss Fault TWT Over temperature Fault External Interlocks Fault RF Switch Port Interface Features RF Inhibit Command Low RF Relay Fault Relay can be reassigned Sum Fault Relay External Interlock Interface Features External Interlocks Latching User Induced Fault External Interlocks Non Latching RF Inhibit S C Band J Series CMPA VZS C 6963J2 04 00 TD 79 12 Options amp Compatibility Features Options S C Band J Series CMPA VZS C 6963J2 04 00 Soft Fail Reflected Power Protection eAlpha numeric Menu driven 4 line display and front panel EN 61010 and EN60555 2 Safety Har monic standards as well as EEC 89 336 EMC standards Filament voltage reduction of 10 in standby 488 and RS422 485 4 wire computer interface standard eAuto Fault Recycle except for Power Supply Arc and External Interlocks eInternal test points for ease of maintenance lt 1 hr Forward power metering Electronic RF Attenuator standard Remote Control Panel Redundant and Power Combined Systems Input Isolator opt
23. the input 375 volt DC bus which is converted via a switch regulator and bridge circuit to anominal 200 volt 25 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 TWT 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 5V 5 isolated 16V 15V which are used to operate various internal circuit func tions 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 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 25 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 S C Band J S
24. tput coaxial cable connects the TWT output to the dual directional coupler DC1 The dual port direc tional coupler provides one reflected power port coupled via a detector to the RF power monitor as sembly for reverse power protection and a forward power port The forward power sample is split into two via a low power 10 dB coupler DC2 so that a 40 dB and 50 dB sample are available The 50 dB sample is cabled to a type N connector J9 on the front panel for the user to monitor forward RF power This RF sample port is calibrated in coupling ratio versus frequency and permits independent monitoring of J Series CMPA output power levels through the use of an external spectrum analyzer or portable power meter The 40 dB sample is isolated via DC block and further attenuated 30 dB by AT4 and then de tected by for the front panel forward power metering circuit A7 The reflected power port of DC1 is isolated by DC block FL2 then attenuated approxi mately 23 dB by and 5 and is then detected by CR2 The detected DC output is sent to RF monitor CCA A7 for monitoring of reflected RF power from the load back to the J Series CMPA Reflected power information 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 CIF port located on the rear panel RF drive is adjustable via these p
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