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Magnetron Transmitters: 3475 Series

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Magnetron Transmitters: 3475 Series Beverly Microwave Division 150 Sohier Road • Beverly, MA USA 01915 +1(978) 922-6000 • [email protected] www.cpii.com/BMD Magnetron Transmitter 3475 Series Features: • Up to 400 kW peak power • Compatible with multiple magnetrons • VSWR protection • Modular design for ease of customization • Touch screen local control with Ethernet connectivity for remote control and monitoring • Air cooled Benefits: • CPI BMD Magnetrons and modulators ensure compatible performance • Transmitter is compatible with magnetrons at various power levels and frequencies • Easy to use and user friendly • Built in diagnostics and BIT for local or remote Applications: troubleshooting. • Instrumentation radar • Weather radar • EMI / EMC field testing The VPW3475 magnetron transmitter is developed as The transmitter cabinet contains the high voltage power a fully integrated magnetron system operating up to supply, magnetron, solid state switch, and the high 400 kW peak power. This microwave transmitter uses a voltage tank assembly which includes the pulse trans- CPI coaxial magnetron as its RF output device. The former, energy storage high voltage capacitor, and frequency of operation is magnetron dependent. Any filament power supply and control system for local or CPI magnetron with RF power range up to 400 kW can remote operation. CPI provides a complete cabinet with be used in this transmitter. CPI provides any modifica- a touch screen controller and dual-directional coupler tions required for the particular magnetron chosen. CPI which is part of the CPI control system for monitoring is able to furnish a compact, user-friendly, microwave forward and reflected power. Depending on the options power source which is also cost effective. selected CPI can also provide RF isolators and servo-tuners for the magnetron if desired. •• SolidSolid StateState Power AmplifiersAmplifiers • •Integrated Integrated Microwave Microwave Assemblies Assemblies •• ReceiverReceiver ProtectorsProtectors •• ControlControl Components Components • •Transmitters Transmitters • Amplifiers • Amplifiers •• ModulatorsModulators •• MagnetronsMagnetrons • •Crossed Crossed Field Field Amplifiers Amplifiers •• RingRing Loop TravelingTraveling Wave Wave Tubes Tubes • •Power Power Couplers Couplers Beverly Microwave Division www.cpii.com/BMD Magnetron Transmitter - 3475 Series The high voltage power supply is a 19 inch tray inside Instrumentation and Control the cabinet. It is completely self-protected with over current and input under/over voltage circuits. The Front Panel Control and Display filament power supply needed to operate the magnetron The magnetron transmitter has a touch screen computer is contained in this unit. All external interface and control control system that accepts control inputs and provides is done in this supply. Cooling is accomplished by inter- status, fault/alarm conditions, and metered parameter nal fans. information. This information is available on the front panel screen of the transmitter and also via an Ethernet Cathode pulsing is done by a completely solid-state connector. The table on page 3 defines the specific array of IGBT switch boards that is driven by the control control functions, monitored test points on the front interface board in the high voltage power supply. This panel, transmitter operating status, fault/alarm condi- switch inherently limits current and pulse energy by tions, and metered voltages, currents, and operating design, no external circuitry is required for these func- times. tions. The IGBT switch is also a current controlled switch, set by a bias voltage from the high voltage power The front panel consists of the touch screen that allows supply control interface board. The voltage across the for individual controls and as well for operation remotely switch will automatically change as the voltage across through the Ethernet connection. Analog test points are the magnetron changes due to frequency and tempera- available for diagnostic and performance assessment on ture changes. Shifting from magnetron to magnetron the rear panel. These test points are buffered to allow only requires an adjustment of the drive voltage. This the use of standard test equipment such as oscillo- switch will inherently limit arc current in the event of a scopes, RF spectrum analyzers, and RF power meters. magnetron HV arc. The limit is less than twice the normal operating current in the event of a complete short The remote interface utilizes an Ethernet IP address with circuit. The switch assembly has internal fans to cool the CPI standard protocol and command set. All the front switches. panel information and functions that are available on the control panel are also available via the remote interface. All high voltage is contained in a sealed tank. The pulse In order for the transmitter to be remotely operated, the transformer that steps up the high voltage power supply Front Panel local/remote switch must be commanded to output to the required magnetron voltage, the storage remote. The analog test points are not remotely avail- capacitor bank to supply the energy during the pulse, able. and the magnetron filament connections are all contained in this tank. The magnetrons are mounted at the top of the enclosure for easy access. A fan is provid- ed to cool the magnetron. Options: • A servo-amplifier can be supplied to provide frequency control using computer commands. • An RF isolator or circulator can be provided for VSWR protection The values listed above represent specified limits for the product and are subject to change. The data should be used for basic information only. Formal, controlled specifications may be obtained from CPI for use in equipment design. For information on this and other CPI products visit our webpage at www.cpii.com/BMD, or contact: pg.2 CPI Beverly Microwave Division, +1 (978) 922-6000 • FAX: +1(978) 922-8914 • [email protected] Rev. 8/19 Beverly Microwave Division www.cpii.com/BMD Magnetron Transmitter - 3475 Series Pulsed operation and timing are derived from an exter- Fault Display nally supplied modulator gate signal. This gate will • Fault sum determine the duration of the output RF and pulse repeti- • Interlocks open (external or cover) tion frequency (PRF). Internal monitoring circuits will • Magnetron average over current ensure that the acceptable pulse width, PRF, and duty • Magnetron peak over current cycle limits of the transmitter are not exceeded. This • High voltage low modulator gate signal is not part of the serial interface • High voltage current high and must be supplied separately via a dedicated low • Filament voltage impedance driver. • Filament current • Over temperature With the servo-amplifier option, the operating frequency • Low voltage power supply of the magnetron is controlled by an analog voltage • Drive power supply applied to the servo amplifier. The voltage is scaled to • Duty cycle high be +/-5 V for full band deflection and will achieve the • Fault log whole band tuning in 10 cycles per second. The • Tuner fault frequency tuning accuracy and / or step size depends on • Servo fault (option) the frequency and bandwidth and can be step tuned or swept tuned across the band. Front Panel Monitoring Fault Protection • Magnetron pulse current (0.1 V/A) • Trigger sample Remove pulses for: Display Monitoring • Beam over current • Filament fault • Power on • Over duty • Heater time delay • High voltage power supply faults • Standby • Low voltage power supply under voltage fault • Transmit (RF On) • Over temperature • Local/remote • External Interlock • Beam elapsed hour meter • Heater elapsed hour meter Control Functions • Magnetron average current • High voltage • Main power On/Off (front panel circuit breaker) • High voltage power supply current • Transmit/standby (RF On/Off) • Filament voltage • Fault reset • Filament current • Local / remote select The values listed above represent specified limits for the product and are subject to change. The data should be used for basic information only. Formal, controlled specifications may be obtained from CPI for use in equipment design. For information on this and other CPI products visit our webpage at www.cpii.com/BMD, or contact: pg.3 CPI Beverly Microwave Division, +1(978) 922-6000 • FAX: +1 (978) 922-8914 • [email protected] Rev. 8/19 Beverly Microwave Division www.cpii.com/BMD Magnetron Transmitter - 3475 Series Ethernet Control Signals Description Comments Control Inputs Filament power on Available at touch screen and remotely Radiate Available at touch screen and remotely Input Gate +5 V into 50 ohms, variable width Reset Available at touch screen and remotely Control Adjustments Peak current adjust Available at touch screen and remotely Frequency adjust Front panel inputs Status Outputs Available at touch screen and remotely LVPS fault LVPS < 80% nominal HVPS fault HVPS < 80% nominal Filament PS fault Out of regulation Magnetron over current Avg. current > 50 mA, peak current > 50 A Over duty Duty over 0.001 Over-temp. Excess temperature Interlock Open interlock Meter Outputs Pulse avg. current Available at touch screen and remotely HVPS voltage Mod. avg. current Filament voltage Filament current Filament hours Radiate hours Internal temperature Electrical Parameters Mechanical and Environmental Parameters 1 GHz to 35.5 GHz Ambient Temperature -10 C to +50 C operating Frequency Range º º magnetron dependent Ground benign (typical Shock and Vibration transportation) RF Output Up to 400 kW (max.) Cooling Air cooled Duty Cycle 0.001
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