OPERATIONAL MANUAL SOLID STATE MODULATOR FOR THE BARON SERVICES RADAR X DD-250C WARNING INTERNAL VOLTAGES MAY. CAUSE SEVERE SHOCK OR DEATH; USE CAUTION AND AVOID CONTACT WITH ENERGIZED COMPONENTS BARON SERVICES; INC: 4930 Research Drive : Huntsville; AL 35805 PHONE: 256.881.
TABLE OF CONTENTS SECTION GENERAL DESCRIPTION Paragraph Title Nor 1-1 12 General Description +3 Requirements deo 3-11 3-12 3-13 3-14 245 3-16 8-17 Pops £0 RY ies Front: Panel Drawing Transmitter Outline Drawing SECTION 2 INSTALLATION INSTRUCTIONS introduction... Unpacking and Inspection. installation. Performance Check Out, SECTION 3 PRINCIPALS OF OPERATION Introduction... Learn Shyster Function Description. System Operation... 28 VDC and Alas Supply {A2) Filament Power Supply Assembly 0... Card Cage (Ad).
SECTIONS MAINTENANCE £1 Introduce 5-2 Periodic Maintenance. Inspection and. Cleaning... ox 5-4 Power and Pulse Width Output Check...
SECTION: 1 GENERAL DESCRIPTION 1-1 INTRODUCTION This: manual contains information and procedures for operation of the Solid State Modulator for Use in the Baron Transmitter Using the Marian SF D-373A Magneto. This manual is organized into three sections as follows! General Description Section 2. Preparation for Use Section 3... Principles of Operation Section 4. Operating Instructions Section 5.
Pulse Widths; {measured-at-3 dB power points): a. 04 hb. 1.00 c 2.00 Rise Time: equal colorless than 100 SEC: (measured between the 10 and 90% power points), Fai Time: Less than 200 SEC {measured between the 90 ang 10% power points): Output Requirements: Stability: 0:4:dB, Pulse to Pulse Spectrum Side jibes greater than 12.08 down NOTE: The modulator will be capable of delivering the correct pulse stability and power to permit the necessary RF source performance.
Filaments: Standby! 9.5 volts, 3.6 amps. Operate: Down to “07 vats at full duty Trip Trigger: 1010 15 Not Rove! signal with a pulse Wight [4 luge 12 user via BNC connector to 50 ohm load Output Connections: The Magneto shall be: connected directly to the Pulse Transformer using the 61-inch long leads provided with the strongman: HIPS Regulation: The output. voltage. regulation .over.. the... Modulator duty. cycle range to .0011 shall be better than 1.0 percent. Output ripple shall be fess than 0.
TABLE 1-1 CONTROL INPUT/OUTPUT LINES/CONNECTOR TYPE INPUT CONNECTOR FOR SINGLE PHASE 208VAC = MS3112E16-8P {J1) PIN A ~ PHASE A PIN.
PICNICKING PIPPIN BUS RETURN/BUS COMMON RETURN VOR VCC IN, COMMON FOR COMMANDS PIN 14 AXON ACTIVE HIGH, 10-28V INPUT, TORPOR-ISOLATED PIN 15 = NIC NOTE: THE COMMAND AND STATUS SIGNALS ARE ISOLATED FROM THE TRANSMITTER GROUND THE STATUS SIGNAL (SUMMARY FAULT AND FILAMENT READY) OP TO-COUPLERS ARE POWERED 8Y THE EXTERNAL BUSS VCC VOLTAGE, WHICH SHOULD BE +10-15VDC {20V MAX). THE POWER RETURN 1S BUS RETURN/BUS COMMON, WHICH 1S ISOLATED FROM THE TRANSMITTER GROUND.
Lo SECTION 2 PREPARATION FOR USE unpacking, inspection and installation instructions for a Solid State Modulator/ Transmitter, 2:2; UNPIN INSPECTION This ASSEMBLY is shipped in one. container, carefully open the container and remove the Modulator assembly. Visually inspect Modulator for damage that may have occurred during shipment. Check for evidence of water damage.
wr 2:4 softhearted magneto and dummy load is installed. Refer ta paragraph 2:4; rin minimum performance tests to ensure that the Transmitter meets performance standards. installation Performance Check Out: . Insure Dummy Load is connected to transmitter RF Output Port. . Place unit into standby operation. External trigger Pulse Train should be set for 1 use PW. at 500. Hz PR. Modulator is awaiting 5-minute time out: . Verify Filament Voltmeter indicates approximately 9.5V. .
SECTION 3 PRINCIPLES OF OPERATION 3-1 INTRODUCTION This section contains a functional description of the Solid State Transmitter. A glossary of interface signals is provided in Table 1-1, page 1-4. Other sections give functional descriptions of the assemblies that make up the Transmitter Group. The schematics for each of the assemblies can be found in the front of the manual. This Transmitter employs a Marian SF D-373A pulsed magneto. The unable magneto operates in the frequency band GHz.
When the magneto starts pulsed operation, the peak current is sensed and converted to an average current for scheduling the filaments voltages for proper magneto operation. As the duty cycle is increased, the filament voltage is reduced. This type of scheduling allows the transmitter 10 be operated at different duty cycles without concern for damage to the magneto.
ak The Card Cage houses the following” plug-in* circuit card assemblies (YUCCA: » Master Regulator CCA (ARAB) » Control Conditioner CCA (A4A4) » Interface and Control CCA (A4A5) » Extender Board (A4A3} The LIPS CCA (A4A2) is mounted onto the left side of the Card Cage and the Standby P/S, LV Monitor and Relay CCA {A4A1) is mounted onto the back of the Card Cage 3-7 MASTER REGULATOR CONTROL CCA (A4A6) The DC-DC Converter is configured as a current mode buck regulator with a push-pull inverter output.
7. Filament warm-up time delay when the AC voltage is first applied. 8. Fault logic used to protect the transmitter. The interface and Control CCA has three adjustments which are as follows: + High Voltage «Maximum Magneto Current (Fault Threshold) » Filament Program Slope The CCA also has a three-position test switch that allows: 1. ‘TEST --The modulator LGBT gate drive to be enabled without having to wait for the filaments to time-out. This is an aid in troubleshooting. 2.
3-12 DC -QT-DC CONVERTER (A5) The DC-to-DC Converter Is the line/load regulator and receives the unregulated 270 VDC output from the rectification. CAUTION: The 270 VDC is not referenced to ground. The DC-to DC-Converter contains a Buck regulator and a push-pull inverter that provide the step-up in output voltage and the necessary isolation between the primary AC input lines and the rest of the system.
3-16 EVER-TEMPERATURE PROTECTION The Transmitter contains two thermostats: one mounted on the DC/DC Heat sink and one mounted on the Modulator Assembly Heat sink. The thermostat contacts are normally closed, and open when the transmitter internal operating temperature exceeds 95 degrees C. When an over-temperature occurs, one or more of the thermostats will open and generate a fault signal on the Fault Interface CCA, A4-A5. When an over temperature fault occurs, the logic disables on the Irradiate command.
SECTION 4 OPERATING INSTRUCTIONS This section contains operating instructions of the Solid State Modulator using a “C* Band, SF D-373A, 250 kw Magneto. The Transmitter has a control panel for local operation and an I/O interface “or remote control by a host system. . 4-2. CONTROLS AND INDICATORS The location and function of all controls and indicators on the Modulator assembly are shown in figure 4-1 and are described in table 4-1. TABLE 4-1.
Sar TRANSMITTER POWER FAULT {Indicator, DS3} STANDBY {Indicator, DS4} MAGNETO AVERAGE CURRENT (indicator, M5) HV RADIATE (indicator, DS5) indicates the transmitter AC voltage is ‘ON and the transmitter is in Standby awaiting time-out. The nominal indication is 230VAC. indicates one or more faults exist. The fault(s) will be indicated on the Control/Conditioner CCA (A4A4) and interface Control CCA (A4A5) by edge-mounted LED.
RED LED: Indicate one or more of the voltages are under taro D§10) voltage. MAGNETO PEAK RED LED: Indicates the peak current has exceeded 33 CURRENT (Indicator, amps for two pulses in a row, pss) (THIS FAULT IS LATCHED) CONNECTORS: TB3 MAIN POWER pore Terminal Block. Receives 230 VAC and output oad. J2 Interface Connector J3 Command Pulse WAVE GUIDE QR-187 Wave guide flange. Will have a gasket and FLANGE protective cover for shipping and storage. 4.
NOTE: THE TRANSMITTER WARM-UP CYCLE TAKES APPROXIMATELY 5 MINUTES. WHEN THE WARM-UP CYCLE IS COMPLETE, THE FILAMENT/READY INDICATOR WILL BELT. 6. Set OFF/SAFE/RADIATE switch to IRRADIATE position and observe the magneto average current. The Average current meter will indicate the average RF. Power.
SECTION 5 MAINTENANCE 5-1 INTRODUCTION This section contains periodic maintenance, test and trouble analysis procedures for the Solid State Transmitter. {t also contains a description of test equipment required to perform the identified tasks. 5-2. PERIODIC MAINTENANCE Periodic Maintenance requirements and the intervals at which the tasks should be performed are listed in Table 5-1. CAUTION WEAR PROPER EYE PROTECTION TO AVOID EYE INJURY WHEN USING COMPRESSED AIR.
5-3. INSPECTION AND CLEANING Inspection and cleaning should be performed every six (6) months. If the transmitter is operated in a severe dust environment, perform inspection and cleaning more often. MAKE SURE THE CIRCUIT BREAKER IS OFF AND THE OFF/SAFE/HV RADIATE SWITCH IS IN THE SAFE POSITION. Remove covers as necessary so cooling fans and interior of transmitter can be inspected for dirt and dust. Inspect and if necessary, clean the fan blades.
5-5 REMOVAL OF MODULES Procedure #1 — Standby Power Supply Low voltage Monitor {Removal 1. Remove 4 mounting screws on A2. 2. Loosen 3 captive screws on A2J1. Procedure #2 —DC-DC Converter AS (Removal) 1. Loosen 2 captive screws on assembly's J1. 2. Remove 4 mounting screws from underside of drawer. 3. Disconnect blank and white output cables from TB2. Procedure #3 — Modulator Assembly A6 Removal Remove 4 mounting screws underneath shelf. Disconnect black and white high voltage cables.
Ma CAUTION: Be sure to tighten the magneto plate screws or the contact resistance to ground for the magneto can cause problems 1. Connect the magneto return braid with 2 screws. 2. Connect P1 and P2 to the oil can.