Baron Services XDD-250C C-Band Doppler Weather Radar User Manual Image4

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Document Description	Operational Manual XDD 250C
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Date Submitted	2000-12-04 00:00:00
Date Available	2001-03-29 00:00:00
Creation Date	2000-12-01 12:20:48
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Document Author:	telecom

OPERATIONAL MANUAL
SOLID STATE
MODULATOR
FOR THE
BARON SERVICES
RADAR
XDD-250C
WARNING
INTERNAL VOLTAGES MAY CAUSE SEVERE SHOCK
OR DEATH; USE CAUTION AND AVOID CONTACT
WITH ENERGIZED COMPONENTS
BARON SERVICES, INC.
N 4930 Research Drive
Huntsville, AL 35805
PHONE: 256.881.8811 FAX: 356.881.8283
TABLE OF CONTENTS
SECTION 1
WE
Paragraph Title
No.
1-1 introduction.
1—2 General Description“
‘lv3 Requirements
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Front Panel Dravlnng... .
Transmitter Outline Drawing
SECTION 2
INSTALLATION INSTRUCTIONS
Introduction....,.,r...r.
Unpacklng and lnspection.
tnstaliatiunum
Performance Check Out
SECTION 3
PRINCIPALS OF OPERATION
Introduction.
System Function Descrlptlon
System Operation .
28 VDC and Bias Supply (A2)
Filament Power Supply Assembly (A3) ..........
Card Cage (A4) ,
Master Regulator on rol CCA (A4A6).
Control Condmoner CCA (A4A4)...
Interlace and Control CCA (A4A5)
Low Voltage Power supply CCA (A4A2
Low Voltage Monitor (A4A1
DC to DC Convener (A5)
Modulator Assemblies (A6).
on Can Assembly (ABAZ)
Reset Assembly (A7),..
Over Temperature Protection
Magnetron Assembly (V1) .....
» » SECTION 4
OPERATING INSTRUCTIOIE
introduction.
Controls/Indicators
Operating Procedures.
5-1
5-2
5-3
5-4
55
SECTION 5
NTENANCE
introduction ............
Periodic Maintenance
Inspection and Cleaning
Power and Pulse Width Output Check...
Maintenance Procedure for Removal
Of Modules For Replacement And/Or
Trouble Shooting
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 Varian SFD-373A Magnetron,
This manual is organized into three sections as follows:
Sectionl. Introduction and General Description
Section 2 Preparation for Use
Section 3. Principles of Operation
Section 4. Operating instmctions
Section 5. Maintenance
1-2 GENERAL DESCRIPTlON
A Solid State Modulator, figure 1—1, The Solid State Modulator in essence is a Hard Tube
Modulator which uses low voltage IGBT switches and pulse transformers to drive Varian
SFD-373A Magnetron at the proper operating voltage of 25 W. The Varian SFD-373A
coaxial magnetron will generate high-power microwave RF pulse energy in the frequency
range of 5.4 to 5.7 GHZ with a peak power output of a minimum of 250 kilowatt. It is driven
by a Solid State Modulator, which will drive the magnetron with proper pulse widths and at
a repetition frequency as directed by the external pulse groups. The duty cycle for the
transmitter is limited to 0.0011 as dictated by the magnetron specification. Protective
circuitry will protect the magnetron by not allowing RF. pulses to be generated at a
combination of pulse width and rep rate not to exceed the .0011 duty cycle, The
magnetrons output frequency is adjusted manually.
Primary power is 220VAC, 50 Hz, 1 phase and is connected to the Transmitter through
connector TB3. The remote control signals from the host system are on connectors J2 and
J3. Internal fans provide cooling for the emitter by circulating cooling air over plenums and
heatsinks
1-3 REQUIREMENTS
TRANSMITTER SPECIFICIATON:
Magnetron: Varian SFD-373A or equivalenl ---5.4 to 5.7 GHZ
Magnetron Input: 25 kV, 25 amps (Nominal)
Peak RF Power: 250 kw
l—l
Pulse WldthSZ (measured at —3 08 power points):
a. 04
2). 1,00
c. 2.00
Rise Time: equal to or less than 100 NSEC
(measured between the 10 and 90% power points)
Fall Time' Less than 200 NSEC
(measured between the 90 and 10% power paints):
Qutput Reguirements;
Stability 0.1 dB. Pulse to Pulse
Spectrum: Side lobes greater than 12 us down
NOTE The modulator will be capable of deliverlng the correct pulse
stability and power to permit the necessary RF source
performance. Maximum duty cycle will be limited by modulator
circuitry.
Output Pulse Variation: Less than 1% at any combination PRF, Pulse Width
and Pulse Code
is ,,,,, , Jitter. Less than 3 NSEC. RMS (Referenced to input Trigger)
Delay Stability: Less than .1 user: after warm-up (One-half hour)
Duty Cycle: MAGNETRON IS .00‘l1
NOTE: The modulators will employ magnetron “over
duty" protection. The transmitter will >drog pulses
when the duty cycle is exceeded, thus maintainintlthg
maximum dug cycle. A fault light will alert the
operator of the over cycle.
Modulator Output‘ Output to the magnetron will approximate 250 kilowatts.
Output Pulse Amplitude (Negative Pulse) shall be adjustable to a
preset value between 22 to 26KV. A softstart build up of the
operating voltage to the magnetron is preset and this shall occur
during the first ten seconds after transmitter HV turn-on. Typical
operating conditions require a pulse 0125 KV at 26 amperes.
W)
Filaments:
lnput Trigger:
Output Connections:
HVPS Regulation:
Altitude:
Operating.
Ambient Temperature:
Humidity:
Cooling:
Dimensions:
Height... 19.25mches
Width... 16.00 inches
Depth,.., 27.25 inches
Transmitter Weight:
Standby: 9.5 volts, 36 amps
Operate: Down to “0' volts at full duty
10 to 15 volts level signal with a pulse width of .4 usec to 2
usec via BNC connector to 50 ohm load
The Magnetron shall be connected directly to the Pulse
Transformer using the 6 -inch long leads prowded with the
magnetron.
The output voltage regulation over the Modulator duty
cycle range to .0011 shall be better than 1.0 percent.
Output ripple shall be less than 0.1 percent. and recovery
from a 50 percent transient spike on the load shall not be
greater than 3 milliseconds.
OTHER CONSIDERATlo
To 10,000 Feet
-40C to +55 degrees C
95%. non-condensing
Internal, forced air
90 pounds with Magnetron
1-3
LEM
CONTROL INPUT/OUTPUT LINES/CONNECTOR TYPE
INPUT CONNECTOR FOR SINGLE PHASE 208VAC ~ M83112E16-8P (J1)
PIN A — PHASE A
PIN H — NEUTRAL
PIN G A GROUND
CONNECTOR U6291B (BNC) (J3) — COMMAND PULSE
0-1OV LOGIC PULSE INPUT FOR MODULATION
INTERFACE CONNECTION M24308/3-2F (JZ)
PIN 1 -— RESET COMMAND
ACTIVE HIGH, 10-28V INPUT, OPTO-ISOLATED
PIN 2 — SUMMARY FAULT
ACTIVE HIGH, IO-15V TOTEMPOLE OUTPUT (VCC), OPTO-ISOLATED
PIN 3 — BUSS VCC
10-15VDC TO POWER THE OPTO-COUPLERS
PIN 4 — FILAMENT VOLTMETER (15Volts, Full Scale)
0-1 MA CURRENT OUTPUT FOR METER MOVMENT, INDICATORING FILAMENT
VOLAGE
PIN 5 — HV POWER SUPPLY CURRENT METER (1.0 Amps, Full Scale)
0~1MA CURRENT OUTPUT FOR METER MOVEMENT, INDICATING
MODULATOR CURRENT
PIN 6 — HV POWER SUPPLY VOLTAGE METER (2000 VOLTS, Full Scale)
O~IMA CURRENT OUTPUT FOR METER MOVEMENT, INDICATING OUTPUT
VOLTAGE
PIN 7 — MAGNETRON CURRENT METER (50 ma, FuII Scale)
0-1MA CURRENT OUTPUT FOR METER MOVEMENT, INDICATING AVERAGE
MAGNETRON CURRENT
PIN 8 — GROUND
RETURN FOR METER CIRCUITS, TRANSMITTER GROUND.
PIN 9 — HV ON/RADIATE COMMAND
ACTIVE HIGH, 10-28V INPUT. OPTO-ISOLATED
PIN 10 — FILAMENT READY
ACTIVE HIGH, 10-15V TOTEMPOLE OUTPUT (VCC)I OPTO~ISOLATED,
INDICATING FILAMENT WARM-UP DELAY IS COMPLETED
FIN 11 -— MAGNETRON AIR FLOW
SWITCH CONTACT TO GROUND INDICATING MAGNETRON COOLING AIR
FLOW
FIN 12 — N/C
FIN 13 - BUS RETURN/BUS COMMON
RETURN VOR VCC IN, COMMON FOR COMMANDS
PIN 14 — AC ON
ACTIVE HIGH, 10-28V INPUT, OPTO-ISOLATED
PIN 15 - NIC
NOTE: THE COMMAND AND STATUS SIGNALS ARE ISOLATED FROM THE
TRANSMITTER GROUND BY OPTO-COUPLERS. THE STATUS SIGNAL
(SUMMARY FAULT AND FILAMENT READY) OPTO-COUPLERS ARE POWERED
BY THE EXTERNAL BUSS VCC VOLTAGE, WHICH SHOULD BE 1-10-1 5VDC (20V
MAX). THE POWER RETURN IS BUS RETURN/BUS COMMON, WHICH IS
ISOLATED FROM THE TRANSMITTER GROUND.
Thgfront Panel has the following meters:
FILAMENT VOLTMETER — 15 VOLTS FULL SCALE
HV POWER SUPPLY CURRENT METER ~1l0 AMPS FULL SCALE
HV POWER SUPPLY VOLTAGE METER — 2000 VOLTS FULL SCALE
MAGNETRON CURRENT METER v 50 MA FULL SCALE
AC INPUT VOLTS — 220VAC —- SYSTEM POWER
AC INPUTS VOLTS — 220VAC — TRANSMITTER POWER
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SECTION 2
PREPARATION FOR USE
1-1 rumor
This section contains unpacking, inspection and installation instructions for a Solid State
Modulator/Transmitter.
2-2. LLNPACKING AND INSPECITON
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. bent or warped chassts, loose
screws or nuts, or extraneous packing material in connectors or air vents. Inspect all
connectors for bent connector pins. Inspect all connectors on the card cage to be sure that
the PCBs are properly seated and securely connected. After inspection, the Varian SFD~
373A Magnetron is ready for MOUNTING TO MODULATOR. Transmitter should be tested
with dummy load grior to Radiating form Antenna.
CAUTION
Exercise care in handling equipment during inspection to
grevent damage due to rough or careless handling;
2-34 INSTALLATION
The Transmitter assembly is designed for mounting on a flat stationary surface. Internal
fans provide cooling for the Transmitter. Be sure when mounting into enclosure that
enough cooling air is allowed from the intakes and also provisions are made for exhausting
hot air.
T0 INSTALL THE TRANSMITTER, PROCEED AS FOLLOWS:
. Install Transmitter and secure with (6) - 6/32 mounting bolts where indicated by
the configuration drawing.
NOTE
Be sure that the Transmitter is mounted close enough to the host equipment
to prevent stress on the interconnecting cables
- Refer to figure 2-1 for location of Transmitter connectors and connect to power
lines and host console with interconnecting cables.
2-4
. After the magnetron and dummy load is installed. Refer to paragraph 2.4, run
minimum performance tests to ensure that the Transmitter meets performance
standards.
Installation Performance Check Out:
1 Insure Dummy Load is connected to transmitter RF Output Port.
2. Place unit into standby operation. External trigger Pulse Train should be set for 1
usec PW at 500 Hz PRF. Modulator is awaiting 5-minute time out.
3. Verify Filament Voltmeter indicates approximately 9.5V.
4. After time out switch unit into radiate. Verify power supply meter ramps up to
approximately 1200V and power supply current meter and magi average current
meter have an indication.
5. While monitoring detected RF on oscilloscope change external settings PW to 2.0
usec and PRF to 250 FPS. Verify waveform is to specification and flat across the
Log. If not, adjust CCA A4A5 R2 for a flat response.
6. If all tests have passed, shut down transmitter and remove dummy load. Connect
transmitter RF output port to the antenna waveguide system
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.
3-2. SYSTEM FUNCTIONAL DESCRIPTION
This Transmitter employs a Varian SFD-373A pulsed magnetron. The tunable magnetron
operates in the frequency band of 5.4 to 5.7 GHZ. The magnetron output frequency is set
by manual control. The magnetron will generate peak RF power of 250 Kilowatts Peak.
Besides the magnetron, the Transmitter has the following Sub»Assemines.
1. Rectifier Filter (A1) BA15000
2. 28vdc and Bias P.S, (A2) RCZOO3
3. Filament P.S. (A3) RC4000
4. Card Cage Assy (A4) RC7000
4.1 CCA Control Conditioner (A4—A4) TT21000
42 CCA Interface & Control (A4-A5) RC2004
43 CCA Master Regulator (Aft-A6) FP01 104
4.4 Low Voltage Monitor (A4-A1) RC2002
4.5 Low Voltage PS. (A4-A2) TT10600
4.6 Extender Board (A4-A3) Tl'20200
5. DC-DC PS. (A5) RC3000
6. Modulator Assy (A6) EBA-16000
6.1 iGBT Assy (AB-A3) RCSSOO
6.2 IGBT Driver (AG—A1) TT10210
6.3 Oil Can Assy (AS-A2) BA16500
7. Reset Circuit (A7) BA 17000
An external pulse train supplied by the host system controls the RF output pulse width and
PRF. The transmitter is designed to operate at a pulse or pulse code repetition frequency
(PRF) of 250 to 1200 Hz, Pulse Widths of .4, 1.0, and 2.0 usec and limited to a maximum
duty cycle of .001 and 1200 PPS.
Internal fans provide cooling for the Transmitter.
3-3 SYSTEM OPERATION
When the Power. circuit breaker is On and Standby is selected, filament voltage is applied to
the magnetron by an AC (3.8 kHz nominal) square wave, isolated from the high voltage pulse
by a specially designed transformer. After a warm-up period of 5 minutes. the Transmitter
will indicate Filament Ready and will switch to the HV/Radiate mode if it has been selected.
The magnetron will operate at the PRF and pulse width as received by external trigger.
3-1
is”?
When the magnetron starts pulsed operation, the peak current is sensed and converted to an
average current for scheduling the filaments voltages for proper magnetron operation. As the
duty cycle is increased, the filament voltage is reduced. This type of scheduling allows the
transmitter to be operated at different duty cycles without concern for damage to the
magnetron, The Interface & Control Card monitors the average operating current of the
magnetron(
A4A5).
The primary 220 VAC is rectified and filtered to an unregulated voltage of 270V DC. The
unregulated 270 VDC is boosted and regulated to a nominal voltage of 1240 volts by the DC»
DC Converter (A5). The HVPS remains off until warm-up is complete and the HV/Radiate
mode is manually selected by the operator in concert with the selected repetition rate and
pulse width. The high voltage is then ramped to the proper preset operating point in a period
of 10 seconds. Master regulator circuit card assembly A4A6 maintains the DC voltage at a
prescribed level by pulse width modulating the DC/DC converters drive pulses. it is
advantageous to ramp the DC voltage, which in turn slowly increases the peak current to the
magnetron. This enhances the magnetron reliability and also helps burn out any gases that
may have built up if the magnetron has not been used for a period of time. Ramping the
voltage allows the magnetron to be turned on at its minimum operating current and slowly
increased to the peak operating current.
The external generated pulse is processed and amplified by the control/conditioner CCA
(A4A4) then fed to the lGBT Driver/Modulator assembly (A6). The Control/Conditioner
monitors the input pulse train. to keep the magnetron duty cycle from exceeding its limit of
0.001. When the duty cycle is exceeded, the circuitry on (A4-A5) drops out pulses to
maintain the duty cycle at 0.001.
When the IGBTs are driven on they apply a nominal 1220~volt pulse to the primary of the
pulse transformer. The secondary of the pulse transformer applies a nominal operating
voltage of 25,000 volts to the magnetron at the specified rate of rise of voltage to assure its
proper operation.
3-4 28 VDC AND BIAS POWER SUPPLY CCA (A2)
This chassis mounted assembly contains two DC—DC converters that are powered by the
unregulated 270 VDC. The 28 VDC converter is used to drive the programmed filament
power supply A6 and LVPS A5. The 3.3 VDC Bias converter supplies reset current via A7
and L1 to the pulse transformers in the Oil Can Assembly A6-A2.
3-5 FILAMENT POWER SUPPLY ASSEMBLY (A3)
The power supply pass and switching transistors are mounted through a heat sink to the
CCA. The assembly has a small fan to help dissipate the 50 watts of loss. The power
supply, comprising a linear regulator and a push-pull transformer driver, is controlled by the
lnterface and Control and Monitor CCA A4A5, The Filament transformer is located in the Oil
Can Assembly A6A2. The transformer driver operates at 3.8 KHz and is current limited. The
filament transformer output is 1375 VAC rms.
3-2
3-6 CARD CAGE (A41
The Card Cage houses the following’ plug-W circuit card assemblies (CCA):
- Master Regulator CCA (A4A6)
- Control Conditioner CCA (A4A4)
- Interface and Control CCA (A4A5)
- Extender Board (A4A3)
The LVPS 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 (A4A§)
The DC—DC Converter is configured as a current mode buck regulator with a push~pull
inverter output A pair of Pulse Width Modulator (PWM) le generates the regulator and
inverter FET gate drive pulses. Circuitry monitors the output current for a fault condition and
produces outputs for the panel meterr
3-8 CONTROL CONDITIONER CCA {A4A41
The command pulse is monitored by the duty cycle limiter circuit. The circuit is an integrating
limiter. When the voltage on the capacitor is charged to the comparator limit, the pulses are
inhibited for approximately 28 ms, which can limit pulse widths as well as drop whole pulses.
The duty cycle limit is set to 0011 to guarantee operation at .0010, Because there is a finite
rise time and magnetron turn—on delay, the generated pulse must be stretched to obtain the
proper RF pulse width. The compensation circuit adds approximately 300 ns to the pulse
width, The output buffer amplifiers drive the shielded lines that go to the lGBT Driver CCA
(A6A1). The Mod Pulse turns on the main IBGTs, and the End Pulse, which is generated by
the trailing edge of the Mod Pulse, helps turn off the main lGBT.
The CCA has a Test switch that can be used to disable the lGBT qate drive pulses while the
high voltage is on or be used to enable the pulses without the lligh voltage being on. An LED
on the CCA indicates if the switch is not in the Normal position.
3-9 INTERFACE AND CONTROL CCA iA4ASi
The Interface and Control CCA performs eight functions:
1. Isolation of the external control and status signals form the Transmitter to ground.
o This is accomplished by using optocouplers.
2. Generation of the 10-second ramp that controls the High Voltage Power Supply (HVPS).
3. Monitoring of the actual HVPS output to insure that the output is less than 1925volts and
at least 90% of the programmed voltage
4. Monitoring of the peak magnetron current
- If the peak magnetron current exceeds the normal operating current by 25%, the pulse
is terminated. If there are two successive over current pulses. a magnetron current
fault is generated and the radiate command is terminated.
5. Automatically resetting the magnetron current fault.
- The circuitry will reset the fault three times, after that the fault has to be manually
reset,
6. Automatic programming of the filament voltage based on the magnetron average current
3»3
NW,
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 Magnetron 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. CENTER — “OFF" --» Will disable the gate drives with the HVPS "On".
3. “ON" — Allows normal operation.
CAUTION: ONLY in the “Normal Operation Mode” can the transmitter emit R.F.
The Interface and Control CCA has 10 LED indicators which are as follows:
- DS2. H.V. Over Voltage Fault
D33. H.V. Under Voltage Fault
D84. Modulator (HVPS) Average Current Fault
DSS. Magnetron Peak Current Fault
D86. in Test Fault. (Test switch no in "normal operate" position)
D57. HV On/Radia’te (Green)
DSB. Filament (under) Current Fault
DSQ. Filament Read (Green), Time out Complete
D810. Low Voltage Fault
0311. Temperature Fault
All LED indicators are “RED” unless otherwise noted.
3-10 Low VOLTAGE POWER SUPPLY CCA (A4A2)
The chassis mounted Low Voltage Power Supply contains two DC-DC converters which
provide three independent output voltages of +/-15V DC and +5V DC.
3-11 LOW VOLTAGE MONITOR (A4A1l
The (LVMB) samples the following voltages:
0 “P5 VdC
+15 vdc
-15 vdc
+28 vdc'
+3.3 vdc
If any of these voltages are out of tolerance, a Low Voltage fault signal is sent to (A4-A5)
CCA.
3.4
3-12 DC —T0-DC CONVERTER (A5)
The DC-to—DC Converter is the line/load regulator and receives the unregulated 270 VDC
output from the rectifier/filter.
CAUTION: The 270 VDC is not referenced to ground.
The DC-to DC—Converter contains 8 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 The DC-to-DC Converter has three current sense transformers, which
are as follows:
. REGULATOR
o INVERTER
- OUTPUT
The sensed regulator current is used by the regulator IC to control the voltage feedback loop
The inverter current is monitored to limit the transformer primary current The output current
is filtered and buffered to drive the panel meter and monitored for high average current.
3-13 MODULATOR ASSEMBLY (A6)
The Modulator Assembly has five major components or assemblies, which are as follows:
CAPACITOR BANK
IGBT DRIVER CCA
IBGTS
SNUBBER ASSEMBLY
The Capacitor Bank supplies the peak current drawn by the IGBTs when they are driving the
primary of the HV pulse transformerr The IGBT Driver CCA is the interface between the PRF
and Pulse Width Conditioner on CCA (A4-A4) and the IGBTs. The IGBT Driver CCA output
uses a low leakage inductance pulse transformer to isolate and drive the gates of the lGBTs.
The Mod Pulse turns on the lGBTs and the End Pulse helps turn off the lGBTs. The
Snubber Assembly absorbs the inductive energy left in the primary of the HV pulse
transformer at the end of the pulse
3-14 gp CAN ASSEMBLY (AG-12)
The Oil Can Assembly contains the HV pulse transformer, filament transformer and the
pulse-shaping network. Also, there is a current sense transformer to monitor the magnetron
current The HV pulse transformer has a reset winding that when biased with a direct current
allow a larger flux~swing (volt microsecond product).
3-15 RESET CIRCUIT (A7!
The Reset Circuit is comprised of resistor (R2) and the inductors (L1) that provide a constant
reset bias current for the pulse transformer. The 3.3V converter on the A2 CCA supplies the
power, and the current is set by the resistor.
3—5
kw?
«kw
3-16 OVER-TEMPERATURE PROTECTION
The Transmitter contains two thermostats: one mounted on the DC/DC Heatsink and one
mounted on the Modulator Assembly Heatsink. 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 HV/Radiate commandt When the open thermostat is sufficiently cooled, it
will reset (close) and the transmitter will automatically initiate HV ramp-up and radiate.
3-17 MAGNETRON ASSEMBLY (V1)
The magnetron generates a pulses RF output of 250kw. The magnetron is manual tunable
from 5.4 to 5.7 GHz
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Title                           : Image4
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Modify Date                     : 2000:12:01 16:24:11-05:00
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