(2) Receiver/Transmitter
(a) The system trigger received from the indicator in the WX, CYC, and MAP modes is applied to the Mod Trig CKt, where it is shaped and sent on to the modulator which develops the required high level pulses to turn on the magnetron. These pulses, have a width of 1.0 microsecond in map mode for the 10, 25, 50, and 100 NM ranges, and 3.5 microseconds for all other modes and ranges, cause the magnetron to generate RF pulses at a frequency of 9345 MHz. The RF pulses are then directed to the antenna by the circulator.
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TILT
50100 200
0FF STBY WX CYCMAP10
5
+15
25300
115V AC
10
TEST GAIN INT 0
OFF ON
ELEX BUS 2
PRE
C121
SET
5
-15
24-50-01
10
WEATHER RADAR (AC)
30 030
28V DCELEX BUS 2
FRZ
AZIM
C120
A
24-30-00
F
WEATHER RADAR (DC)
P18-1 CIRCUIT BREAKER PANEL
60
60 SEC TGT
D195
S
T
Q-
SCAN P9-1
ALRTG-
S
CRT OFF V INT ARM
DC
F-+5V
K-
STBY OR
DC I-
OFF MODE
OFFP-
INT
U GENERATOR
RANGE CLOCK
INTENSITY +23VT
DC R
STBY XMT INHIBIT (GND)
GAIN WX IFROMSH 2
PRESET CYC MODE
AUTO GAIN H
VAR
TO +5V
MAP MODE
SH 2 DC
CYC
Y
GAIN
100 200
50
25300
MAP STC
10 TEST
W PULSE WIDTH CONTROL
TEST (GND)
P +23V DC
A-
MAP ON
J-+23VDC
OFF
ON OFF
10020010
50
25
5
+15 STAB
10
300
TEST L
0
N A H-
5
-15 SH 2 10
B
RANGE TILT SH 2
P9-1 WEATHER RADAR INDICATOR (PILOTS CONTROL STAND)
Weather Radar System Schematic
Figure 3 (Sheet 1)
1
D189
5
6
PROGRAM
MOD TRIGGER
TIME DELAY26 PULSE WIDTH46
K1 POWER CONTROL
ON-OFF RELAY
AGC
34
37
RCVR VIDEO VIDEO
BLANKING
45 AMPL POWER AGC
55
SUPPLY
49
MOD TRIGGER STC 16 NOISE GATE 38
IF AMPL
MODULATOR
FAULT DET
35
PWR SWITCHING
36
27
PRESET GAIN
41 MAP STC
39 TEST
25 PULSE WIDTH CONT
51
LOCAL
TEST (GND)
WAVEGUIDE BALANCEDOSCILLATOR
LOGIC MIXER
48 9315 MHZ
50
TR SWITCH AFC MIXER AFC
FIXED MAGNETRON
STABIL-CIRCULATOR
9345 MHZ
IZATION 8 KW PEAK
47 M101 RECEIVER-TRANSMITTER (STA 200)
D887A
C DUMMY
LOAD
D
E
F
K1 WAVEGUIDE
CAPPED
LOGIC RELAY
M579 WAVEGUIDE SWITCH (STA 200)
TO
C
SH 2
TO
D
SH 2
TO
E
SH 2
FROM
F
SH 2 IRS-2
DATAB4SS ROLL
ATTITUDE
PITCH
ATTITUDE
M1164 DAA-2
COS PITCHSINE ROLLAZ RSLVRAZ RSLVRAZ RSLVR
G
ELEV SYNCHROELEV TACHELEC TACHELEV MOTORELEV MOTOR
D189
42
44
40
30
31
32
33
12131110201423242122
A 737-300/400/500MAINTENANCE MANUAL
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K09202
A 737-300/400/500MAINTENANCE MANUAL
M62 ANTENNA (STA 178 BULKHEAD)
Weather Radar System SchematicFigure 3 (Sheet 2)
K09224
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