747-400 AMM 飞机维护手册 导航 NAVIGATION 2(83)

 (4)  
The antenna TILT control provides manual control of the radar antenna elevation.

 (5)  
The GAIN control is used to adjust the gain of the receiver in the receiver/transmitter.

 3.  Receiver/Transmitter
____________________
 A.  The R/T units are installed in two single R/T mounts on the E5-1 and E5-2 shelf assemblies. The shelf assemblies are located on the centerline of the compartment floor in the nose cargo door section.
 B.  The R/T is a completely solid-state unit which transmits, receives, processes video, supplies antenna stabilization signals, and provides system timing and monitoring for the weather radar system. The R/T provides a nominal frequency of 9345-MHz transmission in the X-band frequency range for detection of weather conditions at ranges of up to 320 miles and for terrain mapping. A frequency agility feature shifts the frequency up and down from 9360 to 9330 MHz to reduce mutual interference with nearby transmitters. The R/T contains circuitry which automatically compensates for near and far targets and weakened radar returns due to penetration of weather storm cells. The R/T contains a microprocessor-controlled antenna stabilization servo loop, which provides antenna line-of-sight stabilization. Microprocessor-controlled system timing and monitoring of key system parameters for fault detection is also an integral part of the R/T function. See the R/T monitoring operations in the Receiver/Transmitter Functional Description.
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A

747-400
MAINTENANCE MANUAL

RECEIVER/ TRANSMITTER (2 LOCATIONS)
SEE A
FWD
RECEIVER/TRANSMITTER SEE BMOUNTS AND WAVEGUIDE
SWITCH - FREIGHTER
SEE C
WAVEGUIDE
FREIGHTER
PILOTS' OVERHEAD PANEL, P5
SEE L PILOTS' OVERHEAD
CAPTAIN'S  CIRCUIT BREAKER
WARNING SPEAKER  PANEL, P7
PILOTS' FIRST OFFICER'S
LIGHTSHIELD, P10 WARNING SPEAKER SEE K
FIRST OFFICER'S
CAPTAIN'S  MASTER WARNING
MASTER WARNING
AND CAUTION LIGHT AND CAUTION LIGHT
FIRST OFFICER'S
INSTRUMENT PANEL, P3CAPTAIN'S INSTRUMENT
PANEL, P1 SEED EF
SEEDI J
LEFT AND RIGHT WEATHER RADAR CONTROL DISPLAY CONTROL PANEL, P8 UNIT, P9
SEE G SEE H
FLIGHT COMPARTMENT
Weather Radar System - Component Location
Figure 1 (Sheet 1)

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M50252
A
747-400 MAINTENANCE MANUAL
BendixWX RADAR Air Transport Avionics
SYSTEM CHECKER RTA-4B SWXX VERXX
test menu
RECEIVER/TRANSMITTER  RIGHT RECEIVER/
TRANSMITTER A LEFT RECEIVER/
TRANSMITTER
SHELF ASSEMBLY (E5-2)
ANTENNA PLANAR ANTENNAARRAY DRIVE
ASSEMBLY
RECEIVER/ TRANSMITTER
FWD WAVEGUIDE MOUNT SWITCH
SHELF
ASSEMBLY
WAVEGUIDE TO E5-1
ANTENNA
RECEIVER/TRANSMITTER MOUNTS AND WAVEGUIDE SWITCH - FREIGHTER
C
TO RECEIVER/TRANSMITTER
WEATHER RADAR ANTENNA
B

Weather Radar System - Component Location
Figure 1 (Sheet 2)

M50264
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A

747-400
MAINTENANCE MANUAL

D

FIRST OFFICER'S DISPLAY TRANSFER MODULE

Weather Radar System - Component Location
Figure 1 (Sheet 3)

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