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 C.  The R/T is a completely solid state unit which transmits, receives, processes video, supplies antenna stabilization signals, and provides system monitoring for the weather radar system. The R/T provides pulse transmission in the X-band frequency range for detection of storm conditions at ranges of up to 320 miles and for terrain mapping. 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 microprocesor-controlled antenna stabilization servo loop, which provides antenna line-of-sight stabilization. Microprocessor-controlled system monitoring of key system parameters for fault detection is also an integral part of the R/T's function. See System Monitoring and Messages in Operation discussion.
 D.  The front panel of the R/T may have an elapsed time indicator, and has an Automatic Test Equipment (ATE) connector. The front panel may also have an overtemperature fault indicator, and a fault reset button. The overtemperature fault indicator and the RESET button are both inoperative.
 5.  Waveguide_________
 A.  The waveguide connects the R/T to the antenna. The waveguide is X-band, and is pressurized with cabin pressure. A cover flange connects the waveguide to the R/T and passes through a pressure seal where the waveguide leaves the airplane's pressurized area and enters the nose-cone area. The waveguide connects to the antenna with a choke flange and quick-disconnect clamp.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 B.  Waveguide section 1 has a drain hole to allow moisture to go out of the waveguide run from the antenna and the receiver/transmitter. The drain hole is located on the bottom side of waveguide section 1 just aft of the pressure seal on the forward pressure bulkhead.
 6.  Antenna_______
 A.  The antenna is mounted on the airplane bulkhead behind the radome in an unpressurized section of the airplane. It is used for both transmitting and receiving for the receiver/transmitter unit. The antenna receives power and control signals from the receiver/transmitter unit only.
 B.  The antenna consists of an antenna pedestal and antenna planar array. The pedestal has a scan and elevation disable switch to disable the planar array for maintenance purposes. The planar array is an array of individual radiation slots. The radiation from each of these slots combine to generate a circular pencil beam.
 C.  Operation of the antenna tilt control, on the control panel, up or down from the zero position impresses a fixed angle on the stabilized/boresight zero position of the antenna planar array. Maximum compensating movement of the antenna is 45-degree combined pitch and roll plus or minus the TILT angle set.
 7.  Electronic Horizontal Situation Indicator (EHSI)________________________________________________
 A.  The EHSI is a CRT that provides displays for several electronic systems. The captain's EHSI is located on the captain's instrument panel (P1). The first officer's EHSI is located on the first officer's instrument panel (P3). The following paragraphs describe the displays for the weather radar system:
 (1)  
The weather radar data is displayed on the EHSI's in a low intensity, raster dormat. The weather and turbulence data is displayed in a four color format. Each color (green, yellow, red, and magenta) represents a range of moisture gradients. Position on the EHSI of the displayed weather radar data corresponds to the actual storm position in relation to the airplane. Display position is also dependent on the selected range.

 (2)  
The ground return data is displayed in a similar manner as the weather data in green, yellow and red. The colors represent the variations in the terrain.

 (3)  
For normal weather radar WXR operation, the EHSI provides the following displays during EFIS operating modes of EXP VOR/ILS, MAP, CTR MAP and NAV. A four color coded WXR data display is provided at the following intensity ranges.

 (4)  
Three range arcs are displayed at equal distances apart. Each arc represents one-fourth of the selected range. One-half the selected range (white numerics) is placed beside the center range arc. It equals one-half of the total display range selected on the EFIS control panel.

 (5)  
The range marks are always displayed in the EFIS MAP mode. In the NAV, and VOR/ILS mode, they are only displayed when the EFIS WXR power switch is in the ON position.
　
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