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These are the functions of the WXR receiver/transmitter (R/T):

Make and transmit RF pulses

Process RF return signals

Make display data

Send display data to the DEUs

Supply antenna stabilization

Monitor and do system operation test

Send fault status and test data to the DEUs

Make WXR display test patterns show on the display units.


The WXR R/T provides these displays to the DEUs:



Map (ground mapping).


Physical Description

The WXR R/T weighs 31.5 lbs. Forced air from the WXR R/T mount cools the WXR R/T. The front panel of the R/T has these items:

Coax test connector

Test connector.





The WXR R/T mount:

Holds the R/T

Connects the R/T to the airplane wiring

Connects the R/T to the waveguide

Supplies cooling air to the R/T.


The test switch does a test of the fan.




Antenna Assembly

These are the parts of the antenna:

Flat plate antenna

Antenna pedestal.


Flat Plate Antenna

The flat plate antenna transmits and receives RF pulses.

The flat plate antenna is an array of radiation slots. The RF pulses radiate from each of the slots. The antenna makes a beam 5.4 degrees high and 5.4 degrees wide. The antenna weighs 6 lb (2.7 kg). It is 23 inches wide.

Antenna Pedestal

The antenna pedestal contains these items:

Scan motors

Antenna position monitors

Elevation and scan disable switches.


There is a horizontal scan motor to move the antenna +/- 90 degrees from the airplane centerline. There is also an elevation scan motor to move the antenna +/- 40 degrees up or down. This value includes manual tilt selection from the WXR control panel.

There is a zero position monitor and an incremental monitor for each motor. These monitors send antenna horizontal scan and elevation scan position data to the WXR R/T. There are elevation and azimuth scales that permit a visual measurement of the tilt and scan angles.


There are elevation and azimuth synchros. These synchros send the antenna positions to the WXR R/T. The WXR R/T gets antenna position data from the synchros. The WXR R/T also has a command position. The monitor circuit in the R/T tells when there is a difference between the two values. Then it sets an antenna failure.

There are elevation and scan disable switches on the antenna pedestal. They remove power to the scan and elevation motors. Use these switches to prevent movement of the antenna during maintenance. The switches do not stop RF transmissions from the WXR R/T.

A torque spring in the antenna pedestal balances the weight of the antenna. When you remove the antenna, the torque spring moves the elevation drive to the upper position.

Date: 2016-01-14; view: 626

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