Telephonics Corporation
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A D A R
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Y S T E M S
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I V I S I O N
TM113806 (3/10)
2-41
(3)
Press STAB pushbutton to disable antenna stabilization.
(4)
While flying level (0 degree pitch, 0 degree roll), adjust the TILT control on the radar indicator to
obtain the video pattern shown in Figure 2.8-1. Note TILT control setting. The terrain band
should be displayed about the third range mark.
If the inner ring of video is not parallel to the range mark, the error is caused by mechanical
displacement of the antenna about the roll axis of the aircraft. Use TILT control to determine
exact error. Correction on the ground, if necessary, must be performed prior to further in-flight
calibration.
(5)
Press STAB pushbutton again to restore stabilization.
Figure 2.8-1. Typical Video Pattern Level Flight, Antenna Mounting Reference and Stab. Satisfactory
(6)
The pattern observed in step (4) should not change. If the pattern shifts as in Figure 2.8-2 or
Figure 2.8-3, it will be necessary to ground-check leveling of the gyro and accuracy of the
horizon indicator. Use TILT control to find exact error.
(7)
Roll the aircraft 20 degrees right. For perfect stabilization, the terrain band shown in Figure 2.8-1
should not shift.
(8)
In step (7), if the terrain band shifts as shown in Figure 2.8-2, increase the tilt angle, by means of
the TILT control on the control unit, until the pattern is similar to Figure 2.8-1. Note the new
position of the TILT control. It should not be more than two degrees above that noted in step (4).
(9)
In step (7), if the terrain band shifts as shown in Figure 2.8-3, decrease the tilt angle (using the
TILT control) until the pattern is similar to Figure 2.8-1. Note the new position of the TILT
control. It should not be more than two degrees below that noted in step (4).
(10)
If the differences between steps (8) and (4) or steps (9) and (4) are greater than two degrees,
recalibrate the roll stabilization circuitry to the gyro using the following procedure:
The document reference is online, please check the correspondence between the online documentation and the printed version.
