SKY899
Installation Manual
Page 3-8 - Installation Checkout
009-11900-001
July 18, 2013
Revision F
Figure 3-4: Typical Patch Antenna Tripod Mount
13.
From each test point (see step 12):
a. Position the TT391 Patch Antenna facing the SKYWATCH HP aircraft under test.
b. Set the TT391 POWER switch to the ON position.
c. Verify that the display shows, in the direction (± 30 degrees) of the TT391, two targets; a Traffic
Advisory (i.e., a solid circle) at ¼ nm and Other Traffic (i.e., open diamond) at 4.5 nm. Both
targets will be displayed in level flight at own aircraft altitude (i.e., "00" displayed above the
traffic symbol).
NOTES
1.
If the display reflects a gross error in target bearing, check the
directional antenna cables at TRC connectors J9 (sum port) and J11
(difference port). They may be reversed. A further indication of this
condition would be a target that moved in a counter-clockwise
direction when the TT391 is moved in a clockwise direction.
2.
Multiple targets or a faulty bearing may result from multipath
distortion (see step 1).
3.
During these tests, the SKY899 may detect and display other active
targets.
4.
To obtain a better line of sight, it may be necessary to elevate the patch
antenna.
d. Set the TT391 POWER switch to the OFF. Repeat procedure from each test point. Step 15 can be
done from the last test point.
NOTE
To prevent SKYWATCH HP from tracking the movement of the test-set, it
is necessary to set the TT391 POWER switch to OFF after completing
each bearing measurement.
14.
Return the TT391 assemblies to their position in the aluminum carrying case.
15.
Restart SKY899 by cycling power OFF and then ON.
16.
Connect an oscilloscope to the suppression bus and verify that the SKY899 suppression pulse (100
µ
s
±
5
µ
s) e15 V dc. If less than +15 V dc the suppression bus is overloaded. Check all
equipment connected to the bus. Repair/replace the offending device.
17.
Cycle power to the SKY899 and verify the standby screen appears after approximately 30 seconds.
Press OPR soft-key (4) and verify the MSG label does not appear on the display after 10 seconds.
NOTE
The document reference is online, please check the correspondence between the online documentation and the printed version.
