User's Manual

ROCKWELL COLLINS
COMPONENT MAINTENANCE MANUA L with IPL
TDR-94, PART NO 622-9352
STEP PROCEDURE DESIRED RESULTS
2.17 a. Set the MODE-S Test Set for a -50 dBm MODE-S ONLY
ALL-CALL interrogation signal.
b. Inject an interference pulse of 0.80 μs duration at a
carrier frequency of 1030 MHz, that is incoherent with the
interrogation. Set the amplitude of the interference pulse to
-3dB less than the desired signal leve l.
c. Adjust A7C104 for maximum reply efficiency.
NOTE: DPSK adjustments are interactive. The adjustments in
steps 2.15 thru 2.17 should be check ed again before
performing the remaining procedures.
2.18 a. Monitor J7-33 with the oscilloscope.
b. Interrogate the bottom channel with MODE-A and MODE-C
interrogations that have a signal strength of -67 dBm.
c. Measure and record the video amplitude of the P1 observed. P1 video amplitude: _____
d. Turn off all interrogations to the UUT.
e. Enable the self-test function. Then adjust A7R122 until the
P1 video signal at J7-33 is equal to the P1 video amplitude
recorded above.
The P1 video amplitude is
within ±0.2V of the recorded
in step 2.18.c above.
2.19 Verify that no fault codes are indicated in either the ‘F3’ CSDB
output word or the ‘350’ ARINC -429 maintenance data output
word.
2.20 If the UUT fails the Mode-S Only reply rate, as specified in step
1.1.A of Table 1001/Table 34-50-96-99A-009-A01 at ambient or
during temperature test, first verify the DPSK alignment and then
complete temperature testing as necessary.
2.21 After alignment is complete, remove all power from the test
equipment and reassemble the UUT.
Alig
nment Procedure
Table 1002/Table 34-50-96-99A-010-A01
34-50-96
Page 1080
May 18/06