User's Manual

ROCKWELL COLLINS
COMPONENT MAINTENANCE MANUAL with IPL
TDR-94, PART NO 622-9352
STEP PROCEDURE DESIRED RES ULTS
2.2
(Cont)
(This test applies to TDR-94D only.)
c. Set the self-test inhibit discrete to active to prevent
squittering. Ensure that the transmitter power output of the
nonselected antenna is attenuated at least 20 dB relative
to the selected antenna during the time the transmitter is
transmitting on the other antenna p ort. S et the self-test
inhibit discrete to disable after completing the test.
Nonselected antenna power Spec: MIN. 20 dB attenuation _____
2.3 Transmitter Spectr um and Reply Pulse Shape
Set up to transmit only MODE-S replies at 50/second. Obser ve
the output spectrum with a spectrum analyzer. Use a 100-kHz
resolution bandwidth or less. Use the peak level reference
recorded in step 2.2. for the measurements below. Ver ify the
spectrum does not exceed the following limits:
Frequency Difference
(
MHz from Carrier) Spec:
>= 1.3 and <7 3
>= 7 and <23 20
>= 23 and <78 40
>= 78 60
Max Relative Response
(
dB down from peak ref)
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_____ _____
_____ _____
_____ _____
_____ _____
2.4 Reply Pulse Shape
For both ATCRBS and MODE-S replies, verify that the pulse
rise time is less than 100 ns and that the pulse decay time is
less than 200 ns.
ATCRBS
MODE-S
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RISE FALL RISE FALL
____ ____ ____ ____
____ ____ ____ ____
If these results are not met,
select A3C216 test select
value from page 10150 (figure
6) to get results into spec s.
2.5 Burst Tests
For these tests, verify correct replies and output power for all
interrogations.
2.5.1 ATCRBS B urst Tests
Verify that at least 120 ATCRBS 15-pulse replies can be
generated in 100 ms. Repeat the test at a once per second rate.
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_____ _____ (x)
Final Performance (Customer Acceptance) Test. Cont.
T
able 1001/Table 34-50-96-99A-009-A01
34-50-96
Page 1014
Mar 14/08