User's Manual

ROCKWELL COLLINS
COMPONENT MAINTENANCE MANUAL with IPL
TDR-94, PART NO 622-9352
STEP PROCEDURE DESIRED RESULTS
6.1 P4 Pulse Width Variation, ATCRSB/MODE-S All-Call
a. Interrogate with a P1, P3, P4 ATCRBS/MODE-S ALL-CALL.
VarytheP4pulsewidthfrom1.45to1.75 s. Ensure that
the downlink MODE-S reply rate exceeds 90%.
Signal level (dBm)
-75 -22
BOT _____ _____
TOP _____ _____
b. Ensure the downlink first preamble pulse occurs 128.00
±0.50  s after the P4 pulse leading edge.
Signal level (dBm)
-75 -22
BOT _____ _____
TOP _____ _____
c. Ensure that the downlink modulation has proper spacing and
widths for the preamble and information pulses. All spacing
and width tolerances are ±30 ns.
Signal level (dBm)
-75 -22
BOT _____ _____
TOP _____ _____
6.2 MODE-S Address
Ensure that the MODE-S address bits will go low individually
witha1.82-k
pull-down resistor and remain high individually
witha18.2-k
pull-down resistor. Use the following table to
locate and address the MODE-S address bits.
NOTE: TDR-94/94D transponders -004 status and later, read
and accept the MODE-S Address during power-on
initialization only. If the MODE-S Address is changed
after power-on initialization, the address will not
be accepted for use in replies to interrogations.
Consequently, if the MODE-S Address provided to
the UUT is changed, power to the UUT may have to
be cycled befor e proceeding with this test.
N
OTE: If the resistor pull-down tests are performed at an
assembly level test, the top-level test may substitute
a short-to-ground, or open circuit, for 1.82 k
and
18.2 k
, respectively. Conduct this test for the bottom
antenna port only and at a convenient input signal level.
Final Performance (Customer Acceptance) Test. Cont.
Table 1001/Table 34-50-96-99A-009-A01
34-50-96
Page 1020
May 18/06