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B
TEST
RF Power Output
RF Frequency
ATCRBS Receiver
Sensitivity
ATCRBS SLS
Level
ATCRBS Reply
Ident
Rev 3, May 2004
ATCRBS TRANSPONDER
TABLE 2-2 Ramp Tests
DESCRIPTION
Measures the effective radiated power
output from the antenna.
Measures the transmit frequency.
Measures the receiver minimum triggering
level (MTL) for a 90% reply rate.
Checks sidelobe suppression function by
varying the SLS pulse level and monitor-
ing transponder reply rates.
Verifies Transponder replies to Mode A
and Mode C interrogations.
Measures F1 to F2 spacing and duration
of pulses.
Verifies Ident function is operating
IM 006-10545-0003.dwd
PASS/FAIL CRITERIA
Minimum of 125 watts.
1090 MHz +/- 3 MHz.
-73 dBm +/- 4.0 dBm.
Reply if P1 exceeds P2 by
9 dB or more.
No reply if P2 equals or
exceeds P1.
Replies to interrogations.
F1 to F2 spacing, 20.3
µsec +/- 0.1 µsec.
F1 and F2 pulse width,
0.45 µsec +/- 0.10 µsec.
.
Reply with SPI present in
ATCRBS Mode A only.
KT 76C
Page 2-17
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