Sensitivity (MTL) - 74 dBm ± 3 dB (for 90 % reply rate
in mode A/C and 99 % in mode S)
Selectivity ± 15 MHz > 40 dB
± 25 MHz > 60 dB
Dynamic range ³ 60 dB
Bandwidth ± 3 MHz < 3 dB
Modulation (Mode A/C) PAM (Pulse Amplitude Modulation)
Modulation (Mode S) DPSK (Differential Phase Shift
Keying)
Side Lobe Suppression 3-pulse method (Mode A/C)
P5 (Mode S)
Nominal impedance 50 W
C. Transmitter data
Transmit frequency 1090 MHz ± 1 MHz
Transmit modulation 12MOM1D PAM (Pulse Amplitude
Modulation)
Transmitter type Solid state
Transmit power (class 1) ³ 125 W (+ 21 dBW) at antenna end
terminal and ³ 250 W at unit output
Transmit power (class 2) ³ 70 W (+ 18.5 dBW) at antenna end
terminal and ³ 140 W at unit output
Reply rate capability (mode A/C) at least 1200 mode A/C replies
per second for a 15 pulse coded
reply, can be limited to 500...1200
Reply rate capability (mode S) at least 50 mode S replies in
one-second interval (thereof at
least 16 long formats)
Mode S squitter rate (approx.) Acquisition squitter 4/sec.
Extended squitter 1/sec.
Reply code (mode A) ICAO coding system with 4096
pulse reply possibilities (octal
code)
Altitude code (mode C) ICAO coding system 100 ft. steps
from -1000 to 62700 ft.
Altitude code (mode S) 25 ft. or 100 ft. steps
(depending on source)
INSTALLATION AND OPERATION BXP6401-X-(XX)
Page 1-4
34-50-08 September 2011
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