(2) Checking side lobe suppression (SLS)
(a) Set SQUAWK/NAUT I to mode A on and 400 interrogations per
second.
(b) Set pulses P 1 and P 2 to same amplitude.
(c) Alter the HF input level from - 69 dBm to - 24 dBm, whereby the
transponder must reply to not more than 1 % of the interrogation
pulses.
(3) Checking reply pulses
(a) Set SQUAWK/NAUT I to mode A at and 400 interrogations per
second. Set pulses P 1 and P 3 to - 60 dBm.
(b) Transmit frequency must be 1090 MHz ± 3 MHz.
(c) The output power shall be ≥ 250 W of the antenna terminal.
CAUTION : If RG 58 C/U is used as indicated in the test
setup Fig. 2-1, the cable attenuation of app. 1 dB
will reduce the output power by app. 50 W.
(d) Pulse spacing between the frame pulses F 1 and F 2 must be
20.3 µs ± 0.1 µs.
(e) The width of a reply pulse must be 0.45 µs ± 0.1 µs.
(f) The necessary spacing between the reply pulses is 1.45 µs
± 0.1 µs.
(4) Checking reply limiting (AOC)
Set SQUAWK/NAUT I to max. interrogation rate at which the transpon-
der must respond with min. 1200 replies/s.
(5) Checking the SPI hold time
(a) Briefly press the IDENT button on the transponder.
(b) For approx. 30 seconds, the SPI pulse must appear after the
last frame pulse F 2 at a spacing of 4.35 µs.
INSTALLATION AND OPERATION
ATC 3401 - (1) - R
Page 2-2
34-50-03 June 15/96
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