Kt 73 Receiver Characteristics; Sensitivity Variation With Frequency; Bandwidth; Sensitivity And Dynamic Range - Honeywell BENDIX KING KT 73 Installation Manual

Preliminary - Subject To Change Without Notice
BENDIX/KING
1.3.2

KT 73 RECEIVER CHARACTERISTICS

Sensitivity Variation with Frequency:

The RF input level required to produce 90% replies will not vary by more than 1 dB and will at no
time exceed a level of -69 dBm for standard ATCRBS interrogations in the frequency range be-
tween 1029.8 and 1030.2 MHz.

Bandwidth:

A standard ATCRBS interrogation signal required to trigger the transponder below 1005 MHz and
above 1055 MHz will be at least 60 dB stronger than that required to trigger the transponder at
1030 MHz with the same reply efficiency.

Sensitivity and Dynamic Range:

The minimum triggering level (MTL) is defined as the minimum input power level that results in a
90% reply ratio if the interrogation has nominal pulse characteristics.
A. The MTL for ATCRBS and ATCRBS/Mode S All- Call interrogations will be -73
dBm ± 4 dB.
The MTL for Mode S interrogations will be - 74 dBm ±3 dB.
B.
C. The reply ratio will be at least 99% for all Mode S interrogations between MTL +3
dB and -21 dBm and at least 90% for ATCRBS and ATCRBS/Mode S All-Call in-
terrogations between MTL and -21 dBm.
D. The variation of MTL between ATCRBS Mode A and Mode C interrogations will not
exceed 1 dB.
ATCRBS, Mode S,ATCRBS/Mode S All-Call Low-Level Reply Ratio:
The reply ratio will not be more than 10% for interrogations at signal levels below -81 dBm.
L.O. Leakage:
L.O. level at 970 MHz will not exceed -73 dBm.
1.3.3 KT 73 TRANSMITTER CHARACTERISTICS
Reply Transmission Frequency:
The transmitter frequency of the reply will be 1090 ±1 MHz when observed into a 50 ohm load with
a VSWR of 1.5:1 or less.
Rev 0, October/2002 10563I00.JA
KT 73
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