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3.1.1.8.2.
3.1.2.11.3 Imcn've-stule interrogator output powel: When the interrogator transmitter is not transmitting an
interrogation, its output shall not exceed -5 dBm effective radiated power at any frequency between 960 MH' and
1 215 MHz.
Note.- This constraint ensures that aircraflflying near the interrogator (as close as 1.85 km (1 NM)) will not receive
interference that would prevent them from being tracked by another interrogatol: In certain instances even smaller
interrogator-to-aircraft distances are of significance, for example if Mode S surveillance on the airport su@ace is used.
In such cases a further restraint on inactive state interrogator output power may be necessary.
3.1.2.1 1.3.1 Spurious emission radiation
Recommendation.- CW radiation should not exceed 76 dB below 1 watt.
3.1.2.11.4 Tolerances on transmitted signals. In order that the signal-in-space be received by the transponder as
described in 3.1.2.1, the tolerances on the transmitted signal shall be as summarized in Table 3-9.
3.1.2.1 1.5 SPURIOUS RESPONSE
Recommendation.- The response to signals not within the passband should be at least 60 dB below normal
sensitivity.
3.1.2.1 1.6 Lockout coordination. A Mode S interrogator shall not be operated using all-call lockout until coordination
has been achieved with all other operating Mode S interrogators having any overlapping coverage volume in order to
ensure that no interrogator can be denied the acquisition of Mode S-equipped aircraft.
Note.- This coordination nzay be via ground network or by the allocation of interrogator identifier (11) codes and will
involve regional agreements wh,ere coverage overlaps international boundaries.
Annex 10 - Aeronautical Telecommunications Volume IV
3.1.2.1 1.7 MOBILE INTERHOGA TORS
Recommendation.- Mobile interrogators should acquire, whenever possible, Mode S aircraft through the reception
of squitters.
Note.- Passive squitter acquisition reduces channel loading and can be accomplished without the need for
coordination
Table 3-9. Transmitted signal tolerances
Reference Function Tolerance
3.1.2.1.4.1 Pulse duration P1, P2, P,, P4, P5 k0.09 microsecond
Pulse duration P6 i0.20 microsecond
3.1.1.4 Pulse duration PI - P3
Pulse duration PI - PZ
i0.18 microsecond
+0.10 rnicrosccond
3.1.2.1.5.1.3 Pulsc duration P3 - P4 ~0.04m icrosecond
3+1.2.1.5.2.4 Pulse duration PI - P2 20.04 microsecond
Pulse duration P2 - sync phase reversal e0.04 microsecond
Pulse duration P6 - sync phase reversal +0.04 microsecond
Pulse duration P5 - sync phase reversal k0.05 microsecond
Pulse amplitude P,
3.1.2.1.5.1.4 Pulse amplitude P4 P3 20.5 dB
3.1.2.1.5.2.5 Pulse amplitude P6 Equal to or greater than P2 - 0.25 dB
3.1.2.1.4.1 Pulse rise times 0.05 microsecond minimum,
0.1 microsecond maximum
3.1.2.1.4.1 Pulse decay times 0.05 microsecond minimum,
0.2 microsecond maximum
Chapter 3 Annex 10 - Aeronautical Telecornrnunicatio~zs
APPENDIX TO CHAPTER 3
SSR automatic pressure altitude transmission code
(pulse position assignment)
RANGE
INCREMENTS
(Feet)
-1 000 to -950
-950 to -850
-850 to -750
-750 to -650
6 5 0 to -550
-550 to 450
450 to -350
-350 to -250
-250 to -150
-150 to -5 0
-50 to 50
50 to 150
150 to 250
250 to 350
350 to 450
450 to 550
550 to 650
650 to 750
750 to 850
850 to 950
950 to 1 050
1 050 to 1 150
1 150 to 1 250
1 250 to 1 350
1 350 to 1 450
1 450 to 1 550
1 550 to 1 650
1 650 to 1 750
1 750 to 1 850
1 850 to 1 950
1 950 to 2 050
2 050 to 2 150
2 150 to 2 250
2 250 to 2 350
2 350 to 2 450
2 450 to 2 550
2 550 to 2 650
2 650 to 2 750
PULSE POSITIONS
(0 or I in a pulse position denotes
abscncc or prcsencc of u pulse, respectively)
Dl D4 A1 A, A4 Bi BZ B4
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 I
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 1
0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 0
0 0 0 0 0 0 I 0
0 0 0 0 0 0 1 0
0 0 0 0 0 0 I 0
0 0 0 0 0 0 1 0
0 0 0 0 0 1 1 0
0 0 0 0 0 1 I 0
0 0 0 0 0 1 1 0
0 0 0 0 0 1 1 0
0 0 0 0 0 1 1 0
0 0 0 0 0 I I 1
0 0 0 0 0 1 1 1
0 0 0 0 0 1 I I
0 0 0 0 0 1 1 1
0 0 0 0 0 1 1 1
0 0 0 0 0 1 0 1
0 0 0 0 0 1 0 1
0 0 0 0 0 1 0 1
0 0 0 0 0 1 0 1
0 0 0 0 0 1 0 I
0 0 0 0 0 I 0 0
0 0 0 0 0 I 0 0
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