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shown in the column Interference limiting priority. The lowest
numbered steps in the sequence are dropped or reduced first.
The timing of individual pulses or steps in either sequence is
defined in Figure A-3 which illustrates the three lowest-power
steps in the top-forward antenna sequence. The first pulse of the
interrogation serves as the second pulse of the suppression.
3.2.2.4 The minimum triggering level (MTL) values
tabulated in Figure A-2a and Figure A-2b are based on the
assumption that rcplics to all interrogations are received
Attachment Annex 10 - Aeronautical Telecomrnunicatbns
STEP
NUMBER
s. .I
TOP S . 1
ANTENNA S. .I
S.1
FORWARD S. * T
DlRECTION S. I
S. . I
S . 1
, S . . I
S. I
S . . I
S . I
S. .1
S. [
S..1
S. I
S. . I
S . l
S. - 1
S. 1
S. .1
S. I
.S .. . I. I
MINIMUM EFFECTIVE
MDIA'rED
W'NTERROGATION POWER
(dBn7)
27 37 47 5 7
E1:FEC'IIVE RADIATED POWER (dBm)
NOTES..---- "I" indicates ERP of P,, P,, and P, interrogation pulses.
"S" indicates ERP of S, suppression pulse.
"S . I" means that the S, ERP k 2 dB less than the interrogation ERR
"S. . I" means that the S, ElW Is 3 dB less than the Interrogatfon EM
In steps 24, 63, 64, 79 and 83, no S, pulses are transmitted.
[NTERFERENCE
LIMl'fING PRIORITY MTI..
(-dRm)
74
74
74
74
74
74
74
73
72
7 1
70
69
68
67
66
65
64
63
62
61
60
59
58
5 7
Figure A-2a. Example of high-density whispershout sequence
Annex 10 - Aeronautical Telecommunications Volume IV
STEP
NlJMRER
MINIMUM EFFECTIVE
RADIATED
INTERROGATION POWER
(dB@
S. . I
TOP S. I
ANTENNA S. . I
S- I
S. . I
LEFT & RlGHT S. I
DIRECTIONS S - I
S. I
S. .I
S . I
S . . I
S. I
S. .I
S.1
S..1
S. I
S. . I
S.1 s. . I . . . .1
S.1
S. . I
S. I
S. . I
S. I TOP
S. . I ANTENNA
S. 1
S. . I AFT
S. 1 DIKECTION
s. .1
S. 1
S- . I
S.1
S. .I . . . .1
S. . I
S. .I BOTTOM
82
83 ANTENNA 2 8
I I I I
2 7 37 47 5 7
EFFECTIVE RADIATED POWER (dBm)
NOTES.--- "I" indicates EM' of P,, P,, and P, interrogation pulses.
"S" i~tdicuiesL RP of S, suppression pulsr.
"S - I" means that the S, ERP is 2 dB less than the interrogation ERP.
"S. . I" meatis that the S, ERP is 3 dB less than the inlerrogution ERE1
In srepr 414, 63, 6-1, 79 and 83, no S, pulses are transmitled.
INTERFERENCE
1,IMITrNG PRIORITY
Figure A-2a. Example of high-density whisper-shout sequence (con't)
Attachment Annex 10 - Aeronautical Telecommunications
STEP
NUM13ER
MINIMUM EFFECTIVE
INTERROGATION POWER IJMITING PRIORI'TY M'I'L
(dBtn) (-dBm)
S.........I
Top Antenna
S . . . . . . . . . I
Left & Right
S . . . . . . . . . I
Direction s ......... I
-I
s ..... . . . . I
Top Antenna s ......... I
Forward
S ......... I
Direction s ........ . I
s . . . . ..... 1
Top Antenna
s ......... 1
Rear Direction s. ........ I
52
48
44
40
Note.- Each I dB reduction 74
in the scqzience follows
the priorip for the fonvnrd 74
beam in Figure A-2u.
72
48 Note.-- Each I db reduction 74
in the sequence follows
44 the prior@ for the rightleft 72
beam in Figure A-2a.
40 6 8
43 Note.- Each I db reduction 7 1
in the sequence follows
3 9 the priority for the rear 67
beam in Figure A-2a.
3 5 63
S . . I
Bottom Omni
S.. I
34 Note.- Each I db reduction 62
in the sequence follows
3 2 the priori~fo r the bottom 60
beam in Figure A-2a.
3 0 S 8
22 32 42 5-2
MIN EFFECTIVE RADIATED POWER (dRm)
NOTE- "I" indicates ERP of P, P, and P, interrogation pulses.
"S" indicates ERP of S, suppression pulse.
"S. . I" means that the S, ERP is 3 dR less than the interrogation ERP
"S ......... I" means that the S, ERP is I0 dB less than the interrogation EM
In the last steps of each quadrant, no S, pulses are transmitted.
Figure A-2b. Example of low-density whisper-shoat sequence
Annex 10 - Aeronautical Telecommunicatwns Volume ZV
Figure A-3. Timing for lowest power steps in omnidirectional
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