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Procedure
a
P 61
Verification
Receiving Frequency Acceptance.
b
Performance specifications
MS 3.2.2 - MT 5.4.1.2 .
c
Fixed settings
Interrogator at nominal setting except the frequency; PRF 450 Hz
XPDR code : A 1642 .
d
Test progress
100 [ interrogation
reply ] sequences for levels at input XPDR from –60 dBm >> −80 dBm
repeated for 1029 >> 1031 MHz in 0.1 MHz steps.
e
Measurement & display
The program extracts each input power level where the reply % crosses the value 90%;
Diagram : MTL vs. input frequency.
Procedure
a
P 62
Verification
Sidelobe Suppression vs. P1 / P2 Level Ratio.
...
idem Ramp Test set (see page 18) but with levels at XPDR input running from -21 to MTL + 3dB.
Procedure
a
P 63 + 82
Verification
Sidelobe Suppression vs. P1 >> P2 Spacing.
b
Performance specifications
MS 3.8 - MT 5.4.4 .
c
Fixed settings
Interrogator at nominal setting; PRF 450 Hz; P2 at nominal width;
XPDR code : A 1642, altimeter at zero;
d
Test progress
P2/ P1 ratio varying from -12 >> + 3 dB, per 1 dB steps
100 [ interrogation
reply ] sequences for each step
repeated for 3 levels at XPDR input : -21, -50 dBm & MTL + 3 dB.
Mode A, C & Intermode A, C.
e
Measurement & display
For each of the 4 Modes and the 3 input power levels :
a diagram : reply % vs. P1 >> P2 spacing, tolerance areas shown.
Transponders Test Benches Requirements
43