Test Specification for Eurobalise FFFIS

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Page 30 of 332 SUBSET-085, Issue 2.2.2 November 9, 2007 4.2.2.4 Evaluation of Up-link Conformity in the Contact Zone The results from the measurements in sub-clause 4.2.2.3.3 on page 29 (P 42DIFF ) shall be compared with the requirements in Part 1 of this Norm regarding conformity in the contact zone. The field generated by the Balise shall be compared with the “Reference Field”. The requirement stated in Part 1 of this Norm is: • For the field generated by the Balise ± 1.5 dB. The value P 42DIFF reflects the absolute difference between the Reference Loop and the Balise. The requirement states the relative conformity. Therefore, the comparison with the requirement shall be relative. The Balise is conform for the field generated by the Balise if: The highest P 42DIFF - the lowest P 42DIFF is less than 3 dB (P 42DIFFMAX - P 42DIFFMIN ) < 3 dB
Page 31 of 332 SUBSET-085, Issue 2.2.2 November 9, 2007 4.2.2.5 Calibration of 4.2 MHz Balise Loop Current in the Side Lobe Zone Use the same test set-up as in sub-clause 4.2.2.2.1 on page 26. The calibration procedure is the same as in subclause 4.2.2.2.3 on page 27 except for the geometrical test points. Perform the calibration procedure with the geometrical test points listed in clause C2 of Annex C on page 201. 4.2.2.6 Up-link Reference Field in the Side Lobe Zone The output signal in the Side Lobe Zone for Up-link is defined in Part 1 of this Norm. The output signal from the Reference Loop is measured in sub-clause 4.2.2.5, and the result is a set of P 42RL values that shall be used to form a “Reference Field”. This Reference Field gives the limits for the Balise output field strength in the Side Lobe Zone. The tolerances for conformity with the Reference Field, stated in Part 1 of this Norm, are +5 dB to -∞. The Balise shall consequently give test results that show lower values than the Reference Field increased by 5 dB. The Reference Loop output shall also be translated +5 cm and –5 cm along the X and Y axes to form the Reference Field. See Figure 4 that shows a Reference Field in one quadrant. Similar curves shall be plotted for all quadrants. The Reference Field is the curve formed by the highest of: • 35 dB below R0 (P 42RL value for position [X = 0, Y = 0, Z = 220]) • Reference Loop output displaced –5 cm • Reference Loop output • Reference Loop output displaced +5 cm 5 cm Reference field 35 dB R0 Reference Loop field strength Contact zone Side lobe zone Cross-talk protected zone Figure 4 Up-link Reference Field in the Side Lobe Zone The co-ordinates that shall be evaluated are: X = 250 to 1300, Y = 0, Z = 220 X = -250 to -1300, Y = 0, Z = 220 X = 0, Y = 200 to 1400, Z = 220 X = 0, Y = -200 to -1400, Z = 220 4.2.2.7 Balise Up-link Conformity Measurements in the Side Lobe Zone Use the same test set-up as in sub-clause 4.2.2.3.1 on page 28. The test procedure is the same as in sub-clause 4.2.2.3.3 on page 29, except for the geometrical test points and that it is not needed to calculate the difference between P 42RL and P 42BA . Perform the test procedure with the geometrical test points listed in clause C2 of Annex C on page 201. Exclude the geometrical points: [X = 200, Y = 0, Z = 220], [X = -200, Y = 0, Z = 220], [X = 0, Y = 150, Z = 220], and [X = 0, Y = -150, Z = 220]. Plot the value P 42BA as a function of the position in four graphs, one for each quadrant.
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Test Specification for Eurobalise FFFIS

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