Test Specification for Eurobalise FFFIS

Page 46 of 332
SUBSET-085, Issue 2.2.2
November 9, 2007
4.2.3.7 Balise Tele-powering Conformity Measurements in the Side Lobe Zone
Use the same test set-up as in sub-clause 4.2.3.3.1 on page 42. The test procedure is the same as in sub-clause
4.2.3.3.3 on page 43, except for the geometrical test points, and that it is not needed to calculate the difference
between P 27RL and P 27BA . 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 27BA as a function of the position in four graphs, one for each quadrant.
Please observe the limitations of the test tool expressed in sub-clause 4.2.3.6.
4.2.3.8 Evaluation of Tele-powering Conformity in the Side Lobe Zone
Part 1 of this Norm specifies that the Balise shall be conform with the “Reference Field” in the Side Lobe Zone.
The Reference Field for the Tele-powering is defined in Part 1 of this Norm and recalled in sub-clause 4.2.3.6
on page 45. The result of the Balise measurements for the Tele-powering in sub-clause 4.2.3.7 on page 46 shall
be compared with the Reference Field. The tolerances for conformity are stated in Part 1 of this Norm to be the
same as for the Up-link, which means that the 27 MHz field needed to power the Balise may be from 5 dB below
the Reference Field up to ∞. See Figure 13
Contact zone
Side lobe
zone
Cross-talk
protected zone
Reference field
Reference Loop
response
5 dB
Minimum current needed
to activate Balise
35 dB
R0
Figure 13: Minimum current (27 MHz) needed to activate the Balise in the Side Lobe Zone