Test Specification for Eurobalise FFFIS

Page 50 of 332
SUBSET-085, Issue 2.2.2
November 9, 2007
4.2.4.3 Balise Input to Output Characteristics Measurements
4.2.4.3.1 Test Configuration
A proposed test set-up is shown in Figure 15 below. Clause F1 of Annex F on page 287 gives an example of
suitable test equipment. If Power Meter 2 is substituted, by for instance a spectrum analyser, then the measurement
bandwidth of this device shall be 1.2 MHz. The filter (item 12), the Test Antenna (item 5) and the
4.2 MHz cables from the Test Antenna to the measurement point (i.e., the sensor head), shall be the same as in
the calibration procedure in sub-clause 4.2.4.2 on page 48. See also sub-clause 4.2.1 on page 23.
C.S.
27 MHz
4. Attenuator
Test Antenna 5.
P CS
Power
Meter 1
10.
3.
RF
Amplifier
12.
Filter
4.2 MHz
Balise
Interface ‘A’
2.
Attenuator
P 42
1.
Signal
Generator
Power
Meter 2
15.
Figure 15: Test set-up for Input to Output Characteristics Measurements
Please observe that it needs to be verified that 27 MHz suppression in Up-link signal measurements is sufficient
for achievement of the required accuracy. If not, additional filtering must be introduced (e.g., several filters in
cascade).