Specifications

EMC-CS-2009.1
© Copyright Ford Motor Company – All Rights Reserved Page 43 of 121
February 11, 2010
11.6.2 Test Procedure
Prior to testing, calibration of test setup shall be performed using a similar procedure to that delineated in Annex B of
ISO 11451-3-2006. During calibration, the antenna shall be positioned such that its radiating elements are a minimum
distance of 500 mm from any absorber material and 1000 mm from any object such as the DUT, the ground plane, antenna
cable, and the test enclosure wall. This setup is illustrated in Figure 11-6.
The net power levels specified in Table 11-4 are based on the measured forward and reverse power. per the following
equation:
REFLmeasFWDmeasNETant
P
A
PAP
,,,
1
⋅−⋅=
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
=
FWDmeas
FWDant
P
P
A
,
,
Where:
P
ant, NET
= the NET power, specified in Table 11-4, that is delivered to the antenna
P
meas, FWD
= the FOWARD power, measured at the directional coupler
P
meas, REFL
= the REFLECTED power measured at the directional coupler
A = the cable attenuation (A< 1)
Figure 11-6: RI 115 Setup for Calibration
6
5
4
5
1 2
3
> 500 mm
> 500 mm
> 1000 mm
> 1000 mm
P
cal, FWD
P
cal, REFL
7
Key:
1. Signal Generator
2. RF Amplifier
3. Directional Coupler
4. RF Power Meter
5. Peak Envelope Power Sensor
6. Spectrum Analyzer (may be used as an alternative to the power
sensor)
7. Test Antenna: (Schwarzbeck antenna SBA9113 with elements
420NJ )
Although not required prior to each test, the test laboratory shall make periodic checks of the antenna's VSWR to
verify that it has not changed from the manufacturers published specifications.