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4.3.2
Clearance SBO power
Switch off the course transmitter.
Insert the 90°-stub in the CLR SBO path. Connect the Field Test Set to the BNC test connec-
tor TEST 1 (antenna 13 sample) in the ADU. (Use 20...30 dB attenuator at the Field Test Set
I/P).
Switch on the clearance transmitter. Adjust the CLR SBO attenuator in the cabinet (associ-
ated with Tx to air) until a reading of 36% DDM is obtained.
Carry out the same procedure for the other transmitter.
4.3.3
DDM field check
Set the localizer to normal radiation (clearance transmitter on). From the centreline of the
opposite threshold determine points perpendicular to the CL 105 meter to both sides of the
runway. Use the NM3710 with portable antenna and measure DDM at these points. The read-
ings should be close to -15.5% at the 90-side and 15.5% at the 150-side. However, some
unsymmetry may be expected due to reflections and tolerances in the antenna system.
Check the CL DDM at two or three positions in order to estimate an average value.
Expected value: 0.0%
±
0.2% DDM.
4.4
Monitor combining unit (MCU) adjustments
4.4.1
Course Line
Connect the Field Test Set to the CL output connector of the MCU.
Adjust the CL line stretcher to obtain 0.0% DDM.
4.4.2
Course Sector
Connect the Field Test Set to the CS output of the MCU.
Adjust the CS line stretcher to obtain a reading of 15.5% DDM.
4.4.3
Clearance
Connect the Field Test Set to the CLR output connector of the MCU. Adjust the CLR line
stretcher to obtain a reading of 27% DDM.
4.5
Near field monitor adjustments
The exact position of the near field monitor antenna cannot be determined until after the flight
check is completed, due to possible mechanical re-alignment of the antenna array.
4.5.1
Mechanical alignment
Align the near field (NF) monitor antenna mechanically in the extended runway centreline
position.
Содержание NM 7000 Series
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