,167$//$7,21 &200,66,21,1*+$1'%22.
1.2.2
RF Power
The CSB and corresponding SBO output power can be adjusted by means of the RMM Pro-
gram or the Local Display/Keyboard.
Normal operating power level is:
The output power can be read by means of the RMM Program or the Local Display/Keyboard.
1.2.3
LF Phase Adjustment
1.2.3A LF Phase Adjustment (One-frequency system)
Connect oscilloscope channel A to the BNC test connector labelled CSB located on LPA/
GPA Course 1 (2).
Set oscilloscope input mode to DC.
Adjust 150 Hz COU phase adj. R3 (LF1223A) observing oscillocope channel A until the
waveform equals left hand graph in Figure 1-2.
A significant indication of correct LF phase is that the pair of the intermediate peaks are equal
in amplitude.
Figure 1-3 shows the corresponding SBO waveforms for normal and 10º LF phase error
respectively.
1.2.3B LF Phase Adjustment (Two-frequency system)
Connect oscilloscope channel A to the BNC test connector labelled CSB located on LPA/
GPA Course 1 (2).
Connect oscilloscope channel B to the BNC test connector labelled CSB located on LPA/
GPA Clearance 1 (2).
Set oscilloscope input mode to DC. Select CHOP mode.
Adjust channel A and B gain so that both waveforms show the same amplitude.
By means of the RMM turn off 90 Hz modulation for Course Tx and Clearance Tx.
Adjust 150 Hz CLR phase adj. R180 to track 150 Hz Course waveform in the same phase
(waveform overlap).
LLZ Course
15 W CSB
LLZ Clearance
15 W CSB
GP Course
5 W CSB
GP Clearance
0.5 W CSB
Содержание NM 7000 Series
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