Operation Manual

Table Of Contents
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to Tx2 takes place.
a) Check that the text:
Auto ChgOver to TX2
appears in the event list.
Turn off Tx2 COU Mod 90Hz in the Modulation Switches window. Observe that the system
turns off.
b) Check that the text:
Auto ShtDown frm TX2
appears in the event list.
c) Check that measurement for PA 27V level < 1V in Maintenance Monitor Windows for
COURSE TX1 LPA/GPA and COURSE TX2 LPA/GPA.
Turn on Tx1 COU Mod 90Hz and Tx2 COU Mod 90Hz in the Modulation Switches window
again.
6.4 Annual inspections
Test Equipment
PC including NM7000 RMM program
NM3710 ILS Field Test Set, including attenuator 20 dB or 30 dB
Oscilloscope
Frequency counter 10 Hz to 350 MHz
RF Signal generator including calibrated ILS modulation
Digital voltmeter
Wattmeter with probe covering 328-336MHz, 10 watts.
•Stop watch
6.4.1 RF Frequency check.
Set the
AUTOMATIC/MANUAL switch to
MANUAL
and REMOTE/LOCAL to
LOCAL.
6.4.1.1 Course Transmitter Frequency
Switch on Course Tx1.
Connect the Frequency Counter to CSB Cou test connector in the Change Over Section
via a 50 ohm test cable. (Use 50 ohm input port of the counter)
If necessary switch off the 90 Hz and 150 Hz modulation through the Local Display and
Keyboard or the RMM Program.
Nominal frequency: (Channel frequency + 7.5kHz) ±0.002%
Repeat the measurements for Course Tx2.
Record the frequency readings in Table 6-11.
6.4.1.2 Clearance Transmitter Frequency
Switch on Clearance Tx1.
Connect the Frequency Counter to CSB CLR test connector in the Change Over Section
via a 50 ohm test cable. (Use 50 ohm input port of the counter)
If necessary switch off the 90 Hz and 150 Hz modulation through the Local Display and
Keyboard or the RMM Program.