MAINTENANCE MANUAL
IFR 4000
2-2-3
Page 28
Aug 1/04
(12) Glideslope
TEST EQUIPMENT:
Modulation
Analyzer
VERIFICATION FAILURE:
If any step in this procedure fails or is out of tolerance,
this indicates a failure in the Test Set. Refer to
Troubleshooting for corrective action.
STEP PROCEDURE
1. Connect the Modulation Analyzer (RF Input) to the ANT Connector.
2. Set the Modulation Analyzer to AM Measurement.
3. Press the SETUP Key to display the Setup Menu.
4. Set the PORT Field to
ANT
.
MODULATION FREQUENCY, DISTORTION AND DEPTH ACCURACY
5. Press the MODE Select Key until the LOCALIZER Mode Screen is displayed.
6. Set the Test Set as follows:
FIELD
SETTING
FREQ
334.700 MHz
RF LVL
10.0 dBm
M MOD
CAL
DEV STEP
FIXED
90/150 Hz
OFF
TONE DEL
150
7. Verify 90 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 40% AM
(
±
2% AM) on the Modulation Analyzer.
8. Set the TONE DEL Field to
90
.
9. Verify 150 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 40% AM
(
±
2% AM) on the Modulation Analyzer.
DDM ACCURACY
10. Set the Modulation Analyzer to DDM.
11. Set the G/S DDM Field to the following settings and verify readings on the
Modulation Analyzer:
LOC DDM
READING
0.000 CENTER
0.000 (
±
0.003 DDM
0.091 UP
0.091 (
±
0.003 DDM +
±
3% of setting)
0.091 DOWN
0.091 (
±
0.003 DDM +
±
3% of setting)
0.175 UP
0.175 (
±
0.003 DDM +
±
3% of setting)
0.175 DOWN
0.175 (
±
0.003 DDM +
±
3% of setting)
0.400 UP
0.400 (
±
0.003 DDM +
±
3% of setting)
0.400 DOWN
0.400 (
±
0.003 DDM +
±
3% of setting)
Summary of Contents for IFR 4000
Page 1: ...NAV COMM Test Set Maintenance Manual 1002 5600 4P0 IFR 4000...
Page 3: ...MAINTENANCE MANUAL IFR 4000 FOR QUALIFIED SERVICE PERSONNEL ONLY...
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Page 166: ...MAINTENANCE MANUAL IFR 4000 2 3 1 Page 6 Aug 1 04 STEP PROCEDURE 4 Remove the Fuse...
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