
MAINTENANCE MANUAL
IFR 4000
2-2-3
Page 25
Aug 1/04
(11) Localizer
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
108.100 MHz
RF LVL
10.0 dBm
MOD TONE
1020 Hz
M MOD
CAL
DEV STEP
FIXED
LOC DDM
0.000 CENTER
TONE DEL
90 & 150
7. Verify 1020 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 30% AM
(
±
2% AM) on the Modulation Analyzer.
8. Set the Test Set as follows:
FIELD
SETTING
MOD TONE
OFF
TONE DEL
150
9. Verify 90 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 20% AM
(
±
2% AM) on the Modulation Analyzer.
10. Set the TONE DEL Field to
90
.
11. Verify 150 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 20% AM
(
±
2% AM) on the Modulation Analyzer.
DDM ACCURACY
12. Set the Modulation Analyzer to DDM.
13. Set the Test Set as follows:
FIELD
SETTING
TONE DEL
OFF
90/150 Hz
OFF
Содержание IFR 4000
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