VERIFICATION
IFR 4000
Subject to Export Control, see Cover Page for details. Page 12
Jun 1/11
(5) Harmonic and Spurious
TEST EQUIPMENT: Spectrum 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 the
IFR 4000 Maintenance Manual for corrective action.
STEP PROCEDURE
1. Connect the Spectrum Analyzer (Input) to the ANT Connector.
2. Press the SETUP Key to display the Setup Menu.
3. Set the PORT Field to ANT.
4. Press the MODE Select Key until the VOR Mode Screen is displayed.
5. Set the Test Set as follows:
FIELD SETTING
FREQ 108.000 MHz
RF LVL 0.0 dBm
MOD TONE OFF
M MOD 0%
6. Verify the harmonic is <-20 dBc and the spurious is <-35 dBc.
7. Press the MODE Select Key until the GLIDESLOPE Mode Screen is displayed.
8. Set the Test Set as follows:
FIELD SETTING
FREQ 334.700 MHz
RF LVL 0.0 dBm
M MOD 0%
9. Verify the harmonic is <-20 dBc and the spurious is <-35 dBc.
10. Press the MODE Select Key until the MARKER BEACON Mode Screen is
displayed.
11. Set the Test Set as follows:
FIELD SETTING
FREQ 75.000 MHz
RF LVL 0.0 dBm
MOD TONE OFF
M MOD 0%
12. Verify the harmonic is <-20 dBc and the spurious is <-35 dBc.
13. Press the MODE Select Key until the COMM AM Mode Screen is displayed.
14. Set the Test Set as follows:
FIELD SETTING
FREQ 137.000 MHz
RF LVL 0.0 dBm
MOD TONE OFF
M MOD 0%
15. If the COMM AM Mode Screen is in RECEIVING Mode, press the SWITCH
GEN/RX Soft Key to switch the COMM AM Mode Screen to GENERATING Mode.
16. Verify the harmonic is <-20 dBc and the spurious is <-35 dBc.