NAVAIR 17—2OAX—737
4.5.30 Set the meter function and tone switches 3000 Hz.
•
4.5.31 Verify that the electronic counter indicates between 2979.0 and 3021.0 Hz.
4.5.32 Disconnect the electronic counter and the oscilloscope from the TI.
4.6 TONE DISTORTION TESTS
4.6.1 Set the TI controls to the following positions:
FREQUENCY MHz switches to
LOC-G/S frequency switch to
BEARING-FREQ switch to
MASTER MOD control to
9960 Hz FM tone MOD control to
1020 Hz indent tone MOD control to
30 Hz tone MOD control to
LOC DDM switch to
G/S DDM switch to
Meter function switch to
108.000
LOC
FREQ
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
CAL (UNCAL lamp off)
0
0
0-100 or OFF
4.6.2 Connect the distortion analyzer input to the TI rear panel 30 Hz REF jack. Set the distortion
analyzer controls for distortion measurement of a 30 Hz fundamental, as applicable.
4.6.3 Verify that the distortion analyzer indicates ~0.5% total harmonic distortion.
4.6.4 Set the TI FREQUENCY MHz switches to 108.100, and set the G/S DDM switch to 90 Hz.
4.6.5 Disconnect the distortion analyzer from the 30Hz REF jack, and connect it to the TI rear panel
TONES jack.
4.6.6 Set the distortion analyzer controls for distortion measurement of a 90 Hz fundamental, as
applicable.
4.6.7 Verify that the distortion analyzer indicates ~0.4% total harmonic distortion.
4.6.8 Set the TI LOC—G/S frequency switch to G/S.
4.6.9 Verify that the distortion analyzer indicates 0.4% total harmonic distortion.
4.6.10 Set the TI G/S DDM switch to 150 Hz.
4.6.11 Set the distortion analyzer controls for distortion measurement of a 150 Hz fundamental, as
applicable.
4.6.12 Verify that the distortion analyzer indicates ~0.4% total harmonic distortion.
4.6.13 Set the TI LOC—G/S frequency switch to LOC.
4.6.14 Verify that the distortion analyzer indicates 0.4% total harmonic distortion.
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