IFR NAVAIR NAV-750

NAVAIR 17—2OAX—737
SECTION 4
CALIBRATION PROCESS
NOTE
Unless otherwise specified, verify the results of each test and take corrective action
whenever the test requirement is not met,before proceeding.
4.1 FREQUENCY ACCURACY TESTS
4.1.1 Set the TI controls as follows:
FREQUENCY MHz switches to 108.000
MASTER MOD control to UNCAL [fully ccw (0)]
Output attenuator control to —20 dBm
4.1.2 Ensure that the TI 0 LOCK indicator is on.
4.1.3 Connect the electronic counter to the TI RF output connector,and set the electronic counter for
frequency measurements, as necessary.
4.1.4 Adjust the TI output attenuator control, if necessary, to obtain a stable electronic counter
indication. (Repeat this step, if necessary, for the following tests of the TI frequency accuracy.)
4.1.5 Verify that the electronic counter indicates between 107.999892 and 108.000108 MHz.
4.1.6 Set the TI FREQUENCY MHz switches to 130.000, and verify that the electronic counter indicates
between 129.999870 and 130.000130 MHz.
4.1.7 Setthe TI FREQUENCY MHz switches to 157.000, and verify that the electronic counter indicates
between 156.999843 and 157.000157 MHz.
4.1.8 Set the TI FREQUENCY MHz switches to 328.000, and verify that the electronic counter indicates
between 327.999672 and 328.000328 MHz.
4.1.9 Set the TI FREQUENCY MHz switches to 335.000, and verify that the electronic counter indicates
between 334.999665 and 335.000335 MHz.
4.1.10 If the TI is a NAV—750B, proceed with step 4.1.11. Otherwise, if the TI is not a NAV—750B, skip
to step 4.1.13.
4.1.11 Set the TI FREQUENCY MHz switches to 070.000, and verify that the electronic counter indicates
between 69.999930 and 70.000070 MHz.
4.1.12 Set the TI FREQUENCY MHz switches to 079.000, and verify that the electronic counter indicates
between 78.999921 and 79.000079 MHz.
4.1.13 Disconnect the electronic counter from theTI.
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