NAVAIR 17—2OAX—737
4.2 ATI’ENUATOR FREQUENCY RESPONSE TESTS
4.2.1 Connect the power sensor to the power meter. Zero and reference calibrate the power sensor and
power meter.
4.2.2
Set the TI attenuator to
—30 dBm. and the TI frequency switches to 108 MHz. Connect the power
sensor input to the TI RF output connector.
4.2.3 Set the power meter controls for auto ranging or —25 dBm range, as applicable.
NOTE
For that following tests, set the power meter calibration factor switch to the appropriate
setting corresponding to the power sensor cal chart at the test
frequency
(TI FREQUENCY MHz switches setting).
4.2.4 Verify that the power meter indicates between —28.5 and—31.5 dBm.
4.2.5 Set the TI FREQUENCY MHz switches to the following settings. At each setting, verify that the
power meter indicates within the tolerance limits listed.
TI
FREQUENCY MHz
Switch Setting
Power Meter
Tolerance Limits
(dBm)
115.000
125.000
135.000
145.000
157.000
—28.5
to
—31.5
“
“
“
“
4.2.6 Set the TI FREQUENCY MHz switches to 328.000.
4.2.7 Verify that the TI G/S Mode indicator is on, and that the power meter indicates between —28.5 and
—31.5 dBm.
4.2.8 Set the TI FREQUENCY MHz switches to the following settings.
At each setting, verify that the
power meter indicates within the tolerance limits listed.
TI
FREQUENCY MHz
Switch Setting
Power Meter
Tolerance Limits
(dBm)
330.000
332.000
335.000
—28.5
to —31.5
“
“
4.2.9 If the TI is a NAV—750B continue with step 4.2.10. Otherwise, if the TI is not a NAV—750B,
proceed to step 4.2.13.
4.2.10 Set the TI FREQUENCY MHz switches to 70.000.
4.2.11 Verify that the power meter indicates between —28.5 to —31.5 dBm.
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