IFR NAVAIR NAV-750

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NAVAIR

17-2OAX-737

4.7.25

Set

the

TI

LOC

DDM

switch

to

150

Hz.

4.7.26 Verify

that

the

signal

generator

calibrator

indicates

between

38.4%

and

41.6%

AM

modulation,

and

record

the

reading.

4.7.27 Verify

that

the

TI

meter

indicates

within

±1.6%

of

the

recorded

value

in

step

4.7.26.

4.7.28

Set

the TI

LOC

DDM

switch

to

0,

and

the

FREQUENCY

MHz

switches

to

118.000.

4.7.29

Activate

the

signal

generator

calibrator

50

HzHPFILTER,

and

the

15

kHz

LP

FILTER.

4.7.30 Verify

that

the

signal

generator

calibrator

indicates

between

28.8%

and

3

1.2% AM

modulation.

4.7.31

If

the

TI is a

NAV—750B,

proceedwithstep

4.7.32.

Otherwise,

if

the

TI

is

not

a

NAV—750B,

skip

to

step

4.7.41.

4.7.32

Set

the TI

controls

as

follows:

FREQUENCY

MHz

switches

to

075.000

MASTER

MOD

control

to

CAL

(UNCAL

lamp

off)

Meter

function

and

toneSelector

switch

to

400

Hz

1020

Hz

indent

tone

MOD

control

to

CAL

(UNCAL

lamp

off)

Output

attenuator

control

to

—20

dBm

4.7.33

Press

the

signal

generator

calibratorINSTR

PRESET

key

(Blue

key,

AUTOMATIC

OPERATION

key),

and

ensure

that

the

signal

generator

calibrator

is in

the

FREQ

measurement

mode

and

tunes

to

the

TI

FREQUENCY

MHz

switches

setting.

Set the

signal

generator

calibrator

for

AMmodulation

measurements

with

the

DETECTOR

set

to

PEAK

±12.

Activate

the

signal

generator

calibrator

50

Hz

HP

FILTER,

and

the

15

kHz

LP

FILTER.

4.7.34 Verify

that

the

signal

generator

calibrator

indicates

between

92.

15%

and

97.85%

AM modulation,

andrecord

the

reading.

4.7.35 Verify

that

the

TI

meter

indicates

within

±3%

of

the

recorded

value

in

step

4.7.34.

4.7.36

Set

the TI

meter

function

and

tone selector

switch

to

1300

Hz.

4.7.37 Verify

that

the

signal

generator

calibrator

indicates

between

92.

15%

and

97.85%

AM

modulation.

4.7.38

Set the

TI

meter

function

and

tone selector

switch

to

3000

Hz.

4.7.39

Activate

the

signal

generator

calibrator

300

Hz HPFILTER,

and

the

>20

kHz

LP

FILTER.

4.7.40 Verify

that

the

signal

generator

calibrator

indicates

between

92.

15%

and

97.85%

AM

modulation.

4.7.41

Disconnect

the

signal

generator

calibratorsensor

module

from

theTI.

17