IFR NAVAIR NAV-750

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NAVAIR

17—2OAX—737

4.5.18

Use

the

oscilloscope

delayed

sweep

function

to

expand

the

portion

of

the

TI

signal

indicated

in

Figure

1,

with the

oscilloscope

delayed

time base

set

for

10

p.s/div.

such

that

the

display

is

similar

to

Figure

2.

Verify

that

the

deviation

of

the

expanded

display

corresponds

to

delta

time

(st)

=

48.5

p.s

±2.4

p.s.

Figure

2.

9960

Hz

Deviation

(Expanded)

4.5.19 Verify

that

the

electronic

counter

indicates

between

9958.008

and

996

1.992

Hz.

4.5.20

Adjust

the TI

9960

FM

tone modulation

control

to

UNCAL

[fully

ccw

(0)].

4.5.21

Setthe

TI

30

Hz

tone modulation

control

to

the

CAL

(UNCAL

lamp

off)

position.

4.5.22 Verify

that

the

electronic

counter

indicates

between

29.994

and

30.006Hz.

4.5.23

Setthe

TI

9960

FM

tone modulation

control

to

the

CAL

(UNCAL

lamp off)

position,

the

FREQUENCY

MHz

switches

to

118.000,

and

the

Meter

function

switch

to

OFF.

4.5.24 Verify

that

the

electronic

counter

indicates

between

1014.9

and

1025.1 Hz.

4.5.25

If

the TI is a

NAV—750B,

proceed

with

step

4.5.26.

Otherwise,

if the

TI

is

not

a

NAV—750B,

skip

to

step

4.5.32.

4.5.26

Set

the TI

FREQUENCYMHz

switches

to

075.000,

and

the

Meter

function

and

Tone

Selector

switch

to

400

Hz.

4.5.27 Verify

that

the

electronic

counter

indicates

between

397.2

and

402.8 Hz.

4.5.28

Set

the

TI

meter

function

and

tone

selector

switch

to

1300

Hz.

4.5.29 Verify

that

the

electronic

counter

indicates

between

1290.9

and

1309.1

Hz.

Deviation

13