IFR NAVAIR NAV-750

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NAVAIR

17—2OAX—737

NOTE

For

the

following

tests, set

the

spectrum

analyzer

frequency

span

and

center

frequency

controls

as

necessary

to

check the

level

of

the

harmonics

of

the

TI

signals.

4.14.4

Set

the TI

FREQUENCY

MHz

switches

to

the

following

settings. At

each

setting,

verify

that

the

harmonics

(using

thespectrum

analyzer

tuned

to

the

TI

frequencies

and

its

harmonics)

of

all

the

selected

TI

frequencies

are

~30

dB

below

the

carrier

level.

TI

FREQUENCY

MHz

Switches

Setting

108.000

115

.000

130.000

145.000

157.000

4.14.5

Setthe

TI

FREQUENCY

MHz

switches

to

329.000.

4.14.6

Set

the TI

FREQUENCY

MHz

switches

to

the

followingsettings.

At

each

setting,

verify

that

the

harmonics,

(using

thespectrum

analyzer

tuned

to

the

TI

frequencies

and

its

harmonics)

of

all

the

selected

TI

frequencies

are

~30

dB

below

the

carrier

level.

TI

FREQUENCY

MHz

Switches

Setting

329.000

332.000

335.000

4.14.7

Setthe

TI

FREQUENCY

MHz

switches

to

070.000.

4.14.8

Set

the TI

FREQUENCY

MHz

switches

to

the

followingsettings.

At

each

setting,

verify

that

the

harmonics

(using

thespectrum

analyzer

tuned

to

the

TI

frequencies

and

its

harmonics)

of

all

the

selected

TI

frequencies

are

20

dB

below

the

carrier

level.

TI

FREQUENCY

MHz

Switches

Setting

070.000

075.000

079.000

4.14.9

Setthe

TI

FREQUENCY

MHz

switches 334.700 MHz.

4.14.10

Setthespectrum

analyzer

for

a

frequencyspan

of

5

kHz/div,

the

resolution bandwidth

to

300

Hz,

the

video

bandwidth

to

10

Hz,

and

the

reference

level

and

positioncontrols

as

necessary

for

a

single—sideband

noise

measurement

at

±20

kHz

from

the

TI

334.700

MHz

carrier

frequency.

4.14.11

Verify

that

the

single—sideband

noise

level is~74

dB

below

the

carrier

level.

25