IFR NAVAIR NAV-750

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NAVAIR

17—2OAX—737

4.13.16

Verify

that

the

harmonic

spurious

noise

is

75

dB

below

the

carrier

level at

±12.5

kHz

from

the

TI

108.000

MHz

carrier

frequency.

4.13.17

Verify

that

the

harmonic

spurious

noise is

83

dB

below

the

carrier

level at

±25.0

kHz

from

the TI

108.000

MHz

carrier

frequency.

4.13.18

Set

the

TI

frequency

switches

to

334.700

MHz.

4.13.19

Verify

that

the

harmonic

spurious

noise is

66

dB

below

the

carrier

level at

±12.5

kHz

from

the

TI

334.700

MHz

carrier

frequency.

4.13.20

Verify

that

the

harmonic

spurious

noise

is

77

dB

below

the

carrier

level at

±25.0

k}iz

from

the

TI

334.700

MHz

carrier

frequency.

4.13.21

Set

the

spectrum

analyzer

for

a

frequency

span

of

10

kHz/div,

the

resolution bandwidth

to

300

Hz,

the video

bandwidth

to

300

Hz, and

the

attenuator

and

position

controls

as

necessary

for

a

single—sideband

noise

measurement

at

±100

kHz

from

the

TI 334.700

MHz

carrierfrequency

as

stated

in a

1

kHz

resolution

bandwidth.

NOTE

When

converting

300

Hz

bandwidth

data

to

1

kHz

bandwidthdata,

subtract

5.23 dB

from

the

300

Hz

bandwidthdata.

4.13.22

Verify

that

the

broadband

noise is

82

dB

below

the

TI

334.700

MHz

carrier

level.

(See

the

note

prior

to

this

step.)

4.13.23

Setthe

TI

frequency

switches

to

108.000

MHz.

4.13.24

Setthespectrum

analyzer

for

a

frequency

span

of

10

kHz/div,

the

resolution bandwidth

to

300

Hz,

video

bandwidth

to

300

Hz,

and

the

attenuator

and

position

controls

as

necessary

for

a

single—sideband

noise

measurement

at

±100

kHz

from

the

TI

108.000

MHz

carrierfrequency

as

stated

in a

1

kHz

resolution

bandwidth.

4.13.25

Verify

that

the

broadband

noise

is

82

dB

below

the TI

108.000

MHz

carrier

level.

(See

the

note

prior

to

step

4.13.22.)

4.13.26

Disconnect

thespectrum

analyzer

from

theTI.

4.14

SPECTRAL

PURITY

TESTS

(NAV-750B

ONLY)

4.14.1

Setthe

TI

controls

as

follows:

FREQUENCY

MHz

switches

to

070.000

MASTER

MOD

control

to

UNCAL

[fully

ccw

(0)]

Output

attenuator

control

to

—10

dBm

4.14.2

Connect

thespectrum

analyzer

input

to

the

TI

RF

output

connector.

4.14.3

Setthespectrum

analyzer

for

a

frequency

span

of

100

MHz/div

with

a

3

MHzresolution

bandwidth.

24