IFR NAVAIR NAV-750

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NAVAIR

17—2OAX—737

4.14.12

Set

the

TI

FREQUENCY

MHz

switches

to

108.000.

4.14,13

Set

the

spectrum

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

108.000

MHz

carrier

frequency.

4.14.14

Verify

that

the

single—sideband

noise

level

is

78

dB

below

the

carrier

level.

NOTE

Setthespectrum

analyzer

frequency

span

and

center

frequency

controls

as

necessary

to

perform

the

tests

of

the

TI

harmonic

spurious

noise.

4.14.15

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.

4.14.16

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.

4.14.17

Set

the

TI

frequency

switches

to

334.700 MHz.

4.14.18

Verify

that

the

harmonic

spurious

noise

is

~75 dB

below

the

carrier

level at

±12.5

kHz

from

the

TI

334.700

MHz

carrier

frequency.

4.14.19

Verify

that

the

harmonic

spurious

noise is~83 dB

below

the

carrier

level at

±25.0

kHz

from

the

TI

334.700

MHz

carrier

frequency.

4.14.20

Setthespectrum

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

positioncontrols

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.

4.14.21

Verify

that

the

broadband

noise

is

80

dB

below

the

TI

334.700

MHz

carrier

level.

(See

the

note

prior

to

this

step.)

4.14.22

Set

the

TI

frequency

switches

to

108.000

MHz.

4.14.23

Set

the

spectrum

analyzer

for

a

frequencyspan

of

10

kHz/div,

the

resolutionbandwidth

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

108.000

MHz

carrierfrequency

as

stated

in

a

1

kHz

resolution

bandwidth.

4.14.24

Verify

that

the

broadband

noise

is

~80

dB

below

the

TI

108.000

MHz

carrier

level.

(See

the

note

prior

to

step

4.14.21.)

4.14.25

Disconnect

thespectrum

analyzer

from

theTI.

26