CT Systems Wavetek 2500 - Page 31

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Hand-off

and

Measure

RF

Frequency

Error

This

manual

test

is

used

for

testing

cellular

telephone

hand-off,

and

RF

frequency

error.

The

Model-2500

displays

the

current

voice

channel

in

use,

along

with

an

RF

frequency

error

measurement.

The

frequency

error

measurement

is

displayed

in

kilohertz,

and

indicates

the

cellular

tele-

phone's

frequency

error

with

respect

to

the

current

channel

in

use.

This

allows

for

monitoring

the

frequency

accuracy

of

the

cellular

telephone

transmitter.

This

test

also

allows

for

manual

control

of

voice

channel

hand-off

to

any

valid

voice

channel

by

entering

a

four

digit

number

that

corresponds

to

a

hand-off

channel,

and

then

pressing

the

"ENTER"

key.

As

the

new

hand-off

channel

is

entered,

it

will

be

displayed.

When

the

"ENTER"

key

is

press-

ed,

a

hand-off

instruction

will

be

transmitted

to

the

cellular

telephone

by

the

Model-2500,

and

the

new

voice

channel

will

be

displayed.

When

all

frequency

error

and

hand-off

tests

have

been

completed,

press

the

"DOWN

ARROW"

key

to

proceed

to

the

next

selection

in

the

manual

test

flow

chart.

DTMF

Encoder

Test

This

test

is

designed

to

test

the

DTMF

encoder

on

the

handset

of

the

cellular

telephone.

Press

the

DTMF

keys

on

the

cellular

telephone,

and

verify

that

the

keys

pressed

are

now

displayed

on

the

Model-2500

VF

dis-

play.

When

all

DTMF

keys

have

been

tested,

press

the

"DOWN

ARROW"

key

to

proceed

to

the

next

selection

in

the

manual

test

flow

chart.

Mobile

Hook-flash

Test

This

test

is

designed

to

verify

proper

operation

of

the

"HOOK-FLASH"

function

in

a

cellular

telephone.

The

hook-flash

consists

of

a

400ms

burst

of

signalling

tone

from

the

cellular

telephone.

Execute

this

test

by

pressing

the

hook-flash

switch

on

the

handset

of

the

cellular

tele-

phone.

If

the

hook-flash

is

detected

by

the

Model-2500,

an

indication

will

be

displayed.

When

the

hook-flash

test

is

complete,

press

the

"DOWN

ARROW"

key

to

proceed

to

the

next

selection

in

·

the

manual

test

flow

chart.

Receiver

Sensitivity

Test

During

this

test

the

transmit

carrier

from

the

Model-2500

is

modulated

with

a

1000

Hz

tone

plus

SAT

at

a

deviation

level

of

14

kHz.

Manual

control

of

the

RF

generator

output

level

is

possible

by

using

the

"RF

LEVEL"

button,

and

adjusting

the

front

panel

RF LEVEL

vernier

on

the

Model-2500.

Manual

control

of

the

RF

generator

can

be

used

for

testing

receiver

sensitivity.

Pressing

the

"RF LEVEL"

button

on

the

Model-2500

front

panel

will

change

the

range

of

the

RF

generator

output

level

as

indicated

by

the

RF

Level

LEOs

next

to

the

front

panel

vernier.

Please

2500-MANUAL

PAGE

19

SECTION-3