User Manual

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Table Of Contents

ADCP-75-126 • Issue B • April 2002 • Section 4: Operation

Page 4-13

©

2002,

ADC

Telecommunications,

Inc.

4. Place

the

RF

ON/OFF

switch

on

the

LPA

in

the

ON

position.

5. Measure

the

RF

level

of

a

single

carrier,

such

as

the

control

channel,

in

dBm.

Make

sure

the

resolution

bandwidth

of

the

spectrum

analyzer

or

power

meter

is

narrow

enough

to

measure

the

power

of

the

single

30

kHz

channel

only.

6. Calculate

the

total

composite

signal

power

using

the

following

formula:

P

tot

=

P

c

+

10Log

N

–

(see

Note)

Where,

P

tot

is

the

total

composite

power

in

dBm

P

c

is

the

power

per

carrier

in

dBm

as

measured

in

step

2,

and

N

is

the

total

number

of

channels.

7. Record

the

result

calculated

in

step

6.

8. Place

the

RF

ON/OFF

switch

on

the

LPA

in

the

OFF

position.

9. Disconnect

the

spectrum

analyzer

or

RF

power

meter

from

the

STM

ANTENNA

port.

10. Re-connect

the

antenna

cable

to

the

STM

ANTENNA

port.

2.7 Enter Remote Forward Attenuation

The

STM

internal

forward

path

attenuator

setting

is

used

to

increase

or

reduce

the

power

level

of

the

composite

output

signal

level

at

the

STM

antenna

port.

The

maximum

composite

output

signal

level

at

the

STM

antenna

port

is

set

using

the

Host

internal

forward

attenuator

(see

Section

2.4).

However,

component

variations

may

result

in

the

output

power

at

the

STM

antenna

port

being

slightly

above

or

below

the

required

power

per

channel.

If

this

is

the

case,

the

STM

forward

attenuator

may

be

used

in

conjunction

with

the

Host

forward

attenuator

to

add

or

remove

attenuation

to

produce

the

required

output

signal

level.

If

less

power

is

required,

the

STM

forward

attenuator

may

be

used

to

reduce

the

power

level.

The

default

setting

is

0

dB.

Use

the

following

procedure

to

change

the

STM

forward

attenuation:

1. Click

on

the

REMOTE

LPA

tab.

The

REMOTE

LPA

display

will

open

within

the

EMS

main

window

as

shown

in

Figure 4-10.

Note:

Subtract

16.23

if

calculating

the

composite

power

for

a

CDMA

system.

Note:

To

comply

with

Maximum

Permissible

Exposure

(MPE)

requirements,

the

maximum

composite

output

from

the

antenna

cannot

exceed

1000

Watts

EIRP

and

the

antenna

must

be

permanently

installed

in

a

fixed

location

that

provides

at

least

6

meters

(20

feet)

of

separation

from

all

persons.