AEG Electrolux ERN 2922 User Manual download pdf (Page 14)

Communications

Installin

Cellular

Mobile

Phones

A guide

the cellular

connection

vehicles

By Art

Salsberg

ellular telephone

technology

has made

on-

the

-road communication

in many

areas

the

U.S. and

Canada convenient

and afford-

able. As

result,

many people

make

their

vehicles

extension of their

office

with

the

aid of this modern

communications

system,

well

use it to make

per-

sonal phone

calls

while

"on the road."

Almost

one -million people

are

said to now

avail

themselves

of this

service,

with

growth

to three

-mil-

lion

anticipated by 1990.

Cellular telephone

service is

still

very

young.

started

only

in 1984,

Washington,

DC,

and spread

quickly

metropolitan

areas across the

country . . .

and is

still expanding.

Other mobile

telephone

sys-

tems

existed before

cellular systems were

introduced,

of course,

and still

serve

well

(and more

expensively)

the many areas

still not

set up for

cellular service.

Aside from lower

cost, you

might ask what's

spe-

cial about

cellular systems?

There

are

many

things.

With

previously

developed

mobile

phone

systems,

there is

a severely limited

number

call channels.

Consequently,

there's

often

waiting

list

just

to get

one

of these mobile

phones. They're

usually

support-

ed by a single, powerful

transmitting

/receiving

cen-

tral

station that

extend

one's communications

range

to,

perhaps, 25 miles.

The farther

you

get from

the

strong

signal area, however,

the

weaker

and noisier

the signal gets.

These mobile

units

are larger in

size

than cellular

types, too. In

contrast,

cellular

phones

are

supported by

large

number

of smaller

transmit-

ter /receiver

centers, called

"cells." Actually,

they

can

likened

to a bevy

of switching repeaters

that

are tied into

a central station.

As one leaves

a cell

reception

area,

moving

into

area

where

reception

/transmission is weaker,

ad-

joining

cell

picks

up the service in

about 2/ 100ths

of a

second,

thereby maintaining

full

signal strength.

Though

depicted graphically

as hexagonal,

so that

one can see

where

a cellular area

ends and another

be-

gins,

the reception

/transmission

area is

actually cir-

cular,

with

some overlap,

of course. The

beauty of a

cellular

system is that phone

communications

can

continue

when

driving into

another

cellular system

area that's serviced

by a different

central transmit-

ter /receiver

company. This

is called

"roaming."

Many

companies have

shared agreements

to service

subscribers in

one area

when

they drive into

another;

with

others, you may have

to make

arrangements to

be serviced. How

do you know when

you've left your

home

area? A "roam"

indicator

on your

cellular

phone lights

up, thereby alerting you.

Cellular phone

systems

aren't

the perfect

answer

mobile

communications,

naturally.

Firstly,

they

don't

come cheap,

costing at least

a thousand

dollars

with

installation

in most

instances.

You

can

save

$100

so, though,

installing

the phone

by your-

self; maybe

more,

depending

on the area

you live in

and the

dealer you

buy your phone

from.

Also, there

are some

areas

with

hills

and dales that

might

cause

pockets of reception

fade

-out. Further, you

pay for

incoming

calls for the

service between your

phone

and

the

cells used as

well

as for outgoing

calls. And

lastly, you

incur

an additional phone

bill in

the sense

of paying

a base

access

charge as

well

as connect

time, which

the time you start

accessing the

central

switching

equipment, not

the time you

actually make

a connection with

the

party you

wish

to talk to.

Nevertheless,

the cellular phone

system is a great

convenience.

Brightening

the cellular mobile

phone

system's horizons

further is

the

fact

that each

cellular

service area must be

set up

with

two systems

that one

can

choose

from.

One is

local

telephone

company

wireline

carrier,

while

the

other competitor is

non -wireline

operator

which won

the territory

bid,

18 / MODERN

ELECTRONICS

/ February

1988

Say You

Saw It In Modern

Electronics

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 79 80

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