Elenco Electronics MO-1251 Manual do Utilizador descarregar pdf (Página 67)

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resolve

its differences,

and

the

number of

solutions to

problems

far

outweighed those

that could

not

resolved immediately.

The IFRB publishes

the

submit-

ted information

in a book

called

the

Tentative

Schedule.

Continuing

conflicts,

such as two or

more broad-

casters

operating

the same

fre-

quency to the

same target

area can

easily

be identified, and

it's

then

up to

the broadcasters

concerned

solve

their problems.

In some cases,

the

IFRB

makes recommendations

for re-

solving conflicts,

but acceptance

the recommendations

not mandato-

ry; IFRB

a part

of the ITU.

Figure 1

shows an annotated

page from

a re-

cent

Tentative Schedule.

was

not

long

before

other broad-

cast

organizations

became aware

the

IFCC, and

requested

mem-

bership.

Radio Canada,

Radio

Nederland, and the

BBC joined

dur-

ing the

first several

years, and

the

Deutsche

Welle

entered

the group

'966.

Other

broadcasters

soon learned

he IFCC's activities

and

wanted to

join. One

representative

from a Far

Eastern broadcaster

traveled

6,000

miles to attend a

meeting as an

ob-

server,

then appealed

to the group

allow

his organization to

participate

the meetings. By that

time, how-

ever,

with about 400 transmitters

rep-

resented at

the meetings, and

conflicts

becoming

more and more

difficult to

resolve, the IFCC decided

that addi-

tional

participation

would prejudice

the effectiveness

of the group.

Still

other broadcasters

continued

trying to gain

admittance

to the IFCC

and

were

also turned

down. It

was

then that one

of the European

rejec-

tees referred

to the group

as "The

Club."

How the Club

Works

The Article 17 coordination

pro-

cedure

divides the broadcasting

year

into

four seasons:

Spring: The

first

Sunday

in March

to the first Sunday

in May.

Summer:

The first Sunday

in May

to the first Sunday in September.

Fall: The first Sunday

in September

to the

first Sunday in

November.

Winter:

The

first Sunday

November to the

first Sunday in

March

the following

year.

Approximately six months

before

the

start of a season, IFCC

members

send their

schedules to a designated

host,

who

records the

schedules

booklet,

which, when

complete,

con-

tains the combined

schedules

of all

the

participants.

Technical represen-

tatives of the

member broadcasters

travel

to the host city,

and

with

all the

representatives

sitting around a

con-

ference

table, the

host then reads

through

all frequencies,

from 5,955

kHz

26,095 kHz. Should a conflict

arise, the

reading stops until a

satis-

factory

solution

can

be found.

A total

of 375 frequencies are coordinated.

Each

schedule is coordinated

twice.

The first

reading

is made

six

months

advance

implementation

of the

schedule.

The final reading

about two

months before

a schedule is

due

to go into effect;

that takes

into

account any

modifications

to the

schedule that

must be

made because

programming or propagation

changes,

or because

of unexpected

interference problems

that

have arisen

since the original

submission

of the

tentative schedules.

IFCC meeting schedule

With

the

exception

the

FCC,

par-

ticipating

organizations

take turns

hosting

meetings.

The annual meet-

ing schedule, indicating

when each

schedule is coordinated,

is as follows:

January: The

final Spring schedule

is coordinated.

March: The final

Summer sched-

ule, plus the preliminary

Fall

sched-

ule.

May: Preliminary

Winter schedule.

July: Final Fall

schedule.

September: Final

Winter

schedule,

plus preliminary

Spring schedule

for

the following year.

November: Preliminary

Summer

schedule

for the following

year.

The IFCC

is unique in the

annals of

shortwave

broadcasting. It

has met for

over 25 years,

and in

spite

of the

fact

that the

shortwave bands are

over-

crowded

by a factor of

more than two,

and

that all participants are

in compe-

tition

for the same

scarce natural re-

continued

on page

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