Elenco Electronics MO-1251 Manual do Utilizador descarregar pdf (Página 66)

72

SHORTWAVE

RADIO

International Frequency

Coordinating

Committee

50

kH

65

STANLEY LEINWOLL

- 6150

kHz

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17

to

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6150

kHz

3'7. ROU

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FREQUENCY

TIME

TRANSMITTER

POWER

300I8ESTI

4: 337.32. 16

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c2î.

COUNTRY

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18

0831

AUT

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INTERFERENCE

BEARING AND ANTENNA

CHARACTERISTICS

---------___

RQ

181CUREST

250x 28505. 17 d8

c2

27

TRANSMITTER LOCATION

1

TARGET

AREA

TIME

OF

OAY

DURING

WHICH INTERFERENCE

OCCURS

ONE OF THE MOST IMPORTANT, INFLUEN-

tial, yet

little

-known

organizations in

the field of shortwave broadcasting

is

the International Frequency Coordi-

nating Committee (IFCC),

which

is

also known as

"The Club."

The IFCC is made up

of high -level

technical representatives of

the Voice

of America (VOA),

Radio Free Eu-

rope (RFE) and

Radio Liberty (RL),

the

British Broadcasting Corp.

(BBC), Radio Germany (Deutsche

Welle),

Radio Canada International,

Radio

Nederland, and the

Federal

Communications

Commission

(FCC),

which represents some

sixteen

private U.S. broadcasting

organiza-

tions,

such as

WYFR,

KGEI,

KTWR,

WINB,

and

others. The

IFCC

meets six times

yearly to coor-

dinate their shortwave-

broadcast

schedules.

FIG.

1

IFCC history

Roger Legge

was

the father of Arti-

cle 17 of the International Telecom-

munication Union

(ITU)

Radio

Regulations; that was a revolutionary

coordination procedure, under

which

all shortwave broadcasting organiza-

tions submitted their schedules six

months in advance of

implementation

to the

International Frequency Regis-

tration

Board

(IFRB).

In force since

1960, Article

17

has had a

major im-

pact

on shortwave

broadcasting,

en-

abling broadcasters to resolve

con-

flicts before a tentative

frequency

schedule

was

implemented.

At that time, Legge

noted

that U.S.

broadcasters

were submitting

sched-

ules that

were in conflict

with each

other. He

suggested that U.S. broad-

casters,

VOA, RFE, RL, and the

FCC

meet periodically to resolve

their con-

flicts before submitting schedules

to

the

IFRB.

The U.S. broadcasters

ac-

cepted

the proposal and, in

1963, at

the suggestion

of Roger Legge, then

frequency manager

of VOA, the

IFCC

was

born.

Tentative Schedule

The early IFCC meetings

were

very

difficult,

sometimes acrimonious;

when a conflict arose,

a

change

had to

be made to resolve

it. One of the

broadcasters

must either move to

an-

other frequency, or change charac-

teristics such

as antenna bearing

or

transmitter

location, in order to

make

interference -producing

conflicts

tech-

nically compatible.

That

was

not al-

ways

easy,

or even possible. Conflicts

over a single frequency

sometimes

lasted a full day.

However, even

from

the

start, the group

worked

together

to

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