Broadcast Electronics 3000 Series - Page 134

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THE

NAB

TAPE

CARTRIDGE

The

National Association

of

Broadcasters

(NAB)

defines

a

cartridge

as ''a

plastic

or

metal

enclosure

containing

an

endless loop

of

lubricated

tape,

wound

on

a

rotatable

hub

in such a fashion

as

to

all

ow

continuous motion."

Cartridges

from

the various manufacturers

differ

slightly

in

details,

but

all

cartridges

usable in

NAB

standardized

systems

fit

the preceeding

definition.

THE

TAPE

Cartridge

tape

consists

of

a

synthetic

base

material

approximately

l

mil

(0.001 inch)

thick.

One

side

of

the

base

is

coated with

ferric

oxide

particles

for

magnetic

recording.

The

other

surface

is

coated with a

graphite

layer.

The

total

thickness

of

the

tape

is

approximately

1.5

mils (0.0015

inch).

The

tape

is

0.246

:J:0.002

inches

wide.

CARTRIDGE

TAPE

0 . .:35

MIL

OXIDE

COATING

I

Ml

L

POLYESTER

BASE:

0.15

MIL

GRAPHITE:

COATING

The

endless

loop

is

formed

by

wrapping

the

tape with

the

oxide

side

out

into

a

spiral.

The

two

ends are

spliced

together

so

that

as the

tape

is

pulled

from

the

center,

it

passes

across

the tape heads

and

winds back onto

the

outside

of

the

tape

spiral.

TAPE

IRAVE.L.

TAPE

SPIRAL

THE

SHELL

The

shell

holds the

tape

and

other

parts.

There

are

three

standard

sizes

of

shells:

A (Broadcast

Electronics

300

series),

B (600

series),

and

C (1200

series).

Assuming

1.5

mil

tape,

the

type A

cartridge

can

be

loaded with

up

to

395

feet

of

tape,

the

B with

up

to

650

feet,

and

the C with

up

to

1250

feet.

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