Nagra III - Input and Output Ports

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5

The

recording

amplifier

when

on

IITestingl1

The

play-back

amplifier

on

"Record"

"Automatic

Record"

and

"Play-back

and

Batt.

Meter

" .

The

line

amplifier

on

"Hi-Fi

Play-back"

The

normal

output

level

is

approximately

250

mY.

One

can

use

this

output

to

connect

the

Nagra

to

an

external

power

amplifier.

A 1

arm

S i g n a 1 .

This

signal

is

injected

between

the

lower

socket

of

the

monitoring

output

and

earth,

when

the

motor

speed

stabiliser

reaches

the

bottom

of

its

range,

that

is,

during

fast

rewind

and

in

case

of

exhaustion

of

batteries

or

accidental

braking

of

the

motor.

If

one

uses

this

output

for

connection

to

a

power

amplifier,

the

alarm

signal

can

be

quite

annoying.

In

order

to

avoid

this,

one

connects

the

external

amplifier

between

the

earth

on

the

line

input

on

the

right

side

of

the

apparatus,

and

the

upper

socket

of

the

monitoring

output.

14)

a.

Line

Input

This

input

is

at

high

impedance

and

one

can

connect

it,

for

instance,

to

a

radio

receiver

to

record

a

transmission.

The

input

impedance

is

100.000

ohms

and

the

normal

level

0,

5

volt.

b,

Accessory

Socket

The

corresponding

plug

is

a

Tuchel

T.

3400.

The

connections

are

shown

on

the

surrounding

label

as

follows:

1.

o

Batteries

taken

direct

to

the

negative

of

the

internal

battery.

This

can

b p

used

for

recharging

internal

accum

ulators

if

they

are

employed

in

place

of

batteries.

2.

o

Earth

=

the

positive

of

the

battery

is

connected

to

earth.

3.

o

Line

This

line

input

is

similar

to

the

line

input

mentioned

above

but

the

impedance

is

2500

ohms

and

the

normal

level

8

mY.

This

is

for

use

with

the

Nagr

a

accessories

such

as

external

m

ic

rophon

e

pr

earn

plifi

e

r.

4.

o

Stop

connection

for

remote

control

-

if

reconnected

to

earth

the

motor

will

stop.

5.

o

External

=

This

is

the

connection

for

the

negative

of

an

external

power

supply.

The

a

pplied

voltage

should

be

between

12

and

24

volts

DC

and

must

not

exceed

25

volts.

6.

o

-10.5V

regulated

voltage

for

supply

of

accessories.

c)

Balanced

Output

This

line

output

is

symmetrical

and

floating.

The

characteristics

are

marked

on

the

label:

with

a

load

not

less

than

600

ohms

4,

4 V

(+

15

db)

0 r

" "

" "

"

100

ohms

1,55

V

(+

6

db)

a

At

this

socket

the

following

signals

will

be

found:

During

testing

and

recording.

the

signal

applied

to

the

recording

head.

One

should

not

load

these

sockets

during

this

operation.

(Except

when

a

DH

amplifier

is

used).

During

Play-

back

&

Batt.

Meter

the

signal

feeding

the

with

reduced

reserve

of

the

level.

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