Nagra IV-SJ Service Manual

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• TAPE/DIRECT, LINE&PHONES: switching of the playback signal o~ of
the direct signal on the line outputs, headphones and loudspeaker; switch
inactive on TEST

• TAPE/DIRECT, METER: switching of the playback signal or of the direct

signal on the circuit of rIleter 14; this switch cannot be locked on TAPE

• POWER: power selector switch i.e. built-in batteries or accumulators or

external power supply connected to plug 48

• Main function switch

STOP: recorder at • standstill
TEST: power sopplied to all circuits, except record and erase

RECORD: power supplied to all circuits and the motor; record and erase on

the 3 tracks
PLAYBACK: the recorded signal can be heard on the headphones and is fed
to the line outputs of connectors 41, 42,43,45 and 46 when switch 1 is on
TAPE (or on DIRECT if the output signal is reintroduced into the direct
chain. see 42)
PLA YBACK with Loudspeaker: playback of tape using loudspeaker

LIGHT; meter 14 lights up momentarily: remains illuminated when the

button is turned to the right

•

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Main attenuator CHANNEL 2: in steps of 10 dB for channel 2,Iower track

• Vernier attenuator CHANNE L 2; in steps of 1dB for channel 1

• Main attenuator CHANN.E L 1: in steps of 10 dB for channel I, upper track

• Vernier attenuator CHANNE L 1: in steps of 1 dB for channel 1

dB scale: for the microphone inputs, in relation to the sound pressure

level 0.OOO2pbar=0 dB
voltage scale; effective voltage applied to the line input, which gives a reading
of OdB on the AVERAGE scale of meter 14

REF. OSCILLATOR: switched on when the button is depressed, the
reference oscillator supplies a +10 dB signal to the direct amplifier on each

channel, after the attenuator

•

LINE/MIKE: line or microphone input selector, channel 2

LINE/MIKE: line or microphone input selector, channell

•

FI LTERS: 6-position filter selector switch for channell:

•

HP high·pass
L1N. linear

•

WE IGHTING A, B, C, D weighting curves A, B, C and D

METER FUNCTION: six-position selector switch for meter 14
lEVEL. AVERAGE FAST: on the AVERAGE decibel scale, average value

of the sound level, fast characteristic, red needle for channel I, green needle

for channel 2
lEVEL. AVERAGE SLOW; the same as AVERAGE FAST, but slow

characteristic

LEVEL, PEAK: on the PEAK decibel scale, peak value of the sound level,

channels as above
BATT.: on the BATTERIES scale, battery or accumulator check

Red needle: battery voltage per cell (VOLTS/CELL)

Green needle: voltage required by the motor, with the same reduction factor
as battery voltage
PILOT8o CUE:
Green needle: on the PILOT 0 to 100% scale, overall frequency deviation
caused by the pilot and CUE signals, 100% on the scale corresponding to a

deviation of ±40%

Red needle: on the PILOT +4 to -4% scale, frequency shift, as determined by
the built-in OFMS frequency meter, between a signal recorded or played back

on the third track and an internal reference

Position M:

Green needle: same as PILOT&CUE
Red needle: on the 0 to 100% scale, current through the motor, 100% on the
scale corresponding to 250 mA

Fll TERS: filter selector switch for channel 2. identical to II

CD

Meter: indicates sound level and checking functions according to the position

of selector switch 12

•

• PILOT: indicator which shows a white lone when frequency and amplitude

of the pilot signal are correct

SPEED&POWER: indicator which shows a white lone when the following
three conditions are fulfilled:

- power supply voltage higher than the maximum admissible value

- motor regulation within the correct operating range
tachometric speed fluctuations not exceedinq the maximum value

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PHONES: connector for mono headphones, impedance 25 to 600n

• CHANNEL, PHONES&L.S.: channel selector for listening with headphones
and loudspeaker

• LEVEL, PHONES: adjustment of the headphones volume

• Tape speed selector switch

• BIAS: 5'position bias selector switch

• Pinch-wheel

IS"=38.1 cmls

7'/,"

=

19.05cm/s

6)Fast wind switch:

REW.

• Supply reel

• Tension roller of the supplV reel

• Erase head

•• Stabilizer roller with 50 or 60 Hz stroboscope

• Recording head tracks 1 and 2

e.

Recording and playback head track 3

•• Playback head tracks 1 and 2

CD

Capstan

• 3'position lever controlling the pinch-wheel and tape guicles:

. - lever pulled to the left: for threading the tape (rewind possible in this

position)

- lever at 45° to the edge of the tape-deck: motor running, but tape not

moving

- lever pushed backwards: tape running

•• Tension roller of the take-up reel

• Take·up reel

3% .•=9.525 cm/s
1

'h"

=

3.81 ·cm/s

rewind with main switch 4 in any position
except STOP, lever 32 in disengage position

fast wind when main switch 4 on

PLAYBACK with Loudspeaker

6)RECORDING EOUALIZA TION ADJUSTMENT

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Direct analysis of sound signals
Used solely as an amplifier the NAGRA IV-SJ is a

precision sound level meter, which operates with
any calibrated microphone cartridge. The sound
pressure measurements must be taken in relation to

the

0

dB reference level, which corresponds to a

pressure of 0.0002 ubar, i.e. 20
This level coincides in practice with the audibility
threshold of the human ear at
quency, the sound level can be expressed in phones,
the phones value being equal to the dB value read
in relation to the 0.0002 /-Ibarreference.

'.The frequency response of the human ear is not

linear and depends very much on the sound level; a
sound level meter must therefore include weighting
filters which modify the values measured in accor­dance with certain criteria, so that they can be

interpreted in relation to the subjective impression
felt by the human ear. There are three standard
weighting curves, A, Band C. Curve A is used for

low and medium sound levels, which are the sub­ject of most analyses; curves Band C relate to

higher levels. Curve D relates to contour-lines of·

perceived noisiness, in particular with noise pro-

duced by aviation: this weighting is used for the

measurement of sounds which cause annoyance

in general. Curves A, B, G and D are shown after

the specifications.

The sound level measured is shown on a dual

galvanometer. with one needle per channel. Its

measuring circuit determines the average value of

the signal on RMS and its peak value on

PEAK, with different dynamic characteristics in
relation to the integration time. On RMS
FAST integration time is 200 ms: a signal at
lasting 200 ms gives a reading

which would correspond to the steady signal. On

RMS SLOW, integration time is 500 ms and
a signal lasting 500 ms gives a reading 4 dB below

that which would correspond to the steady signal.

These two integration times are in accordance with

J.lN/m2or 20 J.lPa.

1 kHz; at this fre-

1 kHz

1 dB lower than that

INSTRUCTION MANUAL

I

the GEl standard 179 for
meters. Naturally, any signal which is shorter than
the integration time will be shown below its real
value. For analysis of pulse signals or strong
transients a more useful reading is obtained on
PEAK, i.e. peak value with an integration time of

5

only
because it causes visual fatigue: in order to over­come this disadvantage the measuring circuit holds
the signal for about one second, thereby increasing
the fall time of the needle.

Recording and playback of the sound signals

In all cases where direct. measurement is not
sufficient for studying the signals picked up by the
microphone, these signals can be recorded on mag­netic tape and analyzed later in the laboratory.
While the two tracks used for direct recording are
in use, the third track

synchronization, a commentary, or a measuring­signal from D.C. up to 4 kHz. The three tracks
thus store signals in fully-synchronized form, which
is an important factor for analysis.

However, this storage is restricted to some extent

due to the limitations of present magnetic tapes.

These limitations concern the following charac-

teristics in particular:
the response curve

Attenuation at the upper and lower extremes of
the spectrum depends on the speed used. Very low
frequency signals, which are difficult to play back
with a small reproduce head, should be analyzed
by frequency transposition.

distortion

This increases very rapidly as soon as the maximum

recording level is exceeded, and tape saturation

occurs, generating harmonic frequencies (in

ticular 2nd and 3rd harmonics), which falsify the

analysis of the signals.

ms. This very fast reading cannot be used

Measurements

precrsion

C'IO

record F M signals for

sound level

par

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crosstalk
The juxtaposition of the two channels inside the
recording head and the playback head produces
crosstalk. This is the ratio, at a playback amplifier
output. between the wanted signal and the unwan­ted signal from the other channel. Crosstalk
increases at high frequencies.

The maximum peak level, which corresponds to a
tape flux of 32 mM/mm, is reached when the

measuring instrument shows

RMS scale and +20 dB on the PEAK scale.

These two values are given in relation to the sound

·pressure reference level 0 dB

0.0002J.1bar.
On RMS the integration time of the

measuring circuit is long enough not to indicate
short pulses at their exact value and risk exceeding
the maximum recording level, thereby saturating
the tape. That is why, on RMS , the maxi-

+

10

mum level is given at
the signals with strong pulse content saturating the
tape too Quickly.

In all cases where the nature of a signal is not
obvious it should be recorded with the measuring
circuit on PEAK, which is the only way to make
the peak value of very short pulses visible and to
avoid their exceeding the maximum recording level.

Frequency transposition
Playback speed may be different from recording

speed: this produces a frequency transposition of
the signals recorded within the ratio of these two
speeds. Since the response curve in the low fre­quencies is limited to
possible, if the tape transport speed is ten times
faster on playback than on recording, to play back
frequencies which are ten times. lower. Thus, a

2.5 Hz signal recorded at 1.5 ips will have a fre·

quency of

(transposition
conventional equipment. In the same way, the
time needed to analyze signals which vary very
slowly is reduced in the same ratio by this process.
Conversely. it is possible to analyze in more detail
a signal which varies rapidly by playing it back

more slowly than it was recorded. However, in
both cases, care must be taken that the transposi­tion does not alter the signals in any way, taking

into account the limitations of the frequency res-

ponse at the speeds used.

25 Hz if it is played back at 15 ips

1: 1

0), and can be analyzed easily by

dB: the10dB lead avoids

25 Hz on playback only, it is

+10 dB on the

=

20 pPa or

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Maximum frequency deviation t>fo
Frequency response at

Signal-to-noise ratio for deviation
of ±20%

Peak-to-peak input voltage for deviation of ±20

PILOT

CUE 2.0 V

-3 dB

o

to 4 kHz

±45%

44dB

2_8 V

%

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OPERATING CONDITIONS
Temperature

with manganese batteries

with external power

The recorder functions correctly in any position.

- 4to+160°F

-20to+ 71°C

-67 to +160

-55 to

+

0

71 °C

F

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]

1

dB

+10

-10

-20

-30

-40

-50

Wei21

ht'

0

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V

curve

/

A

Ffequency lEe Recommendation 179

/

./

./

.•...•.

!'-..

<,

10000
'2500

'6000 - 6.6 +3
20000

Rt'I.tI~

Respome

H,

20
25

31,5

40

SO

63

80

'00
'25
'60

200
250
3'5

"""

500
630

800
1000
1250

1600 + I
2000
2500

3150
4000 + 1

5000
6300

8000

dB

·50.5

-" •. 7

-39.4

-34.6

-30.2

-26.2

-22.5

-'9.1

-16.1

-13.4

-10.9

- •. 6

- 6.6

- ".8

- 3.2

- 1.9

- O.S

.•. 0.6

+ 1.2
.• 1.3

+ 1.2

-+

- 0.1

-1.1

- 2.5

- 4.3

- 9.3

0

0.5

Tolrnn~

limitl

dB dB

,.

••

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oJ

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±3

12

11

t'

.,

.,

11 11
11

11

±,

.,

.,

±1

"

"

.,

"

et
et

!.1.S
+1.5

+1.5
+2

+3 -6

+3

N"GRAIV.sJ

-2

-3

..

_M

_M

Toler.nee

lImln

!3
:!:2.S

.,

.

.,
.,

t2
11,5

t,

11
11

l'

.,

t,

11

11
11

11

11

et

11

.,
.,

11

11

.,

%1.5

11.5

11.5
1:1.5
t2

Hz

20

80

50 100 315

31,5

200

500

1000 3150 8000 12500

800

1200

5000 10000

20000

dB

+10

-10

-20

-30/

-40

-50

Wet21 n2

hti

0

./

/

/

V

20

Hz

31,5 50

80

./

100

»>

curve

~

200

B

500 1000

315

800

-r---.

.•...•.

8000

3150

12500

1200 5000 10000

<,

20000

frequency

H,

20
25

31.5
40 -14.2

SO

63

eo

100
120

ISO

200
260
316

"""

600
830

800

, GOD

1260

1e00
2000
2500

3160

4000
6000

8_
8000

10000
12500

18000

20000

tEe Aecommmdation 1N

A.I.live

Response

Toleranoe

limits

d8

·242

-20.4

-17.1

-u.s

- 9.3

- 7.4

- 5.e

- 42

- 3

- 2

- 1.3

- D.e

- 0.5

- 0.3

- 0.1

- O.t

- D.2

- 0."

- 0.7

- 12

o

-a

- 4."

- 6.1

- 8.4

-11.1

_.-._--------_.

0
0
0

0

1.8

dB dB

••

15
13 12

03
03

03

12

., .,

.,

"

.,

11

.,

11 11

.,

.,

tI

at

.,

.,

"

.,

11 11

"

.11.5
.1.5

1-t.fI

'2
+3
+3
+3

NAGAAIV·SJ

-2

-3

-4

-6

--

--

To~nlnce

limite

12
12

12
t2

12
:1:1.6

11

"

et

"

11

.,

11
11

11

.,

.,

11
11

11

11

.,

.11.5
i1.6

11.6

il,6

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---

r

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2.4. Connection of Brliel&Kjaer Amplifiers fitted
with Brliel

&

Kjaer Microphone Cartridges

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B&K

CARTRIDGE

~

The following types of cartridges

- 'h";4133,4134,4149and4163

- 1 ";4144,4145,4146and4161

- 1,4";

- 1/8";

can be fitted to the following types of preamplifiers:

- 1",

- '12

- 1",

- 1" : 2627, 2612 and 2613

- 1,4",

The cartridges can be fitted directly onto the pre­amplifiers when the diameters match; if they do not
match, a mechanical adapter can be used. The
output plug of the preamplifier screws into the
OSJP adapter and the plug of the preamplifier
adapter fits into microphone connector

10 should be on MI KE.

The recorder should be fitted with the QSJA-BK
microphone amplifier and the QSJC universal power
supply. These circuits can be installed as described
in the preceding paragraph,

4135 and 4136

4 138

1/2",

1,4" :

",1,4 ",

1/8" :

'12",

1,4",

1/8" :

%" : 2618

B&K

PREAMPLIFIER

261 5
2614
2619

37:

selector

---1

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=-=1

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2.5. Connection of Sennheiser MKH 110 Measuring

Microphone

The MKH 110 microphone consists of a capacitor
cartridge and an electronic circuit with a low impe­dance output; microphone sensitivity is 2 mV

It should be connected to microphone connector

37

by the QCJ-MKH cable; selector 10 should be on

MIKE_

The recorder should be fitted with the QSJA-MKH
microphone amplifier, which also supplies the vol-·
tage for the microphone.

Installation of aSJA-MKH Amplifier
Lock the lid of the recorder, turn screws 50 several

times and open the case to its full extent. Unscrew
the connector between the microphone input wiring
and the case interconnection board. Plug in and fix
this connector to the microphone amplifier and
secure the latter to the case interconnection board.
Unscrew the level adapter board. Place the shield
in position and fix it under tile ground comb and
under a nut screwed onto one of the two hinge
fixing screws (this screw should be longer - M3x8).

Reinstall the level adapter board.

IMbar.

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Signals and Voltages
Chassis connector external side or plug soldering

side

+200Y

+120V

r -

L_

-10G

,-----r-GND

+12,6V

Signals and Voltages
Chassis connector external side or plug soldering

side

~--..,.-- GNO

SIGNAL

-8Y------

-10G----~

,

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3. DIRECT MEASUREMENT OF SIGNALS

3.1.

Position of the Controls

Set switch 1 on DIRECT: switch 2, which cannot
be locked in position, remains on DIRECT. Turn
main selector switch 4 to TEST: the circuits are
then switched on and will stabilize after about 10
seconds.

3.4.3. Low·level Signals on the Microphone Input
QSJA-BK AMPLIFIER
With selector

7A

on0dB

Turn the cartridge type selector 40 to the position
which corresponds to the diameter of the cartridge
used. On
become +40. +60 and +90dB, values inscribed in a

circle.

10

on MIKE, set vernier attenuator

1f.t ••

the positions of gain selector 39

3.2. Selection of Measuring Circuit
Set the METER FUNCTION switch on one of the

LEVEL positions:

- RMS FAST : average valu~ of the sig·
nal on the RMS' scale of meter 14,
integration time 200 ms.

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- RMS SLOW : average value of the
signal on the same scale, but integration
time 500 ms.

- PEAK: peak value of the signal, on the
PEAK scale of meter 14, integration time
5 ms, with a memory circuit holding the

signal for about

The measuring circuit of the recorder should be

selected in accordance with the criteria given in

Section

3.3. Adjustment of the Monitoring Circuit
The signals can be monitored on the headphones

with switch

loudspeaker on PLAYBACK with Loudspeaker
(see 6.).

The mono headphones, impedance 50 to 600

plug into jack 17. The required channel can be
selected with switch
by potentiometer
screwdriver.

3.

4

in any position and with the built-in

1 second.

18

and the loudness regulated

19,

which can be adjusted with a

n.

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3.4.

Choice of Sensitivity

3.4.1.

I

Set selector 10 on LINE, turn main attenuator 7
fully to the left, or on GND, set vernier attenuator

7A on 0 dB (CAL.),

High·level Signals on the Line Input

I

Switch on the signal source connected to the line
input. While watching meter 14, turn main attenua­tor 7 to the right until the red needle makes a
visible movement. Calculate the value measured as
described in paragraph 3.6.1.

3.4.2. High-level Signals on the Microphone Input

Same procedure as in the preceding paragraph, but

with selector

10

on MIKE.

Turn attenuator
If the needle moves noticeably beyond +20 dB
PEAK or +10 dB RMS , turn switch 39 to
+80 dB. If the needle is clearly below 0 dB, turn
switch 39 to +40 dB. Calculate the value measured

and take into account the restrictions described in

paragraph

QSJA-MKH AMPLIFIER

This amplifier has no gain selector or cartridge type
selector. The sensitivity can be determined by main
attenuator

AMPLIFIER FOR GENERAL
RADIO MICROPHONE

The amplifier for use with the GENERAL RADIO
microphone is the QSJA-BK; please refer to the
above instructions for using this amplifier.

3.5. Choice of Filter
When filter selector switch 11 is on LlN, the

quency response of the direct chainislinear at
:to.3 dB from 2.5 Hz to 35 kHz. Selector switch
should be set on one of the following positions
according to the kind of measurements being taken:

HP: high-pass filter, attenuation

WEIGHTING A, B, C, D: weighting of the

The HP position should be used systematically when
the measurement of signals is not extended to very
low frequencies: in fact, since these are inaudible,
they are likely to falsify results and, in some cases,
saturate the amplifiers. Furthermore, this position
eliminates very low frequency noise from the car­tridge itself.

The weighting positions A, B, C and D are used, in
the case of noise measurement, to obtain a value
corresponding to the subjective impression felt by

the human ear (see Section 1).

7 to +20 dB and watch meter 14.

3.6.3.

7

only.

fre-

3

dB at

20 Hz, 12 dB per octave

frequency response as determined by
international standards, the exact value
of which is given at the end of the section
entitled Specifications.

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The arrowhead opposite the +40 dB position on
attenuator
restrictions must be observed in order to avoid
saturation of the input circuits, when measurements
are taken by microphone, preamplifier and ampli-

fier.
The performance of the microphone cartridges and

input amplifier circuits is restricted by the occur-

rence of saturation phenomena which are produced
when the sound level measured becomes very high.
These phenomena may be detected by a trained ear

if measurements are being taken and monitored
simultaneously (see
exposed acoustically to the sound source. If the
phenomena pass unnoticed the measurement will
be incorrect. The only sure way to avoid saturation
and its consequences is to impose a limit on the

attenuator which directly follows the input cir­cuits; when the attenuator is at this limit, any sound
signal which makes the needle of meter
to the right to its fullest extent, saturates the input
circuits and cannot be measured. In this case, the
amplifier gain must be reduced by turning its selec-

tor from +40 dB to +60 dB or from +60 dB to

+80 dB; if saturation still occurs on this position it

means that the output level of the transducer used

is too high. A less sensitive transducer should then
be used or an attenuator inserted between the trans­ducer and the preamplifier.

7

is to remind the user that certain

3.3.).

and if the operator is not

14

deviate

3.6.3.1. Limits and Corrections with theOJPA
Preamplifier and

Same as below

G (preamplifier gain) same as for Brtiel
2619 preamplifier.

3.6.3.2.

When main attenuator
at +40 dB, there is no risk of saturation as long as
the needle of meter
+20 dB PEAK, with gain selector 39 on +40 or
+GOdB; when the latter is on +80dB (+90 dB fora
~" cartridge), the main attenuator may be set
beyond the +40 dB position as saturation then
depends only on the cartridge used and the corres­ponding preamplifier.

With cartridge type selector
corresponding to the cartridge used, the sound level
is obtained by direct reading when the potentio­meter of the QSJP adapter is adjusted to a correc­tion value K, given in dB by the following relation:

limits and Corrections with Brfiel
Kjaer Preamplifiers and the QSJA-BK

Amplifier

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K=Ko - G - X

Ko==open circuit correction factor given by

the manufacturer

G

==

preamplifier gain in relation to the

type of cartridge and its mechanical

adapter given by the manufacturer

X difference between the typical sen-

sitivity of the cartridge and the

50 mV/N/m1reference value, in accor-

dance with the following table:

OSJA-BK Amplifier

7

is opposite the reference

14

does not move beyond

40

in the position

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Kjaer

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Type of
cartridge

X

in dB

*With the 1/4" cartridge 4136, 8 dB must be added

to the calculated value to obtain the sound level

takes into account the adjustment range limits of

the QSJP adapter).

**

Cartridge type selector 40 on 1/4 ": add 12 dB to

the calculated value to obtain the sound level.

Example

Ih"

cartridge 4133 with preamplifier 2619:
Ko=+12.2dB G=-O,4dB X=+12dB
Value to which the potentiometer of the QSJP

adapter shou Id be adjusted:

1"

K

=

'12 "

+12

0

12.2+0.4 - 12=+O.6d8

1,4 ••

4135 4136*

+22

'14"

+30

I/~"

4138"

+34

(X

t

p"-

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4. RECORDING OF SIGNALS

4.1. Choice of Tape
It is essential to use the type of magnetic tape for

which the recorder was adjusted at the factory; it is
only in this way that the values indicated in the
technical specifications {Section 2) can be obtained.

It is possible to use another type of tape by reo

adjusting the bias, equalization and recording level

. The performance obtained may

differ from the values shown in the test report

issued with each recorder; it is necessary to check

the results obtained with a new tape before using
the recorder for taking accurate measurements.

The positions of bias selector switch 21 correspond
to steps of 10%.

The length of the recording to be made is also a
determining factor in choosing the tape speed.
Place speed selector 20 on the position correspond­ing to the wanted speed; the speed can be switched
while the tape is running without damaging the
recorder.

4.3. Threading the Tape
Pull lever 32 forward to its fullest extent. Place a

full reel on the left-hand spindle (24) and fix it in
position with the knurled nut; place an empty reel
on the right-hand spindle (34) and fix it in position.

Lower the head shield. Unwind the tape slowly

from the supply reel arid thread it across the two

tension rollers 25 and 33 to wind it onto the take-up

reel; turn this reel a few times to that the tape is
pulled taut

J

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,

4.2. Speed Selection
The tape speed should be selected in relation to the

upper and lower limits of the frequency response:

at 15"/s (38 cm/s) : 25 Hz to 35 kHz ±1 dB
at 7.5"/s (19 cm/s) : 25 Hz to 20 kHz ±1 dB
at 3.75"/s (9.5 cm/s): 25 Hz to 10kHz ±1 dB

±

at 1.5"/5 (3.8 crn/sl: 25 Hz to 3.5 kHz

At 1.5"/s recording is possible from 2.5 Hz, with
playback by transposition (see 4.8).

When the tape speed is being selected recording

equalization should also be taken into account; this
is higher for low speeds and may cause tape satura­tion when the signal frequency is high, even if the
modulometer shows the recording level to be
correct (see 4.7.2. Restrictions).

1dB

:w:

••••

o •

Push lever 32 backwards to its fullest extent. Raise
the head shield.

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which is similar to the distribution spectrum of the
spoken word and of music - was used as the basis
for an inverted curve which determi nes the possible
pre-emphasis. For the three higher speeds, emphasis
and de-emphasis conform to the recorder standard
(mentioned in the test report and marked on plate

51).

For the

I
I

ticular for recording very low frequency signals to
be played back by transposition at
emphasis has been calculated in relation to compati­bility for playback at

The emphasizing of signals during recording in
accordance with the standards has the advantage of
making it possible to play back the tapes on any
conventional recorder. On the other hand, this
process has one disadvantage: the frequencies
affected by emphasis are likely to cause tape
saturation, even if the recording level indicated on
meter 14 is correct. In fact, emphasis occurs in the
recording amplifier, i.e. after the measuring circuit,
which cannot under any circumstances indicate it.

Pre-emphasis depends on the tape speed: the lower
the speed the higher the treble emphasis will be.

Furthermore, the NAB standard also requires bass
pre-emphasis which, however, should not exceed
6

dB at the lower limit of the recording frequency
response. Treble pre-emphasis therefore pre­dominates and, to avoid saturating the tape, high
frequency signals must be recorded below the
maximum recording level (+20 dB PEAK). Taking
into account the difference between the NAB and
cel R standards, ifarecording is made at 6 dB
below the maximum level, i.e. at +14 dB PEAK,
there is no risk of saturation, as long as the signal
frequency is not higher than:

20

kHz for the

14 kHz for the 7.5" speed

5 kHz for the 3.75" speed

2.5

kHz for the

Since the pre-emphasis curve shows a rise of about

6 dB per octave. it is possible to calculate the pre-
emphasis value at a different frequency and deduct
the recording level reduction in relation to the

+20 dB maximum peak level.

1.5"

speed, which is used in par-

15"/5.

15"

speed

1.5"

speed.

15"

Is,

the

which means that noise inherent to the recording is
60 dB below the maximum recording level: this
level is reached when meter 14 indicates +20 dB
PEAK and, as gain selector 39 is on +40 dB, the

60

dB difference brings the noise level produced

during recording to 0 dB, i.e. to the 2.10- 5 Nlm
reference level. For the 40 dB signal the signal-to­noise ratio would also be 40 dB, therefore clearly
higher than the 10 dB signal-to-noise ratio obtained
with the cartridge and the input circuits used.

I

n practice, whi Ie the signal . of the
transducer and input circuits is below
noise level does not increase when the signal is
recorded. On the other hand, as soon as the sound
level reaches 100 dB, the signal must be kept as near
as possible to the maximum recording level in order

to obtain the highest possible signal·to-noise ratio.

To record, set main selector switch4on TEST;
allow the circuits to stabilize for about t~n seconds,
then

switch to RECORD: the tape begins to run.

4.7.4. Tape Monitoring during Recording

When main selector4is on TEST, the di rect signal

is present at the line outputs 43 and headphones

output

selector

When selector
DIRECT, it is again the direct signal which is
present at the outputs; but, if switch 1 is on TAPE,
the recorded signal is immediately played back and
will be present at the line and phones outputs.

Switch 2 fulfils the same function for meter 14,
which indicates the direct signal on DIRECT and
the playback signal on TAPE; this switch springs
back automatically to DIRECT.

TAPE/D IR ECT switches 1 and 2 make it possible
to check the quality of the signal during recording;
any audible or visible deterioration of the signal
indicates a false manoeuvre or defect.

17

according to the position of track

18.

4

is on RECORD and switch1on

60

dB, the

2

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,

4.7.3.

When gain selector 39 is on +40 dB and attenuator

7 on 0, maximum amplification can be obtained.

It

meter 14 then shows -10 dB, which is the limit of
readability. These signals are very weak, but can
nevertheless be recorded as such without decreasing
the signal·to-noise ratio of the cartridge and input
circuits. Thus, by using a BrLiel&Kjaer 4133

cartridge with its preamplifier and QSJP adapter,

the weighted noise level is 30 dB; with a 40 dB
signal the signal-to-noise ratio is 1OdB.

signal-to-noise ratio is always higher than 60 dB,

Signal·to·noise Ratio

is possible to measure signals at about +30 dB;

In the record/playback mode, the weighted

4.8. Frequency Transposition

Playback of signals recorded at a very low frequency
is difficult because of the smallness of the

NAG RA
of the frequency response of the amplifiers. To
analyse signals withafrequency between
and 35 Hz, set the speed selector 20 on

1.5"=3.81

meter function selector 12 on RMS SLOW
this position gives a more accurate reading than

RMS FAST and PEAK, which have too

rapid a characteristic.

Playback is at

(see 6.).

IV -SJ

playback head and the lower limit

crn/s, the filter selector

15"=38.1

em/s

in the usual way

11

on LI N. and

2.5

Hz

6.3. Interpretation of the Recorded Signals
It is necessary to fix a reference during recording

so that, when the recorded signals are analysed,
the exact value of the sound level can be
determined.

I

6.3.1. Written or Recorded Reference

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Before recording is begun, the position of the micro­phone amplifier gain selector
attenuator
or7A) should be noted on the recording data sheet,
or dictated on the third track using the QSCM
microphone. On playback, with METER switch 2
and LINE
will indicate the same value as during recording
and the output voltage will be in proportion to the
meter reading. If the tape is analysed on the recor­der itself, it is sufficient to add, in the usual way,
the value shown by the meter to the attenuator
and gain selector readings, which were taken during
recording. If analysis is done with the recorder
connected to exter.nal analysing equipment, the out·
put voltage can be compared with the 0 dB
references given in paragraph 6.1., thus making it
possible to determine the fraction of the sound
level given by the meter reading and to calibrate
the equipment. Finally, if analysis is done on a
recorder other than the NAGRA IV-SJ, the same
fraction of the sound level will be deducted from
the tape flux, the 0 dB meter reading corresponding
to 32 nWb/m on the tape.

In all cases, the position of the attenuators and that
of the microphone amplifier gain selector must be
known in order to determine the sound level at the
time of recording.

The accuracy of the meter reading on playback
depends on the quality of the tape used; even if it
is the kind of tape for which the recorder was
adjusted, the difference between the reading on
TAPE and on DIRECT may reach 2dB.

6.3.2. Recorded Internal Reference Signal

This method is more rapid and more accurate, but

still requires written notes or commentary on the

third track; it can be used to eliminate the playback

level inaccuracy due to the dispersion of the charac-

teristics of a tape of the same type. The reference

·generator built into the recorder applies a calibra­tion signal to the output of the direct amplifier,
without passing through the attenuators. When the
microphone amplifier gain selector and the
attenuators are adjusted to obtain a correct record­ing, the reference signal must be recorded at the
beginning of the tape and note taken of the sound

level to which it corresponds. This signal will be
used on playback for finding the sound level again
by conversion.

(6 or 7) and the vernier attenuator (6A

&

PHONES switch 1 on TAPE, meter 14

(38 or 39), the main

Example: the gain selector of the microphone
amplifier is on +60 dB, the main attenuator on
+30 dB and the vernier attenuator on 0 dB; record

the reference signal: the meter shows +10 dB; the

reference signal therefore corresponds to a sound

=

level of 60 + 30 + 10

the equipment will be calibrated at +100 dB when

the reference signal is played back.

6.3.3. Recorded External Signal Reference

An acoustic signal with a known sound level can be

used as a reference during recording. The B

pistonphone supplies a 250 Hz signal at 124 dB

±O.2

dB, and the B &Kcalibrator a 1 kHz signal at

94 dB ±0.3 dB.

Insert the microphone into the sound source and
check the calibration of the recorder by trying to

obtain a deviation on the meter between 0 and

+10 dB, then record this signal noting the position
of the microphone amplifier gain selector and that

of the attenuators. On playback this signal will

rep resent a reference at +124 or +94 dB.

If the signal to be analysed is at a very different

sound level, after calibration has been checked, the
gain selector and the attenuators must be reset in a

position which allows correct recording, and the

positions noted again. On playback the level of the

recorded reference signal no longer corresponds to
+124 or +94 dB; it should be calculated by adding

the difference in decibels between the first and

second reading to these values.

Example: the gain selector is on +80 dB, the main
attenuator on +40 dB and the vernier attenuator
on 0 dB; using the pistonphone, the reference signal

will be indicated at +4 dB (80 + 40 + 0 + 4

+124 dB) and recorded. The signal to be ana lysed

must be recorded with the gain selector on +60 dB,
the main attenuator on +30 dB, the vernier
attenuator on 0 dB, and it gives a reading of +10 dB;

its level is therefore 60 + 30 + 0 + 10=+100dB.
Attenuation indication for the reference signal:

80 + 40 + 0=120 dB

Attenuation indication for the signal to be analysed:

60 + 30 + 0
Difference: 90 - 120=-30 dB
Apparent level of the reference signal on playback:

124 - 30=+94 dB

=

+100 dB. During analysis

&

90 dB

K

=

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INSTRUCTION MANUAL

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Batteries and Accumulators

I

4

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The NAGRA IV-SJ or IV-SJS has space for .12

1.5 V cells (nominal voltage). Batteries conforming

I

to CE I (e.g. R20 type) or ASA (e.q. D or L90 type)
standards are suitable; their diameter should not
exceed 1
ween 21

The central electrode is positive and the can
negative, with a few exceptions; polarity is generally
shown byEBandesigns. If the batteries do not fit
securely in the box, the cells can be packed with
cotton wool, which will prevent them from pro­ducing unwanted noise while the recorder is in use.
If the batteries are too short and do not produce
the required contact, nickel or bronze (not alu­minium) coins can be inserted between the cells. A
mechanical adapter is available for use with NAGRA

recorders; this can be fixed to the contacts when
cells shorter than the minimum length are used
consistently.

1. Power Supply Voltage

New carbon-zinc batteries supply a total voltage of

18 V. The recorder will still function correctly
with 12 V at 15 ips (38 cm/s) and 11 V at the three

low speeds, when it is in perfect condition and wor-

king at a normal temperature. The built-in voltage
stabil izer means that the functioning of the recorder
does not depend on the unstabilized supply voltage,
except during fast wind which is at a speed in
direct proportion to the supply voltage.

2. Danger of Polarity Inversion

A diode connected in parallel on the power supply
will short circuit it if polarity inversion occurs.
The discharge current may overheat the wiring

insulation, which disintegrates and produces cor-

rosive agents. 2,5A fuses inserted in the battery box

5

/

" (33.5 mm) and they should be bet-

16

\132"

(59.5 mm) and 2

breaks the circuit; this fuse should be replaced

j

5/

" (62.5 mm) long.

32

if the recorder still does not work after the cells
have been replaced in the correct order.

3. Check on Supply Voltage and Condition of
the Batteries or Accumulators

Set meter function switch 12 on BATT. and main
switch 4 on RECORD. The red needle of meter 14
shows the unstabilized voltage expressed for one
cell (VOLTS/CELL); the total voltage is obtained
by multiplying this reading by 12. Simultaneously
the green needle indicates the voltage required by

the motor, with the same reduction factor; the
wider the angle between the two needles, the greater
the voltage reserve.

The index at 1.25 V on the scale marks the mini-

mum voltage at which manganese dioxide batteries
should be recharged so that the discharge/recharge

cycle can be repeated several dozen times.

SPEED

signal when the recorder is in operation: it shows a
white segment when voltage and speed are correct,
but turns black as soon as the supply voltage falls

below the minimum admissible value.

4. Operating Conditions

The following data have been extracted from docu-

mentation obtained from various suppliers. The list

of makes quoted here is not exclusive; the manu-

facturers mentioned are those which provide the

most accurate and readily-available information.

KUDELSKI S.A. does not accept any responsibility

for the degree of accuracy of the values indicated.

In general, thr, performance of a battery cell or

accumulator depends largely on the conditions and

length of storage before use. Care should therefore

be taken when suppliers are selected

&

POWER indicator 16 gives a warning

•

L

5. Leclanche Standard Batteries (carbon-zinc)
These batteries are light, inexpensive and sold every-

where. Their capacity varies considerably, depend-

ing on how they are used: it is high with low current,
but low with high current and acceptable with an
average current of about 350 mA, if periods of use
are interspersed with rest periods during which the

cells can depolarize (e.g. 4 hours use every 24 hours).

Normally the batteries can be used at temperatures

from 32° F (0° C) to 122

special types can be used at a lower temperature.

If batteries are stored at or below 68
their shelf life should be more than 12 months,
with remaining energy content 75 to 90%. This is
reduced to three months when the storage tem­perature is "04° F (+40° C). Above 122
batteries deteriorate rapidly. Cold storage produces
excellent results and certain cells retain their full
capacity if deep-frozen.

A carbon-zinc battery is considered to be com­pletely discharged when the voltage at its terminals
falls to 0.9 V with normal current flow.

6. Manganese Dioxide Alkaline Batteries

Of more recent design, these batteries have a higher

capacity, with the same current, than carbon-zinc

batteries. They can be used between 4

and 158

24 months at 68° F (+20° C) and even for more

than 12 months at 113° F (+45° C) according to

MALLORY. The discharge current is constant and
does not require rest periods as there is no need to
depolarize. However, these batteries are about 50%

heavier and cost more than the standard type. They

are suitable for use when:

0

F (+710C) and stored for more than

- the temperature is unfavourable for carbon­zinc batteries

- a long storage period is required

- the ratio of weight or volume to recording
hour must be as low as possible (ease of trans-

port and forwarding)

- the recorder is used for long uninterrupted

periods
there is high power consumption using
measurement microphones and preamplifiers
with a heating circuit.

0

F (+50°

CI,

and certain

0

F (+20° C)

0

F (+50° C)

0

f

(_20° C)

charging the cells beyond this limit, thus shortening
their life. A completely discharged cell can also be
recharged, but only once or twice.

Warning
WONDE R recommend recharging their battery
cells: MALLORY forbid it and warn the user of the
danger of explosion. EVEREADY produce a
special cell which can be recharged.

Before recharging manganese batteries it is absolu­tely essential to consult the manufacturer or supplier
to make sure that the type used lends itself to this
procedure.

7. Mercury Cells

The capacity and shelf life of these cells are greater
than for manganese batteries. However, they are
heavier and more expensive and they do not per­form so well at low temperatures, their lower limit
being 50
types.

In the majority of cases polarity is inverted - the
can is the positive pole - and a mechanical adapter
is required for using the batteries with a NAGRA
recorder; the only known exception is WONDE R
Pilat which has conventional polarity. As there is a
high risk of inversion, the polarity of mercury
batteries should be determined very carefully.

The voltage at the terminals of mercury cells
remains almost constant at 1.2 V during discharge;

it istherefore impossible to estimate their remaining

capacity by measuring their voltage.

8. Danger of Leakage

Electrical energy is liberated through a chemical re­action which fundamentally alters the constituants
of the battery cell and, in particular, attacks the
can. When the cell is completely discharged, it may

leak a corrosive liquid which can cause serious
damage to the inside of the recorder. The batteries
should therefore be checked frequently; if the

recorder is not going to be used for several weeks,

the batteries should be removed.

Leak-proof batteries are available which almost

completely eliminate the risk of leakage.

0

F (+100C]. except for certain special

[

r

[

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Some manufacturers indicate that it is possible to
recharge their manganese batteries under certain
conditions; WONDE R sanctions recharging their
manganese batteries when their charge falls to 80%
of their total capacity. Voltage per cell is then

1.25 V and this value is indicated by an arrow on

the VOL TS/CELL scale of meter 14.

Recharging can be done with a maximum current
equivalent to one fifteenth of the nominal capacity,
i.e. 0.5 A fora 7.5 A cell; charging should be stopped
when the voltage at the cell terminals reaches

1 fiR to 1.7 V. It is important not to continue

9. Nickel-cadmium Accumulators
The information below is again based on docurnen-

tation obtained from manufacturers and is an

indication only, as the evaluation criteria used are

different in each case.

Length of Life
The essential advantage of accumulators is that they
have a long life. Even if only 100 charge/discharge
cycles can be obtained, the cost per hour of opera­tion is approximately one-tenth that of battery

12. Conclusion

Generally, since battery or accumulator cells are
chosen according to the power consumption of a
given recorder, the following uses are possible:

- NAG RA IV S-J plus accessories, with .accumu­lators or with mercury or dioxyde manganese batteries

- NAGRA IV S-J without accessories or
NAGRA IV S-JS, possibility of using carbon­zinc battery cells.

Leak-proof battery cells are preferable. A PAR
charger is recommended for recharging accumula­tors as they do not have to be removed from the

if

recorder

this accessory is used.

m

Average
Current

240mA

310mA

400mA

460mA 100% RECORD

620mA 100% RECORD

765mA

Recorder

Setting in

Relation to

Length of

Use

50% TEST; Line input (without microphone)
50% RECORD

100% RECORD line input

lor Fast Wind

or 50% TEST! Microphone inputs with 1 OSJA-B K amplifier
50% RECORD 2 QJPA preamplifiers with heating

100% RECORD

or Fast Wind

or Fast Wind

or Fast Wind

100% RECORD

or Fast Wind

TOTAL LENGTH OF

OPERATING CONDITIONS

Inputs and Accessories

4 Hours

every

24 Hours

Eveready 1150IEveready E95 Accumulators

Carbon· zinc : Manganese·

Batteries dioxide Capacity

10 h 25 h

6h 22 h

-

Microphone inputs with 1 QSJA-BK amplifier
2 QJPA preamplifiers with heating

Microphone input with 1 B & K 2619 or 2618
preamplifier with heating, QSJP adapter and 3h 11 h
QSJA·BK microphone amplifier

Microphone inputs with 2 B & K 26 19 or 261 B
preamplifiers with heatinq, QSJP adapters and
QSJA·BK amplifier

Microphone inputs with 2 B&K 2615 pre­amplifiers, QSJP adapters and OSJA·BK
amplifier

4.5h 5h

-

-

use

Continuous Use

Nickel·cadmium

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Batteries 2-2.5 Ah

9h

6.5 h

14,5h

4.5 h

5.5 h

3h

3h

2h

Capacity

4Ah

17 h

13 h

10h

9h

6.5 h

5h

NAGRAIY.SJ

configurator

L
[

[
[

[

[

[

Synchronization

SlO 13400

SlO-3

GClS 16300

OSV-2

OSlS 16350

Automatic speed synchronizer

Synchroniseur automatique de vitesse

13419

Crystal pilot generator for SlO
Generateur piloteaquartz pour SlO

Adapter for connecting SlO to NAGRA IV-SJ

Adaotateur

14600

Manual speedvariator

Variateur manuel de vitesse

Synchronizer for NAG RA IV-SJ
Synchroniseur pour NAGRA IV-SJ

pour

la connection SlO NAGRA IV-SJ

f

Internal electro accessories

OFMS 06780 Frequency meter for 50 Hz pilot signal

QSGX

QSJC 01128 Universal power supply for measuring microphones

QSJA­SK Amplificateura2 canaux pour prearnpliticateur QSPB

OSJA
BK Amplificateura2 canaux pour preamplificateur BK

OSJA­MKH

Frequence-rnetre pour signal pilote 50 Hz
Frequency meter for 60 Hz pilot signal

06781

Frequence-rnetre pour signal pitote 60 Hz

06698 Crystal pilot generator for 50 Hz

Generateur piloteaquartz 50 Hz

Crystal pilot generator for 60 Hz

06699

Generateur oitoteaquartz 60 Hz

Alimentation universelle pour microphones de mesure
2-channel amplifier for QSPB preamplifier

01165

2-channel amplifier for BK preamplifier

01170

01175 2-channel amplifier for MKH 110 microphones

Amplificateurs il2 canaux pour microphone MKH 110

Modulation

OSPB 11001

QSJP 11025

QSJP- 11050
GR

QJPA

11075

QCJ-

11902

MKH

16450

QSSF

OCJE 11900

QCJC

11901

16001

QSCM

16475

OSSC

Preamplifier for BK microphone cartridges
Preamplificateur pour microphoneacapsule BK

Adapter for connecting BK preamplifiers to NAGRA IV-SJ
Adaptateur pour connecter les preamptlficateurs Bk

Adapter for connecting GR preamplifiers to NAGRA IV-SJ
Adaotateur pour connecter les prearnplificateurs GR au NAGRA IV-SJ

Preamplifier for BK measuring cartridges
Preamplificateur pour capsulesde mesure BK

Cable for connecting MKH 110 microphone to NAGRA IV-SJ

Cable pour connecter les microphones MKH 110 au NAGRA IV-SJ
Amplifier with balanced outputs

Amplificateur avec sorties tlottantes
Line input cable with banana plugs

Cable d'entres ligne avec fiches banane
CUE input/output cable

Cable d'entree/sortie CUE
Commentary microphone with AlC

Microphone de commentaire avec RAS
Synchronizer for slide projector

Synchroniseur pour projecteur de diapositives

iau

NAGRA IV-SJ

[

[

[

[
[
(

I

NAGRAI\l..SJ

configurator

[
[

Power supply

ATN-2

OCAS 98001

OCAW

PAR

PPO

PO

PA-R 98251

PA-4 98254

AST

Carrying eases

OHP 14120

OHC 14125

OHTP 99009 Standard carrying casewith pocket

OHTRC 99220 Leather cover for OSET

Mains power supply 110-250 V with pilot signal output

14350

Alimentation secteur 110-250 V avecsortie signal pilote
Mains cable with Swissplug

Cable d'alimentation secteur avec fiche suisse

98003 Mains cable without mains plug

Cable d'alimentation secteur sansfiche secteur

13200

Charger for PA type rechargeable cells
Chargeur pour accumulateurs du type PA

14150 Multiple connection box

Bolte de derivation

98202 Set of 12 standard cells

Jeu de 12 piles standard
Set of 15 rechargeablecells withextension 2,5 Ah

Jeu de 15 accumulateurs avec rallonge 2,5 Ah

Set of 12
Jeu de 12 accumulateurs 4 Ah

Stabilized power supply for measurements

90400

Alimentation stabilisee de laborataire

Carrying handle
Poignee

Spare carrying strap for NAGRA IV-SJ
Courraie de rechange pour porter Ie NAGRA IV-SJ

Saooche standard avec poche

Cauvercle de sacachepour OSET

4 Ah rechargeable cells

E)(ternal electro accessories

OGB 14001 10 1/2" reel adapter

OCA

OGBC 14005

OGBN 14006

OGBA 14007 AEG-type hub holder

OSM 14700

IACC 17910

OCAS 98001 Mains cable with Swiss-type plug

OCAW 98003 Mains cable without mains plug

Mechanical accessories

OTIM 14650 Tape driven timer

OLEN

OAAC 06260 Tape cleaning blade

MAG

OSH

Adaotateur grande bobine 267 mm

Start-stop cable for remote controt

14102

Cable start-stop pour commandeadistance

Normal 8 mm cinespool holder
Parte-bobine cinema (standard I

NAB-type hub holder
Porte noyau type NAB

Porte noyau type AEG

Field monitor and amplifier

Maniteur-amplificateur de reportage

Removable cell compartment for OSM and IS
Magasin arnovible d'accumulateurs pour OSM et IS

Cable d'alimentatian secteur avec fiche suisse

Cable d'alimentatian secteur sansfiche secteur

Compteur temps eruralne par la bande

14655 Tape driven metrical counter

Compteur rnetrique entralne par la bande

A.deur de bande

9OBOI

90802 Electronically-controlled degausser 110 - 117 V

14130 Lid when using 7" reels

,

Electranically-contralled degausser220 - 240 V
Demagnetiseur Acommande electronique 220 - 240 V

Demagnetiseuracommande electronique 110 - 117 V

Couvercle pour I'emploi de babines 178 mm

[
[
[

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BACKGROUND NOISE

Corresponding level with

Bruel&Kjaer cartridge

,

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Potentiometer position "K"-------------

Linear measurement
20 Hz - 200 kHz

Measurement weighted
according to ASA A

BRUIT DE FOND

Position du potentiornetre "K"

Mesure lineaire
20 Hz - 200 kHz 38~ V

Mesure ponderee
selon ASA A

10J..!V

1/2" 1"

+4 dB +4dB

44 dB 20 dB

32 dB 10 dB

Niveau correspondant avec

capsules Brliel&Kjaer

1/2"

+4 dB

44 dB

32 dB

+4 dB

20 dB 22 dB

10 dB

1"

OdB

22 dB

14 dB

o

dB

14 dB

STOE RSPAN NUNG

"K" Potentiometer position -------------

Linearmessung

20 Hz - 200 kHz
Gediimpfte Messung

nach ASA A

11.

I

The QJPA preamplifier is calibrated
in order to obtain an average fre­quency response for 1/2" and 1"
cartridges (R10LF
possible, for a given measuring car­tridge to better the very low fre-

quency range by adjusting an internal
element of the QJPA. In this case,

the frequency response will not be
as good with other cartridges.

=

2,7kU). It is

1/2"

+4 dB +4 dB

44 dB 20dB

32 dB

Le QJPA est regie de sorteaobtenir
une courbe de reponse moyenne pour
les capsu les 1/2" et 1" (R lOlF
2,7kn). II est possible, pour une
capsule de mesure donnee, d'arnelio­rer la partie TBF du spectre en ajus­tant un et.~ment interne du QJPA.
Dans ce cas, la courbe de reponse
sera evidemment moins bonne pour
une capsule differente.

Entsprechender Pegel mit
Kapseln Brliel&Kjaer

10 dB

Der QJPA ist zur Verwendung von

112"

und l"-Kapseln fur einen mittle-

=

ren Frequenzgang eingestellt. (R10lF

=

2,7kn). Fur Kapseln mit gegebe­nen Messwerten ist es moglich. den
sehr tiefen Frequenzbereich durch
Anpassung eines internen Elementes
des QJPA zu verbessern. In diesem

Fall wird [edoch bei Verwendung

einer andern als der gemessenen Kap-

1"

OdB

22 dB

14 dB

L
I
I

QSJP

Adapter for Bru

et

& Kjeer Preamplifiers

I

ENGLISH

The OSJP is an external acces­sory for the NAGRA IV-SJ which
connects the Bruel

type preamplifier, as well as the

2615 and, if desired, the 2618 and
2627, to the recorder; the latter

should be equipped with the

OSJA-BK microphone amplifier and

the OSJC power supply.
The adapter is fitted with a plug

which can be connected to a micro­phone input of the NAG RA and a
Connector corresponding to the plug
of the Bruel

The K factor of the Bruel & Kjaer
cartridge used can be directly com-

pensated using the potentiometer

with a

&

-2 dB to +4 dB scale.

&

Kjaer 2619

Kjaer preamplifiers.

FRAN~AfS

Le QSJP est un accessoire ex­terne du NAGRA IV-SJ qui permet
d'utiliser Ie prearnplificateur type
2619, ainsi que Ie type 2615 et, Ie
cas echeant, les types 2618 et 2627
avec I'enregistreur. Celui-ci doit
etre equipe de I'amplificateur de
microphone OSJA-BK et de l'ali­mentation QSJC.

Cet adaptateur est muni d'une fiche
qui se branche
phone du NAGRA et d'une prise
correspondant
amplificateurs

Un potentia metre gradue de

+4 dB permet de campenser directe-

ment Ie facteur K de la capsule

Bruel&Kjaer utilisee.

a

une entree micro-

Ii

la fiche des pre-

Bruet

&

Kjaer.

-2

DEUTSCH

Oer QSJP ist ein externes Zube­her zum NAGRA IV-SJ, mit wel­chem der Bruel&Kjaer Vorverstar­ker Typ 2619, sowie der Typ 2615
und gegebenenfalls die Typen 2618
und 2627 an das Bandgedit anzu­schliessen sind. Dieses muss mit dem
Mikrophon-Verstarker OSJA-BK und
der Speisung QSJC ausqerustet sein.

Der Adapter ist versehen mit einem
Stecker, passend zur Mikrophon­eingangsbuchse des Bandqerates und
mit einer Buchse passend zum
Stecker des Bruel

starker.

a

Ein van
tentiometer errnoqlicht die direkte
Anpassung an den K-Faktor der ver­wendeten Briiel & Kjaer Kapsel.

-2

&

bis +4 dB geeichtes Po-

Kjaer Vorver-

I

I

Plug-in Module for

Microphone Amplifier

QSJA-BI<

NAG RA

IV-SJ

I
I

I

I

I
I

I

n

I

I

,

I

,

ENGLISH

The QSJA-BK is a switchable gain
amplifier, for capacitor measuring
microphones, which can be plugged
in inside the NAG RA. This acces-

sory makes it possible to use

&

Kjaer 2619, as well as 2615 and,

if desired, 2618 and 2627 type pre-

amplifiers with the QSJP adapter, or

the General Radio 1560
amplifier with the QSJP·GR adap­ter.

The amplifier, preamplifiers, adap-

ters and cartridges can function only
when the QSJG microphone power
supply is installed in the recorder.

P42

Bruel

pre-

FRANCAIS

Le QSJA-BK est un amplificateur
gain commutable pour microphone
de mesure
chableal'interieur
accessoire permet
amplificateur
2619, ainsi que Ie type 2615
cas echeant, les types 2618 et 2627
avec l'adaptateur QSJP, ou Ie

prearnplificateur General Radio

1560 P42 avec I'adaptateur

QSJP·GR.

L'amplificateur, les prearnplifi­cateurs, adaptateurs et capsules ne
peuvent fonctionner que si I'alimen­tation de microphone QSJG est

mantee
streur.

a

condensateur, enfi-

du NAGRA. Get

d'utiliser

Bruel

&

Kjaer type

a

l'interieur de l'enregi-

Ie

pre-

et,

DEUTSCH

a

Der QSJA·BK ist ein Verstarker mit
schaltbarer Verstarkunq fUr Konden-
sator-Messrnlkrophone und ist im

Inneren des NAG RA eingesteckt.
Mit diesem
gende Einheiten verwendet werden:
BrLiel & Kjaer Vorverstiirker Typ

Ie

2619. sowie auch 2615 und gegeben­enfalls 2618 und 2627 mit dem
Adapter QSJP. oder General Radio

Vorverstarker Typ 1560 P42 mit

dem Adapter QSJp·G R.
Der Verstarker, die Vorverstiirker,

Adapter und Mikrophonkapseln
werden durch die Mikrophonspeise-

Einheit QSJC gespeist, die in das

Innere des Tonbandgeriites einge-

steckt wird.

Zubehor konnen fol-

Equivalent input noise
A. Linear 20 Hz to 20 kHz
B. ASA A weighted

A

Noise level on
+40 dB and 1/

Corresponding
sound level with

a

12.5mV/N/m

cartridge 24dB 17 dB
Saturation level on

C. Maximum input voltage

D. Corresponding sound level

+80 dB position
+60 dB position
+40 dB position

" 2.5/lV 1.1 /lV

2

2

1f2"

C

28

0.4
40mV

POSition

V

V

B

D
165dB
128dB
108dB

Bruit de fond
A. mesure lineaire de 20 Hza20 kHz
B. mesure ponderee ASA A

A

Tension de bruit
rarnenee
en position +40 dB
et

Niveau sonore
correspondant
avec une capsule
de 12,5 mV/N/m

de sensibitite 24dB 17dB

Niveau de saturation en position

\11"

C. tension d'entree maximale

D. niveau sonore correspondant

a

l'entree,

1f2"

pos. +80 dB
pas. +60dB
pos. +40dB

2,5/lV 1,1 JlV

2

C

28

V

0,4 V

40mV

B

D

165dB
128dB
108dB

Rauschen

A.

linear von 20 Hz bis 20 kHz

B. ASA A bewertet

A

Rauschspannung

auf den Eingang
bezogen, in Stetlunq
+40dB und Ih" der

Schalter 2,5/lV 1,1 JlV
Entsprechender

akustischer Pegel
mit einer Kapsel­empfindlichkeit von

12,5mV/N/m2 24dB

Ubersteuerungspegel in

!f2"

C. maximale Spannung

D. Entsprechender akustischer Pegel

C

St. +80 dB
St. +60dB
St. +40 dB

28

0,4

40mV

V

V

B

17 dB

Stellung

D
165dB
128dB
108dB

I

I

n

1

(

Dimensions: 2%" x 1%"x1"

67x58x28 mm

Weight: 3 oz - 80 9

CARTRIDGE
CAPSULE
KAPSELN

BK 1/8"

MECHANICAL ADAPTER
ADAPTATEUR MECANIOUE

MECHANISCHE ADAPTER

[IDlI]

BK

1/4"

4136

BK

1/4"

!IDID

BK 1/2"

~ 4134

4149 4163

Dimensions: 67 x 58x28 mm
Poids: 80g

PREAMPLIFIER
PREAMPLIFICATEUR
VORVERSTARKER

BK 2618

BK 2615

BK 2619

Abmessungen: 67x58 x 28 mm
Gewicht: 80 9

ELECTRICAL ADAPTER
AOAPTATEUR ELECTRIOUE
ELEKTR ISCHER ADAPTER

t-+-t--I

QSJP-BK

II

1/

II

t--:I'-I....-t

II

II

NAGRA IV-SJ

QSJA-B K

f

(

II

II

l

f

f

r

J

I
I

Amplifier for Sennheiser

M KH

QSJA-MI<H

110

Microphone

I

J

I

n

I
I

I

,

1

ENGLISH

The OSJA-MKH is an amplifier
which can be plugged in inside
the NAGRA IV-SJ so that
Sennheiser MKH 110 and 110-1

measuring microphones can be used.

This accessory has two fixed gain
amplifier channels. The sound level
is obtained by adding 60 dB for the

MKH 110 and 80 dB for the
MKH 110-1 to the readings given by

the NAGRA. The amplifier also

makes it possible to supply power

direct to the microphone from the

NAG RA without using the OSJC

power supply. The dynamic of the

microphone is not affected by the
use of the amplifier.

FRAN9AIS

Le OSJA-MKH est un amplifica­teur enfichable
NAGRA IV-SJ qui permet d'utiliser
les microphones de mesure
Sennheiser MKH 110 et 110·1.

Cet accessoire comporte deux
canaux d'amplification

Le niveau sonore s'obtient en ajou­tant 60 dB aux indications du
NAGRA pour Ie MKH 110 et 80dB
pour Ie MKH 110-1. II permet
d'autre part d'alirnenter directement

Ie microphoneapartir du NAGRA
sans utiliser I'alimentation OSJC.

La dynamique du microphone

pas alteree par les performances de

I'amplificateur.

a

l'interieur du

a

gain fixe.

ri'est

DEUTSCH

Der

OSJA-MKH ist ein Verstarker,
im Innern des NAG RA IV-SJ ein­steckbar, der fur die Verwendung
der Messmikrophone MKH 110 und

MKH 110·1 von Sennheiser vorge-

sehen ist.

Dieses Zubehor enthalt zwei Kanale

mit einer festen Verstarkunq.
akustischen Pegel erhalt man durch
Addition von 60 dB fur MKH 110
und 80 dB fur MKH 110·1 zur An-

zeige des NAGRA Gerates. Die

Mikrophone werden mit diesem Ver-

starker vom NAGRA IV-SJ ohne

Verwendung der Speiseeinheit QSJC

gespiesen. Die Dynamik des Mikro-

phons wird in keiner Weise vom

Verstarker beeintrachtiqt.

Den

,

The MKH 110 preamplifier can be

connected to the microphone inputs
by means of the QCJ·M KH input
cable.

Le microphone MKH 110sebranche

a

une entree microphoneaI'aide du

cable QCJ-MKH.

Das Mikrophon MKH 110 wird an
eine Mikrophoneingangsbuchse mit· .
tels des Kabels QCJ-MKH anqe­schlossen.

SPECIFICATIONS

Current consumption unloaded

11 mA

Current consumption with 1 micro­phone 19mA

Frequency response

2.5 Hz-35 kHz ±0.2 dB

Equivalent input noise
A. linear from 20 Hz to 20 kHz

B. ASA A weighted

A

Noise level
Corresponding sound

level with M KH 110
microphone, referred

to 2.1O-sN/m
Saturation sound level

with MKH 110
with MKH 110-

QCJ·MKH connecting cable

Dimensions:

Weight: 1oz - 22 9

2

length

2

Y4"x21h"

60x67mm

12.uV

30dB 25dB

i

41h

ft -

7pV

130dB
150dB

1.50 m

SPECIFICATIONS

Consommationitvide 11 mA
Consommation en charge

avec 1 miero phone 19 mA
Bande passante

2,5 Hz-35 kHz ±O,2 dB

Bruit de fond
A. mesure lineaire de 20 Hzit20 kHz

B.

rnesureponderee ASA

B

Tension de bruit
rarnenee
de

Niveau sonore cor-
respondant avec

microphone MKH
110,

2.1O-sN/m2 30dB 25dB
Niveau sonore de saturation

avec MKH 110 130dB
avec MK H 110-1 150 dB

Cable de raccordement QCJ-MKH

Dimensions: 60x67 mm
Poids: 22g

it

l'entree

l'amplificateur

rapporte

a

A

A B

12/N

longueur 1,50 m

7

pV

TECHNISCHE DATEN

Stromverbrauch ohne Mikrophon

11 mA

Stromverbrauch mit einem Mikro­phon 19mA

Frequenzgang

2.5 Hz bis 35 kHz bei ±O,2 dB

Rauschen

A. linear von 20 Hz bis 20 kHz

B . bewertet ASA A

A

Rauschspannung

auf den Verstarker-
eingang bezogen 12J.1V

Entsprechender

akustischer Pegel

mit dem Mikrophon
MKH-l10, auf

2.10-5N/m

bezogen 30 dB

Obersteueru ngspege
mit MKH 110
mitMKH 110-1

Anschlusskabel QCJ·MKH

Abmessungen: 60 x 67 mm
Gewicht: 22 9

2

I

Lange 1,50 m

7pV

25dB

130dB
150dB

B

••

The NAGRA IV-S and IV-SJ tape re­corders may be fitted with a third
track for the recording and playback of
a pilot signal which will permit subse­quent synchronization. In addition to
the pilot signal, or in its place, the
third track can receive a commentary
for identifying the sequences recorded
on the two modulation tracks, or gi·
ving directives for the setting up of
these sequences; for instrumentation
application, the commentary could in­clude instructions in order to analyze
the recordings.

The QSCM microphone is connected
to the CUE socket of the tape recorder.
A commentary can be recorded at two
different stages:

- during the recording of the modula­tion tracks, with or without simulta-

neous pilot signal, all previous infor­mation being erased on the three
tracks,

- during the playback of the modula­tion tracks, with partial erasing of the
signals previously recorded on the pi-

lot track.

The microphone system is mounted on
the housing which contains the pream­plifier and the automatic level control;

the latter ensuresapractica lIy constant

output voltage when the input level va­ries from -20 to +10 dB in relation to
the nominal sensitivity. A high-pass fil­ter cuts the frequencies below 250 Hz

to avoid any influence on the pilot si-

gnal in case of simultaneous recording.
In spite of the relatively low carrier
used for the FM recording, the upper
limit of the bandwidth enables excel­lent speech reproduction. The push­button connects the output of the pre­amplifier to the corresponding termi­nal of the Tuchel plug and turns on
the FM modulator of the third track
by connecting it to the tape recorder
supply.

Les rnaqnetophones NAGRA IV-S et
IV-SJ disposent d'une trolsisrne piste

pour I'enregistrement et la lecture d'un
signal pilote, qui permettra une syn­chronisation
gnal pilote, ou a sa place, la troisierne

piste peut recevoir un commentaire

destineaidentifier les sequences enre-

qistrees sur les deux pistes de modula-

tion, ouadonner des directives pour

Ie montage de ces sequences; en metro­logie, Ie commentaire pourra cornpor­ter des instructions pour Ie depouille-
ment des enregistrements.

Le micro QSCM se branche ala prise
CUE du rnaqnetophone. L'enregistre­ment du commentaire peut se faire a
deux stades differents :

- pendant I'enregistrement des pistes
de modulation, avec ou sans signal
pilote sirnultane, toute information
anterieu re etant effacee su r les trois
pistes.

- pendant la lecture des pistes de mo­dulation, avec effacement partiel des
signaux enreqistres anterieurernent

sur la piste pilote.

La capsule microphonique est montee

sur Ie boitier qui contient Ie preamp
ficateur et Ie regulateur automatique
de sensibilite: ce dernier assure une ten-

sion de sortie pratiquement constante

lorsque Ie niveau d'errtree varie de

ulterieure.

En plus du si-

ll-

-20 a +10 dB par rapport ala sensibili-

te nomina Ie. Un filtre passe-haut coupe

les frequencss inferieures a 250 Hz,

pour

eviter

toute influence sur Ie si-

gnal pilote en cas d'enregistrement si-

rnultane, Malgre la porteuse relative­ment basse utilisee pour I'enregistre­ment en modulation de frequence, la
limite superieure de la bande passante
permet une excellente reproduction
de la parole. Le bouton-poussoir con­necte la sortie du prearnplificateurala
broche correspondante de la fiche
Tuchel, et met en service Ie modula­teur FM de la troisierne piste en Ie
cordant a I'alimentation du magneto­phone.

rac-

Fur die Aufzeichnung und Wiedergabe
eines zur spateren Synchronisation be­stimmten Pilotsignales, steht bei den
Tonbandqeraten IV-S und IV-SJ eine
dritte Spur zur Verfuqunq. Auf dieser
Spur kann, zusatzlich zum Pilotsignal
oder an dessen Stelle, ein Kommentar
aufgenommen werden, welcher die auf­gezeichneten Sequenzen identifiziert
oder fur die spatere Montage bezeich-

net; bei Messdaten-Aufnahmen kon-
nen Anweisungen fUr die Auswertung
aufgenommen werden.

Das QSCM-Mikrophon wird an der
CUE-Buchse des Tonbandqerates ange­schlossen. Die Aufzeichnung eines

Kommentares kann zu den zwei fol­genden Zeitpunkten stattfinden :

- bei der Aufnahme der Tonspuren,

mit oder ohne Pilotsignal; dabei wer­den aile fruher aufgenommenen Si-
gnale auf den drei Spuren geloscht;

- bei der Wiedergabe der Tonspuren,
wobei die auf der Pilotspur vorhande-

nen Signale teilweise geloscht werden.

Die Mikrophonkapsel ist auf dem

hause

montiert, das den Vorverstiirker
und den automatischen Empfindlich­keitsregler enthalt. Dieser Ernpfind­lichkeitsregler ergibt eine praktisch
konstante Ausgangsspannung, wenn

der Eingangspegel in Bezug auf die

nominale Empfindlichkeit von - 20 dB

bis +10 dB variiert. Ein Hochpassfilter
sperrt die tiefen Frequenzen unterhalb
von

250

Hz, damit bei gleichzeitiger
Aufzeichnung das Pilotsignal nicht be­einflusst wird. Trotz des relativ niedri­gen Traqers bei der FM-Aufzeichnung,

ist die obere Grenzfrequenz

ausgezeichnete Sprachwiedergabe

reichend. Durch die Drucktaste wird der

Ausgang des Vorverstarkers an den ent-

sprechenden Anschluss der Tuchel-
Buchse gelegt, und dem FM-Modulator
der dritten Spur wird die Speisespan­nung des Tonbandqerates zuqefuhrt.

fur

Ge-

eine

aus-

SPECI FICA TlONS

Normal output voltage with automa­tic level control 700 mV, determi­ning a frequency deviation of ±20
Operating range of the automatic level
control from 3 to 100 ,ubar
Stabilized supply voltage -10 V,

sumption 2.5 mA

Dimensions
cable length 4' 8"
Weight with cable and plug 7 oz

4 3/4x1 5/8x1 1/8 ",

%

con-

SPECIFICATIONS
Tension nominale de sortie avec

glage automatique de sensibilite

700 mV, determinant une excursion

de

frequence

Plage de regulation automatique de la

sensibi lite de3a 100 IJbar
Tension d'alimentation stabilisee -10V,
consommation 2,5 mA

Dimensions 120x40x28 mm, cable
de 140 cm

de ±20

%

re-

TECHNISCHE DATEN

Nominale Ausgangsspannung mit

automatischem Empfindlichkeitsregler

700 mV; diese Spannung ergibt einen
Frequenzhub von ±20%.Regelbereich
des automatischen Empfindlichkeitsre·
gler: 3 bis 100 pbar. Stabilisierte
Speisespannung

2,5mA
Aomessungen 120 x 40 x 28 mm,

Kabel 140 cm

-10

V, Stromverbrauch

recorded, with about 0.001 % accu­racy.

The QSV2 speed varier can be con­nected to the SPEED VARIER
INPUT when it is necessary to
extend the synchronization range

(±12%).
The meter gives two readings:

- if the NAGRA SPEED switch is

on FREE, i.e. without speed slaving,

it indicates the frequency error bet­ween the playback pilot signal fre­quency and that of the svnchroniza­tion signal. One complete oscilla-
tion of the needle left/right/left, in
two seconds, indicates a speed
ference of 1%.

- if the same switch is set on
SLAVE, the synchronizer adjusts
the tape speed, slaving the playback
pi lot signal to the reference signal.
The meter needle then shows the
phase difference between the two
signals and should not oscillate.

If the desired speed correction is
beyond the slaving capability of the
device (±3%), the meter needle
begins to oscillate; use of the QSV2
speed varier will extend the slaving
range by ±12%.

The PILOT LEVEL indicator
becomes black if there is no pilot
signal or it is not sufficient for good
synchronization.

dif-

egale la
precision de I'ordre de 0,001%.

La deuxierne prise d'entree SPEED

VARIER INPUT est destinee

voir

lorsqu'il est necessaire d'elarqir la
plage de synchronisation (± 12%).

Le qalvanornetre donne deux indio

cations:

- en position FREE du commute­teur NAGRA SPEED, c'est-a-dire
sans asservissement de vitesse, il
affiche t'ecart entre la frequence du
signal pilote lu et celie du signal de
synchronisation. Une oscillation
complete de I'aiguille gauche/droite/
gauche en deux secondes correspond

a

une ecart de vitesse de 1%.

- en position SLAVE du rnerne
commutateur, Ie synchronisateur

regie la vitesse de defilement de la

bande, en asservissant Ie signal pi-

lote lu au signal de reference.

L'aiguille du qalvanometre indique
alors I'ecart de phase entre les deux
signaux; elle ne

Au cas
corriger excede les possibilites
d'asservissement du dispositif (±3%),

I'aiguille du galvanometre se met
osciller; le variateur de vitesse QSV2
permit d'elarqir cette plage d'asser-
vissement de ± 12%.

Le voyant PILOT LEVEL devient
noir si le signal pilote est absent ou
insuffisant pour une bonne svnchro-
nisation.

vitesse

Ie variateur de vitesse QSV2,

originale avec une

doit

au

I'

ecart de vitesse

a

rece-

plus osciller.

einer Genauigkeit van etwa 0,001%
abzuspielen.

Die zweite Eingangsbuchse SPEED
VARIER INPUT dient zum An­schluss des Geschwindigkeitsreglers
QSV2, falls der Regelbereich auf
±12% erweitert werden muss.

Das Instrument gibt zwei verschie-
dene Anzeigen:

- in

Stellunq

NAGRA SPEED, das heisst ohne
Geschwi ndig kei tsnach rege lung, ze igt
es den Unterschied zwischen dem
abgetasteten Pi lotsignal und dem

Bezugssignal an. Eine volle Schwing-

ung links/rechts/links in zwei Sekun-
den entspricht einem Geschwindig-

keitsunterschied van 1%.

- in Stellung SLAVE des gleichen
Schalters regelt der Synchronisator
die Bandgeschwindigkeit, indem es
das abgetastete Pilotsignal mit dem

Bezugssignal synchronisiert. Der

strumentenzeiger gibt in diesem

Faile den Phasenunterschied der
beiden Signale an; er dart nicht
schwingen.

a

zugleichende Geschwindigkeits·

unterschied die Nachsteuerunqsrnoq-

lichkeit der Vorrichtung (±3%), so

a

beginnt der Zeiger zu schwingen; der
Geschwindigkeitsregler QSV2 erwei­tert diesen Bereich

Das Schauzeichen PILOT LEVEL
wird schwarz, wenn das Pilotsignal
nicht vorhanden oder zu schwach
fur gute Synchron isation ist.

FREE des Schalters

Uberschreitet

urn

±12%.

der

In-

aus-

Applications

- Filming on playback

- Transfer of sound recorded on a
NAG RA to a film or perforated
tape, facsimiles

- Correlation of signals recorded
on several recorders

- Synchronous measurements etc.

SPECIFICATIONS
Nominal synchronization range

±3%

Current consumption

Dimensions:

Weight: 13 oz - 360 9

5V2"

x 3

140x82x30 mm

8.8mA

1

/4"

x

1

V4"

Applications

- Tournage en playback

- Transfert du son NAG RA sur film
ou bande perforee, utilisation
pour fac-similes

- Correlation des signaux enreqi-

stres Sur plusieurs appareils

- Mesures synchrones etc.

SPEC IF ICATIONS

Plage de synchronisation propre

±3%

Consommation

Dimensions: 140 x 82 x 30 mm
Poids: 360g

8,8

mA

Anwendungsbeispiele:

- Filmen in Playbackverfahren

Uberspielen des Tons vom

NAGRA·Gerat auf Film, perfor­iertes Tonband sowie fur
simile

Korrelation yon auf mehreren

Gersten aufgezeichneten Si-
gnalen, synchrone Messungen.

TECHNISCHE DATEN

Eigener Nachsteuerungsbereich der

Synchronisation ±3 %
Stromverbrauch 8,8 mA

Abmessungen: 140 x 82 x 30 mm
Gewicht: 360g

Fak-

CHANNEL

I

LINE

!?i ~

~ I

""<.

CHANNEl

2

L".

-

--

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IOKE

--,

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81

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1I2"\III.~

96

J;1.5nF

aC4

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CHANNELl

-lOG

61

P\. •••V84CK

OUTPUT

CHANNEL 2

-lOG

"

PlAYUO<

OUTPUT

UNE

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MIKE

I

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1

WITHOUT

L - -

-PILOT VERSION

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I"

L _

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T1

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STOP"; I

hL~-

PLAYBACK;

I

loll POWER

CAlLE COLOUR

1 •
2 •

l •

4 •

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7 •

..

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At

I MICROPHg::
1: NICROPH&DUtECT AMPLlFI£R

: ATltHU' "'PUT AMPLIFIER R CHAHNEL I

AI DlRECf OUTPUT
A.

A7 PE.' LEVELvEl IHOICATOR5

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OUTPUT

tHDI~~~~~flf

TEMPORIZf: STA8t1IZER

CH4N:~ ~

CHAHHEl

R CHANNEL 1

8'

51

-nv •

r~~

TO

1.16

,&

1

BDSI~

SPEED & POWER

TACHO
HEAD~

T:\.

aS1

:

... b

- - - - __ a

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~

CRYSTAL

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Al5

FR

1

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•

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L

J

.....J

1

1

5=

6=:

ExTERNAL VIEW

OF CHASSIS

CONNECTOR OR

PLUG FROM THE

SOLDERING SIDE

MICROPHONE CHANNEL1:channell microphone input connec­tor, identical to 36

Gain selector for channel 2 microphone amplifier, 3 positions, -1-40•

+60 and +80 dB

Gain selector for channel 1 microphone amplifier, identical to 38

MICROPHONE TYPES: B

7=

8

=

&

K cartridge type selector

G

CHANNEL 2: channel 2 multiple connector

(.;\ 1=VAR. LEVEL IN: line input, input impe-

o

0

o

3

<2)

CD

1 2=

®

dance 100 kn, input voltage> 1 mV

-10G:stabilizedvoltage-l0V

4=Playback output: output voltage 10 mV at

® OdB, loed >47 kn

7=ground

EXTERNAL VIEW

Of CHASSIS

CONNECTOR OR

PLUG FROM THE

SOLDERING stOe

CD

CHANNEL1:Channell connector, identical to 41, shown with
strap plug to reintroduce the playback signal into the di rect chain

(switch 10mustbeon LINE)

e

OUTPUTS: line output connector

o

0 CD

'7'

o

\V

®

=

LINE OUT 2: line output, channel 2, out-

1

put voltage 100 mV at 0 dB in a load greater
than 10kn

2

= -lOG: stabilized output voltage -10 V

® 3 = LINE OUT 1: line output channell, out-

put voltage 100 mV at 10 dB in a load
greater than 10 kn

4 = unstabilized negative supply voltage

EXTERNAL VIEW
OF CHASSIS
CONNECTOR OR

PLUG FROM THE

SOLDERING SIDE

5 = -10 R: stabilized voltage -10 V available

only during recording

6 = STOP: motor stop control terminal (con-

nect to -10 V to stop)

=

ground

7

c

c:

PILOT: pilot signal input for the 3rd track

1 = ground

=

CLAPPER: reference oscillator or crystal

2

pilot generator control terminal

EXTERNAL VIEW

OF CHASSIS
CONNECTOR OR

PLUG FROM THE

'SOLDERING SIDE

LINE OUTPUT 2: channel 2 line output on banana jacks

LINE OUTPUT 1: channell line output on banana jacks

CUE: connector for recording and playback on the third track

EXTERNAL

VIEW

OF CHASSIS
CONNECTOR OR

PLUG FROM THE.

SOLDERING SIDE

3 = Xtal: 50 or 60 Hz internal crystal pilot

generator output

=

PILOT IN: pilot signal input

4

1=CUE IN: modulation signal input

2= -lOG: -10Vstabilizedvoltage

=

PILOT OUT: pilot signal output

3

=

-10 V: stabilized voltage available only

4

during recording

=

-10 V

FM:

5

FM modulator

= CUE OUT: signal output (direct or recorded)

6
7

=

ground

voltage terminal to activate the

G

POWER PACK: connector for external power supply

EXTERNAL VIEW
OF CHASSIS

CONNECTOR OR
PLUG FROM THE

SOLDERING

SIDE

e

Fixture for handle or strap

e

Case fixing screw

o

Plate showing recording and playback equalization

1 = -BATT.: negative pole of the battery box

=

+BATT.: positive pole of the battery box

2

and ground

3 = STOP: motor stop control terminal (con-

nect to -10 V to stop)

=

SPEED CORRECTION: tape speed correc-

4

tion signal input

5 = EXTERNAL -12 V to -30 V: 12 to 30 V

external power input, negative pole

=

-10 G: -10 V stabilized voltage

6

r-

· 1033 CHESEAUX LAUSANNE
SWITZERLAND

I

TEL.[phone]

TELEX: 24 392

I
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~,,~.(;t~

~,'·:·t.':.:~;r:~;~·;·\;:i'·~~

,<PRINTED IN SWITZERLAND BY KUDEI.SKI SA.

I
I
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••

CONTINUATION

CALffiRATION DATA SHEET

WORK ORDER/CERT. NUMBER CYCLE

A-1

MANUFACTURER

CONTROL NUMBER

NAGRA

MODEL NUMBER

IV-SJ

I

DESCRIPTION

MAG. TAPE RECORDER

I

CAL DATE

I

DUE DATE

I

ASSET NUMBER

I

REPCODE

SHIP TO ADDRESS
SIKORSKY AIRCRAFT

6900 NORTH MAIN ST.

STRATFORD, CT. 06497

I~~-'

.}. . PARAME1'ERTESTED TESTSPECIFICATIONS STANDARDIAPPLIED BEFOREADJUSTMENT AFTERA_

FREQUENCY RESPONSE 25hz-35Khz

DIRECT CH1

.,:n'.~.

DIRECTCH2

DIRECT CH1

DIRECT CH2

SIGNAL TO NOISE

+-O.3db
+-O.3db

GAIN

+-1.0db
+-1.0db

>66db 1Vrms@1Khz

@15ips

Odb1Khz @15ips

If}

~'

','

0.

lBER

;

r~.

.

'

{.,

,

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-

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TID-S-1201-01 (12/96)

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CHANNEL(j]

CIiANNELffi

FILTERS

BOX

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TAPE

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A17 A18

RECORD
HEAD

3,75" 7,S"

ERASE
HEAD

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---~~

O,-lAPE-

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...

CUE

(PHONE)

-~'----4------,

our

A21
LIGHT
TEMP,

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A 16 RECOROING PREAtr.4PLlFrER
A 17 RECORDING AMPLIFIER CHANNEL T&2

• BIAS OSCILLATOA

A 16 BIAS OSCillATOR COil

A 19 PLAVBACK AMPLIfIER CHANNEl 1&2

~S!J_- - ,

CR3B2 ~

IN4'''' • IN

REW~ONLY

....rt

e

PLAYBACK
HEAD

4II1II

e

I

.•••. PILOT

e

CHANNEL

UPPER

TRACk

CHANNEL

LOWER
TRACK

III

CHANNEL 3

HEAD

Q.AP .6'1 TO .U.V

'TF-I<r-UNCTION

PiLOT IN

.

.........

"1IAIO A9

'<0 ••••••••••

:,.,12:••••....•• '

AS A6 ,.7

BOX INTERCONNECTION

"0

ALL CONNEC10RS VIEWED FROM THE OUTSIDE

KUOElSKI SA. O""'.NAOR. ••. "''''G''''

CH· 1033 CHUE,t,UX HE'llYORt(.

TAPE DECK INTERCONNECTION

,,"GNElIC

SootiU"~nd __ ._ .....•~'~~~'. ~'_

.,.

"CWMOO'S IN(:

N't

lOCUli

QSV2

SPEED VARIER

J

QSV2

for

NAGRA 4.2, IV-S and IV-SJ

QSV2

,.-.....

.c

j'

ENGLISH

When connected to the Nagra, the
Speed Varier allows all 3 speeds
15"/s - 7.5"/s - 3.75"/s to be varied
manually up to

Sound transfer applications:

- To adjust the pilot signal
frequency to a reference.

- To compensate for a missing
pilot signal or to adjust the syn-

chronization when the pilot

signal frequency fluctuates.

Dimensions: 5 %"

Weight: 1 Ib(0.450 kg)

±12%

1

x 2

/z"

X 1 %"

(142 x 62 x 38 rnrn]

FRANCAIS

Le variateur de vitesse permet de
faire varier manuellement la vitesse
de defilement du Nagra de±12 %

II est utillsableato utes les vitesses

(38,1 cm/s; 19,05 cm/s; 9,525

Applications:

Transfert d'un ruban dont Ie
signal pilote provenait d'une ca­meraavitesse hors tolerance.

Transfert d'un ruban dont Ie
signal pilote

interruptions.

Dimensions: 142x62x38 mm

Poids :

comporte

0,450 kg

cm/s).

des

DEUTSCH

Das QSV Zubehor welches am Nagra
angeschlossen wird, erlaubt die

3 Band-Geschwindigkeiten
(38,1 cm/s; 19,05 cm/s; 9,525 cm/s)

von Hand um±12

Anwendung bei Oberspielungen :

Anpassen der Pilotton-F requenz
an die Referenz Frequenz.

- Ausgleichen schwanker.der oder
fehlender Pilotton Signale.

Abmessungen: 142x62

Gewicht:

0,450

%

x

38 mm

kg

••••••

I

I

I

QSLS

External Synchronizer for

...•

,

.

.~

NAG RA

IV-S and IV-SJ

ENGLISH

External synchronization accessory

for varying the tape speed of the

NAGRA to make the playback pilot
signal synchronous with the pilot
reference signal received by the

recorder.

I

The OSLS can be connected to the
PILOT

hand side of the NAGRA IV-S or

IV-SJ.
The synchronization signal must be

applied to the PILOT INPUT con-

nector which also carries the

reference signal from the internal

crystal pilot generator of the

NAG RA; this signal can be used tor
synchronization. This offers the
possibility of playing back the sig­nal at the speed at which it was -

&

CUE inputs on the right-

Accessoire externe de synchronisa­tion qui permet de modifier la
vitesse de defilement du NAGRA

pour rendre Ie signal pilote lu syn­chrone avec Ie signal pilate de

reference entrant dans l'appareil.

Le OSLS se raccorde aux prises

PILOT et CUE situees sur Ie cote
droit du NAGRA IV-S au IV-SJ.

Le signal de synchronisation doit
etre introduit par la prise PILOT

INPUT sur laquelJe arrive egalement

Ie signal de reference du generateur

a

quartz interne du NAGRA, qui
peut etre utilise comme signal de
synchronisation. Cette possibilite
permet d'obtenir

signal dont la vitesse de defilement

FRAN~AIS

a

la lecture un

DEUTSCH

Externer Synchron isator, welcher
erlaubt die Bandlaufgeschwindigkeit
des NAG RA-Gerates zu verandem,
urn das abgetastete Pilotsignal mit
einem externen Bezugssignal zu syn­chronisieren.

Der QSLS wird an den Buchsen
PILOT und CUE auf der rechten
Seite des NAGRA IV-S und IV-SJ
angeschlossen.

Das abgetastete Synchronisations­signal wird uber den Stecker PI LOT­INPUT eingefUhrt; am gleichen
Stecker erscheint das Bezugssignal
des im NAGRA Tonbandgeriites ein­gebauten Ouarzgenerators. Dies er-

moglicht es, das Band mit der Ori­ginalaufnahmegeschwindigkeit bei

'I

I

QSCM

Commentary Microphone

for NAGRA IV-S and IV-SJ

ENGLISH

Hand microphone for recording a com­mentary on the pilot track of the
NAGRA IV-S and IV-SJ tape recor-

ders,

FEATURES

Capacitor microphone system: intelli­gibility of the message is heiqhtened.
Sintered bronze acoustical screen ef­fectively protecting the diaphragm.

Built-in preamplifier which gives out a
strong useful signal.

Automatic level control: optimum
modulation without any manual
adjustment.

Filters determining a bandwidth adap­ted to the speech reproduction.

Operation hv

lockinq nush-hut

ton

FRAN~AIS

Microphone manuel pour I'enregistre­ment d'un commentaire sur la piste
pilote des rnaqnetophones NAGRA
IV-S et lV-SJ_

CARACTER ISTIQUES

Capsule microphoniqueacondensateur :
l'intelliqibilite du message est accrue.
Ecran acoustique en bronze tritte, pro­tegeant efficacement la membrane.
Prearnptificateur incorpore, qui delivre
un signal utile important.

Regulateur automatique de sensibilite :
modulation optimale sans aucun regia­ge manuel.

Fi Itres determinant une bande passante

adapteeala reproduction de la parole.

Mise en service par bouronpoussov

DEUTSCH

Handmikrophon fur die Aufzeichnung
eines gesprochenen Kommentares auf
der Pilot-Spur der NAGRA Tonband­qerate IV-S und IV-SJ.

MERKMALE

Kondensator-M ikrophonkapsel fur
eine bessere Sprachverstiind lichkeit.
Nahbesprechungsschutz aus Sinter­bronze.
Eingebauter Vorverstiirker mit hohem
Ausgangspegel.
Automatischer Empfindlichkeitsregler
zur optimalen Aussteuerung.
Filter zur Bestimmung eines, fur die
Sprache geeigneten, Frequenzganges.
Ein- und Ausschalten rnitte ls verriegel­barer Drucktaste .

The QSJA-BK amplifier has two

channels with switchable sensitivity,
on three positions: +40, +60 and
+80 dB.

The sound level measured using the
microphone is obtained by adding
the setting of the amplifier gain
selector to that of the attenuator
and to the reading on the measuring
instrument.

L'amplificateur QSJA-BK
deux canaux d'amplification dont
Ie gain est commutable, separernent,
sur trois positions: +40, +60 et
+SOdB.

Le niveau sonore rnesureaI'aide du
microphone s'obtient en addition­nant I'indication du selecteur de gain
de I'amplificateur de microphone
avec celles de l'attenuateur et de
I'instrument de mesure de I'enregi-

streur.

possede

Der Verstiirker QSJA-BK ist zwei­kanalig, mit
kungseinstellung durch je einen drei-

stelligen Schalter, mit den Stel-

lungen +40, +60 und +80 dB.
Den mit dem Mikrophon gemes-

senen akustischen Pegel erhiilt man
durch Addition der eingestellten
Werte an diesem dreistelligen Schal­ter und an dem
mit dem vom Messinstrument ange­zeigten Wert.

unabhanqiqer Verstar-

Heuptabschwecher

r

I

L

,..

I

[

When the QSJA-BK amplifier is used
care should be taken that the main

attenuator is not set higher than the
+40 dB position which is indicated
by a triangular index. Beyond this
position there is a risk of saturating

the input stages and the microphone

amplifier gain should be reduced
using the three-position switch. In

the +80 dB position the input level

is no longer limited, except by the
performance of the microphone car-

tridge. With.a third switch, com-

mon to both channels, the gain can
be selected according to the

meter of the cartridge used. The
exact sound level is thus obtained
direct in relation to the sensitivity

of the cartridge. This is valid for the

following

%":

1j2": 4133, 4134, 4149 and 4163
1 ": 4144, 4145, 4146 and 416.1-

With the
correction must be made to account
for its sensitivity difference.

4135

Bruel

&

Kjaer cartridges:

I/.;"

4136 type cartridge a

dia-

En utilisant cet amplificateur, il taut
veillerane pas depasser la position
+40 dB de l'attenuateur principal du

NAG RA, position reperee par un

index triangulaire. Au-dela de cette
position, il y a risque de saturation
des etaqes d'entree, et il faut alors

reduire Ie gain de I'amplificateur de

microphone
tateuratrois positions. Sur la posi­tion +SO dB, Ie niveau

plus limite, si ce

performances de la capsule micro-

phonique. Un troisieme selecteur,

commun aux deux canaux, com-

mute Ie gain suivant Ie diarnetre de

la capsule utllisee, Le niveau sonore

exact est ainsi obtenu directement,

en fonction de la sensibilite de la

capsule. Ceci est valable pour les

capsules Bruel

%":

4135

% ":

4133, 4134, 4149 et 41 63

1 ": 4144, 4145, 4146 et 4161.

Avec la capsule
necessaire d'effectuer une correc-

tion qui tient compte de sa sensi-

bilite differente

Ie niveau sonore reel.

a

I'aide de son cornrnu-

d'entree n'est

n'est

que par les

&

Kjaer suivantes:

%"

type 4136, if est

pour obtenir

Bei der Verwendung dieses Verstar-
kers muss darauf geachtet werden,
dass die +40 dB Stellung des
NAGRA-Hauptabschwiichers - durch
ein Dreieck gekennzeichnet - nicht
uberschritten wird. Bei hoheren
Stellungen besteht die Gefahr einer
Ubersteuerung der Eingangsstufe; in
diesem Faile muss der
regler des Mikrophonverstarkers in
eine andere Stellung gebracht wer­den. 1st die Stellung +80 dB
erreicht, so ist der Eingangspegel

nur noch durch die Mikrophondyna­mik begrenzt. Ein dritter Schalter,

gemeinsam fur beide

die

Verstarkunq

Kapseldurchmesser an. Der richtige
akustische Pegel wird somit der Kap­selempfindlichkeit entsprechend,
fur folgende Bruel&Kjaer Kapseln
direkt erhalten:

'A ":

4135

'h":

4133, 4134,4149 und 4163

1 ":

4144, 4145, 4146 und 4161.

Bei Verwendung der. 1/4 "-Kapsel
4136 muss die erhaltene Ablesung
unter

Beriicksichtlqunq

chenden Kapselempfindlichkeit kor-
rigiert werden.

Verstarkunqs-

Kanale,

an den verwendeten

passt

der abwei-

[

[

[

[

r

I
I

SPECIFICATIONS

Power consumption

O.S mA on -10 V

0.3 mA on +120V

Sensitivity of the microphone inputs
for which a direct reading is obtained

1 "position 50
1j2" position 12.5

'/4"

position 4mV/N/m

Frequency response

2.5 Hz to 35 kHz ±0.3dB

Attenuator accuracy ±0.2 dB

mV IN/m
mV/N/m2

I

SPECIFICATIONS

Consommation

O,S mA sur Ie -10 V

0,3 mA sur Ie +120 V

2

2

Sensibitite des entrees microphone
pour laquelle une lecture directe est
obtenue

position 1 "
position

position 1/4

Sande passante

'h"

II

') 1'1H

50 mVIN/m

12,5

4mV/N/m2

7 ::.

11'1I<H'r+0 1 rl R

2

mV/N/m2

TECHNISCHE DATEN

Stromverbrauch 0,8 mA auf -10 V

0,3 mA auf +120 V

Empfindlichkeit der Mikrophonein­giinge bei denen die Ablesung direkt
erhalten wird

Stellung 1
Stellung
Stellung

Frequenzgang

II

%

II

'/4

II

2,5 Hz bis 35 kHz bei ±O,3 dB

50 mV/N/m

12,5

4 mV/N/m

mVIN/m

2

2
2

L

SPECIFICATIONS (Typical Values)
Power consumption on 120V

1.3mA

Frequency response

±0.2 dB from 2.5 Hz to 35 kHz

Equivalent input noise

Measurement taken with
QSJA-BK preamplifier, with
adjustment potentiometer set on
+ldB
A. linear from 20 Hz to 20 kHz

B. ASA A weighted

A

Noise level
Corresponding

sound level with
a lh" cartridge,
sensitivity

12.5 mV/N/m

Input saturation level (potentio­meter on +1 dB) 37 Veff

Corresponding sound level for a

lh" cartridge, sensitivity

12.5 mV/N/m

Dimensions: 31h" x 1

Weight: 4 oz - 110 9

10JlV

2

31 dB

2

80 x 40mm

%"

the-

B

4JlV

23dB

165dB

SP~CIFICATIONS

(valeurs typiques)
Consommation sur 120
Bande passante

2,5 Hz-35 kHz ±0,2 dB

Bruit de fond
Mesure effectuee avec un prearnpli-

a-

ficateur QSJA-B K, potentiornetre
de reglage en position rnediane

(+1 dB)

A. mesure

B. mesure ponderee ASA A

Tension de bruit
rarnenee

Niveau sonore cor-

respondant avec une
capsule lh" d'une
sensibilite de

12,5 mV

Niveau de saturation

(poterrtiornetre de reglage en posi­tion rnediane +1 dB) 37 Veff
Niveau sonore correspondant avec
une capsule lh" d'une senslbilite de

12,5 mV/N/m

Dimensions: 80 x 40 mm
Poids: 110g

lineaire de 20 Hz

a

l'entree 10

2

IN/m

2

31 dB 23 dB

V

1,3 mA

a

20 kHz

A B

IlV

4

a

l'entree

165dB

JlV

TECHNISCHE DATEN

(Typische Werte)
Stromverbrauch 120 V 1,3 mA
Frequenzgang

von 2,5 Hz bis 35 kHz ±0,2 dB

Rauschen

Messungen vorgenommen mit Vor-

verstarker QSJA-B K, Potentiometer

in Mittelstel1ung
A. linear von 20 Hz bis 20 kHz

B.

ASA A bewertet

Rauschspannung

auf den Eingang

bezogen 10
Entsprechender

akustischer Pegel

unter Verwendung

einer1h"-Kapsel mit

der Empfindlichkeit

12,5 mV

Ubersteuerungspegel des Eingangs
(Potentiometer in Mittelstel1ung

+1

Entsprechender akustischer Pegel
unter Verwendung einer
mit der Empfindlichkeit

12,5mV/N/m2

Abmessungen: 80 x 40 mm

Gewicht: 110 9

IN/m

dB) 37 Veff

(+1

dB)

A B

Jl

V

4

JlV

2

31 dB 23 dB

1h

"-Kapsel

165dB

l

[

[

[
[
[

CARTRIDGE
CAPSULE

KAPSELN

BK 1/8"

[ID8]

BK

4136

BK

~

BK

[ID3J

1/4"

1/4"

1/2"

4134
4149~4163

MECHANICAL ADAPTER
ADAPTATEUR M~CANIQUE
MECHANISCHE ADAPTER

PREAMPLIFIER
PREAMPLIFICATEUR
VORVERSTARKER

BK 2618

BK 2615

BK

2619

ELECTRICAL ADAPTER
ADAPTATEUR ELECTRIQUE
ELEKTRISCHER ADAPTER

•...•.+--1

QSJP-BK

1--

II

NAGRA IV-SJ

II

1\

--&--1

OSJA

11

II

II

II

[

"

r

Results obtained on a NAG RA IV-SJ with different values of R 10LF comp according to the used cartridge.

Resultats obtenus sur un NAGRA IV-SJ avec differentes valeurs de Rl0LF comp suivant les capsules utilisees,

Auf einem NAGRA IV-SJ erhaltene Ergebnisse, bei verschiedenen Werten yon Rl0LF comp fUr 1/2" und l"-Kapseln.

8

d

-

5

R,o

LF cornp,

=

3,3 1<0.

I I I I

I I
I I I

/SOPF(I"")

~

/

,

'lapF

3L5 6 8

Rio

LF cornp.

=

2,7 kfl

!"'.

II

-

...•.

/

I I I II

J

SOpF (1""

,.

18pF

_.

-

dB

I'/,

-i.,

-

I

I'-

I

I

o

I

I

f-~

i/

-

_.

!

I

I--

10 Hz 3 4 5 6 8 10 Hz

2

I I

J

('1,"1-

f-

-3

-5

-8

-1

-2

-L

-6

-7

R,o

LF cornp.

=

-

3

2

o

'"

r

"\.

I

r

I

I

II

-

-

2,21<0.

I

J J

I

J J

J J

I I

1'/,')

I

f-

I

I

I

l-

i

I

/SOpFWI

..•.•..
,,-

<,

,8pF

I

I

I

3 , 5 6 8 10 Hz

I

o

dB

I

I

1/

V

I

I

I

I

/

I

I

I..

[

r

.

[

[

I

r

CARTRIDGE
CAPSULE
KAPSELN

BK 1/8"

[IDB]

BK

4136

BK

@1351

BK

!m3J

4134

4149~4163

BK 1"

4144

4146

1/4"

1/4"

1/2"

rmsJ

4161

MECHANICAL ADAPTER

ADAPTATEUR MECANIQUE
MECHANISCHE ADAPTER

PREAMPLIFIER
PREAMPLIFICATEUR
VORVERSTARKER

_Q_J_PA_ ...•.•

I !!_I

II

II

NAGRA IV-SJ

II

QSJA·BK

II

~DJU:CTO

AJUSTE A+16V

,

t

II

+

16V EINGESTELL T

AUF

+

16V

The QJPA is a measurement micro­phone preamplifier for noise analysis

using the NAGRA IV-SJ. It acts as a

low noise impedance adapter and
connects directly to one of the mic­rophone inputs of the NAGRA IV-SJ
recorder. The latter must compulso­rily be fitted with the plug-in QSJA­BK microphone amplifier. Bruel

. Kjaer 1/2" cartridges can be screwed

directly onto the QJPA, while 1/8",

1/4"

and 1" cartridges can be fitted
with the appropriate
adapters. The preamplifier includes a
heating circuit which prevents con­densation from affecting the car­tridge.

Bruel&Kjaer

Le QJPA est un prearnpl ificateur de
mesure utilise pour I'analyse des
bruits avec Ie NAGRA IV-SJ. II fonc­tionne en tant qu'adaptateur
danceafaible bruit et se branche
directement

crophone du NAGRA IV-SJ: celui-ci
doit obligatoirement etre

&

I'amplificateur de microphone
chable QSJA-B K. Les capsulesacon-

densateur Brliel

vissent directement sur Ie QJPA, tan-

dis que les capsules 1/8",

peuvent etre rnontees
adaptateurs

cet effet. Ce prearnplificateur est dote
d'un circuit de chauffage permettant
d'eviter

l'inter ieur de la capsule.

a

I'une des entrees mi-

& Kjaer

Bruel

&

les effets de condensation

a

Kjaer

d'impe-

equipe

enfi-'

1/2" se

1/4"

et 1"

I'aide des

prevus

de

a

it

Oer QJPA ist ein Mess-Vorverstarker
fur die Geriiuschanalyse mit dem
NAGRA IV-SJ. Er wirkt als Impe-

danzadapter mit schwachem Rau-

schen und wird direkt an eine del
Mikrophonbuchsen von NAGRA IV-

SJ angeschlossen, welches obligato-

risch mit dem Mikrophonverstarker
QSJA-BK

1/2" Kondensatormikrophonkapseln

Bruel&Kjaer werden direkt an den

QJPA angeschraubt; die
und 1" Kapseln

diesen Zweck von

gesehenen Adaptern verwendet wer­den. Oer Vorverstarker ist mit einer

He izung versehen, urn Kondensati­onserscheinungen im Innern der Kap­sel zu verhuten.

ausqerustet

konnen

sein muss. Die

1/8",114"

mit den fur

Bruel

&

Kjaer

vor-

[
[

[

[

l

L

The -10V power necessary for this
preamplifier is directly supplied by
the regulated power supply of the
NAGRA. The+200V cartridge
larisation is supplied through the
QJPA by the QSJC plug-in micro­phone power supply, which must be
set to 16V.

SPECIFICATIONS (Typical values)

Cartridges to be used (Bruel&Kjaer) without mechanical adapter
Capsules utilisables
Anwendbare Mikrophonkapseln

With mechanical adaptor
Avec adaptateur rnecanique
Mit mechanischem Adapter

Preamplifier gain G in relation to the type of cartridge
Gain Gduprearnpllflcateur en fonction du type de capsule
G Verstiirkung des Vorverstiirkers in Funktion des Kapseltypes

Input impedance
Impedance
Eingangsimpedanz

. Maximum allowable capacitive load

Charge capacitive maximale admise

Maximale kapazitive Last

Power consumption, -10V of the NAGRA
Consommation sur I'alimentation -10V du NAGRA

Belastung der -10V Speisung des NAGRA

With heating

sans chauffage
ohne Heizung
Without heating

avec chauffage
mit Heizung

Frequency response • at±1 dB
Courbe de

Frequenzgang •. bei±1 dB

d'entree

reponse

(Bruel

*

po-

&

Kjaer) sans adaptateur rnecanique

(Bruel &

a

±

1 dB

L' alimentation -10V necessaire au
prearnplificateur est d irectement
fournie par I'alimentation regu!ee du

NAGRA. La polarisation

la capsule est

QJPA par I'alimentation de micro-

phone QSJC enfichable dans Ie

NAGRA, qui doit prealablernent etre

ajuste

SPECIFICATIONS (valeurs typiques) TECHNISCHE DATEN (Typische Werte)

Kjaer) ohne mechanischen Adapter

Die

notiqe

starkers
regulierten Speisung des NAGRA

+

200V de

assureeatravers Ie

a

+

16V.

qefuhrt.

spannung der Mikrophonkapsel wird

uber

speisung zugesichert, das auf+16V
eingestellt
NAGRA

1/2" Types 4133, 4134, 4149, 4163

1/8"

Type 4138

1/4"

Types 4135, 4136

1"

Types 4144, 4145, 4146, 4161

'"

-0,1

2

GnlO,8 pF

2

nF

Versorgung des Vorver-

mit -10V wird direkt von der

Die+200 V Polarisations-

den QJPA von der Mikrophon-

ist,

mit welcher das

ausqerustet

'/2"

-0,4

1/4"

-1,1

sein muss.

1/8"

-2

[

zu-

[
[

I

L

[

L

33mA

70mA

3 Hz - 35 kHz

I

,

Maximum allowable input level with
Niveau maximal admissible

it

l'entree

1/2"

cartridge

avec caosule

1/2"

150 dB

I

I

I
I

I

Measuring preamplifier for Brliel

Kjaer condenser cartridges. Contra-

ry to the former model (OSPB), this

,I

preamplifier is interchangeable with

&

Brliel
2619,2615,
in switch enables the adaptation of

I

the used cartridge K factor, in a -

dB to+4

SPECI FICAT IONS
. low noise and high input impe-

I

dance

wide dynamic range for noise mea-

surement

- usable with cartridges of different

J

diameter

- K factor adaptation

- compact

- low power consumption

Kjaer preamplifiers No.

etc. Moreover, a built-

dB range.

iNAGRAi

"'i-1il

!-l3!

1

• \ } II

'JIRt==S ~

ZUBEHOR

B..JPA

EXTERNAL MICROPHONE PREAMPLIFIER

FOR USE OF BRUEL

&

2

Preernplificateur de mesure pour
capsules

Kjaer. Contrairement
version (OSPBl. ce
est interchangeable avec

Brliel

De plus, un reglage

met I'adaptation du facteur K de la
capsule utilisee dans une plage de

- 2

SPECIFICATIONS

- faible bruit et haute impedance

dentree

- dynamique elevee pour les mesu-

res de bruit

- utilisable pour differents diame­tres de capsu Ie

- reglage d'adaptation du facteur K

- faible encombrement

- faible consommation

&

a

+ 4 dB.

a

condensateur Bruel

preemplificateur

Kjaer No.

2619, 2615,

incorpore

a

I'ancienne

les

rnodeles

etc.

per-

&

&

KJAER CARTRIDGES

WITH NAGRA IV-SJ

Mess-Vorverstiirker zur Anpassung

von Bruel&Kjaer-Kondensatormi-

krophonkapseln. Entgegen der ehe­maligen Version (OSPB) ist dieser
Mess - Vorverstiirker auswechselbar
mit den Modellen
Nr.

2615, 2619,
erlaubt eine eingebaute Regelung
die Anpassung des Faktors K der
verwendeten Kapsel im Bereich von

- 2 bis

+

4 dB.

MERKMALE

- Vorverstiirker mit schwachem Rau­schen und hoher Eingangsimpe-

danz

- Grosse Dynamik fUr Gersuschrnes-

sungen

- Verwendbar fUr verschiedene Mi-

krophonkapseldurchmesser

- Anpassungs - Regelung des Fak-

tors K

- Kompakte Bauweise

- Geringer Leistungsverbrauch

Bruel

&

Kjaer

u.s.w. Ueberdies

,0

I

,

I

I

,

,

,

INAGRA~

CH-l033 CheseauxILausanne

NAGRA IV·SJ

Configurator

,

,

I
I

••

fill!

~

fi120I

~

14130

OSET

OLEN

••

\l

~mechanical accessories

\l

{\~

..

90801-2 1

M~

~

~
~

Y

14650

OTIM ORAC

v

OCA

r;p

CJ

\l

I

Power supply and accessories

<l
<l

IOGBA I

r14006

OGBN

14005

OGBC

114001

LQGB

I

I~

I

• power supply

=.

~

14350

ATN-2

~~CAS

I

IOCAWln

f9aOo3l

r------\.-~I-----.

982f"=l 198254

PD

I-t--i

OSV-2

I

PA-4

I

I

r;J1

PA-R

14700

DSM

T

17910

IACC

f

/98001

OCAS

f98003l

\OCAWr-

I--(

or

KEY

Electro connections

I

I

INAGRA~

CH-l033 Cheseaux/ Lausanne

I

I

13429

SLQ-3

13400

SLO

synchronization

NAGRA IV·SJ
Configurator

Modulation and synchronization

I

I
I

I
I
I

I

~

16300

QCLS

I

Internal electro accessories

I

01165

16350

OSLS

1-

14600

QSV·2

I

16450

QSSF OCJE

lin~lout

01128

OSJC

01110

11900 11901 16001

line in CUE

OCJC

06780-1 06698-9

QFMS

OSGX

OSCM

~

I

16415

OSSC

I

QSJABK

OSJAMKH

,

.

I

I

n

I

tl

I

I

I

,

'I

I

I

11001

_ on special order only

replacedbyQJPA

4~

r

I

11001

QSPS-

~

~

11025

QSJP

~

-

QJPA

1050

r

QSJP GR

~

I

~

~

GR GR

QSJP GR

4

t

B&K

1050

r

Bruel et Kjaer

QJPAQSJP

I

4t

1902

r

OCJ MKH aCJ MKH

MKH110 MKHll0

""'-KEY

Electro connection

Operating requisites

Cartridge B&K

Preamplifier B&K

I

r

1902

I

-.

•

6.

I

r

It

1ft
1ft

o

.,

•••

It

1ft

-

z

.

~

-t

. ::I

~

-t

-

o

Z

3

~

Z

C

~

,.

__ ~ ~ __ •••). ~~~_3!",!!,,", ...

_4~...

23!!3!'!!!'.~22§ __. ~~~~~ ~~-

,

I

,

-,

I

·-1

fa

,.

I

-,.

I

cells. The manufacturer of NIFE accumulators
estimates that 1,000 charge cycles can be obtained.

Temperature
Excellent performance at high or low temperatures:

EVEREADY indicate: normal discharge between

0

F (_20° C) and 104° F (+40° C) and possibly up

4
to 1580F (+71° C) for short periods. NIFE indi­cate use at 22° F (_30° C) and authorise storage
between _40
all manufacturers are agreed that storage at above
68° F (+20

Recharging
Basically, an accumulator should be recharged with

a current equal to one-tenth of its nominal capacity,

i.e. 0.2 A for a 2 Ah cell. The PAR charger supplies,

with an ATN or ATN2 power supply, a charge of

0.25 A. sufficient for recharging a medium-capacity
accumulator in 12 to
if the charge continues after the accumulator has
regained its normal capacity, there is no risk of
deterioration. Some accumulators can be charged

rapidly on the condition that they are completely
discharged beforehand; a NIFE RC40 accumulator
can thus be recharged in one hour with 4 A. In this
case it is essential to stop charging as soon as the
accumulator is completely recharged in order to

prevent serious damage.

Danger of Polarity Inversion

In NAG RA recorders the 12 cells are connected in
series. Anyone cell which has a slightly lower
capacity than the others will be the first to become
completely discharged. The current from the other
cells will then flow through this cell and invert its

polarity, which may seriously damage it. Certain

types of cell are protected against inversion: for

instance, the EVEREADY C2 can take an inverse
current of 200 mA for 5 hours without any ill
effects. The inversion of one cell produces a total
voltage reduction of about 1.2 V. i.e. 0.1 V per cell.

If discharge is stopped systematically whenever the

meter shows 1.1 Vlcell, there is practically no risk
of inversion.

WARNING
Well-charged accumulators must never be mixed

with partly or fully discharged ones in the same

recorder as this will make it difficult to estimate

how long they can be used or recharged. and also

increase the risk of polarity inversion. A set of

12 accumulator cells is to. be considered as a single

unit which should always be charged and discharged

as such. If necessary, unmatched cells can be used

if each one is discharged beforehand through a

resistor of a few ohms or a bulb; the cells should be

recharged as one unit.

Storage

Some manufacturers advise the storage of nickel-

cadmium accumulators in a state of discharge, as a

chemical reaction may shorten their life if they are

left to discharge by themselves. EVEREADY advise

0

F (-400C) and 122° F (+50

0

C) shortens the life of accumulators.

14

hours. With this current,

0

ci.

but

the following procedure for charging cells which
have been left to discharge themselves: beyin by
accelerating the discharge with a current between
one-tenth and one-half the nominal capacity in Ah,
then recharge at half the normal charging current,
i.e. one-twentieth of the capacity in Ah. Charging
time should be between 28 and 30 hours. After
this first recharging phase the total capacity cannot
be reached and a second discharge/recharge cycle

is necessary. By analogy NIF E accumulators will

be rechargeable with 0.25 A, the normal current of

the PAR charger.

In general, storage at below 70° F (+20° C) is
recommended, as the cold slows down all chemical
reactions. A refrigerator would seem to be the
ideal storage place.

Danger of Explosion
Even though most cells are fitted with a safety
valve to evacuate gases which may be produced
inside them. there is still a risk of explosion. Three
basic rules should be observed in order to eliminate
this risk:

- never recharge with a current higher than one­tenth of the nominal capacity in Ah (higher
than 0.35 A for NI FE, 0.25 A for

LECLANCHE and 0.2 A for EVEREADY)

- never recharge with inverted polarity caused
either by an error in connecting the cells or by
spontaneous inversion (see above)

- never throw used cells into a fire.

10.

Length of Useaccording to Type of Cells Used
(See table overleaf)

11.

Equivalent Types of Cells

Carbon-zinc batteries:

EVEREADY 1150
WONDER (Export and Marin)
PERTRIX 222 and 232

LECLANCHE Suisse no. 800

Manganese dioxide batteries:

EVEREADY E95
MALLORY Mn-1300
WONDER Amiro 1.5and Judit 1.5

Nickel-cadmium accumulators:

2-2.5 Ah: EVEREADY C2

LECLANCH~ 32 A 60

3.5-4 Ah: EVEREADY NH4
SAFT VR 4 D

PHILIPS
NIFE RC 40

L

5. REWIND AND RAPID ADVANCE

After completing a recording turn main switch 4
back to TEST; if the series of recordings and
measurements is finished. turn the switch to STOP.

5.1. Rewind
Pull down the head shield, pull lever 32 fully to the

left and place main selector switch 4 on TEST. then
push switch 23 to the left onto REW.: the tape
rewinds onto supply reel 24. After rewinding the
tape, reset switch 23 in the vertical position, put
main switch 4 on STOP and remove the reel. In
the case of partial rewind, wait for the tape to stop

running, push lever 32 to the right to its fullest
extent and raise the head shield; the recorder is then

ready for playback or to make a new recording.

The tape can be rewound when main switch 4 is in

any position except STOP. This means, for example,
that the tape can be monitored during rewind to
pinpoint the beginning of a sequence: the main
selector must then be on PLAYBACK with Loud­speaker and the head shield must be raised
before switch 23 is turned to REW.: the recorded
signals, played back rapidly and backwards, are
transmitted through the loudspeaker. To monitor
on the headphones only, rewind with the main
selector switch on PLA YBACK.

5.2. Rapid Wind

It is possible to increase the winding speed of the
tape, to find a particular sequence, for example.
The tape can be wound rapidly on PLAYBACK with

Loudspeaker only: with lever 32 pushed to the

right to its fullest extent, set main switch 4 on

PLAYBACK with Loudspeaker; the tape winds at

its normal speed. Flick switch 23 to the right: the

tape winds rapidly. When the required spot on the
tape is reached set switch 23 in the vertical position

and quickly turn the main selector switch to STOP.

6. PLAYBACK OF RECORDED SIGNALS

6.1. Direct Playback
With lever 32 pushed back to the right to its fullest

extent, set switch 1 on TAPE and mai n selector
switch 4 on PLAYBACK. The tape begins to move

and the recorded signals are present at the outputs:

Connector 43: 100 mV line output voltage for a
recording level of
level indicated on PEAK): the input impedance of
the accessories connected to this output must be
higher than 10 kil.

Banana jacks 45 and 46: same characteristics as for
connector 43.

MUltiple connectors 41 and 42: playback output

voltage 10 mV for a 0 dB recording level, on con-

tact 4, ground on contact 7; the input impedance of
accessories connected to this output must be higher
than 47 kil.

For simultaneous monitoring on the headphones,
use selector 18 to select the channel; adjust the
loudness with potentiometer 19. For loudspeaker
monitoring set main selector switch 4 on PLAY-

BACK with Loudspeaker and use selector 18 to
select the channel; the loudness is not adjustable.
Care should be taken that switch 23 is not flicked
to the right, which would put the tape on rapid
wind (see 5:2.).

The output level reading can be obtained by hold­ing switch 2 on TAPE during playback; as during

recording, selector 12 determines the type at" read­ing, PEAK or RMS

6.2. To Reintroduce a Signal into the Direct Chain

On playback. the recorded signal can be reintro-

duced into the line input of the corresponding

channel by screwing a strap plug onto the multiple

connector (41 or 42) of the channel, which connects

contacts 4 (output) and 1 (input) to each other.

Input selector 9 or 10 must be on LINE and switch

1 on 01 RECT. In fact, the recorded signal passes
through the whole direct chain, attenuator and
filter again and is present at the line outputs,
connector 43 and banana jacks 45 or 46: it can
therefore be attenuated and filtered a second time.

At the line output the playback level (switch 1 on

TAPE) is equivalent to the level after reintro­duction into the direct chain (switch 1 on 0 IREeT)
when attenuator 6 or 7 is on +20 dB or 0.01 V. and

vernier attenuator 6A or 7A is onO.A signal recor-

ded at 0 dB produces a 10 mV voltage at the output

of multiple connector 41 or 42; this voltage reintro-

duced at the line input gives a reading of 0 dB

attenuator is on 0.01 V.

a

dB (20 dB below the maximum

if

the

(

[

[

[

[
[
[

[

[

[

[

r

4.4. To Check the Tape Transport Mechanism:
Set switch

PLAYBACK: the tape begins to run.
SPEED

when three conditions are fulfilled simultaneously.

i.e. when

1. the power supply voltage is not below the

2. the motor speed corresponds to a nominal

3. the tachymetric speed fluctuation is not

Indicator
parameters does not remain within the admissible
tolerances.

The red needle of meter 14 indicates, on the lowest
scale, the unstabilized battery voltage expressed for
one cell; the total voltage is obtained by multiply-

ing this reading by 12.
The green needle shows the voltage across the motor

on the same scale. The difference between the two
readings corresponds to the reserve of voltage
available.

Set switch
then shows the current through the motor on the
0-100% scale. 100% corresponds to a motor
current of 250 mA; the nominal current is about
30 to 40%.

If possible, a lamp supplied from the a.c. mains
should be shone on stroboscope 27; the mains
frequency must correspond to the value marked on
the stroboscope. Observe the serrated discs: for

each of the three higher speeds one of the discs
should appear to be stationary, thus showing that
the tape speed is correct; however, this reading
depends on the accuracy of the mains frequency,
the tolerance of which may reach ±1%.

4.5. Meter Selection

Refer to the instructions given in Section 1 concern-

ing the two methods of indication' RMS and

PEAK. The peak voltage reading on the PEAK

scale is the most valid during recording, as it makes

it possible to avoid tape saturation, whatever kind

of signal is recorded.

4.6. Recording of the Reference Signal

Before recording a signal which is to be analyzed

later it is advisable to record a known signal so that
the equipment used for analysis can be calibrated
accurately, The built-in oscillator supplies a
reference signal calibrated at +10 dB, which is
applied, after the attenuator, to the direct ampli-

12

on BATT. and the main switch on

&

POWER indicator16shows a white zone

minimum admissible value

tape speed

exceeding its maximum value.

16

becomes black if one of the above

12

on M. The red needle of meter

14

fier and which will be mixed with the input signal;
the latter should be sufficiently attenuated not to
interfere with the measurement.

Turn main selector switch 4 to TEST; allow the cir-

cuits to be stabilized for about ten seconds, then

switch to RECORD; the tape begins to run. Press
button
gives a reading of +10 dB on PEAK or on RMS
according to the position of switch
reference signal can be monitored on the head­phones; adjust potentiometer
ness in relation to the meter reading.

While pressing button 8, push switch 2 to the left
and hold on TAPE. Meter 14 must give a reading of
+10 dB at
±1 dB for the other three speeds, if the tape used is
the one for which the recorder has been adjusted.

Release switch

selector switch14on STOP.
Note: The reference generator can be used to

record beeps which, superimposed on the signals to
be analyzed, will make it easier to identify sequences
or locate certain phases in the measuring process.
The beeps can be generated using a remote control
cable connected to PILOT connector 44: a positive
voltage, between +5 and +30 V, applied to terminal
2 (CLAPPER) switches on the generator. If certain
parts of circuit A24 are modified (3rd track), the
beeps can be controlled by the supply voltage of
the recorder (-10V), applied to terminal 2.

4.7. Recording of Signals for Analysis

4.7.1. Recording Level
In order to obtain the best possible siqnal-to-nolse

ratio, the recording level must be very close to the
+20 dB maximum level on PEAK and +10 dB on
AVERAGE. This 'maximum level, which corres­ponds to a' tape flux of 320nWb/m, should not be
exceeded as this will cause considerable distortion
of the signal due to tape saturation. The reading
given on PEAK, which corresponds to the peak
value of the sig'nal whatever its shape, makes it
possible to avoid saturation completely.

4.7.2. Recording Equalization
Another factor which could cause tape saturation

should also be taken into account: treble pre­emphasis.

Magnetic tape is used for recording and playback
following the same procedure as with a conven­tional sound recorder. Signals are pre-emphasized
on recording and de-emphasized on playback, accor­ding to their frequency: this considerably improves

the signal-to-noise ratio. The distribution soectrurn
of signals encountered during noise measurement -

8

of the reference oscillator. Meter 14

12.

19

to obtain a loud-

+0.5

dB for a tape speed of 15"/s and at

2

and button

8

and reset main

The

(

r

,

I

[

[

..

,

~

[

[

r

L

3.6.3.3. Limits and Corrections with the MKH 110
Microphone and the QSJA-MKH
Amplifier

The QSJA·M KH amplifier does not in any way alter
the performance of the microphone and its elec-

tronic circuit'; reference should be made to the

sound level limits indicated by the manufacturer
for saturation and background noise.

Correction: With the MKH

60

decibels to the value set on main attenuator

and to the value shown by meter

MKH

110-1

microphone add80dB.

3.6.3.4.

As the QSJA-BK amplifier is being used, the same
limits and corrections as those given in paragraph

3.6.3.2.

TheGvalue, which represents preamplifier gain in
relation
following table.

Limits and Corrections with the
1560-P42

are valid.

to

the type of cartridge, is shown in the

Type of cartridge

GENERAL RADIO Amplifier

110

microphone add

14.

With the

[
(
(

7

(

I

I

I

G

in dB

IMPORTANT

In all cases where there is uncertainty about the
sensitivity, the K correction factor of the cartridge,
or the gain of the input circuits, we recommend the
useof a calibration device. This device is applied to
the cartridge and produces a calibrated sound level
of a precisely known value. The Bruel&Kjaer
pistonphone and the acoustic calibrator produce a
fixed frequency signal; with calibration equipment

using an electrostatic actuator for condenser micro­phones it is possible to calibrate at different
frequencies.

-2.5

-6

I

3.6. Calculation of the value Measured

3.6.1. Measurement of High-level Signals by the
Line Input

A 1 mV sine wave signal applied to the line input
gives a reading of OdB on the PEAK scale or on the
RMS scale, when main attenuator 7 is on

V or 0 dB.

0.001

Meter 14 is graduated in decibels only; since the
value indicated by main attenuator 7 corresponds
to a reading of 0 dB on the meter, the exact value
of the signal - in decibels in relation to the 0 dB

reference level - is obtained by adding algebraically

the value shown on meter 14 to the value shown on

main attenuator 7 and, when necessary, on vernier
attenuator 7A. The number of decibels obtained
should then be converted into a voltage ratio, and
the line input voltage deducted from the 1 mV

reference voltage.

It is a convention in electro-acoustics to express

measurements taken at peak value in terms of the

RMS value which would be given by a sine wave
signal with the same peak value; the input sensitivity
and the output voltage of the recorder are therefore
expressed in terms of their RMS value, assuming the

signals are sine wave.

On RMS the measuring circuit of the recor­der responds to the average value of the signal and
indicates, after decibel/voltage conversion, the RMS
value which would be given by a sine wave signal of
the same average value.

On PEAK, the measuring circuit of the recorder
responds to the peak value of the signal and
indicates, after decibel/voltage conversion, a value
which is the AMS value of the signal only if it is a
pure sine wave; the actual peak value, whatever the
form of the signal, is obtained by multiplvinq the
value indicated by 1.414.

A 1 mV RMS sine wave signal applied to the line
input, with the attenuators on 0 dB, gives an iden­tical reading on PEAK and on RMS ,which
is equal to 0 dB, i.e. the 1 mV AMS reference
voltage.

A signal without a well-defined form, applied to
the line input, gives the following values after
decibel/voltage conversion of the reading:

- on PEAK, peak value divided by 1.414

- on RMS average value multiplied by

1.11·; in practice, this reading differs from
the RMS value reading only in the signal form
factor; the margin of error can reach 1 dB for
gaussian noise.

The line input impedance is 100 kf2. On the maxi-

(9

mum sensitivity position
in input noise as long as the sound source irnpe­dance remains low in relation to the 100 kf2 input

impedance.

_1_.~=1."

.fi.

2

dB) there is no increase

Select the attenuator position for which the needle
of the meter shows the closest possible value to

+10 dB RMS or +20 dB PEAK, without

exceeding this limit. The attenuator knob then

indicates a decibel value which, when added to the
value shown by the needle, makes it possible to
determine the voltage applied to the input, i.e. for
xdB:

.!.

input voltage in millivolts

Basically, vernier attenuator 7A remains on 0 dB

(GAL.). With this attenuator it is possible to make
a fine adjustment, if necessary, in steps of 1 dB: the
value shown by its switch should be added to that
of main attenuator 7.

The graduations in dB of attenuators 7 and 7A and
meter 14 are also usable for relative measurements
without pinpointing the reference.

3.6.2.

Proceed in the same way as described in the pre­ceding paragraph, but with selector

3.6.3. Measurement of Low-level Signals by the

The sound level, measured in decibels, in relation
to the
algebraic sum of the values indicated by gain selec­tor 39, main attenuator 7, vernier attenuator 7A,
the reading on meter 14 and a specific correction
value given according to the cartridge and amplifier

circuits used.

The correction value includes, amongst other things,
a correction factor Ko. This is the difference,
expressed in decibels, between the sensitivity of a
standard cartridge (50 mV/N/m
sensitivity measured in the laboratory by the manu-

facturer. The Ko factor is given in the calibration
chart issued with each Bruel
cartridge.

To facilitate the reading of meter 14 the needle

should be as near as possible to the

or +10 dB RMS values, without exceeding

them. If the signal is too weak when attenuator 7

is on +20 dB, turn the knob to the right; if the

reading is still too low when the attenuator is on

o

'If necessary, readjust main attenuator 7.

Measurement of High-level Signals by the
Microphone Input

Microphone Input

2.10-5N/m2reference level, is equal to the

dB, turn gain selector 39 from +60 dB to +40 dB.

It

the signal is too strong when attenuator 7 is on

+20 dB, turn its knob to the left; if the reading is

still too high when the attenuator is on

(marked with an arrowhead), move gain selector 39

from +60 dB to +80 dB.

=

10

20

10

on MIKE.

2

)

and the actual

&

Kjaer microphone

+20 dB PEAK

+40 dB

I
I
I

2.6. Connection of General Radio 1560-P42
Preamplifier fitted with a Microphone
Cartridge

This preamplifier can be fitted with the same car­tridges and mechanical adapters asthe Bruel&Kiaer
2619 preamplifier. Its output plug fits into the
input connector of the QSJP-GR adapter; the out­put connector of this adapter must be plugged into
microphone connector

on MIKE.

Preamplifier 1560-P42 can also be fitted with

GR 1" and GR

When Brliel&Kjaer cartridges are being used the

recorder should be fitted with the QSJA·BK
amplifier and QSJC-power supply, version 2 only,
which should be modified to supply the +16 V
voltage required for the GENERAL RADIO pre­amplifier.

Version 2 of the QSJC power supply differs from
version 1 (which can supply only +12 V) in the
value of certain components, e.g. resistances R24
and R25:

1/2"

37;

selector 10 should be

ceramic microphone cartridges.

R24

L

(

[

[

[

l

[

R25

@

@
@

o

@

@

R26

Version 1: R24=33

no modification possible

Version 2: R24=47

modification possible

It is not possible to transform a version 1 circuit
into version 2, as the oscillator coil of the converter
is different in each case.

Before modifying a version 2 circuit, it is essential
to measure the negative voltage available at terminal
6 of connector CUE 47, in relation to the ground

(terminal 7) with no modulation. Bridge terminals
5 and 2 and set main switch 4 on TEST; note the
value of the negative voltage at terminal 6 (seepara­graph 7.6 for the meaning of this value).

To obtain a +16 V voltage, remove resistance R26

(180

kill.

which is soldered to two pins;itis not

necessary to dismantle the circuit.

After this modification has been made, the voltage

available at terminal 6 of connector CUE 47 should

be adjusted to the value noted before the modifice-

tion was made: this can be done bv adiust ino

k!1,

k!1,

R25=27

R25=33

R27

k!1

k!1

o

potentiometer R83 of circuit A24 (TH I RD TRACK
CI RCUITS). If it is impossible to.obtain the value

noted, replace resistance R82 of this circuit by a

10knresistance and adjustable potentiometer R83

by a 2.2knmodel.

Signals and Voltages

Chassis connector external side or plug soldering

side

r----.,..-

-10G-----'

GND

SIGNAL

"'---+16V

[
[

2.3. Connection of the QJPA Preamplifier fitted

&

with a Bruel

Kjaer Microphone Cartridge

Bruel&Kjaer W' 4133, 4134, 4149 and 4163
microphone cartridges screw directly onto the QJPA
preamplifier, and the preamplifier output plug fits
into microphone connector 37. Other cartridges
can be screwed on using a mechanical adapter, i.e.

-1 ":

4144,4145,4146 and 4161 type

- % ":

4135 and 4136 type

- lAl":

4138 type.
The 25 or 50m. QCPA extension cable can be
inserted between the output plug of the QJPA pre­amplifier and the microphone connector.

Set selector switch 10 on MIKE. The recorder must
be fitted with the OSJA BK microphone amplifier
and the QSJC universal power supply.

Installation of aSJA-BK Amplifier

Lock the lid of the recorder, turn screws 50 several
times and open the case to its full extent. Unscrew
the connector between the microphone input wiring
and the case interconnection board. Plug in and fix
this connector to the microphone amplifier and
secure the latter to the case interconnection board.

Unscrew the level adapter board A. Carefully
position the metal ground strap B and slip it under

the ground comb C. The-three switch spindles D
should be passed through the corresponding holes

in the box, then the blocking rings E threaded on.
Introduce the spindle into the switches, press the
rings against the ground strap and tighten them.
Place the shield in position and fix it under the

ground comb and under a nut screwed onto one of

the two hinge fixing screws (this screw should be
longer - M3x8). Reinstall the level adapter

board A.
Installation of OSJC Power Supply
Plug in the power supply circuit and fix it with

screw G to the connector. Pass a M2x6 flat head
screw through from the inside of the battery box
and through the bracket of the metal box, and fix
with a nut.

o ~

: _ 0

o

0

::

..

:

.~--;-

c ~~.

Signals and Voltages
Chassis connector external

side.

+200V·---- ...•

+

120V-- _

-10G

..t::

:It·

..-:

,-'"

~

.

A

F

----J

0

side or plug soldering

,..-----T-GND

SIGNAL

+12,11V

M2x6

[

[

[
[

Ii

'I

[

[

,

[

•

r

1. BASIC EQUIPMENT

1.1. Installation of Batteries or Accumulators

Select the type of battety or accumulator accor­ding to the expected working conditions for the
recorder (see Section 4) . Turn the recorder over so
that it is resting on its lid; turn the screws marked
A and remove the cover of the battery compart­ment. Insert the 12 cells in the position shown,

+ +

~

INSTRUCTION MANUAL

Directions for use

1.4. To Check the Power Supply:
Turn METER FUNCTION switch 12 to BATT.

and main selector switch 4 to TEST: the red needle

of meter 14 indicates on the lowest scale the un­stabilized battery voltage expressed for one cell:
the total voltage is therefore obtained by multiply­ing the meter reading by 12. The pointer at 1.25 V
indicates the minimum voltage at which the man­ganese dioxide batteries should be recharged so that
they are able to go through the discharge/charge
cycle several dozen times (see Section 4). Turn
main selector switch 4 back to STOP.

o

~A

0

0

then replace the cover and secure it by turning the
screws marked A. Set POWE R switch 3 on Batt.

1.2. Connection of an External D.C. Source
Connect the 12-30 V voltage source to the POWER

PACK connector 48, with the negative pole to pin 5.

Set POWER switch 3 on External.

1.3. Connection of Mains Power Supply

Connect an ATN 2 mains
power supply to the POWER PACK connector 48.

If necessary, check the position of the voltage selec-

tor. Set POWE R switch 3 on External.

I.

Ar::9

2. CONNECTION OF SIGNAL SOURCES
Since the two direct recording channels are iden-

tical. instructions are given for channell only, but
they are also valid for channel 2.

2.1. Connection of a High Level Line
The recorder can be connected to an appliance or a

measuring instrument, the output voltage of which
is equal to or higher than 1mV RMS: input is direct
on the main attenuator and input impedance is

100kU.

The lower the output impedance of the signal
source, the better the signal to noise ratio is.

The external signal source is connected to connec­tor 42: the wiring of the corresponding plug is
shown in General View " on the inside cover.
Selector 10 will then be on LINE.

2.2. Connection of a High Level Microphone or
Transducer

Input identical to 2_1., but using connector 37,
with selector 10 on MIKE. The wiring of the plug
is shown in General View II: only contacts 4, 5, 7
and 8 can be used; contact 3 supplies a
stabilized voltage which can feed an external pre­amplifier, if desired.

-10

V

I

I
I

I

I
I

'I

I
I

dB

.10

-10

-20

-30

-40

-50

WeI.htIM curve C

I

0

/'"

/

-

---

-.....

......

..••."'-

Hz

3150

20

31,5

80

50 100

200

315

500

800

1000

1200

5000

8000

10000 20000

12500

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unweighted RMS value, in accordance with NAB
standard:

15 ips

7lh ips

33f4

ips

11h

ips

Starting time

DIRECT RECORDING TRACKS

Amplifier chain (without microphone amplifiers)

Input impedance 100 kn

Overall accuracy of the attenuator ±0.1 dB

Frequency response

from 2.5 Hz to 35 kHz ±0.3 dB

Input voltage for recording at Maximum Peak
Level, maximum sensitivity 10 mV

Maximum admissible level for a distortion of 1 %
in relation to the Maximum Peak Level +8 dB

Signal-to-noise ratio

linear 66dB
ASA A weighted 74 dB

Crosstalk attenuation at 1 kHz 80 dB
Weighting curve accuracy better than CEI179 and

ISO 1761 (for exact curve see diagrams)
High pass filter

attenuation

Control Instrument

PEAK indication

semi-logarithmic scale, usable from -10 to
+23dB

frequency response

from 10 Hz to 35 kHz

integration time for 2 dB
below reference deviation

RMS (sonometer) indication

normalised scale, usable

frequency response
from 10 Hz to 35 kHz

FAST integration time,
200 ms for 1 dB
below reference deviation

SLOW integration time,
500 ms for 4 dB

below reference deviation
FAST integration time,

200 ms for - 1dB

reading accuracy below 0 dB

3 dB at 20 Hz, 12 dB per octave

2,5

kHz

from -10 to +12dB

above OdB

±0.06%
±O.08%
±0.13%
±O.19

3

seconds

-3

±0.5dB

5 ms ±20

±0.5 dB

±0.5 dB

±0.5 dB

iO.5 dB

±O.5dB

-o.zee

dB

Recording
Nominal recording level, identical to Maximum

Peak Level (M.P.L.1
Bias frequency 150 kHz

%

Bias switchable according to the tape used, with
five possible values

Tape used for testing for CCIR

Erase efficiency in relation to M.P.L.

Frequency response, recording at 20dB below M.P.l.

15

7lj2

3%

* 1 ~ ips - 3.8 crn/s 25 Hz to 3.5kHz

*recording possible from 2.5 Hz and transposition

to 15 ips for restitution

Third harmonic distortion at M.P.l.
Signal-to-noise ratio

15 ips - 38 cm/s

71h

Crosstalk attenuation

at 1 kHz

at 10 kHz

Phase fluctuation between tracks

at7

and

Plavback

=

320 nWb/m for NAB
405 nWb/m for

. for NAB

ips-38 cm/s 25Hz to 35kHz

ips - 19 cm/s 25 Hz to 20 kHz ±1.0 dB

ips -

9.5

cm/s

ips -

19

cm/s

1

/

ips (19 cm/s] and 10 kHz

z

25 Hz to 10 kHz ±1.5 dB

NAB
CCIR
NAB
CCIR

linear

55 dB
57 dB
59dB
59 dB

eel

R

3M 177

LPR 35LH

BOdB

ASA A

Weighted

62dB
64dB
64dB
61dB

60dB

50dS

1.5

I

I

I
I
I

%

I
I

I
I

Outputs

2.5 V

o

to

17 kHz

1 V

I

1 V

(

lW

(

2%

I

Output voltage at M.P.l. on 10 kfl

%

Output voltage for 1%distortion at 1 kHz
Output voltage for 200 n headphones,

adjustable

Built-in loudspeaker,

power output of amplifier

Reference signal level

RMS

FM TRACK
Working speeds, 15 and 71h .ps - 38 and19cm/s

Carrier frequency
Static linearity

+10dB ±0.1 dB

J

INSTRUCTION MANUAL

2

Specifications

J

]

]

DIMENSIONS AND WEIGHT
Dimensions of the box as such with the lid closed,

without knobs, feet, handle or handle mounts

12.6 x B.8 x 4.4" - 318 x 222 x 110 mm

]
]

]

Overall dimensions without the removable handle

13.2 x 9.6 x 4.S" - 333 x 242 x 113mm

Thickness of the Anticorodal sheet used for the box

.OBO" -

Thickness of the tape deck .120" -3mm

Empty weight, without batteries or tape

141bs - 6.150 kg

Weight with ordinary batteries,

5"

reels and tape

16 Ibs - 7.300 kg

2mm

MAGNETIC TAPE
Nominal width

Admissible thickness 0.5 to 2 mils - 12 to 50 lAm
Maximum reel diameter with lid open

Recording time at

Maximum reel diameter with lid closed

Recording time under the same conditions

Rewind time with S" reel and 35 lAm (1.S mils)

tape 2 min.

71h

ips with35lAm (1.5 mils) tape

V-I" -

6.25 mm

7" - 178mm

45 min.

5" - 127mm

22 min.

]

]

]

-

POWER SUPPLY

Supply voltage, direct current, positive to the
ground 12 to 30

Current consumption

on Test
on Line Playback
on Record direct

mic. (1 BK 2619)

on Rapid Rewind

Type of batteries used (12 cells)

CEIstandard
ASA standard

Approximate length of battery life with Eveready

E95 manganese dioxide alcaline batteries

Continuous use, recording
direct

with mic. and 2619 preamp.

120mA
20SmA

260mA
465mA
305mA

R20

o and L 90

26 hours

11Yohours

TAPE TRANSPORT
Switchable nominal speeds:

15 ips 38.1 cm/s

71h

V

Stability of the nominal speed in relation to the
temperature (within the specified rangel. the posi­tion of the recorder, the distribution of the tape
between the reels, and the supply voltage (except
on , Ih ips] ±0.1

Wow and flutter

weighted peak-to-peak value, in accordance with
DIN 45 507 standard:

ips 19.05 cm/s

3% ips

,1/

2

15 ips

71h

3% ips

llh ips

=

9.525 cm/s

ips 3.81 cm/s

ips

%

100.05%

±D.Ol

±0.12

±D.25 %

%

%

.l

INSTRUCTION MANUAL

I .,..

]

o

]

]

MEASUREMENTS

]

]
]

SPECIFICATIONS

DIRECTIONS FOR USE
BATTERIES AND

ACCUMULATORS
ACCESSORIES

chapter 1
chapter 2
chapter 3

chapter 4
chapter 5

-

"'-../

....•

...•

NAGRA Tape-recorders Manufacture

KUDELSKI SA

1033 CheseauxILausanne

Switzerland

Phones: 021 9121 21

Telex: 24392

Printed in Switzerland

new edition, october 1978.

NAGRA. KUDELSKI. NEOPILOT. NEOPILOTTON,

I\ll\rr)

"f"''T"''"T.r~ ••,

by

KUDELSKI S.A.

/'0

ron" r ~~;

ee -

,e.

-

-'

e.

8