ROH 120 User manual

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Distribution Amplifier

Model 120

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The

Model

1

20,

distribution

amplifier, offers high performanceand estab-

1

ished

reliability

for

demanding

applications in commercial

communica-

tion service. Dual and four channel units are available in totally self-

contained 19 inch rack

mount

packagin

g.

These units incorporate the

lat

es

t developments in solid sta

te

technology,

combined

with

premium

co

mponents and rigorous construction detail. Internal assembly

is

modu-

lar and

may

be

se

rviced by the exchange

of

plug-in assemblies.

Each

channel includes a separate regulated

power

supply to enhance system

reliab

ility

and

minimize

channel crosstalk. Both test jacks and the gain

adjustments are provided on the front panel. The test jacks

ca

n

be

switched to either the

input

or

output

circuitry

for external test and level

m

eas

urement. An optional

VU

meter

is

available for

monitoring

the

input/output

levels

of

each channel. The meter sensitivity

is

switch

selected between

-20

and +

20

dB in 10 dB steps. The 0 dB calibration

can be adjusted

over

a 10 dB range to

include

the 0,

+4,

or

+8

dBm

standard references.

Meter

response balistics may be selected for stan-

dard

VU

characteristics

or

a peak respo

nding

indication,

which

will

indicate signal peaks

qui

ckly

without

overshoot

or

averaging. Termina-

tion

of

the

equipment

is

made to nonbreakable plastic barrier blocks.

Termina

ls

are

sc

rew compressed

wire

clamps

which

make a

sec

ure

connection

without

requiring

wire

lugging

or

wrapping. Power require-

ments are compatable

with

11

5/

230

Vac,

50

or

60

Hz

line sources.

1111

11111111

roH corPoraT1on

II

11111111

II

101

TecHnOLOGY ParK1aTLanTa

norcross.

Ga

30011

(404)

449-0873

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Specifications

Gain:

Input:

Outputs:

Output

Level:

Output

Isolation:

Frequency Response:

Distortion,

THD

or

IM:

Noise:

Meter Range:

Meter Calibration:

Meter

Accuracy:

Meter Response:

Meter

Balistics:

Ambient

Temperature:

Power Requirement:

Size:

Weight

:

0

to

+

30 dB, potentiometer adjustment

10 K ohms balanced bridging

60 dB CMR

at

60

Hz

+

20

dBm

maximum

common

mode

input

Eight 600

ohm

source terminated differential outputs

±1% balance

to

equipment

common

+20

dBm

70 dB at 10

kHz

20

Hz

to 20

kHz

±.5 dB at rated

output

-

50

dB, %%

maximum

at rated

output

85 dB SIN ratio,

-65

dBm

residual

-20

to

+

20 dB in 10 dB steps

0,

+4

or

+8

dBm

for OdB

indication

±

3%

of

reading and ±

2%

of

range

20

Hz

to

20

kHz

±.5

dB

Standard

VU

or

Peak

Responding

0° to

+

50° C operating range

11

5/230 Vac, ±10%, 50 to 60 Hz, 50 watts

3.5

11

H

x

19

11

W X

13

11

D

1

o

lbs.

Model Number and Name

Model

122

Model

124

Options

01

Dual 1

x

8

Distribution

Amplifier

Quad

1

x

8

Distribution

Amplifier

Add

Input/Output

Metering

•

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MODEL

120

DISTRIBUTION

AMPLIFIER

OPERATORS

INSTRUCTIONS

Your

ROH

120

Series

distribution

amplifier

was

carefully

inspec

ted,

both

elec-

trically

and

mechanically before shipment.

It

should

be

physically

free

from

mars

or

scratches,

and

in

perfect

electrical

order

upon

receipt.

The

unit

should

be

carefully

inspected

for

damage

in

transit

and

if

any

damage

is

noted,

ROH

Corporation should

be

contacted immediately. This

unit

is

designed to

mount

in

an

EIA

standard,

19

inch width rack.

The

120

Series

amplifiers

may

be

powered

from

either

115

or

230

V

ac,

50

or

60

Hertz. Before connecting the

120

to

an

ac

power

source,

verify

that

the

voltage

selector

switch

on

the

rear

panel matches

that

being used. A

pilot

lamp

on

the

front

panel

will

glow

when

power

is

applied

to

the

unit.

Input

and

output

connections

are

made

on

the

rear

panel terminal blocks.

There

is

a

separate

terminal block

for

each channel,

and

the individual

ter-

minals

are

clearly

labeled.

Separate gain adjustment

for

each channel

is

pro-

vided

by

potentiometers

located

on

the

front

panel. These

may

be

adjusted

after

removing the screw-on cap.

The

front

panel

test

jacks

for

each channel

may

be

switched

to

either

the

input

or

output

circuitry

for

external

test

or level

measurements . This

is

accomplished

by

pulling

out

the switch,

and

then

moving

it

to

either

the

input

or output

position.

A

phone

jack

is

also

provided for

listening

to the

input/output

signal

selected

by

the switches. A

detailed

schematic

and

parts

list

for

the

distribution

amplifier

is

attached.

If

the meter option

is

ordered,

the

front

panel switches

also

sele

ct

which

input or

output

is

to

be

measured

by

the meter

circuit.

The

meter range

and

response

are

selected

with

interlocking

pushbutton switches.

When

the

INPUT

/

OUTPUT

switch

is

in

its

center

position,

the

test

jacks provide

an

external

input to the meter

circuit.

If

the meter option

is

ordered, see the

attached

pages

for

more

detailed

information

on

the meter

circuit.

Unless otherwise

requested, the meter

circuit

is

factory

calibrated

to

read O

VU

for a O

dBm

level .

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MODEL

120

1120

DISTRIBUTION

AMPL

I

FIER

MODULE

PARTS

LIST

Item

Description

Part

Number

or

Type

Manufacturer

Cl,4 3.3 uf/35 V

tant

T392C335K035AS

K

emet

C2,5

0.03 uf/100 V cera

TG-S30

Sprague

C3,6

560

uf/30 V

elec

TCG

561U030GlL3P

Mallory

C7

,8,

10

0.001 uf/250 V cera

2SSD10

Sprague

C9

l uf/50 V cera

CZ5Ul05

Sprague

Cll,12

33

uf/16 V

tant

T392D336K016AS

Kemet

Dl-4 l

A/50

V

Si

1N4002

Motorola

Fl,2 1/2

A/250

V

MDL

Bussman

L

l,

2

1000

uH

10

%

50

mA

RFC-S-1000

Nytronics

Rl-4,

14-21

4.99 k

ohms

1/4 W1%

RN55D

Allen Bradley

RS,6,7 20.0 k

ohms

1/4 W1%

RN55D

Allen Bradley

R8

1 k

ohms

1/2 W

10

%

3389P

Bourns

R9

20.5 k

ohms

1/4 W1%

RN55D

Allen Bradley

RlO

100

k

ohms

1/4 W5%

RCR07

Allen Bradley

Rll

1 k

ohms

1/4 W5%

RCR07

A

11

en

Bradley

Rl2,30-45 10.0 k

ohms

1/4 W1%

RN55D

Allen Bradley

Rl3

5.

1 k

ohms

1/4 W5%

RCR07

Allen Bradley

R22-29

10

k

ohms

1/4 W1%

RN55D

Allen Bradley -

R46-61

301

ohms

1/4 W1%

RN55D

Allen Bradley

Ul

-18 V Regulator

MC7918

CP

Motorola

U2

+18

V Regulator

MC7818

CP

Motorola

CHASSIS

PARTS

LIST

Item Description

Part

Number

or

Type

Manufacturer

1

LED

FLV

540

Fairchild

2 Input/Output Switch

Type

7203

C &K

3 Potentiometer

CM

40333

Claros

tat

4 Test Point (Black) l05-0803-001 E.F. Johnson

5 Test Point (Green) 105-0804-001 E.F. Johnson

6 Test Point

(Red)

105-0802-001

E.

F.

Johnson

7 1.5 A

Circuit

Breaker

815175

Li

ttl

efuse

8 Voltage Switch

46256LFR

Switchcraft

9

AC

Line

Cord

Receptacle

EAC-203

Switchcraft

10

Transformer

354

T

riad

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MODEL

120

PARTS

LIST

www.SteamPoweredRadio.Com

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www.SteamPoweredRadio.Com

METER

ASSEMBLY

www.SteamPoweredRadio.Com

1001

METER

ASSEMBLY

TECHNICAL

DESCRIPTION

The

m

eter

ass

emb

ly includes the

amplifier

c

ircuitry,

the meter

mo

vement, the

met

er

lamps

and

the ganged pushbutton panel switch.

The

amplifier

provides

up

to four

balanced bridging inputs

which

are

isolated

and

produce nominal

line

loading. T

he

number

of inputs used depends

on

the r

eq

uirements of the instrument with

which

the

meter

is

asso

ci

ated.

The

inputs

are

isolated

by

the

summing

amplifiers

UlA,B

wh

ich

combine

each

side

of the input

line.

The

differential

amplifier

UlD

converts the

balanced inputs to

an

unbalanced output to

drive

the range switch

and

remaining

circuitry.

Resistors

R16-20

in conjunction with the pushbutton range switch

for

m a

step

attenuator

prior

to the

circuit

voltage

amplifier

section

comprised of

UlC

and

U2A.

The

overall

voltage gain

is

adjusted

by

the

calibration

potentiometer

R23

which

provides a

10

dB

variation

in

circuit

sensitivity.

IC

amplifiers

U2D,C

driv

e

separate

full

wave

rectifier

circuits

for

the

RMS

and

peak

response

functions.

The

meter

movement

is

switched between the

two

circuits

depending

on

the

desired

response.

An

additional

amplifier

U2B

is

employed

to

accelerate

the meter point

er

travel

in the peak response

mode.

Capacitor

C6

and

resistor

R38

and

the meter

coil

are

enclosed in the feedback loop

of

U2B

which helps overcome the response delay

caused

by

the mechanical

inertia

of

the meter

movement.

PARTS

LIST

Item Description

Part

Number

or

Type

Manufactur

er

Cl,2 0. 1

uF

16

V cera

HY-450

Sprague

C3

0.001

uF

250

V cera 2SS-Dl0 Sprague

C4

l.

5

uF

50

V

7CZ5Ul5508

Sprague

C5

33

uF

16

V

tant

T392D336K016AS

Kemet

C6

330

uF

6.3 V

T392F337K006AS

Kemet

01-4

100

mA

50

V

Ge

lN270

ITT

-

Il ,2

55

V 0.05 A

1835

Chicago Miniature

M Meter 13-1001

ROH

Rl-8,17 30. 1 k

ohms

1/4 W1%

RN55D

Allen Bradley

R9-

l4

10

k

ohms

1/4 W1%

RN55D

Allen Bradley

Rl5

100

ohms

1/4 W5%

RCR07

Allen Bradley

Rl6

100

k

ohms

1/4 W1%

RN55D

Allen Bradley

Rl8

9090

ohms

1/4 W1%

RN550

Allen Bradley

Rl9

2150

ohms

1/4 W1%

RN550

Allen Bradley

R20,21,26

1000

ohms

l/4

W1%

RN550

Allen Bradley

R22,27

11

k

ohms

1/4 W1%

RN550

Allen Bradl

ey

R23,32

10

k

ohms

1/2 W

10

% 3389-103

Bourns

R24

2.4 k

ohms

1/4 W5%

RCR07

Allen Bradley

R25

51

k

ohms

1/4 W5%

RCR07

Allen Bradley

R28

5.

1 k

ohms

1/4 W5%

RCR07

Allen Bradley

R29,30

24

k

ohms

1/4 W5%

RCR07

Allen Bradley

R31,33

7.5

k

ohms

1/4 W5%

RCR07

Allen Bradl

ey

R34,35

10

k

ohms

1/4 W5%

RCR07

Allen Bradley

R36

1 k

ohms

1/4 W5%

RCR07

Allen Bradley

R37

1 k

ohms

l/2

W

10

% 3389-102

Bourns

R38

200

ohms

1/4 W1%

RN55D

Allen Bradley

Sl

4PDT

7

position

switch

PB15

CRL

•

Ul, 2

Integrated

Circuit

TL075CN

or

RC4136N

Texas

Instru

me

r

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METER

ASSEMBLY

R9

Rl3

19

15 18

0 0

Rl5

RMS

0 u

20

16

17

RIO

S6

C4

C3

R20

22

R27

13

R21

R24

R26

14

::

<¥

17

18

19

R3B

R30

(6

D3

J

Cl

-15V

C2

+15V

FIGURE

5.1.1

ROH 120 User manual

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