Marconi CR150/6 Manuel

DESCRIPTION

OPERATING

INSTRUCTIONS

FOR

COMMUNICATIONS

RECEWER

Type

CR.iyo/6

Coc-

7%’

,TCcr

-r

)

—

OFFTCE

‘H1

—

Technical

Handbook

T.2719/2

Marconi

MARCONI’S

WIRELESS

TELEGRAPH

COMPANY

LIMITED

Chelmsford,

Essex. England

Telephone:

Chelmsford

3221

Telex:

1953

Telegrams:

Expanse

Chelnuford

Telex

12058

Printed

England

and

Published

Marcunis

Wireless

Telegraph

Company

Limited.

Receiver Type CR.

i5016

i.e.’

—

— —

—

INThODUCT1ON

CONTENTS

Page

General

...

.. .

2.2

Electrical

Characteristics

2.2.1

Circuit Details

2.2.2

Selectivity

2.2.3

Sensitivity

2.2.4

Automatic

Gain

2.2.5

Crystal

Control

2.2.6

Desensitising

Metering

2.3

Tuning

2. 3.

Frequency

Selection

Fine

Tuning

Crystal

Cal

ibntor

.2719/1

6974

Sensitivity

Selectivity

Overall

Frequency

Response

Thermal

Stability

Automatic

Gain

Control

Outputs

...

Power

Consumption

3.1

Controls

...

3.1.

Power

Supplies

Switch

1.2

Band

Change

Switch

3.1.3

Tuning

Controls

3.1.4

Sensitivity

Control

1.5

Operational

Switch

3.1.6

Gain

Controls

1.7

Meter

Switch

3.L8

Preset

Controls

3.2

Location

Components

(i)

TECHNICAL

SUMMARY

...

... ...

...

Salient

Features

2.1.

Types

Service

2.1.2

RU’

Input

...

... ...

...

2.1.3

Output

... ...

...

2.1.4

Tropical

Use

...

2.1.5

Power

Supplies

...

... ...

Control

(AGC)

2.4

Performance

2.4.

2.4.2

2.4.3

2.4.4

2.4.

2.4.6

2. 4.

GENERAL

DESCRIPTION

CONTENTS

(Contd.)

Page

3.3

Mechanical

Construction

CIRCUIT

DESCRIPTION

General

Arrangement

...

4.2

Signal

Frequency

Circuits

... ...

...

4.3

Intermediate

Frequency

Circuits

...

... ... ...

4.4

Third

(Beat)

Oscillator

and

Signal

Detector

...

4.5

Audio

Frequency

Circuits

...

.. ..

4.6

Automatic

Gain

Control

Circuits

... ... ... ...

4.7

Noise

Limiter

...

4.8

Crystal

Oscillator

...

4.9

Desensitising

Circuit

... ...

supply

Units

... ...

...

... ... ... ...

...

INSTALLATION

For

Mains Working

... ... ... ... ... ... ...

...

5.2

For

Batteries

from

other

Source

... ...

...

5.3

Aerial

Input

Connections

... ...

...

5.4

Outputs

...

... ...

...

... ... ...

5.5

Desensitising

Facilities

...

.........

5.6

AGC

Terminals

and

Time

Constant

Adjustment

... ...

...

5.7

Diversity

Connections

...

... ... ...

...

OPERATING

INSThUCTIONS

... ...

6.1

General...

...

6.1.

Preliminary

Adjustments

...

1.2

Use

PASSBAND

Switch

...

... ...

...

6.1.3

Use

AGC

...

.. ..

6.1.4

Use

Gain

Controls

...

6.1.5

Use

Calibration

... ...

6.1.6

Use

Meter

Tuning

Indicator

... ... ...

Use

Noise

Limiter

...

6.1.8

Use

Logging

Scale

...

6.1.9

Use

Crystal

Controlled

First

Oscillator

.. ..

Adjustment

Third

Oscillator

...

6.1.11

Warming

...

MAINTENANCE

...

General

...

7.2

Routine

Maintenance

...

Valve

Replacements

7.2.2

Replacing

the

Calibration

Drum

Drive

Cord

... ...

...

7.2.3

Replacing

the

Pointer

Drive

Cord

...

7.3

Circuit

Checks

...

... ...

...

,..

7.4

Voltages

and

Feeds

...

6914

(ii)

CONTENTS

(Contd.)

Page

7.4.

Power

Consumption

7.4.2

Voltages

. .

7.4.3

Valve

Feeds

7. 4. 3.

Metered Feeds

7.4.3.2

Feeds

and

7.4.3.3

Feed

7. 4.

Current

through

7.5

Receiver

Alignment

7. 5.

Test

Equipment

7.5.2

Amplifier

Tests

7.5.2.

Sensitivity

7.5.2.2

Amplifier

Tests

7.5.3

Alignment

465

ftc/s

Amplifier

Circuits

7.5.3.

General

7.5.3.2

Controls

7.5.3.3

Tuning

IFT.4,

IFT.5

and

IFT

(without

Alignment

oscilloscope)

7.5.3.4

Tuning

IFT.

and

IFT

(with

alignment

oscilloscope)

7.5.3.5

Third

Oscillator,

Tuning

and

Output

Voltage

7.5.3.6

Tuning

IFT.2

and

IPT.3

(without alignment

oscilloscope)

7.5.3.7

Tuning

IFT.2

and

IFT.3

(with

alignment

oscilloscope)

7.5.3.8

Capacitance

Trimmers

C47,

C124,

C57

and

C126

7.5.3.9

Retuning

IFtG

(after

using

alignment

oscilloscope)

...

Stabijiser

Tube

V14

...

7.5.4

Second

Oscillator,

Tuning

and

Output

Voltage

...

7.5.5

Selectivity

405

ftc/s

Amplifier

...

7.5.6

Stage

Gains

465

ftc/s

Amplifier

... ...

7.5.7

Variation

Gain

with

Bandwidth

...

7.5.8

1600

ftc/s

Amplifier

....

IF.

Response

...

5. 8.

Retuning

IFT.

...

7.5.8.3

IF.l

Gain

...

... ...

...

7.5.9

Signal

Frequency

Amplifier

... ...

7.5.9.1

First

Oscillator

Alignment

.......

7.5.9.2

Alignment

Signal

Frequency

Circuits

... ...

7.5.

First

Oscillator

Voltages

7.5.

10.1

Variable

Oscillator

...

7.5.10.2

Crystal

Oscillator

...

5. 10.

External

Oscillator

...

... ...

7.6

Overall

Performance

...

. .

...

7.6.

CIV

Sensitivity

...

. .

T.2719/1

7.6.2

sensitivity

for

Modulated

Signals

...

....

6974

7.6.3

AGC

... ...

...

... ...

(iii)

CONTENTS

(Contd.)

Page

7.6.4

Image

Protection

... ...

7.7

Additional

Performance

Data

...

... ...

7.7.

Stage

Gains

Siia1

Frequency

Amplifier

... ...

7.7.2

Selectivity

Amplifier

...

7.7.3

Amplifier

Detune

Ratios

...

... ...

...

7.8

Supply

Unit

... ...

USEYUL

AUXILIARY

EQUIPMENT

... ... ... ...

COMPONENTS

AND

SPARF

Main

Items

...

.....

.. ..

9.2

Accessories

...

... ...

9.3

Components

Lists

...

Receiver

Type

CR15016

No.1

Supply

Units

1325/4

and

1325/5

No.2

LIST

ILLUSTRATIONS

Photographs

Number

Frontispiece

29512

Fig.

MISCELLANEOUS

Block

Diagram

(WZ.

10602/B

Sh.

Fig.

Logging

Scale

(WZ.

10953/C

Sh.

Pig.

Method

Fixing

Aerial

Feeder

Cable

Plug

042.5328/B

Sh.

Fig.

Cord

Drive

Assembly

(I1SK.13976

Sh.1)

Fig.

CIRCUIT

DIAGRAM

AND

COMPONENT LAYOUT

DIAGRAMS

Circuit

Diagram

of Receiver

(WZ.8394/D

Sh.

Fig.

Conponent

Layout

Receiver

(WZ.

8395/D

Sb.

Fig.

Circuit

Diagram

Supply

Unit

(W14768/B

Sh.1)

Fig.

Component

Layout

Supply

Unit

(WI

10728/B

Sb.

Fig.

PERFORMANCE

CURVES

Response

(Y2.

10604/B

Sh.1)

Fig.

Response

(WI

10606/B

Sb.

Fig.

Overall

Frequency

Response

04110607/B

Sh.1)

Fig.

AGC

Characteristic

042.10605/B

Sh.1)

Fig.

Frequency

Drift

(WZ.10603/B

Sh.1)

Fig.

Electric

Shock

Treatment

(WZ.

12308/B

Sb.

19/

(iv)

DESCRIPTION

OPERATING

INSTRUCTIONS

FOR

COMMUNICATIONS

RECEIVER

TYPE

CR.150/6

INTRODUCTION

GENERAL

The

CR150/s

receiver

shobfll

the

Frontispiece

(Fig.i)

modified

version

the

CR15013

and

covers

the

range

Mc/s

four

bands.

The

receiver

double-superheterodyne

enploying

intermediate frequencies

1600

kc/s

and

465

kc/s.

crystal-controlled

first

oscillator

operating

six

spot

frequencies

incorporated

addition

the

varialfle

LC-controlled

oscillator.

Four

pass-bands

and

Icc/s

are

provided.

All

valves

used

the

receiver

are

British

Services

preferred

types.

There

are

three

models

the

CR150/6

receiver;

glition

for

table

mounting

shown

the

Frontispiece

(Fig.I);

Edition

is similar

but

suitable

for

rack

mounting,

and

Edition

which

supplied

without

cover

and

intended

for

mounting

cabinet.

reduce

temperature

changes

the

receiver,

the

power

supply

unit

contained

separate

case

which

may

placed

beside

the

receiver

any

other

convenient

position.

There

are

two

similar

types

Supply

Unit;

the

Type

1325/4

for

table

mounting

and

the

Type

1325/5

for

Rack

Cabinet

mounting.

Electrically,

the

receivers

are

identical

and

are

the

Supply

Units.

The

dimensions

and

weights

of the

receiver

and

supply

unit

are

given

Table

TABLE

unit

Width Depth

Height

Weight

Receiver

Unit

Type

CR150/s

20.

Sin.

17in.

in.

lb.

(52

cm)

(43

cm)

(35,

6cm)

(28kg)

Swply

Units

Type

1325/4

25in.

lSin.

in.

lb.

(13.3

cm)

(38

cm)

(30,5cm)

(11.

3kg)

TECHNICAL

SUMMARY

SaIENT

FEATURES

2.1.

Types

Service

The

receiver

designed

for

the

reception

LW,

MCW

telephony

transmissions

and

covers

the

range

Me/s

Mo/s

(150

9.4

metres)

four

bands.

desired,

diversity

reception

may

employed

using

two

receivers.

For

this

purpose,

T.271911

connections

are provided

the

receiver

for

external

common

oscillator

and

for

69’74

conron

automatic gain

control

circuit.

2.1.2

Input

The

aerial

may

connected

directly

the

receiver

via

75-

100

ohm

balanced

unbalanced

feeder.

2.1.3

Output

connections

for

ohm

loudspeaker,

high

low

resistance

phones

and

600

ohm

line

are

provided.

2.1.4

Tropical

Use

The

receiver

suitable

for

continuous

operation

under

tropical

conditions.

2.1.5

Power

Supplies

The

receiver

supply

unit

Type

1325/4

1325/5

will

operate

from

single-phase

50-60

c/s

source

200

250

volts,

the

receiver

alone

may

operated

from

batteries.

2.2

ELECTRICAL

CHARACTERISTICS

2.2.1

Circuit Details

The

receiver

employs

double

superheterodyne

circuit

with

first

IFof

1600

kc/s

and

second

465

kc/s.

Two

signal

frequency

amplifiers

and

amplifier

the

first

are

followed

three

amplifiers

the

second

incorporating

the

main

selective

circuits.

The

detector

followed

noise

limiter

and

two

stages

audio-frequency

amplification.

block

diagram

given

Fig.

2.2.2

Selectivity

High

discrimination

against

adjacent

channel

interference

obtained

the

use

band-pass

crystal

filters

465

1cc/s.

Four

pass-bands

and

kc/s

are

provided

that

the

selectivity

may

adjusted

suit

the

conditions

service.

High

discrimination

against

image

response

obtained

using

relatively

high

first

intermediate

frequency

(1600

kc/s).

2.2.3

Sensitivity

The

sensitivity

good

all

ranges

and

limited

only

the noise

level

inherent

the

first

stage.

2.2.4

Automatic

Gain

Control

(AGC)

The

automatic

gain

control

circuits

enable

wide

fluctuations

signal

strength

tolerated;

alternative

time

constants

are

provided

suit

the

type

signal

being

received.

2.2.5

Crystal

Control

2719/r

The

first

oscillator

may

crystal-controlled

any

six

spot

frequencies.

6974

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