GE MASTR II User Manual

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•

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DESCRIPTION

Transmitter

Types

KT-56-A,

C,

KT-57-A,

C &

KT-58-A,

C

are

crystal-controlled,

phase

modulated

transmitters

designed

for

one-

through

four-frequency

operation

in

the

25

to

50

megahertz

band.

The

solid

state

transmitter

utilizes

both

integrated

cir-

cuits

(ICs)

and

discrete

components,

and

consists

of

the

following

assemblies:

•

•

Exciter

Board;

with

audio,

modulator,

amplifier

and

multiplier

stages.

Power

Amplifier

Assembly;

with

ampli-

fier,

driver,

PA,

power

control,

filter

and

antenna

switch.

CIRCUIT

ANALYSIS

EXCITER

The

exciter

uses

nine

transistors

and

two

integrated

circuits

to

drive

the

PA

as-

sembly.

The

exciter

can

be

equipped

with

up

to

four

Integrated

Circuit

Oscillator

Mod-

ules

(ICOMs).

The

!COM

crystal

frequency

ranges

from

approximately

8,33

to

16.67

meg-

ahertz,

and

the

crystal

frequency

is

multi-

plied

three

times

(divided

by

four

and

multiplied

by

12

for

a

multiplication

of

three).

EXCITER

I

MOD

~ADJUST

I

r

-1

~

H

MOD

I

AUDIO

PHASE

AMPL-1

r------1

LIMITER

MOD

0102

CRI02

Ul02

CVIOI

CRI03

I

I

__

_j

~

FREO

MULT-I

Fl

t---r1

BUFF~R

~

DIVIDER

BUFFER

r----

TRIPLER

YIOI

0101

(+4)

0105

0106

I

UIOI

I

I

I

---

---

LBI-4732

__

Audio,

supply

voltages

and

control

functions

are

connected

through

P902

.

Centralized

metering

jack

Jl03

is

pro-

vided

for

use

with

GE

Test

Set

Model

4EX3All

or

Test

Kit

4EX3Kl2.

The

test

set

meters

the

modulator,

multiplier

and

amplifier

stages.

ICOMS

Three

different

types

of

ICOMs

are

available

for

use

in

the

exciter.

Ea~h

of

the

ICOMs

contains

a

crystal-controlled

Colpitts

oscillator,

and

two

of

the

ICOMs

contain

compensator

ICs.

The

different

ICOMs

are:

•

5C-ICOM -

contains

an

oscillator

and

a

5

part-per-million

(±0.0005%)

compensa-

tor

IC.

Provides

compensation

for

EC-ICOMs.

•

EC-ICOM -

contains

an

oscillator

only.

Requires

external

compensation

from

a

5C-ICOM.

• 2C-ICOM -

contains

an

oscillator

and

a 2

PPM

(±0.0002%)

compensator

IC.

Will

not

provide

compensation

for

an

EC-ICOM.

The

ICOMs

are

enclosed

in

an

RF

shield-

ed

can

with

the

type

!COM

(5C-ICOM,

EC-ICOM

or

2C-ICOM)

printed

on

the

top

of

the

can.

Access

to

the

oscillator

trimmer

is

obtained

l

MOD

PHASE

f-----.1

AMPL-2

f-----.1

MOD

0103

CVI02

CVI03

MULT-2

MULT-3

f----

DOUBLER

--

DOUBLER

0107

OIOB

---

---

1----i

r----

MOO

AMPL-3

0104

AMPL-1

0109

I

I

I

HLIMITER

CRI05

CRI()6

I

I

---

---

~--

-~

I

I

F2

•

-1

I

POWER

POWER

AMP

~

I

I

Yl02

I

ADJUST

0204-0210

~-

:

I

I

I

I

~---.

I

PA

I

Fe

1-_j

AMPL-1

t-----

DRIVER

I--

FINAL

f----

I YIOB

0201

0202

0203

~--.J

Figure

1 -

Transmitter

Block

Diagram

LOW

ANT

PASS

I--

SWITCH

FILTER K201

RC-265B

I

I

I

_j

1

Questions and Answers:

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GE MASTR II Specifications

General

Brand	GE
Model	MASTR II
Category	Two-Way Radio
Language	English

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