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OPERATING

INSTRUCTIONS

C828M

2m

FM

lOW

We

are

happy

you

have

chosen

our

new

product

STANDARD

C828M,

the

füll

solid

State

FM

transceiver

for

the

amateur

radio

in

2m

band.

The

Model

C828M

has

been

developed

by

your

STANDARD

COMMUNICATIONS

CORP

with

unsparing

applications

of

its

tradltionally

held

ultraminiaturization

tech-

niques

and

with

its

personal

considerations

given

from

the

Standpoint

of

the

users.

It

is

carefully

designed

in

every

respect

and

manufactured

at

STANDARD's

modern

factory.

We

are

sure

that

a

number

of

features

and

excellent

reliability

will

pro-

vide

you

with

great

satisfaction.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

TABLE

OF

CONTENS

Features

of

C828M

2

Cautions

Prior

to

Use

6

Installation

Procedures

8

Communication

Procedures

9

Repeater

Offset

Oscillator

10

"Busy"

Indicator

Lamp

10

Meter

11

Stand

11

Adjustment

of

Microphone

Sensitivity

12

Microphone

Connector

12

Accessory

Terminal

13

Channel

Increase

14

Accessory

Parts

15

Connection

of

External

Speaker

15

Antenna

and

Coaxial

Gable

16

Noise

Prevention

Measures

for

Use

as

Mobile

Station

17

C828M

Specification

18

Block

Diagram

19

Circuit

Diagram

20

—

1

—

1.

Features

of

C828M

We

know

that

lighter

and

smaller

high-performance

equipment

creates

new

appli-

cation,

and

this

is

quite

true

of

C828M.

Such

features

and

many

others

of

this

Model

as

mentioned

below

will

enable

all

of

you-from

beginners

to

veterans-to

enjoy

a

broader

scope

of

the

usages.

1.

small

Size

and

Light

Weight:

This

new

FM

transceiver,

smaller

in

volume

than

a

half

size

of

the

comparable

products

of

this

Company

and

as

light

as

0.96

kg,

has

succeeded

in

hnding

its

Installation

space

for

mobile

Station

use

at

vehicle

driver's

seat

area

instead

of

assistant

driver's

which

has

been

exclusively

used

for

this

purpose

in

the

past,

ushered

in

the

debut

of

a

new

type

mounting

metal

bracket.

2.

Push-In/Push-Out

Bracket:

This

metal

bracket

has

simplified

the

attaching

and

detaching

processes

of

C828M

on

a

Single

motion

basis.

For

attaching,

just

snap

your

transceiver

into

the

bracket.

The

reve/'se

consequence

can

be

obtained

by

simply

snapping

it

off

toward

you.

The

bracket

with

the

transceiver

off

therefrom

is

an

evenly

faced

metal,

which

therefore

prevents

rattling

causable

during

the

vehicle

Operation

and

also

protects

your

feet

against

a

possible

hazard

from

a

sharp

projection.

Such

attaching

and

detaching

processes

do

not

require

you

to

put

in

your

hands

on

the

sides

of

the

rig.

Thus,

the

attaching

process

brings

the

sides

of

the

rig

into

a

dose

contact

with

their

corresponding

parts.

The

rig's

occupancy

of

small

space

serves

for

the

efficient

employment

of

the

limited

interior

room

of

the

car.

^

'

3.

Single

Crystal

System

Common

to

Transmission

and

Reception:

The

adoption

of

the

Single

crystal

system,

in

which

one

crystal

is

used

for

both

transmission

and

reception

of

Signals,

has

opened

the

way

to

an

economical

In

stallation

of

additional

Channels

and

the

very

expedient

experiment

or

Operation

in

Joint

use

of

multifarious

external

oscillators.

4.

One

Action

Repeater

Changeover

System:

The

transceiver

has

3

built-in

offset

oscillators

including

SIMPLEX.

This

fea-

ture

together

with

the

füll

advantages

of

the

single

crystal

system

permits

change

over

to

the

repeater

Channel

with

a

fi

nger

action

of

switch

on

the

front

panel.

5.

Call

switch

for

Tone

Burst

Signal

Transmission:

C828M

incorporates

tone

burst

device

(CTN-5).

By

pressing

the

call

switcb

(momentary

switch)

for

Operation

of

repeater

Channel,

a

high

power

tone

burst

Signal

is

transmitted,

thus

assuring

stabilized

Operation

of

repeater.

6.

Hi-Low

Power

Changeover:

By

setting

the

function

switch

on

the

front

panel

from

"

high

"

to

"

low

"

power

Position,

the

antenna

Output

is

reduced

from

lOW

to

IW

with

resultant

decrease

of

power

consumption.

This

prevents

radio

interference

and

other

disturbances

during

local

QSO,

providing

smooth

and

efficient

Operation.

7.

Remote

Control

System

for

External

Oscillator

Changeover:

Connection

of

external

oscillator

to

the

transceiver

can

be

made

simply

by

flipp-

ing

the

evternal

oscillator

switch

on

the

microphone.

8.

Professional-minded

Circuit

Design:

FET's,

Silicon

transistors

and

diodes

are

abundantly

used

in

the

circuitry

de-

—

9

signed

with

Professional

minded

techniques

and

latest

technicl

knowhow.

(a)

Receiver

(1)

High

Sensitivity

High

sensitivity

design

as

represented

by

the

~3dB

QS

20dB

and

the

over

23dB

S/N

at

OdB

input.

(2)

Excellent

Cross-Modulation

Characteristics

The

e3

cellent

cross-modulation

characteristics

are

due

to

the

use

of

FET's

for

the

radio

frequency

ampliher

and

the

fi

rst

and

second

mixers,

also

due

to

the

removal

of

the

fi

rst

intermediate

frequency

(IF)

amplifier

and

the

gains

distribution

made

with

our

new

technical

approach.

(3)

Ceramic

Filter

The

two

ceramic

fi

lters

in

the

second

IF

amplifying

stage

play

a

role

for

the

alleviation

of

ripples

within

pass

band

for

better

selectivity

characteri

stics.

_

(4)

Integrated

Circuits

The

second

IF

amplifying

stage

consists

of

3-stage

amplifying

unit

plus

the

integrated

circuitry,

thus

showing

very

good

limiter

effect.

(5)

Squelch

Circuit

The

squelch

circuit

is

a

noise

rectifier

type

enjoying

an

established

reputa-

tion

for

mobile

Station

use,

and

the

circuit

operates

securely,

thanks

to

the

high

gains

resulting

from

the

2-stage

noise

amplification.

(6)

Squelch

Time

Constant

With

the

squelch

unit

(accessory)

connected

to

the

accessory

terminal

on

the

rear

panel,

the

squelch

time

constant

can

be

changed

to

the

best

suitable

value

for

respective

uses

as

mobile

and

fi

xed

stations.

(7)

3W

of

Audio

Output

The

maximum

audio

Output

is

as

high

as

3W,

permitting

the

Operation

of

your

transceiver

at

Optimum

sound

level

even

in

a

noisy

expressway.

(8)

"Busy"

Indicator

Lamp

The

green

lamp

turns

off

and

on

in

association

with

the

squelch

circuit,

regardless

of

the

Position

of

the

volume

control

knob,

to

clearly

indicate

which

rig

is

receiving

the

signal.

This

lamp

is

convenient

in

a

parallel

Oper

ation

at

50MHz,

430MHz

and

other

bands.

(9)

Highly

Sensitive

Incoming

Signal

Meter

This

incoming

signal

meter,

containing

a

meter

amplifier

designed

to

swing

the

pointer

in

response

even

to

weak

incoming

signal,

can

show

the

exact

change

in

the

input

voltage

of

the

antenna.

(b)

Transmitter

(1)

High-gain,

High-efficiency

Transistors

Newly

developed

high-gain,

high-efficiency

transistors

are

used.

The

fi

nal

stage

is

equipped

with

2N6082

providing

sufficient

margin

to

the

Operation.

(2)

Offset

Mixer

Provided

with

FET

The

MOS

FET

incorporated

in

the

offset

mixer

of

the

signal

transmitting

section

reduces

the

occurrence

of

spurious

radiation.

(3)

Direct

FM

Modulation

System

The

22.

OMHz

frequency

from

the

offset

oscillator

undergoes

direct

FM

modulation.

This

eliminates

the

difference

of

modulation

degree

between

—

3

-

Channels.

(4)

Twisted

Wire

Twisted

wire

is

used

for

stable

impedance

conversion

and

wide

bandwidth

characteristics.

(5)

Splatter

Filter

The

RC

network

filter

and

the

transistor

operated

splatter

filter

provide

high

clarity

and

high

average

level

of

modulation,

and

cause

no

interference

with

other

Channels

through

expansion

of

the

band

occupancy.

(6)

Microphone

Gain

Control

A

semi-fixed

resistor

for

microphone

gain

control

is

mounted

on

the

main

printed

wiring

boad

for

transmitter.

(7)

Transmitter

Indicator

Lamp

and

Meter

When

the

push

button

on

the

microphone

is

pressed,

the

red

pilot

lamp

illuminates

to

show

that

the

transmitter

is

in

transmitting

mode.

Düring

the

transmission,

the

meter

indicates

the

relative

value

of

the

transmitting

Output.

(8)

Channel

Selector

With

Short-circuiting

Ring

The

Channel

selector

of

C828M

is

provided

with

a

short-circuiting

ring

to

prevent

possible

interference

caused

when

additional

Channels

are

installed

or

when

the

frequencies

of

neighboring

Channels

are

adjusted,

thereby

help-

ing

make

the

frequency

alignment

much

easier

during

the

installation

of

ad

ditional

Channels.

The

trimmer

capacitor

for

delicate

alignment

for

both

the

transmitter

and

receiver

performs

accurate

adjustment

of

all

the

Channel

fre

quencies.

(9)

Uncasing

Possible

with

No

Holp

of

Tools

Uncasing

is

possible

with

the

two

screws

in

the

rear

removed

by

the

fi

n-

gertip

Operation.

This

feature

lends

itself

to

the

addition

of

the

Channel

and

other

purposes.

(10)

Anodized

Alminum

Chassis

Anodized

alminum

is

used

for

both

the

case

and

chassis.

The

main

chassis

is

2mm

thick

for

an

adequate

mechanical

strengt

and

designed

to

show

good

heat

sink

effect.

(11)

Antenna

Connector

The

M-shaped

antenna

connector

screws

have

their

pitches

available

com-

monly

in

both

inch

and

millimeter.

(12)

Microphone

Connector

with

Speaker

Terminal

A

4-pin

connector

is

used

for

microphone

connection.

Since

audio

Output

is

connected

to

No.

4

pin,

this

connector

permits

connection

of

telephone

handset

as

well

as

the

microphone.

(13)

Accessory

Terminal

(A.T.)

A

9-pin

accessory

terminal

is

provided

on

the

rear

for

connections

of

ac

cessory

units

from

outside.

(14)

Wide

Range

of

Operating

Temperature

The

operating

temperature

ranges

from

—30°C

to

-)-60°C.

This

is

good

enough

for

mobile

Operation

even

in

severely

cold

environments.

(15)

Microphone

with

Switches

The

microphone

is

equipped

with

external

oscillator

switch

and

P.T.T.

Switch

(microswitch).

Sharp

switching

from

transmission

mode

to

reception

_

4

—

mode

or

vice

verse

is

assured.

(lE^

Detachable

Stand

The

detachable

stand

furnished

facilitates

the

use

of

C828M

as

a

fixed

Station.

(17)

Power

Supply

Protective

Circuit

The

power

supply

circuit

is

provided

with

a

protective

function

so

as

to

keep

the

internal

circuit

from

any

possible

damage

caused

in

wrcng

connec-

tion

of

the

power

supply.

(18)

Ant,

Protector

Antenna

protector

circuit

Starts

to

work

on,

when

antenna

becomes

to

open

or

Short

circuit,

or

degradation

of

SV/R.

Transmitting

LED

goes

to

dark

when

there

is

no

more

RF

output.

Ii

r^ic

occasion

try

to

fi

nd

out

abnormal

point

on

the

antenna

circuit

and

reset

•

radio

to

a

normal

condition

of

the

transmission.

Accordingly

the

antenna

Protector

Circuit

is

automatically

re-

leased

to

its

normal

condition.

—

5

—

2.

Cautions

Prior

to

Use

The

following

precautions

must

be

observed

for

the

maximum

Performance

of

your

C828M

and

for

your

enjoyment

of

better

ham

life:

1.

DO

NOT

Connect

or

disconnect

the

power

supply

cord

when

the

power

supply

Switch

is

in

ON

position.

2.

DO

NOT

connect

or

disconnect

the

antenna

or

external

Speaker

when

the

power

supply

switch

is

in

ON

position.

3.

DO

NOT

push

the

microphone

switch

with

the

antenna

left

disconnected.

4.

BE

SURE

to

replace

the

blown-off

fuse

withe

a

new

one

rated

at

3A.

5.

CHECK

to

see

the

polarity

of

the

electrical

system

prior

to

the

power

supply

connection.

C828M

is

designed

for

negative

grounding;

the

black

lead

should

be

connected

to

the

ground.

Od)

(D®

(b

d

Figure

2—1

—

6

—

Figure

2—1

Transmission

Indicator

Repeater

Indicator

Lamp

Mounting

Metal

Brackel

Auxiliary

Mounting

Metal

Brackel

Volume

Control

Knob

Power

Switch

®

Squelch

Control

Knob

Channel

Selector

EXT-OSC

Switch

Antenna

Connector

F.T.T.

Switch

External

Speaker

Terminal

Busy

"

Indicator

Lamp

3.

Installation

Procedures

Prior

to

Installation,

determine

the

instaliation

position

observing

the

following

Points:

*

I

fhere

any

unusual

posture

required

in

the

Operation

of

the

Channel

Selector

and

other

control

knobs?

*

Are

all

the

control

knobs

and

meter

scale

face

located

in

piain

view

?

*

Isn't

the

instaliation

position

of

the

rig

for

use

as

a

mobile

Station

impeding

the

general

motions

of

the

vehicle

driver

or

the

Operator

of

C828M?

*

Specifically

for

use

as

a

mobile

Station,

make

sure

not

to

place

the

transceiver

anywhere

near

a

heater

duct,

air

conditioner's

exhaust

mouth,

air

intake

mouth

and

the

like.

*

Refrain

from

mounting

the

transceiver

on

such

places

as

exposed

to

rainfall

and

sea

water.

Although

there

is

no

restriction

as

to

the

Installation

posture

of

C828M,

it

is

recommended

that

the

body

of

the

transceiver

be

set

upright

for

use

in

yachts,

commercial

vehicleshetc.

After

the

instaliation

position

is

determined,

install

the

transceiver

according

to

the

following

procedures:

1.

Take

out

the

furnished

mounting

metal

bracket

(17)

and

attach

it

to

the

body

of

the

transceiver.

2.

Position

the

mounting

bracket

in

predetermined

instaliation

place,

make

a

bore

for

the

bracket

with

a

5—5.5mm

drill,

and

secure

it

with

the

supplied

screws

and

nuts,

preferably

at

three

or

more

places.

Use

wooden

or

tapping

screws

according

to

the

mounting

plane.

3.

Set

the

body

of

the

transceiver

again

on

the

mounting

bracket.

4.

Connect

the

power

supply.

At

this

time,

again

make

sure

of

the

polarity

of

the

electrical

system.

5.

Firmly

secure

the

antenna

to

the

antenna

connector

(13).

Refer

to

Fig.

2-1.

6.

Connect

the

microphone

to

the

microphone

connector

(3)

on

the

front

of

the

transceiver,

and

fix

the

supplied

microphone

hanger

on

a

convenient

place

for

lifting

(see

Fig.

2-1).

The

above

completes

the

instaliation,

and

you

are

now

ready

to

start

commimi-

cation.

~

8

—

4.

Commuiiication

Procedures

^

1.

Preparation

for

Communication

First,

turn

the

SQL

knob

(2)

fully

counterclockwise,

and

then

set

the

Channel

selector

(11)

to

the

Channel

you

desireto

use.

2.

Turn

on

the

power

supply

switch.

Turn

the

VOL

OFF

knob

(1)

clockwise

until

it

clicks.

The

Channel

selector

lamp

and

the

meter

lamp

will

light

up

to

show

that

the

power

is

on.

3.

Adjust

the

volume.

As

you

turn

the

VOL

OFF

knob

(1)

clockwise,

you

will

come

to

a

point

where

a

rustling

noise-or

the

conversation

in

the

case

someone

is

talking

over

the

chan-

nel-becomes

audible.

Set

the

knob

for

suitable

volume

while

listening

to

the

noise

or

the

conversation.

4.

Set

the

squelch

control.

Turn

the

Channel

selector

and

set

the

SQL

knob

(2)

using

an

empty

Channel,

Turn

the

knob

slowly

in

the

clockwise

direction

until

you

come

to

a

point

where

the

noise

suddenly

goes

off.

Set

the

SQL

knob

on

this

point

and

you

will

hear

no

noise

but

the

incoming

Signal

alone

through

the

Speaker.

In

this

case,

if

the

signal

is

unclear

because

of

the

squelch

circuit

being

off

and

on

due

to

the

signal

condition

of

your

party's

Station,

turn

the

SQL

knob

slightly

further

to

the

right.

5.

Transmission:

Set

the

repeater

switch

and

hi-low

power

switch

to

the

desired

positions.

Take

up

the

microphone

and

press

the

push

button

on

the

microphone.

Speak

into

the

microphone

slowly

and

distinctly

in

normal

tone

of

voice.

At

this

time,

the

red

lamp

in

the

front

illuminates

to

show

the

transmitting

Status

as

long

as

the

push

button

remains

pressed.

Simultaneously,

the

meter

indicates

the

com-

parative

value

of

the

transmission

power.

Now,

your

voice

is

out

on

the

air.

-

9

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