Kenwood TR-7625 User manual

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Saree

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INTRODUCTION/CONTENTS

INTRODUCTION

Your

KENWOOD

Model

TR-7625

advanced

2-meter

transceiver

for

amateur

mobile,

and

optional

fixed

station

operation.

The

TR-7625

features:

Memory

channel

(simplex

and

repeater

mode).

Memory

and

+600

kHz

repeater

for

repeater

operation.

800

channe}!

PLL

circuit.

Digital

frequency

display.

Dual

concentric

frequency

selector

switches.

PLL

UNLOCK

and

AIR

indicators.

Subaudible

ON/OFF

switch

(Encoder

user

installed).

Powered

tone

pad

connector

with

one

pin.

Mic

connector

with

one

pin.

HI-LOW

(Power)

switch.

Having

25W

output

power.

CONTENTS

GENERAL/CIRCUIT

DESCRIPTION

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Control

Unit

(X54-1440-10),

Indicator,

Switch

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PARTS

LIST

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Unit

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BACK

COVER

TR-7625

GENERAL/CIRCUIT

DESCRIPTION

GENERAL

The

TR-7625

25W.

multi-channel

(800

channels)

transceiver

covering

144~

147.995

MHz.

features

built-in

repeater

shift

circuit

and

memory

circuit,

and

provision

for

connection

optional

(micro-processor)

remote

control.

PLL

CIRCUIT

BLOCK

DIAGRAM

OUTPUT

vcT

TOGOP,

28C460

PLL

CIRCUIT

The

TR-7625

employs

PLL

circuit

using

SM5111A

for

programmable

counter,

reference

oscillator,

frequency

divider

and

phase

detector.

Frequency

division

ratio.

memory

and

remote

indication

functions

are

all

controlled

BCD

codes.

PLL

OUL

SIIIA

$C1815

ORO

—_

? <

‘o

Fig.

PLL

Circuit

TR-7625

CIRCUIT

DESCRIPTION

Phase

Locked

Loop

The

130

MHz

signal

from

Q27

passes

through

the

buffer

circuit

Q28

and

then

divided

into

synthesizer

output

Q11

and

loop

output

Q12

respectively.

The

output

from

Q12

mixed

with

the

local

oscillator

output,

tripled

Q6,

D21

and

Q20

obtain

frequency.

The

output

amplified

Q19

and

fed

Q15

where

the

output

frequency

divided

specified

the

BCD

code

and

compared

with

the

kHz

reference

frequency

(1/1024

10,240

MHz)

The

output

thus

obtained

passes

through

the

low-pass

filter

control

the

VCO

vari-cap

diode

182208

D26.

The

output

from

Q26

controls

the

transmit

frequency

bandwidth.

When

the

signal

un-

locked,

output

shut

off

Q17

and

indicated

Q18.

Q16

shuts

off

output

when

the

rotary

switch

between

channel

setting

positions.

Freq.

Simplex

Output

Osc

Xtal

Freq.

144.00

MHz

133.3

MHz

43.7667

MHz

134.3

MHz

43.7667

MHz

145.00

MHz

145.99

MHz}

135.29

MHz

399

43.7667

MHz

3.99

MHz

135.3

MHz

200

44.4333

MHz

146.00

MHz

44.4333

MHz

147.00

MHz

136.3

MHz

137.29

MHz

44.4333

MHz

3.99

MHz

147.99

MHz

Table

Division

and

Frequency

kHz

Circuit

the

PLL

circuit,

the

reference

frequency

controlled

kHz

steps.

The

kHz

signal

controlled

varying

the

local

oscillator

crystal

frequency

vari-cap

diode,

the

frequency

division

remains

unchanged

even

when

the

kHz

circuit

operated.

The

memory

circuit

also

includes

the

same

bit

and

func-

tions

even

when

the

kHz

circuit

operating.

Shift

Circuit

Transmit

frequencies

can

shifted

changing

the

local

oscillator

crystal

frequency,

shown

below.

144

and

145

MHz

bands:

[—]

shift

43.5667

MHz

(S]

43.7667

MHz

The

[+]

shift

not

available

for

144

and

145

MHz

bands,

[S]

occurs

the

[+]

position.

146

and

147

MHz

Bands:

[—]

shift

44.2333

MHz

[+]

shift

44.6333

MHz

(s]

44,4333

MHz

Memory

Shift

Circuit

The

memory

shift

(M)

circuit

shift

the

memory

frequency

during

transmission.

CONTROL

UNIT

Frequency

settings

are

accomplished

the

MHz,

100

kHz

and

kHz

rotary

switches.

The

relationship

between

the

frequency

and

frequency

division

shown

below.

Frequency

division

144,000

MHz

200

145.000

MHz

300

145.990

MHz

399

146.000

MHz

200

147.000

MHz

300

147.990

MHz

399

The

local

oscillator

kHz

order

frequency

can

(switch)

shifted.

Frequency

division,

set

the

rotary

switch,

stored

the

latch

IC’s

and

pressing

the

memory

input

switch.

The

output

from

the

latch

circuit

fed

through

.IC’s

4,5

and

the

selector

circuit

the

PLL

circuit

pressing

the

memory

call

switch.

When

this

switch

not

pressed,

the

output

fed

directly

the

PLL

circuit.

Memory

function

effected

latching

each

switch:

The

information

from

each

switch

stored

pressing

the

memory

switch.

The

stored

information

remains

the

same

unless

the

memory

switch

pressed

once

again.

Selection

memory

output

and

rotary

output

accomplished

the

selector

circuit.

latched

output

obtained

pressing

the

memory

output

switch.

The

signal

the

PLL

circuit

passes

through

the

LED

driver

circuit

and

digitally

indicated

LED.

baton

164035

MEMORY

swiTCH

SELECTOR

4019

SYNTHESIZE

BCO

CORD

OUTPUT

MEMORY

OUTPUT

Fig.

Block

Diagram

Frequency

Memory

Circuit

ROTARY

Switch

ovrpur

TR-7625

CIRCUIT

DESCRIPTION

TRANSMITTER

UNIT

The

microphone

signal

passes

through

the

limiter

amplifier

and

modulates

the

10.7

MHz

oscillator.

This

mixed

with

the

loca!

oscillator

signal

obtain

114

146

MHz

sig-

nal.

The

(variable)

B.P.F.

provides

excellent

power

and

spu-

rious

characteristics

the

use

VCO

voltage.

The

power

stage

uses

M57712H

power

module

manufac-

tured

the

Mitsubishi

Electric

Co..

providing

high

reliability.

RI5

2208

AMP

FROM

VCT

Fig.

Variable

Transmitter

Band

Pass

Filter

Circuit

RECEIVER

UNIT

The

signal

from

the

transmit/receive

matching

circuit

passes

through

the

diode

switch

and

fed

the

2-stage

antenna

tuning

circuit,

3-stage

herical

tuning

circuit

and

(MOS

FET}

amplifier.

This

signal

further

fed

the

mixer

MOS

FET

where

converted

10.7

MHz

signal.

The

signal

thus

converted

passes

through

the

2-stage

filter

and

fed

the

2nd

mixer

where

converted

455

kHz

signal.

The 2nd

signal

from

the

455

kHz

ceramic

filter

passes

through

the

limiter

circuit

where

converted

signal

the

ceramic

discriminator.

This

signal

amplified

the

audio

power

amplifier

drive

the

speaker.

The

receiver

unit

includes

noise

amplification

type

squelch

circuit.

This

circuit

picks

the

noise

component

the

squelch

signal

from

the

discriminator

which

amplified

and

rectified

contro!

the

1st

stage

amplifier.

The

characteristic

the

discriminator

opposite

that

conventional

ones

permit

connection

remote

control.

DC+

Fig.

Discriminator

Characteristics

TR-7625

SPECIAL

SEMICONDUCTOR

DATA

CAUTION

SM5111A

Electrostatic

Breakdown

Protection

This

item

contains

built-in

input

protection

circuit

prevent

gate

breakdown

due

normal

ambient

static

presence

protect

the

input

circuit

from

damage

due

high

static

or,

voltage

(in

excess

permissible

circuit

limit),

the

following

points

must

observed:

When

the

product

not

use,

keep

all

terminals

contact

with

insulating

material

(this

done

the

factory

prior

shipment).

Soldering

iron,

testing

instruments

and

other

tools

should

grounded

while

use.

not

insert

remove

from

the

socket

without

tur-

ning

off

the

power.

not

apply

signal

voltage

the

input

terminal

when

power

OFF.

not

apply

voltage

exceeding

the

power

voltage

the

input

terminal.

OPERATING

SYSTEM

This

product

has

been

developed

with

MOS

LSI

used

for

PLL

circuit.

shown

the

block

diagram

Fig.

consists

OSC:

reference

oscillator

circuit,

DIVIDER:

reference

fre-

quency

dividing

circuit,

PC:

programmable

counter,

PD:

phase

comparator,

and

INV:

inverter.

high

accuracy

feed-

back

type

crystal

oscillator

circuit

can

formed

adding

crystal

oscillating

element.

resistor

and

capacitor

between

the

Qin

and

Qout

terminals

the

reference

oscillator

circuit.

This

also

permits

external

signal

fed

the

Qin

terminal.

The

oscillator

output

applied

the

reference

frequency

dividing

circuit

where

divided

into

the

desired

frequen-

cies

fr1

(1/2048)

and

fr2

(1/1024)

which

are

the

reference

signals

for

the

digital

phase

comparator

the

stage.

The

comparison

signal

(frequency

f1)

fed

the

input

ter-

minal

FIN

the

AMP

amplified

and

wave

shaped,

then

fed

the

input

the

programmable

counter.

The

frequency

“{1"

frequency

converted

(fpc)

through

the

program

ter-

minals

PO1

...

P33

(for

example,

when

PQ1

...

P33

the

programmable

counter

output

1/999),

and

fed

the

phase

comparator

where

compared

with

the

reference

signal

phase

that

pulse

signal,

shown

below,

proportional

the

phase

difference

between

the

two

signal

fed

the

output

terminal

DO.

fpc

_Lu

Hing

eee

eer

Bak

qor-

Fig.

The

table

below

shows

the

maximum

operation

limit

and

en-

vironmental

conditions.

any

these

values

exceeds

the

given

limits,

can

cause

damage

the

product

deterioration

quality.

Item

Symbol

Power

Supply

Voltage

Vop

-Vss

Input

Voltage

Operating

Temperature

—30~

+70

Storage

Temperature

TsTG

—40

+125

Power

Consumption

Soldering

Temperature

Soldering

Time

Table

SM5111A

Absolute

Maximum

Ratings

TOP

VIEW

VDD

Pio

FIN

P11

QiN

P12

QoutT

P13

P20

amPIN

Pat

AMP

ouT|7|

P22

FR2

P23

P30

F12

P31

P32

VoD

P33

DATE

CODE

Fig.6

SM5111A

Outline

3SK74

TR-7625

SPECIAL

SEMICONDUCTOR

DATA

SPECIFICATIONS

Application

VHF

Amplifier

{Mixer}

Construction

N-Channel

MOS

FET

(Dual

Gate)

Drain

Source

Voltage

Vosx

20V

Gate

1»

Source

Voltage

Veis

+10V

Gate

Source

Voltage

Veos

+10V

Drain

Current

Allowable

Loss

200

Channel

Temperature

125°C

Storage

Temperature

Maximum

Specifications

—5.6

+125°C

TEST

CONDITION

Item

Condition

Drain

Source

Voltage

Vois=

—

3V,

Vo2s=

3V,

lo=

500nA

Orain

Current

Vos=

6V,

Vois=

Vo2zs=3V

Cut-Off

Voltage

(Gate

Vos=

6V,

Va2s=0.

to=

500nA

Cut-Off

Voltage

(Gate

Vos=

6V.

Ve1s=0,

lo=

500nA

Gate

Leak

Current

(Gate

Vos=0,

Vois=+10V,

Vais=0

Gate

Leak

Current

(Gate

Vos=0.

Vois=0,

Vezs=

10V

Smail

Signal

Transfer

Admittance

Vos=6V.

Vo2s=

3V,

1o=10mA,

kHz

Smali

Signat

Input

Capacity

Vos=

6V.

Vc2s

3V,

jlo=

10mA,

1.0

MHz

Small

Signai

Output

Capacity

Vos=6V.

Vozs=

3V,

lo=10mA,

1.0

MHz

Small

Signal

Feedback

Capacity

Vos=

BV.

Vaas=3V,

lo=

10mA.

1.0

MHz

Output

Power

Gain

Voo=

10V,

lo=

10mA,

200

MHz

Noise

Figure

Item

Symbol

Voo=

10V,

lo=

10mA,

200

MHz

Maximum

Rating

M57712H

(TA

25°C.

unless

otherwise

noted)

Condition

Operating

Voltage

Current

Operating

Temperature

—30~

+110

Storage

—40~

+110

°C

Electrical

Characteristic

M57712H

(TA

25°C

unless

otherwise

noted)

Condition

Output

Power

144~

148

MHz,

Vec=

12V

Pin=0.15W,

Z6=Zt=

500

Total

Efficiency

2nd

Harmonic

Radiation

Greater

than

3rd

Harmonic

Radiation

f=144~

148

MHz,

Vcc=

12V

Pin=0.15W,

Zg=Zt=

500

f=144~

148

MHz,

Vec=12V

Pin=0.15W,

Z6=Zi=

502

144~

148

MHz,

Vcc=

12V

Pin=0.15W,

Za=ZL=

500

144~

148

MHz,

Vcc=12V

‘|

Pin=0.15W,

Z6=Z.=

502

144~

148

MHz,

Vec=

12V

Pin=0.15W,

=ZL=

502

Impedance

Note

GATE

DRAIN

SOURCE

Fig.

3SK74

Outline

APpwn>

Input

Terminal

(RFI)

Power

Supply

Drive

Stage

(DRB)

Power

Supply

Output

Stage

(F1B)

Output

Terminal

(RFQ)

GND

Fig.

M57712H

Outline

Knob

(SQU)

feo

Front

Glass

S-Meter

Push

Knob

(K21-0724-04)

10-061

5-04)

(B31-0616-05)

(K29-0712-04)

atic

Knob

(VOL)

(K23-0717-04)

‘Push

Knob

(K29-07

13-04)

goes

Mating

Connector

(EO07-0551-05)

(K)

Metal

Socket

(EO6-0552-05)

(K)

Metal

Socket

Knob

(Mode)

(K21-0731-03)

(K)

(K21-0741-03)

(W.7)

b(B}

Push

knob

Power

switch

03)

(K29-0713-04)

($36-2402-05)

M-Type

Receptacie

Heat

Sink

(E04-0152-05)

(FO1-0731-05)

Connector

24P

Connector

(EQ6-0252-05)

(E08-247

1-05)

(EO9-247

1-05)

(E11-0003-15)

Socket

(EC8-047

1-05)

(K)

(EO9-047

1-05)

(K)

Mating

Connector

Slide

Switch

($31-1402-05)

TOP

VIEW

TONE

Unit

Pawer

Module

(X52-1110-51)

{T)

TX-RX

Unit

(X52-1110-62)

(W)

(X44-1320-10)

Low

Power

Adj.

Protection

Adj

RF-Meter

Adj

Control

Unit

(X54-1440-10)

(K)}

(X54-1440-6

(W),

(7)

Pon

(X50-

1580-10)

(K)

(X50-

1580-61)

(W),

(T)

‘TATOSIAP

Q18~

22,2829

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