Radio Shack Pro-60 User manual

Radio

/hack

Service

PRO-60

PROGRAMMABLE

SCANNER

Catalog

Number:

20-309/9309

CONTENTS

Page

Specifications.2

Block

Diagram.4

Theory

Operation.5

General

Operation

Outline.

Reception

Check.8

Alignment

and

Adjustment.

Troubleshooting.

Printed

Circuit

Boards.

Wiring

Diagram.21

Exploded

View.22

Mechanical

Parts

List.

Electrical

Parts

List.

Semiconductor

Lead

Identification.47

Microprocessor

(1C

Port

Format.

Schematic

Diagram.53

1995

Tandy

Corporation.

All

Rights

Reserved.

Radio

Shack

registered

trademark

used

Tandy

Corporation.

20-309/9309

SPECIFICATIONS

Frequency

coverage

MHz-87.495

MHz

kHz

steps

87.5

MHz-107.950

MHz

kHz

steps

108

MHz-136.975

MHz

kHz

steps

137

MHz-224.995

MHz

kHz

steps

225

MHz-399.9875

MHz

12.5

kHz

steps

400

MHz-512

MHz

12.5

kHz

steps

760

MHz-824

MHz

12.5

kHz

steps

849

MHz-869

MHz

12.5

kHz

steps

‘1

894

MHz-999.9875

MHz

12.5

kHz

steps

760

MHz

-999.9875

MHz

for

20-9309

—

Unit

Nominal

Limit

Sensitivity

NFM:

(S+N)/N=20

30-512

MHz

Dev.:

kHz

760-999.9875

MHz

AM:

(S+N)/N=20

30-512

MHz

—

Mod.

60%

kHz

760-999.9875

MHz

WFM:

(S+N)/N=30

30-512

MHz

Dev.

kHz

760-999.9875

MHz

Squelch

sensitivity

NFM

and

Threshold

0.5

Tight

—

WFM

Threshold

Tight

Spurious

rejection

328

MHz

(NFM)

(except

primary

image)

Modulation

acceptance

(EIA

RS-204-A)

—

NFM

kHz

±8

±5

WFM

kHz

±150

±75

—

Signal

noise

ratio

NFM

Dev.:

kHz

30-512

MHz

—

Input

100

760-999.9875

MHz

Mod.:

60%

kHz

30-512

MHz

Input

100

760-999.9875

MHz

—

WFM

Dev.:

kHz

30-512

MHz

Input

100

760-999.9875

MHz

—

Unit

Nominal

Limit

Residual

noise

Volume

control,

set

its

minimum,

squelched

Scanning

rate

channels/sec.

22-28

rate

steps/sec.

47-53

Priority

sampling

sec.

1-3

Scan

delay

time

sec.

1-3

Audio

output

power

10%

THD

180

150

Current

drain

Squelched

100

115

Channels

operation

Channels,

frequency,

and

mode

display

Receiving

system

Power

source

Jacks

Dimensions

(HWD)

Weight

Any

200

channels

any

b~nd

combination

Liquid

crystal

display

Direct

key

entry

digital-control

synthesizer,

1st

IF:

608.005-611.2

MHz

2nd

IF:

MHz

3rd

IF:

10.7

MHz

(WFM),

455

kHz

(NFM/AM)

negative

ground

only

batteries

suitable

adapter

Antenna,

earphone,

external

power,

and

charge

7/8x2

1/4

3/4

inches

(150

mm)

8.8

oz.

(250

without

antenna

and

batteries

Note:

Nominal

specs

represent

the

design

specs.

All

units

should

able

approximate

these—some

will

exceed

and

some

may

drop

slightly

below

these

specs.

Limit

specs

represent

the

absolute

worst

condition

that

still

might

considered

acceptable:

case

should

unit

fail

meet

limit

specs.

—

BLOCK

DIAGRAM

Batteries

THEORY

OPERATION

The

PRO-60

PLL

(Phase-Locked

Loop)

synthesized

VHF/UHF,

AM/FM

receiver,

controlled

CPU

(Central

Processing

Unit)

via

keyboard.

Receiving

mode

and

step

are

initially

set

correspond

with

the

frequencies

entered.

When

frequency

within

the

broadcast

band

keyed

in,

the

receiving

mode

set

wideband

(WFM).

When

frequency

the

active

radio

band,

such

police,

fire,

and

ham

radio,

keyed

in,

the

mode

set

narrowband

(NFM),

and

when

frequency

the

aircraft

band

keyed

in,

sets

mode.

The

mode

can

also

changed

the

AM/FM/WFM

key.

All

functions,

such

the

receiving

frequency

range,

frequency

determination,

scanning

delay

time,

etc.

are

controlled

the

CPU

(IC1).

The

CPU

able

only

the

assigned

functions

and

me'

.cation

the

CPU

feasible.

The

following

paragraphs

explain

the

operation

the

circuit

terms

the

functional

blocks:

Varactor

(variable

capacitance

diode)

tuning

(automatic

tuning

system)

employed

all

bands.

The

input

circuit

consists

the

bandpass

filters

(BPF).

signal

generated

VCOI

VC02

applied

the

1st

mixer

and

mixed

with

the

signal.

The

1st

mixer

employed

facilitate

MHz

999.9875

MHz

mixing.

The

1st

(Q106)

608.005

611.2

MHz,

and

the

signal

mixed

with

VC03

frequency

the

2nd

mixer

(Q107)

produce

MHz

signal.

Corresponding

with

the

input

from

the

keyboard,

the

CPU

selects

VCOI

VC02

and

determines

the

AM/NFM/WFM

data

the

PLL

circuit

that

will

function;

then

outputs

the

necessary

data.

signal

entered

NFM/AM

mixed

with

crystal

oscillation

frequency

44.545

MHz

the

3rd

mixer

(IC301)

and

converted

455

kHz

signal.

signal

entered

WFM

mixed

with

crystal

oscillation

frequency

34.3

MHz

the

3rd

mixer

(IC302)

and

converted

10.7

MHz

signal.

The

signal

further

amplified

detected

signal.

The

signal

AM,

NFM,

and

WFM

CPU-controlled

and

applied

the

power

amplifier

(IC306)

via

switching

circuit.

Squelch

signals

are

comprised

noise

products

from

detector

output,

and

amplified

IC301

through

switching

signal,

which

controls

the

mute

and

CPU.

CXI

(4.19

MHz)

clock

which

controls

the

CPU.

Figure

shows

the

clock

waveform

IC1

58.

The

unit

has

battery-saving

control

manual

mode.

When

the

unit

operation,

IC1

and

IC309

on.

there

has

been

signal

input

key

input

for

than

seconds

manual

mode

with

squelch

on,

goes

"L"

(Figure

B),

turning

off

IC309

shut

off

the

power

supply

for

most

the

circuits

(except

the

CPU

and

audio

circuit).

this

battery-saving

mode,

the

unit

uses

only

40%

the

power

required

for

normal

operation.

Any

unstable

supply

voltage

the

CPU

can

produce

CPU

malfunction,

such

wrong

data

processing,

wrong

data

transfer,

etc.

overcome

this,

the

CPU

can

initialized

when

necessary.

initialize

the

CPU,

press

and

hold

CLEAR

and

then

turn

the

power.

Figure

GENERAL

OPERATION

OUTLINE

Turn

the

KEY

LOCK

switch

the

keys

will

not

function

except

SCAN,

MAN,

and

LIGHT.

RECEPTION

CHECK

—

ALIGNMENT

AND

ADJUSTMENT

ALIGNMENT

AND

TEST

POINTS

and

(10

pF)

are

connected.

ALIGNMENT

PREPARATION

Test

Equipment

Required

•

Oscilloscope

•

SSVM

•

SSVM

•

8-ohm

dummy

load

•

AM/FM

signal

generator

Notes:

•

Use

non-metallic

tuning

tools.

•

The

test

equipment

and

receiver

should

warmed

for

least

minutes

before

proceeding

with

align¬

ment.

•

The

signal

level

from

the

generator

should

kept

low

possible

obtain

usable

output.

•

Distortion

meter

•

Frequency

counter

Program

channels

through

are

follows:

Table

Channel

Frequency

and

Band

Mode

Channel

Frequency

and

Band

Mode

512

MHz

(NFM)

155

MHz

(NFM)

MHz

(WFM)

225

MHz

(NFM)

MHz

(NFM)

126

MHz

(AM)

760

MHz

(NFM)

31.995

MHz

(NFM)

999.9875

MHz

(NFM)

MHz

(NFM)

—

ALIGNMENT

PROCEDURES

PLL2

VCO

Alignment

Control

Setting

Test

Instrument

Connection

Adjust

Result

OFF/VOLUME

control:

ON.

SQUELCH

control:

Fully

counterclockwise

(CCW).

Select

channel

Connect

SSVM

TP103.

See

Figure

Adjust

2.4+0.1

volts

the

SSVM.

See

Table

PLL1

VCO

Alignment

Control

Setting

Test

Instrument

Connection

Adjust

Result

OFFA/OLUME

control:

ON.

SQUELCH

control:

CCW.

Select

channels

and

Connect

SSVM

TP102.

See

Figure

Select

channel

and

adjust

for

25.5±0.5

volts

the

SSVM.

Select

channel

and

sure

the

SSVM

reads

0.8-3.0

volts

(no

adjustments

are

necessary

for

the

coil).

See

Table

DCSSVM

Figure

Ajustment

Coils

and

Each

coil

should

adjusted

carefully

changing

the

pitch

the

coil

little

using

non-metallic

tuning

tool

shown

Figure

Squeeze

the

coil

increase

the

voltage

and

stretch

the

coil

decrease

the

voltage.

Notes:

•

very

careful

when

doing

coil

pitch

adjustment

be¬

cause

greatly

affects

the

frequency.

•

Secure

the

coil

with

glue

after

alignment.

sure

the

glue

dry

and

the

coil

secured.

Also,

sure

that

the

environmental

temperature

normal.

Then,

repeat

VCO

(PLL2

and

PLL1)

alignments

above.

Figure

Coil

Use

non-metallic

tuning

tool

uumfj

PCB

Table

Frequency

Voltage

MHz

760

MHz

Voltage

TP103:

2.3-2.5

volts

Voltage

TP102:

25-26

volts

Voltage

TP102:

0.8-3.0

volts

—

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