Electra Bearcat BC3-L, Bearcat BC3-H, Bearcat BC3-L/U, Bearcat BC3-H/U, Bearcat BC3-U Operating Instructions Manual

GENERAT

DESCRIPTION

The

FM monitor

band

channels

Bearcat

III is a table

rectiver

in one or

Bands at 30-50mHz,

features

Its

modules;

r-f

high

used; switches

Emitting Dode

Iight

sensitivity

arrd external

speaker

include:

plug-in

B

speed

to omit scanning

control; jack;

motile

and

providing

of the three

two

L4,6L74mHz

and

provisions

crystals

automatic

channel

in any

or manual

undesired

of

indicators;

front-mounted

for ll7Yac

cables

Size: 9"W Weight: Cabinet: Power Requirements: Audio

tones).

Output:

External

model, single

automatic

scanning

Public Safety/Business 450-47OmHzfor

one or

two

combination

scanning;

channels; solid

comtination

x 5" speaker;

3"

or l2Vdc

x

35/B"H

operation;

x

5lbs.

Heavy duty

vinyl-clad

ll7

W rms, voice

3

speaker

connector

Vac, l2

dual

or

of B

plug-in

be

may channel

state

squelch

SPECI

61iB"D

steel.

and

The incorporated

are

and

r-f modulation.

filters

i-f improves

gri;, multivibrators nels channels.

FICATIONS

Non-sliding

l3.B

Vdc,6

protected

W;

(Power

provided.

operation

detection,

are scanned

from

most advanced

mixer transistors

Single conversisr

reduces

selectivity;

and gates

feet.

W-

at

a

in this

spurious

audio

with

W on

1.5

tele*oflng

singfe

developments

receiver;

provide

into

responses

inteEated

linear

amplification

provide

time

no

continuous

in

dud-gate

ncise

low

monolithic

and

scanning

lost

oqtjde

c

state

solid

\lOS

and

guartz

radiation

and

circuits

output;

desired

logic;

scanning

antenna. circuitry

Field

low

provide

TTL

unwanted

Effect

cro$s-

crystal

and

i-f

I'C'

chan-

Antenna:

mobile antenna

or

Input

Sensitivity:

deviation,

Channels: be scanned

Frequency

f,ow band High band UHF band

Telescoping

lmpedance:

H and

microvolt

.7

Up to

iutomatically

Range:

*30-50

xl46-L74

450-470

50-;0

B

(*Factory-supplied supplied'with' special

Scan

request.)

Rate:

Crystals:

150-f74

Approximately

Miniature

Accessories Supplied:

bracket

ing

"ficcessorv" SYSTEMS

Panel

Front

Manual-Scan

channel

Dode

by Underwriters'

Usted Certified

I

or

ONLY).

Features:

Channel

indicators

under

iI7

"Radio"

FCC Reg.

antenna

(supplied).

ohrn-..

L bands:

for 20

crystal-controlled

mHz, total

mHz,

dB

or selected

spread

total

mtJLz, total

alignment

f9t [,ott band

mHz alignment.

channels

25

plug-in

All-band

Vac

type

power

HC-25/U telescoping

cable

?use block.

Squelch

Select

/

control

Switch

Forward-facing

Laboratories,

Part

15.

Connector

readable

at

signal-to-noise

channels

individually

mHz.

15

mHz.

spread

24

20

mHz-

is

Other

per

second.

easy user installation.

for

antenna

Vdg

t3.g

/

USE

FOR

Volume

/

channel

B

/

3"

x

5"

Inc.

for

t

slightly

band

bands)

two

combination.

High

available

are

mo^bile

microvolt

.25

ratio:

(in

one or or

3348

alignments

Universal

/

provided

U

in any

mFrz.

pgwe_t_9ahl_e-(Connects

B

/

Light

GROUND

Combined

Emitting

WITH

on-off

switches

NEGATIVE

corrtrol

/

speaker.

outside

kHz

5

less'

-aY

band is

on

mount-

to

-2-

INSTALLATION

This

receiver accessories for in

areas

of

whip

antenna

If

an

outside antenna

you

may

use antenna for U models the using

only. External

receiver

the

supplied

antennas are

MOBI

LE INSTALLATI

is shipped

mobile

fair-to-good

supplied, may

a l55mHz

L and

by

50 ohm coaxial

available

INSTRUCTIONS

complete

or

table use.

rip"l strength,

be used

is necessary

antenna

L/H

models

antennas

automotive

at most radio

ON

cable, type connector.

fu a fixed receiver

on all bands.

for

on

all bands.

or a 4.6&nHz

should be coupled

zuch

dealers.

with

the

telescoping

fringe

antenna

as RG-58 A/U,

necessary

reception.

a 40mHz

on

to

Suitable

noise

The other areas is

too

parts

of low

lengthy

generated by the

car is

of the

signal strength.

deal with adequately

to

It is recommended for with the book" or

subject to

"The

purchase

Mobile

Radio Relay [,eague and

further

It is vice center communications

OPE RATI

recommended that which

specializes

equipment for correction

ON

auto electrical

sometimes

a problem, particularly

The subject of noise elimination

in

instruction book.

this

who wish

those

"The

Manual" published

by most

sold

the

in VHF-UHF

to become

Radio Amateur's

by the

electronic

vehicle be

parts

taken to a ser-

two

noise problem.

of a

system and

in

familiar

Hand-

American

stores.

way radio

This

receiver

having

In receive police of this radio

ization be responsible

l.

2.

3. Insert

4. Attach

5. External

\-OLT

a l2

some areas it

is responsible

throuch

Plaee hold

\lark

:H:

inrt-ard, secure the receiver and

two

"accessory"

above. extended duced

mav

be installed

\EG

{TI\E

is

illegal for

communications

for

local

agent-ie5

for

anv

illrgal

the motile

the receiver in

and drill

the bracket with

the

in

U4"

the DC power

mobile

The

for

to approximately

mounting

two holes

plastic

two

the desired pair

in place

ID

x

9116" OD flat

"radio"

or

antennas

automotive

L,

H

in anv car.

GROU\D

unauthorized

on

a mobile

obtaining

ap6l Electra

installation

bracket under

the

desired position.

using

the

two

"T"

washers, of mounting

with

cable

terminal

may

antenna

or L/H

models.

18" for

truck.

SY-ITE\I.

receiver.

any necessary

Conrpanr

usage.

or

a 7164

the

washers.

and connect

be used

U models.

No.

6

flanges

two ll4-20

on

the

may

be

It

drill

self-tapping

fuse

as described

should be re-

boat.

etc..

persons

The

user

author-

cannot

the dash

bit

and

turned

holes

and

bolts

it

to

block.

used

fully

the

\\ith

l.

to

2.

to

the porter

turn

the receiver

conrol Place Set

clockwise.

the B channel

the

Adjust rushing control

cable and antenna properly

O\ by rotating

switches in

"\IA\UAL-SCA\"

"SQUELCH"

the

noise

heard.

is

counterclockwise

control

Then

until

connected,

"VOLUME"

the

the up (ON) position.

switch

adjust

"MANUAL".

on

clockwise until

"SQUELCH"

the

the rushing noise

the

dis-

apPears. Press

continue should the to quiet TWEEN

The

6.

to

7.

To UAL-SCAN" be

switch

select

sample

omitted

"MANUAL-SCAN"

the

to step

"break

squelch

through all channels.

the

squelch"

control counterclockwise

the receiver.

STATION

TRANSMISSIONS.

"MANUAL-SCAN"

and monitor

channels

all

any desired

switch to

desired

as

by moving

downward (offl.

switch

on any channel,

THIS MUST

switch

may now

channel.

automatically,

"SCAN".

Any

the individual

downward

If

again

BE DONE

return

the

channel may

and

noise

the

adjust

slightly

BE-

be used

"MAN-

channel

-3-

CRYSTAL

INSTALLATION

DISCONNECT POWER

LEAVE

To bottom cabinet.

view and

Ihe three

No. crystal outside row. nearest one outside used.

inetalled

be crystal frequency which it

POWER

remove

rear

edge. Push

The

easily

l. The

will be

them

row

A

total

in

is connected.

OFF WHILE INSTALLING

the catinet,

components

accessible.

crystal

second

$n row

inetdled

Ihe

outdde rows

on the

will bc-used

eight

of

ary order and in

is proper for

BEFORE

first remove

the rear panel

and

crystal

sockets

betrpen

oppodte

crystals

at the

of 3 ie

connect

dde of

wheNr only

may

either burd

the

REMOVING

the

forward

sockets

front

are

for

channel

the centcr

to

the

the boerd. only

one r-f

be used.

as long

particular

CABINET

CRYSTALS

screw at the

through the

in full

are

for

channel

2 etc.

row

Each

and sre

r-f

module

They may

as each

module

is

to

6'L:'

USER

man-made lines, fluorescent etc. such of unusuallv

this receiver because

conditions prevents channel switch.

Reecived frequ€ncv

Example:

453.250

HINTS

Radio

equipment usually operates

electro-magnetic noise which

lights,

Modern.

sources but

Dstant

radios

are designed to

operation

noise.

strong

"rhp''

weah

intemrpt

reception

ma,v

be bypassed by means

-

10.80 mHz = crystd

9

-

mllz

10.80 mHz = 49.16111 mHz

9

motors,

or

its high

of

scanning or

of other desired

appliances, ignition

minimize interference

may

be affected

noise

siErals

sensitiuity.

whenever

frequency.

in an environment of

under

be

Whenever

very

busy

from

power

systems,

from

conditions

received by

such

channel

affected

panel

radiates

may

a

signals, the

its individual

of

I

I l(on

L,

H

or U modules may

Remove

crystal

the straight

down.

MINIATURE

WILL

AND NOTE:

by

our

Do not install

Rigid

quality

Electra

warranty

caused by crystals

Unless

450mHz the within

"L"

to

33mHz

these

crystal

the

by

aligning the

DO NOT

SOCKETS

BREAK

standards

Company

does not

from

ordered

470mHz,

to

spreads.

OFF

otherwise

4BmHz. New

CRYSTAL FORMULAS '6H"

"L))

Received frequency

Example:

155.01

Received frequency Example:

35.80

CRY

STA L S

tll

E

TODUL

RF loDuLE'B'

eorror

trDE

Figure

by

a gentle pull upward.

pins

with

BEND ARE MADE IF

BENT EXCESSIVELY.

two crystals

are

applied

to assure full

include

other

sources.

the

6'H)'

the

-

10.80

3

mHz - 10.80

*

fdgO -H,

mHz + f0.80

cn vsrrue

roDuLE

\

nF toouLE

be in

I

the sockets

THE

SOCKETS.

OF SPRING

of

the

to crystals

performance,

correcting poor

"U"

150mHz

frequencies

mHz = crystal frequency.

mHz

position.

either

and

BRONZE

frequency.

same

furnished

therefore

operation

alignment

spread

to l7$mHz,

may

be added

=

48.07000 mHz

=

crystal frequency.

=

46.60000

I

't'

Insert

pushing

THESE

is

and

mHz

The

squelch control in addition, comes a

weak strong

channel

desirable pickup medium

under

with

ing

will Continuous-carrier casts be received switches.

tion conditions systems, power setting of

antenna

blies.

RADIO Local Govemment

Highway Maintenance

Foresty-Consenation Motion Special Industrial TelephoneMaintenance Automobile Emergency Public Mobile

sensitivity control.

signals or

signals.

may

In

cases

to reduce

below

and

Single-channel

Operating Instructions.

"MANUAL-SCAN"

the

out all

but

always

be

on 162.55mH2,

ln

mobile

the

When

moving

to

avoid

SERVICES

Pictures

Mobile

Telephones

-4-

functions

it

as

is rotated counterclockwise

By careful

can

be adjusted to receive only medium or

Interference

be reduced

of strong interfering

the

critical

a

strong

riprl ane:rs.

operation may

desired

the

on that channel even

signals

which

when

desired

service the commonly

are

signal

lines

and

squelch control

or

shipping the radio, remove

damage

Radio Petroleum

from

in

this manner.

length

of the antenna

lerel.

switch in

channel.

such as the

are available in

by use

fading,

proximity

will minimize

it

to

or

Emergency

Special

-Hospitals

-Ambulances

-Physicians

-Disaster

-SchoolBusses

Power

Forest

Products

in

normal manner and,

the

setting,

weak

signals on the

noise

or

signals

This

mar tr

be

obtained

It

may

also be

position

either

This

assures

when

turned

ESSA

many

of the individual

encountered poor

nearby

to

shong signals. Careful

these conditions.

to the internal

Relief

farther,

to reduce noise

ven- effective

accomplished

that the radio OFF

weather

faulty

the telescoping

circuit

Police Fire Press Business Railroad Taxicab Marine Manufachrrcrs Motor Rurd Radio

it

can

it

accept

same

it may

as described

by lock-

and ON.

broad-

areas, may

channel

recep-

ignition

assem-

Carrier

be-

be

in

ALIGNMENT

I-F

SECTION

Alignment and balancing by quartz tivity. Field

crystal

alignment

l.

2. Connect

3.

4.

of

the I-F

the detector

filters

and

should

Connect

Maintain

prevent

to

Adjust ripple.

system

rot be

Sweep generator

sweep

oscilloscope

output of

Tf and

See Figure

consists

output. "peaki.g"

necesqan-

EOUIPMENT

and

generator

distortion

T2

The

Oscilloscope

l0.BlmHz

tO.BmHz

for

2.

lo.8

t o.8l

of optimizing

bandpass and

the coils can result

but the procedure

NEEDED

with

10.79,

10.80

markers

to TP-l through

to

TP-2.

sweep generator

from

overloading.

maximum output,

the input

center frequency

in

bandpass

is

lpf

a

at a

and minimum

and output networls

ripple

for

given

general

capacitor.

low

level

are established

poor

or

information.

sensi-

-{LTER\ATE \lodel

+

25kc. \larkers

disturbed. test modules,

maximum DESTROYED

800 Generator

DO

NOT

The R-F

The unique

performance

Connect is in center See ligure

METHOD:

are not essential

ATTEMPT

alignment

Factory

alignment

output

indicators

R-F

system inclurles

BY

AN

over

ATTEMPT

Figure

2

scope

to

;in

of discriminator

3.

I-F

alignment

or equivalent

since

R_F

ALIGNMENT

points

are adjusted

involves

and

training

electronic

a wide range

TO

"PEAK

TP-2

and adjust T3

curve

and

may

be

tuned

multi-frequency

to an operating

eenter frequency

SECTION

"PEAKING''

OR

and

sealed

beyond

of frequencies.

the

tracking

UP'' OR

Figure

3

so that l0.BmHz

for

best linearitv.

checked

at the factory signal

scope

of R-F

THIS PERFORMANCE

"TWEAK''

using

a Measurements

frequency

is determined

OF R-F

generation of normal

and oscillator circuits

MODULES.

and

systems, add-on

service activities.

"OPTIMIZE'.

OR

and

swept

by

the filter.

should not

CAN

ETC.

be

for BE

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up or down, of the

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LOGIC CHART

for counting

I.C.-4, pins

trol

C\\'/CC\l'

A/B

on

B &

side

is

shown

(*) change state on

9

"Manual-Scan"

by

"0"

Switch.

under

SERVICING

It is recommended that servicing of this

factory

by the maintained at the all of our

include antenna. include a brief. having.

features conventional transistors attempted

facfurer's recommendations these

since

damage semicon

products.

When

returning

crystals,

Disconnect cables and

The receiver

four

of

bi-polar transistors,

and

by anyone

devices. The

can deliver

they

SERVICE

center. Special

service

factory

to give

fast

radio receivers to the

ac

and dc

power cables and telescoping

antenna,

detailed description of the

circuitry

types

integrated

is designed

of semiconductors:

circuits. Servicing should

is not

who

and cautions

use of ohmmeters

voltages and currents

duc tors.

PARTS LIST

receiver be

equipment

efficient

and

factory

pack carefully

difficulty

utilize

to

rectifier

insulated-gate

familiar

is particularly

with the

relating to

large enough to

done

and skills

service

for

service,

)'ou

the

diodes,

field-effect

not

manu-

each

hazardous

are

on

and

are

best

be

of

Unusual

tuning system

circuitry

in the I.C.-201 and the to scanned. manner. loading

coil

"U"

The

Also, when the

[,-1 is switched

the antenna,

track

circui t.

output

Audio

measuring

by

or

tion modulation tone

decrease

integrated

po$-er

The

l.6v

polarized

as shown

is received,

approximately

to

circuit

voice communications.

for

indicators

LED

and

The

may

at

20ma.

When a channel

lamp or

the

lamp;

refer to the

the switching

not, check the

if

logic chart.

in this

o'f,"

associated

r-f

and

is broadbanded

"Ll'

is measured

power

the an oscilloscope.

on

the output

half power

from overload.

have a

current should

be damaged

not light, the

does

lamp

I.C.

receiver includes

"H"

and

modules.

circuits generate

oscillator

module

circuits

in

is

into the

more conventional

a

operating,

telescoping

with bursts

maximum

excursion

When a

full power

will start

at

to

protect

It will then

forward

voltage

not exceed

high

by a

failure

If

channel

the

When groups

the

tuning

as channels

the

of

continuous

the

return

drop

50ma.

reverse

may be

works,

lamps

of

automatic

I.C.-101,

voltages

are

antenna antenna

modula-

voice

on

and then

output

full

to

of about

They are

voltage.

either

the

check

are out,

Ref. No.

(pRrcES

SUBJECT'l'O CHANGE

MAIN

BOARD

Resistors,

Capacitors

mf.

.001

mf.

.01 .O47mf

mf. GMV

.l

3.3pt .02mf. 20% .22mf l50pf 20%

.l0V

25mf

I 00pf 20%

l00mf. 3V 500mf. .047mf. 2000mf.20V

l00mf.

35V

2mf.

WTTTTOUT

t/+W

lOTo

Disc. Cer. ............

20%

Disc Cer. ................

20%

Disc. Cer. ...........

GMV

.

Disc. Cer.

lO%

Disc. Cer. ...............

Mylar.

.10%

10V

l5V Lytic..

Cer.

Disc. Lytic..

Cer.

Disc.

Lytic....

Lytic..

Mylar.........

Lytic..

Lvtic.........

NOTICE)

List

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

Price

.50 .50 .50 .50 .50 .50 .50 .50

1.00 .50

1.00

1.00 .50

1.50

1.00

.15

Semi-Conductors

F.

.........

2N3563 MPS3393

C.

Mot.

.........

List

2N3640.....

T.I. ...........

TrP-29

I\+ I +8......

rN3+A.......

5%.............

IN524lB

llV rN400l LM703LN SN76643N T,4.-61lC

Nat. ..........

ULN2I

or

S.G.S.

I I A......... 4.00

sN-7474....

sN-7426....

Emitting

Light

A-259

Inductors A-219-1

A-218-l A-205-l

A-261 B'-217-2I.F.

B-2O2PowerTransformer..........

Miscellaneous A-135

(Frequenciesasrequired)...........

Slide Antenna Connector Antenna

PowerConnectorP3304AB.......

LoadingCoiI.......,.........

RF

Choke.. RF Choke.. RF

A-218-2

A-226

8-254"Manual-Scan"Switch.....

Ext.

Power Socket

Cord Assembly...

DC AC Cord \Iobile 8-248 Speaker

A-138-2TelescopingAntenna....

8-228 C-233

C-203WrapAssembly.....'..........

A-237AntennaBushing.............

Knob RB-I55-840.......

Choke..

Coil.....

Crystal

Switch,

Plug

Speaker

Jack

Assemblv...

\lounting

Pane1.........

Front

Trim..........

Diode.......

Fi1ter.........

SPDT.....

No.

1200..............

No.

No. 351

FHTM...... 1.00

5-3304

Kit.................

x

5" 3.2

3"

1207....

2A.....

ohm.

Price

.75 .75 .7

1.50 .50

.50

1.00 .50

1.50

5.00

2.00

1.00

1.50

1.00

.50 .50 .50 .50

2.00

3.00

5.00

10.00

2.00 .7b .7b

.7

1.00

1.50

2.00

3.00

1.50 l '7

3.00

7.50 .75 .75

5

b

5

SERVICE PARTS

(Continued)

LIST

Resistors.

V+W

l0%

List

Price

List

mf.

I

.00

I mf.

.0

6.8pf 56pf l0% Disc. Cer.

Semi-Conductors

3N201 r.r. 2N3563

2N3640.....

I N34A.......

LM703LN

Disc.

2OTo

l0% Disc. Cer.

Ccr..............

Disc. Cer.

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

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

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

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

F.C.

.......... .75

Nat........... 1.50

.50 .50 .50

.50

2.50 .7

.50

Inductors

ts-208-3AntennaCoi1...............

4'-218-3 RF

8-208-4

,\-218-2 RF

B-22O-l Osc.

Choke..

RF

CoiI...... 1.00

Choke..

Coil 1.00

B-209-lTrackingCoil..............

A-218-l

Resistors,

RF

Choke..

V+W. lO%

1.00 .50

.50

1.00 .50

3.3k........... .25

15k............

.25

22k............ .25

{.7k ..........

68k............

.25 .25

100............ .25

33k............

330............

1.5k...........

10k............

k..............

I

.25

.25 .25 .25

5

C;rpacitors

3.3pf l0% I .7-6pf l5pf l0% Disc.

22opt 20% .00lmf. .0lmf. l0pf l0% Disc. 5pt 5% Disc. 68pf 5% Disc. Cer. 27pf I 5pf l0% Disc. l00pf 47Opf 5pf

Semi-Conductors

3N201 T.r............

2N3563

MPS-3393..

Inductors

A-221-lAntcnnaCoil...............

4.-218-4 RF A-221-2 RF

A-218-2 RF 8-220-2 RF A-218-l A-218-3 RF Choke..

Disc.

variable......

Disc.

2O%Disc.

20% Disc.

Cer.

lO% Disc.

l0% Disc. Cer.

Disc. Ccr.

20%

Disc.

l0%

Cer.

F.C.

..........

Choke..

Coil.....

Chokc..

Coil......

RF Chokc..

Cer.

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

Cer.

................ .50

Cer.

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

Cer.

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

Cer.

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

Cer.

..........

Cer. Cer.

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

................. .50

.50

.7 5

.50 .50 .50 .50 .50 .50 .50 .50 .50

2.50 .75 .75

.75 .50 .7 5 .50 .75 .50 .50

Electra

co.

Replacement

-

P.

o. Box

29243 - 300

order for parts

Cash

parts

may

be

s. count-v Line Rd.

rvill

orrlere<l

be

shipped

dire ctll'

-

cumberlancl,

prepaicl.

from:

Inrl.

46229

RETURN

WARRANTY

CARD

WITHIN TO

DAYS

NOT ABUSE

DO

NBVER REMOVE

This receiver is guaranteed to be

We agree to remedy under normal installation, is

delivered to us, intact, to our provided

accidents, incorrect wiring not

instructions furnished

our

factory, within

such examination discloses, in

This warranty

factory.

does

defect

such

use and

for

one year

not

by us, nor

apply if the receiver has been

MODIFY

OR

A SERIAL

WARRANTY

free

from defects in material

fumish a new

or to

service,

examination,

our

from

our own;improper

receivers

to

discloses

the date of sale to the original

judgment,

our

RADIO

NUMBER

part

in exchange for

defect,

such

with all transportation

it

that

is thus defective.

subjected to

installation,

have

that

been repaired or altered

or to

workmanship.

and

part

any

provided

the

charges

purchaser,

misuse,

use in violation of

which,

receiver

prepaid

and

neglect,

outside

This warranty excludes

in no event

shall

purchase price

the

PLACE WARRANTY IN FORCE FILI,

TO

MTHrN

TEN

be

of

(10)

tNI-201-2

all oral

liable for

the alleged

DAYS OF

VISIO\

DI

300

or

other implied

damages

defective equipment.

for

a breach of warranty in an amount

PURCHASE.

ELECTRA

OF

East

Cumberland,

\,IASCO

County

Indiana

COMPANY

Line Rd., South

warranhes,

AND RETURN

OUT

CORPOR

16229

\1'I0\

ild the

manufacturer

exceeding

WARRANTY CARD

-r2-