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

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

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

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

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

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

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