Electra bearcat IV Operating Instructions Manual

Bearcat

The
monitor
in

146-l74m]Hz,
clude:
any

uai scanningi
channels;
quieting
ternal

and

receiver

the

of

all

Full-band

combination

solid

squelch

speaker

operation

is a

IV

providing

Public

four

450-470mH2,

coverage

be

may

control;

from

switches

l,ight

cables

a single

channel

state

jack;

mobile

and

table

automatic

safety/Business

4?0-5L2mHz.

and

4 bands;

all

in

high

used;

omit

to
Emitting
front-mounted

for llTV

telescoping

model,

scanning

Bands

plug-in

B

automatic

speed

scanning

channel

Diode

3"x5" speaker;

l2V

ac or

or

GENERAL

four-band

channels

B

of

30-50mHz,

at

features

Its

crystals

or

undesired

of

indicators;

operation;

dc

outside

antenna.

DESCRIPTION

FM

are
r-f

in-

in

man-

ex-

SPECI

modulation.
i-f
i-p.ou",

gri;,
multivibrators
nels
channels."'-"4;;"clusive

FICATIONS

most

The
incorporated

mixer

and

filters

detection,

are

pacitators

advanced

this

in

transistors

"orr""ri*

Single

reduces

spurious

selectivity;

",rdio

gates

and

"*ith

scanned

track-tuning

provides

high

developments

receiver;

dual-gate

provide

into

resPonses

inteEated

linear

amplification

o

time

scanning

prbuidr

't

system

performance

in solid

noise

low

monolithic

and

circuits

and

logic;

scanning

lost

using

full-band

circuitry

state

Effect

ltield

MOS

cross-

low

and

crystal

quartz

TTL

and

i-f

I'C'

chan'

radiation

provide

output;

desired

unwanted

voltage-variable

ca-

coverage.

9"W

Size:

Weight:
cabinet:

Power

5lbs.

Heavy

Requirements:

Antenna:

mobile

or

lmpedance:

Input

sensitivity:

microvolt

.6
Channels:

selected

individually

Frequency

band

Low

band 150-1?4

High

band

UHF

"T"

UHF

Rate:

Scan

x 35/B"H

vinyl-clad

duty

Telescoping

antenna

50-70

L

H and

dB

20

for

B crystal-controlled

Up to

or in any

Range:

mHz

30-50

mHz,

450470

band

mHz,

470'512

Approximately

x 6l/B"D

steel.

ll?Vac,

15W;

antenna

(supplied).

ohms.

bands:

readable

signal-to-noise

combination.

total

total

mHz,

25

33-4BmHz)

spread24

spread

spread

total

channels

(Aligned

Non-sliding

l3.BVdc,

10W'
Connector

microvolt

.25

at

U/T

ratio:

channels

may

mIJz'

mHz'

20

mHz

42

per second.

feet.

slightly

band

be scanned

provided

SkHz

1

for

less.

outside

for

deviation'

automatically

or

Crystals:

Accessories

ing
ilX"."oo.""

SYSTEMS

Front

Miniature plug-in

Supplied:

bracket

ONLY).

Panel

Manual-Scan

channel indicators

Dode

by Underwriters'

Iisted

Certified

under

'itZ

I

or

Vac power

"Radio"

Features:

Channel

FCC

Reg.

HC-25/U

type

All-band

telescoping

cable i t-g.g

iuse block.

Squelch

Select

/

control

Switch

Forward-facing

Laboratories,

Part 15.

FOR

/

-2-

easy user

for

antenna

USE

Volume

/

channel

B

x 5" speaker'

3"

Inc.

installation.

Universal

/

Vdc

_po-wel-q"!l^q--(!onnects

WITH NEGATM

on-off

switches

mobile

control

Light

B

/

GROUND

Combined

/

mount-

to

Emitting

INSTALTATION

INSTRUCTIONS

This receiver
cessories
of
supplied.

may use a
L

nal antennas should
coaxial cable,
motive
most radio

MOBILE INSTALLATION

having

receive police

of this
ization
he responsible

for

fair-to-good

may

If

an outside

l55mHz

H bands or a 460mHz antenna on U band only.

and

type

receiver

This

VOLT

a 12

[n

some areas it is illegal for

radio

through local

Place

l.

hold

is

shipped

mobile

dealers.

is responsible for

or table use.

signal strength,

be used

antenna is necessary

antenna on all bands, a 40mHz antenna

be coupled to the receiver by 50

as RG-58 A/U,

such

connector.

may

be installed in

NEGATIVE

communications

agencies and Electra Company

for

any illegal

mobile

the

the receiver in

complete

As a fixed

the telescoping

on all bands.

Suitable antennas

GROUND

on

a mobile receiver.

obtaining

installation

mounting

the desired position.

for fringe

using

any car,

unauthorized

bracket under.the

with

the necessary

receiver

the

are available

truck,

SYSTEM.

necessary

any

usage.

or

ac-

in areas

whip

antenna

reception, you

for

Exter-

ohm

supplied

auto-

boat, etc.,

persons

user

The

author-

cannot

dash

to

to

The BC-4 has

squelch system.

electrical

system and other

problem, particularly

ject

of noise elimination

ly in

this instruction

It is

recommended for
with the
book" or

subject to

"The

Radio Relay

at

It is further
vice center which
communications equipment for

high noise immunity

However,

in

areas of

is

the noise

parts

low

lengthy

too

of

book.

those who

purchase

"The

Mobile Manual" published

l,eague and

recommended

specializes

by most electronic

sold

that the vehicle

VHF-UHF

in

correction

because

generated

car

the

signal

strength. The

to deal with

wish

to become

Radio

Amateur's Hand-

by

be taken

of a noise

of the noise

by the

is

sometimes a

auto

sub-

adequate-

familiar

American

the

parts

stores.

to a ser-

two way radio

problem.

OPE RATI ON

Mth the power cable and antenna properly connected,

l.

turn the receiver

by rotating

ON

"VO[,UME"

the

control clockwise.

3.

Place

the B channel switches in the up
Set
Adjust

rushing
control

"MANUAL-SCAN"

the

"SQUELCH"

the

noise

heard.

is

counterclockwise until

Then

switch on

control clockwise until

adjust the

the

(ON) position.

"MANUA[,".

"SQUE[,CH"

the

rushing noise dis-

apPears.

Mark

and drill

secure

the bracket with

screws.

Insert

3.

4.

5.

the two
inward,
secure the receiver
and

two ll4" lD x

Attach
"acccssory"

External
above.
extended for

approximately

holes

two

plastic

in

the desired pair

in place

9l16"

DC

the

mobile

The autornotive

power

"radio"

or

antennas may

L

H bands. It

or

lB" for U bands.

using

a 7164 drill

the two

"T"

OD flat washers.

cable

terminal

antenna

No.

washers,

mounting holes

of

with

the twoIl4-20bolts

and connect

on

the

used

be

may

should be reduced

bit and

6 self-tapping

flanges

turned

and

it

to the

fuse

block.

as described

be used fully

to

-3-

Press

5.

continue
should
the
to quiet
TWEEN

The

6.

to

7.

To
UAL-SCAN"
be omitted
switch

"MANUA[,-SCAN"

the

to step through all

"break

the squelch" on any channel,

switch

channels. If

squelch control counterclockwise

the receiver. THIS MUST

STATION TRANSMISSIONS.

"MANUAL-SCAN"

select and monitor

sample

channels

all

switch to

as desired by moving

switch

any desired cl"rannel.

automatically, return

"SCAN".

may now

the individual channel

downward ("f0.

downward and

noise

the

adjust

again slightly

DONE

BE

the

be

"MAN-

BE-

used

Any channel may

CRYSTAT

DISCONNECT

LEAVE POWER

remove

To
tom rear
inet. The components
easily

of
corresponding to its channel.
the

band for each

a particular channel,
position.
position
the third or
mHz)

edge.

accessible.

Up

to

L, H,

or

radio)

The

of the

andooT"

POWER BEFORE

WHILE

OFF

cabinet, first

the

Push

eight crystals may

U/T

bands. Each crystal is installed

eight

three-position

crystal.

(Nearest the

switch selects

o'U/T"

(470-5l2mHz)

rear panel forward

the

and

To

place

the corresponding

front

position

INSTALLATION

REMOVING

INSTALLING

remove

crystal

installed

be

(Channel I is nearest

slide

select

of the radio).

"Hi"

used for

is

bands.

the screw at the bot-

through

sockets are in

in any combination

switches select the desired

"Lo"

Band

(30-50mHz)

switch

The

Band (150-l74mHz) and

both

CABINET

CRYSTALS

cab-

the

full

in the sockets

center

"U"

and

view

the side

in the

"H"

or

(450-470

for

"L"

,,UIT"

Received

frequency - 10.80 mHz =cr1 stal

frequency

I

Example: 453.250

mHz - 10.80 mHz = {9.16llI

mHz

9

USER

man-made

lines, fluorescent

of

etc.
such
of

this

conditions
prevents
channel

HINTS

Radio

equipment

electro-magnetic

lights, motors, appliances,

Modern radios

sources

unusually

Distant

weak,

receiver because of

interrupt

reception

may

are

but

operation

noise.

strong

".hp"

be bypassed

usually

noise which

designed

may be affected

noise

or

high

its

scanning

of other

by

environment

operates

in an

radiates from power

ignition systems,

to minimize

interference

under conditions

may be

signals

sensitiuity.

whenever a

or

Whenever

very
desired signals, the
means

its individual

of

from

received by

such

channel

busy

affected

panel

of

switch.

00 0000 00

t23.1

5878

[il[[[[00

Remove

by

stal

aligning the pins with
down. DO NOT BEND
TURE
WILL

crystals

CRYSTAL FORMULAS

SOCKETS

BREAK OFF

NOTE: Do not

Rigid
by Electra Company
warranty does

from

The

"H"

150mHz to

frequencies

New

'(L'r

"H"

-

crystal by a

the

ARE N,IADE

IF

BENT

install

two crystals

qualiry'

"U/T"

Received
Example:

Received frequency

Example:

standards are applied to crystals furnished

to assure full performance.

not include

other

sources.

alignment

l7[mHz,

may be

frequency

35.80

155.01 mHz

mHz

pull

gentle

the

upward.

sockets and pushing

THE SOCKETS.

OF SPRING

EXCESSIVELY.

of the

correcting

spread is 450mHz

and the

added within

+

10.80

-

3

poor operation caused

"L"

these

mHz = crystal frequency

+

f0.80 mHz

10.80 mHz

-

10.80 mHz

=

=

crystal

3

Insert

the cry-

straight

THESE \'IINIA-

BRONZE

same

therefore our

to ll2mH.z,

33m[z

spreads.

46.600fi) mHz

frequency

=

48.07000

AND

frequency.

to ABmHz.

by

the

ln cases of strong
desirable to
pickup
medium

reduce

below a

and

strong signal

-Single-channel operation

under Operating

with

ing

will

"\IANUAL-SCAN"

the

all but

out

alwavs be

the

on that channel

Continuous-carrier

interfering noise

length of the antenna to

the

critical level.

This

or signals

may be very

areas.

may

be obtained as

Instructions. It may

in either

switch

also

be
position

desired channel. This assures that the

signals

even when

as

such

turned

ESSA weather broad-

the

casls on 162.55mH2, which are available in many areas,

be received when desired by use of

swi

tches.

In mobile
tion conditions

systems,
setting of the

Shen

power

squelch

moring

service the

are signal

lines

or shipping

antenna to avoid damage

commonly encountered

fading, nearhy faulty ignition

proximity

and

control

will minimize these conditions.

the radio, remove

it or to the internal circuit assem-

to

individual channel

the

to strong signals.

the

blies.

RADIO

Locd Govemment
Highway Maintenance
Forestry-Conserration
Motion
Special
Telephone Maintenance
Automotile Emergency Power
Public
Mobile Telephones Forest Products

SERVICES

Pictures

Indusbial

Mobile

Radio

Emergency Police

Specid

-Hospitds

-Ambulances

-Physicians

-Disaster

-School

Peholeum

Relief

Busses Taxicab

Fire
Press
Business
Railroad

Marine
Manufachrers
Motor
Rural Radio

-4-

it may be

noise

reduce

effective

in

described

accomplished

lock-

by

radio

OFF and ON.

may

poor recep-

Careful

telescoping

Carrier