Midland 77-250CXL User manual

77-250CXL

OWNER’S

MANUAL

40-channe!

mobile

citizens

band

transceiver.

Contents

Midland

77-250CXL

features__^-

5-6

Installation

instructions

Accessories

included

Location

selection

Mechanical

mounting

Power

wiring

Microphone

hanger

Optional

remote

speaker

Optional

Publjc

Address

Speaker

Antennas

_:_

Selection

(minimum

requirements)

Effect

location

performance

Installation

Tuning

Operating

instructions

_________

Operating

controls,

connectors

12-13

Functions

and

uses

12-13

General

information_

Channel

usage

10-Code

usage

Channel

frequency

chart_

Range

ESP2

™

noise

reduction

Noise

----

Trouble-shooting

aids

Noise

suppression

Common

problems

and

solutions

(chart)

___________

Technical

specifications

Written

specifications

Service

and

Warranty

information

Midland

77-250CXL

40-channel

mobile

transceiver.

Features:

State-of-the-art

techniques

have

been

used

the

electronics

your

new

Midland

CB.

Including

Midland

Power

performance

—with

transmitter

rated

for

legal

maximum

4-watt

output

power

with

high

level

modulation

accordance

with

FCC

Part

95.

Plus

highly

sensitive,

selective

dualconversion

superheterodyne

receiver

with

tuned

stage,

ceramic

filters

and

built

in,

automatic

noise

limiter-certified

FCC

Part

requirements.

Outside,

it’s

designed

give

you

the

most

convenient

operation

possible.

other

design

aspect

has

been

given

attention

than

the

time

and

motion

-saving

features

built

into

your

new

radio,

microphone

and

mounting

system.

You’ll

find

and

enjoy

the

benefits

this

attention

detail

all

across

the

control

panel.

For

example:

•

New

large-scale,

easy-reading

LED

40-channei

indicator.

•

Volume

control.

•

Full-range,

variable

squelch

control.

•

Variable

mic

gain

control.

•

True

Analog

Signal/Power/Modulation/SWR

Meter.

•

SWR-CAL-S/RF

meter

switch.

•

gain

control.

•

SWR

calibrate

control.

•

Front-mounted,

screw

deluxe

microphone.

•

CB-PA

switch

permits

use

public

address

amplifier.

•

ANL

(Automatic

Noise

Limiter)

“Off”

switch.

Noise

blanker

switch

and

ESP2

™

dynamic

noise

filter

switch.

•

Brite-Dim

switch.

•

Jacks

for

external

speaker

and

speaker.

•

Precision

PLL

(Phase

Locked

Loop)

tuner.

•

“Omni-Power”

operation

13.8-volt

DC,

positive

negative

ground.

•

Fresh,

attractive

styling

with

mounting

bracket

and

retention

knobs

for

easy

stallation

and

removal

for

security.

•

CH9-OFf^-CH19

Instantly

selects

CH9

CH19.

Mic

gain

control

ON-OFF

switch

CH9-OFF-CH19

switch

ESP

ON-OFF

switch

S/RF-SWR-CAL

Meter

switch

BRITE-DIM

switch

SRF/SWR

meter

LED

display

Channel

rotary

switch

gain

control

SWR

control

Squelch

control

OFF/VOLUME

control

ANL-OFF-PA

siwtch

Midland

77-250CXL

Mobile

operating

controls.

How

install

your

Midland

mobile

CB.

This

transceiver

may

installed

any

12-volt

negative

positive

ground-

system

car

truck.

Most

current

U.S.

and

foreign

vehicles

use

negative

system,

but

some

older

models

and

some

newer

large

trucks

may

have

positive

ground.

Check

the

requirements

for

your

vehicle

before

you

begin

installation.

Generally,

you

have

negative-ground

system

the

minus

(

—)

battery

terminal

connected

the

motor

block.

Contact

your

dealer

the

event

you

are

unable

determine

your

vehicle’s

polarity

system.

Installation

and

operating

accessories

furnished

with

your

Midland

Mobile

CB:

Easy-removal

mounting

bracket

system.

Microphone

bracket

system.

All

main-unit

and

microphone

mounting

hardware

needed

for

normal

installation.

Plug-in

microphone

with

coil

cord.

Owner’s

Manual.

Where

locate

your

transceiver.

Your

new

Midland

designed

installed

under

the

dash

your

vehicle.

Safety

and

convenience

are

the

primary

considerations

deciding

exactly

where

locate

your

radio.

Caution:

sure

that

the

unit

locatec

that

does

not

interfere

with

the

driver

impair

access

any

controls.

Connecting

cables

must

routed

and

secured

such

manner

not

interfere

with

the

operation

the

brake,

accelerator

other

controls.

Interference

from

either

the

unit

connecting

cables

may

contribute

the

loss

control

the

vehicle.

Also

sure

the

installation

does

not

interfere

with

airbag

operation.

Mechanical

mounting.

Step

Heeding

the

caution,

use

the

mounting

bracket

template

for

marking

the

location

screwholes

under

your

dash.

Use

awl,

nail

other

sharp,

pointed

object

mark

the

metal.

Step

Drill

1/8”

hole

for

each

screwhole

the

mounting

bracket.

Attach

the

bracket

the

dash

with

the

3/8”

Phillips

machine

screws

provided.

Extreme

care

should

‘exercised

when

drilling

into

dash

avoid

damage

under-dash

electronic

ignition,

cruise

control,

instrument

airbag,

and/or

accessory

wiring.

Step

Locate

and

secure

the

radio

into

the

mounting

bracket

allowing

working

space

for

later

power

connections.

Power

wiring.

Step

you

have

not

determined

whether

your

vehicle

has

negative

positive

ground,

now.

Then

disconnect

the

leads

from

the

battery

prevent

short

circuits

that

can

occur

during

wiring.

Step

With

negative

ground,

connect

the

red

wire

—

the

one

with

in-line

fuse

holder

—

either

the

(a)

fuse

block,

(b)

cigarette

lighter

(c)

directly

the

positive

post

your

battery.

(Usually,

the

fuse

block

the

most

convenient

connecting

point.

also

possible

connect

the

Accessory

terminal

the

ignition

switch,

that

your

automatically

goes

off

when

the

ignition

goes

off,

preventing

accidental

battery

drainage.)

Then

tightly

connect

the

black

wire

directly

the

vehicle’s

metal

frame.

With

positive

ground,

reverse

the

wires,

connecting

the

red/fuse-holder

wire

the

frame,

the

black

wire

your

power

source.

light

meter

can

good

aid

locating

suitable

power

source

and

ground.

either

case,

good,

direct

metal-to-

metal

ground

essential

for

optimum

performance.

Step

Plug-in

the

power

cord

the

receptacle

provided

the

back

the

transceiver.

CAR'S

MOTOR

BLOCK

FIRE

WALL

GROUND

SOLENOID

EXAMPLE

NEC.

GROUND

12-V

CAR

BAIT

CONNECTION

ILLUSTRATION

MOST

CARS

TRUCKS

ARE

THIS

TYPE

POSITIVE

SOLENOID

POS.

GROUND

12-V

CAR

BATT

CONNECTION

ILLUSTRATION

FEW

18-WHEELERS

OLDER

CARS

Mounting

the

main

unit.

Step

Position

the

main

unit

Step

Tighten

the

retention

knob^

between

the

bracket

arms

line

with

the

retention

knobs.

Set

the

angle

for

optimum

operating

comfort

and

accessibility.

Installation

microphone

hanger.

Mounting

holes

are

provided

the

side

the

transceiver

for

the

microphone

hanger

bracket.

Alternately,

the

bracket

can

attached

the

vehicle

dash.

Connecting

optional

remote

speaker.

Locate

the

“EXT”

jack

the

main

unit

rear

panel.

Firmly

insert

and

seat

the

speaker

wire

plug

into

the

jack.

When

connected,

the

external

speaker

will

override

and

“blank

out”

the

in-unit

speaker

standard

with

your

Midland

Mobile

CB.

Connecting

optional

Public

Address

speaker.

Locate

the

“PA”

jack

the

main

unit

back

panel.

Firmly

insert

and

seat

the

speaker

wire

plug

into

the

jack.

Directions

for

mounting

the

optional

speaker

are

included

along

with

mounting

hardware,

with

the

speaker.

Antennas:

How

select,

position,

install

and

tune

the

right

one

for

you.

Basically,

you

have

two

types

mobile

antennas

—

full-length

whip

and

loaded

whip

—

and

variety

types

mounts

(depending

where

you

locate

your

antenna)

choose

from.

Midland

markets

broad

line

high-performance

antennas.

The

dealer

who

sold

you

your

Midland

can

advise

which

type

best

for

you.

Essentially,

you

have

five

location

choices:

the

roof,

gutter,

rear

deck,

front

cowl

rear

bumper.

Where

you

decide

locate

your

antenna

will

determine

the

type

antenna

you

install.

Again,

consult

your

Midland

Dealer

for

advice

and

guidance,

and

measure

your

needs

against

the

attributes

the

various

Midland

antenna

models

carries.

Where

you

locate

your

antenna

does

make

difference.

Some

general

rules

for

antenna

location

that

can

aid

performance:

Put

your

mount

high

the

vehicle

possible.

The

higher

the

proportion

antenna

length

that

above

the

roof,

the

better.

possible,

mount

the

antenna

the

center

whatever

surface

you

choose.

Keep

antenna

cables

away

from

noise

sources,

such

the

ignition

system,

gauges,

etc.

Make

sure

you

have

solid

metal-

to-metal

ground.

Exercise

care

prevent

cable

damage.

Antenna

installation.

the

manufacturer’s

installation

instructions

carefully.

Warning:

Never

operate

your

radio

without

attaching

antenna

with

broken

antenna

cable.

This

can

result

damage

transmitter

circuitry.

Tuning

your

antenna.

Some

antennas

are

factory

tuned.

However,

performance

can

usually

improved

slightly

lengthening

shortening

its

length,

using

Standing

Wave

Ratio

(SWR)

meter.

For

the

exact

procedures

used,

refer

the

antenna

manufacturer's

installation

manual.

You

can

buy

SWR

meter

separately

have

your

antenna

checked

your

Midland

Dealer’s

service

department.

Midland

77-250CXL

Operating

Instructions

Having

properly

installed

and

wired

your

and

antenna,

you

are

now

ready

for

the

ten

steps

designed

get

you

into

effective,

satisfactory

operation:

Step

Insert

the

plug

from

the

microphone

into

the

mircrophone

jack

the

face

panel

and

screw

securely.

Step

Make

sure

your

antenna

securely

connected

the

antenna

connector.

Step

3:-

Make

sure

the

Squelch

control

the

o'clock

position.

SQUELCH

Step

Make

sure

the

Mic

gain

control

fully

clockwise,

rvilC.GAlN

Step

Turn

the

power

and

adjust

the

"Volume”

control

for

satisfactory

sound

level,

volume

fully

clockwise.

RF—.GA!I\J

Step

Make

sure

the

ANL/OFF/PA

switch

the

“OFF”

“ANL”

positio

ANL

Step

Put

CH19-OFF-CH9

switch

"OFF”

position.

CH-'IS

CH--9

OFF

Step

Select

your

desired

channel

turning

the

Channel

Selector

dial

below

the

LED

digital

indicator

clockwise

(up)

counter-clockwise

(down).

Step

10:

Place

SRF/SWRICAL

switch

“S-RF”

position.

SRF

CAL

Step

11:

transmit,

press

the

push-to-

talk

bar

the

microphone.

receive,

release

the

bar.

Operating

controls,

connectors:

Their

functions

and

uses.

Starting

the

upper

left

(driver's

side)

your

Midland

77-250CXL

and

moving

counter-clockwise:

Electronic

S/RF/SWR/Modulation

Meter.

This

new

high

visibility,

meter

used

four

ways.

(1)

When

receiving,

gives

tfre

relative

strength

incoming

signals.

(2)

When

transmitting,

shows

(Radio

Frequency)

power

output.

(3)

“SWR”

meter,

helps

match

your

antenna

installation

your

transceiver.

(4)

When

transmitting

the

scale

will

peak

with

indicating

modulation

levels.

[I]

Microphone

Connector.

Securely

links

your

microphone

the

main

unit,

during

use,

yet

allows

quick

disconnection

when

out

service.

OffAfolume

Control.

Turns

your

and

adjusts

the

sound

level

for

comfortable

reception.

[C]

Squelch

Control.

Turned

clockwise,

quiets

the

receiver

when

signals

are

not

being

received

and

allows

quiet

standby

operation.

The

Squelch

control

functions

only

the

receive

mode

and

does

not

affect

receiver

volume

when

signals

are

being

received.

adjust,

when

signals

are

present,

rotate

the

Squelch

control

clockwise

until

the

receiver

quieted.

Incoming

signals

will

automatically

release

the

squelch

action.

Careful

adjustment

necessary

setting

too

far

clockwise

will

not

allow

weaker

signals

release

the

squelch

action.

Mic

(Microphone)

Gain

Control.

Adjusts

the

sensitivity

the

microphone

amplifier

circuit

suit

individual

voice

characteristics

and

ambient

noise

conditions

provide

maximum

intelligibility.

Rotating

the

control

counter-clockwise

reduces

the

sensitivity

and

requires

“close

talking”

into

the

microphone.

VVhen

operating

from

noisy

vehicle,

reducing

the

Mic

Gain

setting

will

usually

improve

your

transmitted

voice

clarity.

Check

with

other

operators

determine

the

exact

setting

best

for

your

voice

and

car.

Gain

Control.

Controls

the

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