SEA 222 - Dimming the Display

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2.4

PROPAGATION

2.5

2.5.1

2.5.2

2.5.3

2.5.4

Hf

signals

do

propagate

far

beyond

the

horizon.

MF

frequencies

(2-3

MHz)

are

generally

usable

within

300

miles

depending

on

the

time

of

day,

atmospheric

conditions

and

man-made

noise

level.··

The

High

Seas

frequencies

(4,

6,

8,

12,

16,

and

22

MHz)

allow

conmu-

nications

over

thousands

of

miles,

again

subject

to

the

above mentioned

limitations.

Interference

tends

to

be

more

of

a problem

than

on

VHF.

OPERATING

YOUR

SEA

222

HF/SSB

RADIOTELEPHONE

DESCRIPTION

OF

MEMORY

FUNCTIONS

The

SEA

has

TWO

memory

banks.

First,

the

factory

progranmed

frequency

"mask" which

contains

290

frequency

PAIRS,

stored

and

recalled

by

CHANNEL

NUMBER.

Second,

the

internal

11

scratchpad

11

memory

with

al

lows

the

operator

to

program

and

recall

100

frequency

pairs.

See

~

3.4

for

ITU

channel

listing.

(NOTE:

10

of

the

100

field

progranunable channels

are

"EMERGENCY"

channels.)

PUTTING

THE

SEA

222

IN

THE

OPERATING

MODE

Turn

the

Volume

ON/OFF

knob

CLOCKWISE

until

the

radio

is

activated.

When

the

display

indicates

"2182.0",

the

radiotelephone

has

properly

initialized

and

is

set

up

to

operate

on

2182.0

KHz

in

the

A3H

mode.

Wait 3

minutes

for

the

synthesizer

frequency

to

stabilize

and

the

SEA

222

is

ready

to

operate

on

2182.0

KHz.

DIMMING

THE

DISPLAY

Enter

any

desired

SINGLE

digit

number,

followed

by

the

"ENT"

conmand.

The

single

digit

command

will

be

interpreted

by

the

operating

system

as

a

level

of

intensity

with

0

being

display

OFF

and

9 being

maximum

display

brightness.

Note

that

when

the

di

sp

1

ay

is

extinguished,

the

first

stroke

on

ANY

key

will

restore

the

display

to

maximum

brightness.

TURNING

THE

AUDIO

FEEDBACK

OFF/ON

To

turn

off

the

beep,

enter

any even

digit

and

the

"ENT"

keypad.

Example:

Press

"6",

then

"ENT".

To

turn

the

beep back

on

enter

any

odd

di!:jit

and

the

"ENT" keypad. Example: Press

11

6

11

,

then

"ENT".

Note:

this

modification

only

affects

SEA

222's

with

serial

numbers

higher

than

X2724.

SELECTING

A

FREQUENCY

FROM

SCRATCHPAO

MEMORY

Enter

any

desired

TWO

aigit

nun1ber,

followed

by

the

"ENT"

command.

The

two

di

yi

t

command

wi

11

be

interpreted

by

the

operating

system

as

6

I

~··