IFR FM/AM-1200A

IFR FM/AM-1200A

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l

!

5-10-8

TWO

TONE

SIGNALING

FORMAT

OPERATION

This

format

allows

the

setting

of

two

tone

frequencies,

duration

times

for

these

frequencies

and a

GAP

time

between

the

generation

of

these

two

tones.

The

programming

screen

used

to

set

these

parameters

is

con-

figured

as:

The

The

segments

of

this

programming

screen

and

their

ranges

are:

Two-Tone

Format

Tone # (1

or

2)

Tone

Frequency

(300-3400

Hz)

Tone

Duration

(20

mS-

9999

mS)

-~-'..,Iandi~

keys

are

used

to

moved

the

cursor

between

the

segments

of

~~~

!---·

r ,

~

the

screen

and

the

number keys

or

the

arrow

keys

are

used

to

enter

the

required

digits.

After

the

Tone

#1

frequency

and

duration

is

entered,

a

screen

will

appear

on

the

VFD

which

allows

the

entry

of

the

GAP

time,

or

interval

between

Tone

#1

and Tone

#2.

As

an

example,

use

the

following

steps

to

program

a

Two

Tone

format

with

an

800

Hz

tone

of

1

second

duration

for

Tone

#1,

a 750

mS

GAP

time

and a 600

Hz

tone

of

2

seconds

duration

for

Tone

#2:

STEP

1.

5-14

05

PROCEDURE

The

VFD

indicates:

r.;=lllslr==;=/

I

E::::;=-,1

:;==;:I

I

=;=ls:::;=;l

lr==r=sl

'::::;==,

le:y::=:;:lslr=;=,l

:::;=;1

l==nllll

(Or

other

format,

depending

on

last

tone

format

programmed)

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