IFR FM/AM-1200A

IFR FM/AM-1200A

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4-7-7

SELECTING

''DUPLEX

HIGH''

OR

''DUPLEX

LOW''

{FM/AM-1200S

ONLY)

STEP

PROCEDURE

------------------------------------------------------------------------

1.

Place

MODE

Selector

Control

(39)

to

''DUP''

position.

2.

Press

2ND

-

FUNCT

1•1

to

select

DUPLEX

HIGH

(-15

dBm

±10

dB)

or

OPT

a.

The

VFD

will

display:

or

b.

The

word

"ON"

following

one

of

these

selections

will

indicate

the

presently

selected

DUPLEX

operating

mode.

the

[;r

0

1

~

and

l-c'

I

3.

Use

~

""'"'

to

rotate

between

the

two modes as

4.

displayed

on

the

VFD.

Press

~

to

change

from

the

current

operating

mode

to

the

one

displayed

on

the

VFD.

The

word ''ON''

will

appear

on

that

display.

If

no

key

is

pressed

within

5

seconds

after

the

"DUPLEX

HIGH''

or

''DUPLEX

LOW''

message

appears

on

•

the

VFD,

the

FM/AM-1200S

will

default

to

its

;

last

setting

and

VFD

display.

;

4-7-8

DUPLEX

TESTING

METHODS

(FM/AM-1200S

ONLY)

Three

possible

methods

of

UUT

Duplex

Testing

using

the

FM/AM-1200S

are:

A.

DUPLEX

TESTING

USING

SEPARATE

TRANSMIT/RECEIVE

LINES

(FULL

DUPLEX

OPERATION)

4-43a

05

In

this

mode,

the

UUT

transmitter

output

is

applied

to

the

FM/AM-1200S

at

the

T/R

Connector

(11).

The

FM/AM-1200S

offset

generator

output

(available

at

the

DUPLEX

Output

Connector

(14)),

at

a

fixed

level,

is

applied

to

the

RF

input

of

the

UUT

receiver.

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