IFR FM/AM-1200A

IFR FM/AM-1200A

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The FM/AM-1200S/A

receiver

is

a

triple

conversion,

superheterodyne

receiver,

capa~le

of

monitoring

communication

signals

within

a

range

of

250

kHz

to

999.9999

MHz,

in

100

Hz

steps.

Signals

may

be

received

''off-the-air''

using

an

external

antenna

or

by

direct

cable

connection

through

the

front

panel

T/R

Connector.

Associaterl

receiver

monitoring

circuits

include

a

frequency

error

meter,

modulation

meter,

power

meter,

SINAD

meter,

signal

strength

meter,

frequency

error

and

demodulaterl

audio

counters,

oscilloscope

and

spectrum

analyzer

(FM/AM-1200S

only).

1-3

FM/

AM-1200

S/

A

CAPABILITIES

A

prime

feature

of

the

FM/AM-1200S/A

is

the

capability

of

testing

both

simplex

and

rluplex

communication

equipment.

Simplex

operation

is

defined

as

any

equipment

that

communicates

in

only

one

direction

at

a

time

on

the

same

frequency,

including

ordinary

transmit-receive

or

press-to-talk

operation,

voice

operated

carrier

anrl

other

forms

of

manual

or

automatic

switching

from

transmit

to

receive.

Duplex

opera-

tion

is

characteristic

of

any

equipment

which

transmits

on

one

frequency

anrl

receives

on

another

frequency

between

two

locations,

such

as

mobile

telephone

systems

and

repeaters.

In

receive

mode,

the

FM/AM-12005/A

receiver

monitors

incoming

signals

received

"off-the-air"

or

applied

via

rlirect

cable

connection

through

the

front

panel

T/R

Connector.

In

this

mode,

the

FM/AM-12005/A

signal

generator

is

inactive.

In

the

generate

mode,

the

FM/AM-12005/A

is

capable

of

generating

modulaterl

or

unmodulated

carrier

signals

while

the

receiver

circuits

are

simultaneously

monitoring

the

generator.

In

the

duplex

mode,

the

FM/AM-12005/A

has

the

capability

of

generating

and

receiving

signals

simultaneously.

While

the

receiver

section

of

the

FM/AM-12005/A

is

monitoring

incoming

signals

transmitted

by

the

UUT,

the

FM/AM-12005/A

duplex

generator

is

simultaneously

generating

signals

to

stimulate

the

receiver

section

of

the

UUT.

The

frequency

of

the

generated

signal

from

the

FM/AM-12005/A

can

be

offset

up

to

±49.99

MHz

from

the

receiving

frequency

in

10

kHz

steps.

Three

methods

of

duplex

testing

are

available

using

the

FM/AM-12005/A. They

are:

Duplex

Testing

using

separate

Transmit/Receive

Lines

Duplex

Testing

using

one

common

Transmit/Receive

Line

"Off-the-air"

Duplex

testing

The

methods

of

duplex

testing

are

described

in

detail

in

Section

4.

1-2

05

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