IFR FM/AM-1200A

IFR FM/AM-1200A

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jNOTE\

Automatic

switching

to

external

source

occurs

when

an

external

10

MHz

reference

frequency

of

+5

dB,

or

greater,

is

applied

at

External

Reference

Connector.

DO

NOT

EXCEED

~

WATT

INPUT.

3-3

KEYBOARD

AND

VFD

DESCRIPTION

RF

0

+/-

ENTER

I

II

11-11-11

11-1

ocs

A

Figure

3-4

Keyboard and

VFD

Layout

The

FM/AM-12005/A Keyboard and

VFD

(Vacuum

Fluorescent

Display)

provides

a means

of

entering

data

into

the

microprocessor

to

control

the

various

operating

parameters

of

the

RF

frequency,

tone

generator

and

duplex

generator

offset

frequency.

Normal Keyboard

operation

involves

the

following

three

basic

types

of

key

entry

sequences:

A.

"DIRECT"

MODE

Key-entrTes-allow

simultaneous

programming

and

execution.

B.

PROGRAM

MODE

PROG-Key-entries

allow

retrieval,

edit

and

storage

without

the

execution.

C.

EXECUTE

MODE

EXEC-Key-entries

allow

retrieval

and

automatic

execution

without

erlit

capability.

The

primary

objective

of

this

subsection

is

to

familiarize

the

operator

with

the

methods

of

making

keyboard

entries.

A

complete

description

of

the

Keyboard and

VFD

operation

is

located

in

Section

4.

3-12

05

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