Ramsey Electronics COM 3 User Manual

Ramsey Electronics COM 3

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5).

Touch

the

DEVIATION

key,

and

two

red

lights

will

light,

one

on

each

side

of

the

(1.5KHz)

bargraph

display.

Turn

on

the

transmitter,

mute

the

microphone

so

no

voice

or

background

noise

is

transmitted.

The

bargraph

display

should

be

indicating

+1

KHz.

of

CTS

tone

deviation.

NOTE

Typical

CTS

tones

have

a

deviation

of

0.6

KHz,

therefore,

we

should

adjust

the

deviation

for

a

reading

of

0.6

KHz.deviation.

Four

LEDs

on

each

side

of

the

center

LED

should

be

lit,

indicating

that

0.6

KHz

of

CTS

deviation

is

seen.

44.4

TRANSMITTER

DEVEATION

MEASUREMENT

.

1)

Connect

the

whip

antenna

to

the

RF

INPUT

jack.

2)

Enter

in

464.15,

then

touch

the

MONITOR

FM

key.

3)

Connect

the

tranceiver

to

be

tested

to

an

antenna

or

dummy

load.

(DO

NOT

under

any

circumstances

connect

a

transmitter

to

the

RF

INPUT

of

the

Com3,

serious

damage

will

result.)

4)

Touch

the

DEVIATION

key,

and

two

red

lights

will

light,

one

on

each

side

of

the

(£1.5KHz)

bargraph

display.

Key

the

transmitter,

mute

the

microphone

so

no

voice

or

background

noise

is

transmitted.

Four

LEDs

on

each

side

of

the

center

LED

should

be

lit,

indicating

that

0.6KHz.

of

CTS

tone

deviation

is

seen.

5)

|

Touch

the

DEVIATION

key,

and

two

red

lights

will

light,

one

on

each

side

of

the

(+7.0KHz)

bargraph

display.

Voice

test

the

transmitter,

all

ten

LEDs

on

each

side

of

the

center

LED

should

light

up

with

voice,

indicating

(+7.0

KHz)

of

deviation.

NOTE

`

it

is

important

to

adjust

the

CTS

tone

deviation

first,

before

adjusting

the

voice

deviation.Since

the

CTS

tone

will

be

added

to

the

voice

and

will

increase

it's

overall

deviation.

6)

Perform

the

voice

test

again

and

adust

the

transmitter

for

(+5.0

KHz)

deviation.

Six

LEDs

on

each

side

of

the

center

should

light

indicating

a

total

deviation

of

(+5.0

KHz)

including

CTS

tones.

4.5

20

dB

QUIETING

MEASUREMENT

This

test

allows

you

to

measure

the

sensitivity

of

a

receiver.

|

i

1)

Connect

an

AC

voltmeter

to

the

speaker

terminals

of

the

transceiver.

2)

Open

the

transceiver's

squelch

and

adjust

the

volume

control

for

a

nominal

reading

on

the

AC

voltmeter

(for

this

example;

1

volt).

3)

Connect

a

cable

between

the

tranceiver's

antenna

input

and

the

Com

3's

RF

OUTPUT.

4)

Enter

in

469.15,

then

touch

the

GENERATE

RF,the

FM,

and

1

KHz

keys.

The

red

light

should

be

"on"

next

to

the

GENERATE

RF

and

FM

keys,

and

"off"

nextto

the

1

KHz

key.

5)

Select

the

X1

range

on

the

attenuator

by

touching

the

LEVEL

UP

or

LEVEL

DOWN

keys

until

the

red

light

next

to

the

X1

is

lit.

(

the

output

range

is

now

0.1

to

1.0

pV).

6)

Increase

the

output

level

until

the

AC

voltmeter

reading

drops

20

dB,

or

to

0.1

volts.

The

setting

of

the

MICROVOLTS

knob

will

be

the

20

dB

quieting

measurement.

NOTE

If

the

receiver

is

not

sensitive,

you

may

have

to

change

the

attenuation

scale

to

the

next

higher

range.

Touch

the

X10

key

and

repeat

step

(6)

until

0.1

volts

is

read

on

the

AC

voltmeter

(

the

output

range

is

now

1.0

to

10.0

pv).Keep

going

up

until

20

dB

of

quieting

is

achieved.

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Ramsey Electronics COM 3 Specifications

General

Brand	Ramsey Electronics
Model	COM 3
Category	Monitor
Language	English

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