Motorola R-2200, R-2400 Operator's Manual

@

Communications
Service Monitor

MOTOROLA

test equipment

INC.

OPERATORS'

R-2200/R-2400

MANUAL

,_____

.

68P81069A

79-8

MOTOROLA TEST EQUIPMENT PRODUCTS

LIMITED

(EXCLUDES

WARRANTY

EXPORT SHIPMENTS)

Motorola
Department are warranted by Motorola for a period

This express warranty
Motorola, at its
during the period
tion prepaid.
Transportation

This warranty

In

In the event Motorola elects to repair a defective product by replacing a module
module
remain
PRESS
TY,

Test Equipment Products (herein the

is

extended to the original purchaser only. In the event

option,

will either repair,

of

warranty, and the defective product

Proof

of

purchase

charges for the return

is

void, as determined

(a) The product has not been operated

(b)

The

seals

on

non-user serviceable components

(c)

The

product has been subject to misuse, abuse, damage, accident, negligence, repair

no

event shall Motorola be liable for any special, incidental,

or

subassembly with a new

in

force on the replacement module

OR

ARE

EXCLUDED.

IMPLIED,

INCLUDING

and

evidence
of

the product

in

the reasonable judgement

or

reconditioned replacement module

ANY

"product")

of

or

replace the product providing that Motorola receives written notice specifying the nature

of

date

to

in

accordance with the procedures described

or

subassembly.

IMPLIED

that are manufactured

one

(I)

year from date

is

returned to Motorola at

of

shipment (packing list

Purchaser shall be prepaid by Motorola.

of

Motorola, if:

or

modules

WARRANTY

are

or

consequential damages.

EXCEPT

of

broken;

or

subassembly. Only the unexpired warranty

AS

SPECIFICALLY

OF

FITNESS FOR A

or

shipment against defects

of

or

or

distributed by Motorola Communications

a defect, malfunction, or failure during the period

1313

East Algonquin Road, Schaumburg, IL 60196 transporta-

invoice) must accompany the return

in

the operating instruction;

subassembly, Motorola, at its option, may replace such defective

PARTICULAR

or

alteration.

SET

FORTH

in

material

HEREIN.

PURPOSE

and

SUPPORT SERVICES

For service on your Motorola test equipment in the U.S. contact the Test Equipment Service Center, Schaumburg,

Schaumburg, lllinois 60196

1-312-576-7025. Outside the U.S. contact your nearest Motorola representative.

or

call the Test Equipment Service Hotline: [phone] during normal business hours.

Group

workmanship.

of

the defective product.

of

the warranty product

ALL WARRANTIES EX-

OR MERCHANTABILI-

1313

E.

Algonquin Rd.,

In

Parts

of

warranty,

of

the defect

EPS-30828-0

Illinois call

will

MODULE EXCHANGE PROGRAM

Modular construction

delivery. Outside the U.S. contact your nearest Motorola representative.

The Motorola products described in this
grams stored in
for

Motorola certain exclusive rights
reproduce in any form the copyrighted
grams contained in the

any manner

shall
copyrights, patents
use that arises by operation

of

not

be deemed

the

R2001

semiconductor

without

the express written permission

or

allows field replacement

COMPUTER SOFTWARE COPYRIGHTS

memories

for

copyrighted

computer

Motorola

to
patent

products described in this

grant either

directly

applications

of

law in the sale

of

individual assemblies. Contact the Test Equipment Service Center for pricing and

instruction

or

other

manual may include copyrighted Motorola

media. Laws in the United States and other countries preserve

computer

program. Accordingly, any copyrighted Motorola

of

Motorola. Furthermore, the purchase of Motorola products

or

by implication, estoppel, or otherwise, any license under the

of Motorola, except for the normal non-exclusive, royalty free license

of

a product.

programs, including the exclusive right

instruction

manual may

not

be copied or reproduced in

computer

to

copy

computer

EPS-34440-B

v

pro-

or

pro-

to

Specifications

~,Motorola,

•

Printed in U.S.A. • © 1985 Motorola

subject

Private-Line, and Digital Private-Line are trademarks

to change

without

notice.

Inc.

of

Motorola, Inc.

®

MOTOROLA

Communications
Sector

INC.

R-2200/R-2400 Communications
Service Monitor

M

on

/5'-/.2'-

/0DMHz

CJ

1111

1111

ANAl

-~

~

GJ

VlEA

~

•33KHz

G

DJ~J"iJ

EJEJ@JlB00000

'I

OS~llOSCO:E

SP~CTAUM

\. t

.

~

I.

MO~•T

1111

-u

I , U

r;

OA

s-,.,

KHz

GJ

0

MODUlATION

~

<>Motorola, Inc. 1985
All Rights Reserved

Printed in

U.S.A.

68P81069A

I

9/15185

79-B

PHI

®

MOTOROLA

INC.

TABLE

Paragraph
Forward
Section I

1.1.0 General

1.2.0 Specifications
Section 2 - Description

2.1.0 Description

2.2.0 Microprocessor Technology

2.3.0 Multiple Functions

2.4.0 Portability

2.5.0 Durability

2.6.0

2.7.0

2.8.0

2.9.0 Distortion Meter

2.1 0.0 Terminated

2.11.0 Off-The-Air Monitor

2.12.0 Off-The-Air Private Line Frequency Counter

2.13.0 Multipurpose Oscilloscope

2.14.0 Multimode Code Synthesizer

2.15.0 Simultaneous Modulation

2.16.0

2.17.0 Spectrum Analyzer

2.18.0 Two-Way Service Option

OF

CONTENTS

......................................................................

- Introduction

..............................................................

.........................................................

...........................................................

.............................................

....................................................

...........................................................

............................................................

Human
AM/FM
SINAD

Digital/

Engineering

Signal Generator

Metering

RF

Analog Voltmeter

...................................................

......................................................

......................................................

Power Measurement

..................................................

....................................................

..............................................

.....................................

..............................................

............................................

..............................................

..............................................

...............................................

..............................

Page

v

1-2
1-2

2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-2
2-2
2-2
2-2
2-2
2-2
2-2
2-2

Section

3.1.0 Introduction

3.2.0 General

3.3.0 Liquid Crystal Display

3.4.0 Programming Sequence

3 - Operation

...........................................................

3 .1.1 Switches

3 .2.1 Power
3 .2.2 Mode Select Switch

3.2.3 Function Switch

3.2.3.1 Generate Functions

3.2.3.2

3.3.1 Liquid Crystal Displays

3.3.1.1 Analog Meter

3.3 .1.2 Special Display Select Switches

3 .4.1 Generator

3.4.1.1 Frequency Copying
3 .4.1.2 Frequency Stepping

3.4.2 Deviation Limit

3.4.3

Tone

3.4.3.1

3.4.3.2

3.4.3.3 Singletone A

3.4.3.4 Singletone B

3.4.3.5

And

Indicators

...............................................................

Turn

On

......................................................

..................................

......................................................

Monitor

Data
PL
DPL,

AlB

Functions

And

Monitor Frequency

...........................................................

.............................................................

IDPL

Tone

And

................................................

Mode

Bars/Digital

.................................................

......................................................

......................................................

.....................................................

.....................................................

Voice

...............................................

...............................................

Select

...............................................

...............................................

...............................................

.............................................

.......................................

Displays

.................................

......................................

......................................

,

................

3-1
3-1
3-1
3-1
3-1
3-2
3-2
3-2
3-2
3-2
3-2
3-2
3-3
3-3
3-4
3-4
3-4
3-5
3-5
3-5
3-5
3-6
3-6

II

3.4.3.6

3.4.3.7 Tone Remote

3 .4.4 Cancelling Entries

3.5.0 RFSection

3.5.1 RF

3.5.2 Antenna

3.5.3 StepAttenuator

3.5.4 RF Vernier

3.5.5 Generator

3.5.6

3.6.0 Oscilloscope/Modulation Scope
3 .6.1 Intensity Control

3.6.2 Focus Control

3.6.3 Horizontal Control

3.6.4 Horizontal Vernier Control
3 .6.5 Source Switch

3.6.6 Vertical Display Control
3 .6. 7 Vertical Display Vernier

A/B

Variable

....................................................

....................................................

....................................................

............................................................

In/Out

Connector

...........................................................

.....................................................

.........................................................

On/Off

AttenuatorNotZero

....................................................

......................................................

.......................................................

................................................

..................................................

.................................................

..........................................

..................................................

...........................................

..............................................

..............................................

3.6.8 Vertical And Horizontal Position Controls

3.6.9 Triggering Mode Control

3.

6.10 Triggering Level Control

3.6.11 Multi-Purpose Input

3.

7.0 Monitor Section

........................................................

3.7.1 Volume/Squelch Control

3.7.2 Image

Hi/Lo

Control

3. 7.3 Bandwidth Control-

3.7.4 Demodulator Output

3.8.0 Modulation Section

3.8.1 General

3.8.2

One Kilohertz Generator Level Control

.............................................................

.....................................................

3.8.3 External Modulation Input Connector

3.8.4 Microphone Connector

.............................................

.............................................

.................................................

..............................................

.................................................

Wide/Narrow

......................................

.................................................

..................................

...................................

................................................

3.8.5 External Modulation Source Level Control

3.8.6 Code Synthesizer Level Control.

3.

8. 7 Modulation Switch

...................................................

3.8.8 Code Synthesizer Mode Selection

3.9.0

Rear Panel Controls

....................................................

3.9.1 Battery /External DC Power Source

3.9.2 External Power Connector

3.9.3 AC Power Source Fuseholder

3.9.4 DC Power Source Fuseholder

........................................

.......................................

.....................................

.............................................

..........................................

..........................................

3.10.0 Two-Way Service Option Operating System

3.10.1

3.10.2 DTMF Decode

3.10.3 DTMF Encode

DPL/IDPL

3.10.1.1

3.10.1.2

DPLDecode
IDPLDecode

Decode

.................................................

....................................................

...................................................

......................................................

3.10.2.1 Batch DTMF Decode

.............................................

......................................................

3.10.3.1 Real Time DTMF Encode

3.10.3.2 DTMF Batch

Encoder-

.........................................

No

PL

...................................

3.10.3.3 User Defined Timing DTMF Batch Encode
PL

3.10.3.4

3.10.3.5

Frequency Select

Simul

PL

and DTMF Batch Encode

.............................................

..............................

...............................

...............................

..........................

................................

3-6
3-6
3-7
3-7
3-7
3-7
3-7
3-7
3-7
3-7
3-8
3-8
3-8
3-8
3-8
3-8
3-8
3-8
3-8
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-9
3-10
3-10
3-10
3-10
3-10
3-11
3-11
3-11
3-11
3-11
3-12
3-12
3-12
3-12
3-12
3-12
3-13
3-13
3-13
3-14
3-14
3-14

-

Section 4 - Operating Instructions

4.1.0 Operation

4.2.0 Power Up

.............................................................

.............................................................

4-1
4-1

III

4.2.1 Parameter Memory

4.2.2 Default Parameters

4.3.0 Generate Operation

4.3.1

Output Level

4.3.2 Mode Select

.........................................................

4.3.3 Simultaneous Generate And Measurement

4.3.4 Testing

Pager Decode And Alert Function

4.4.0 Monitor Operation

4.4.1 Sensitive Monitor

4.4.1.1 Sens Mon With Spectrum Analyzer (R-2400 only)

4.4.2 Power Monitor

4.4.2.1

Pwr

Mon With Spectrum Analyzer (R-2400 only)

4.4.3 Transmitter Distortion Measurements

4.4.4 Measurement

4.4.5 Simultaneous

..................................................

..................................................

....................................................

........................................................

Operation

...............................

.....................................................

....................................................

......................................................

...................................

Of

Transmitted

Oscilloscope I DVM Operation

PL

.......................................

.............................

......................

......................

......................

Section 5 - Applications

5

.1.0 Service Shop Setups

5.1.1 Spectrum Analyzer

....................................................

...................................................

5.1.2 Operating Notes For The R-2400 Service Monitor With Spectrum Analyzer

5.2.0 Receiver Sensitivity Test

5.3.0 Receiver Sensitivity Test 20 dB Quieting

5.4.0 Squelch Sensitivity Test

5.5.0 Audio Power Output Test

5.6.0 Audio Frequency Response

5. 7.0 Modulation Acceptance Bandwidth

5.8 .0 RF Preselector Shape And Bandwidth

5.9.0 Receiver Frequency Adjustment

5.10.0 Basic FM Transmitter Test: Power, Frequency And Deviation
5 .11.0 Transmitter Audio Distortion

5.12.0 Transmitter Audio Frequency Response

5.13.0

AMModulationTest

5.14.0 Cavity And Duplexer Tuning Bandpass Adjustment

12

dB SINAD Audio Distortion

...................................

................................................

..............................................

.............................................

......................................

....................................

.........................................

...........................................

...................................

..................................................

........................

....................

................

5.15 .0 Cavity And Duplexer Tuning Bandpass With Reject Notch - Receive Leg

5.16.0 Cavity And Duplexer Tuning Bandpass With Reject
.0 Desensitization Test In Service Duplexer

5.17

..................................

Notch-

Transmit Leg

....

.......

......

.4-1
.4-1
.4-1

4-1
4-2
4-2

.4-2

4-3
4-3
4-3
4-3
4-4
4-4
4-4
4-4

5-1
5-1
5-1
5-2
5-2
5-2
5-3
5-3
5-4
5-4
5-4
5-5
5-7
5-7
5-7
5-8
5-8
5-9
5-9

Section 6 - Maintenance

6.1.0 Battery Kit Installation

6 .1.1 Battery Charging

6.1.2 Operation From

6.1.3 Shipping Instructions

..................................................

.....................................................

An

External DC Power Source

.................................................

6.1.4 Two-Way Service Option Installation

...........................

....................................

6-1

6-1

6-1

6-2
6-2

IV

FOREWORD

1. SCOPEOFMANUAL

This manual
technicians with similar types
all the service information required for the equipment
described
which occur after the printing date are incorporated by
Instruction Manual Revisions (SMR). These SMR's are
added to the manuals as the engineering changes are in­corporated into the equipment.

and

is

intended for use by experienc€;d

is current as

of

equipment.

of

the printing date. Changes

It

contains

2. MODEL AND KIT IDENTIFICATION

Motorola equipments are specifically identified by

an

overall model number
cases, assemblies
also have kit model numbers stamped

production

applicable schematic diagrams are updated.

As diagrams are updated, information
change
sion column appears in the manual next to the parts list
or,

number,
removed

is

incorporated into a revision column. This revi-

in some cases,

part

or

and

or

engineering change is incorporated, the

on

number,

replaced.

on

the nameplate. In most

kits which make

the diagram.

and

It

description

up

the equipment

on

them. When a

about

lists the reference

of

the

the parts

the original supplier under the direction
Test Equipment Repair Center. Out-of-warranty service
is

performed
petitive rates. Customer satisfaction
surveyed by reply cards returned with repaired in­struments.

The Motorola Test Equipment Repair Center also
provides a convenient telephone troubleshooting ser­vice. Frequently, a user technician can troubleshoot a
piece

of
under the direction
Repair Center via telephone. Required replacement
parts are then immediately shipped
reducing shipping time
telephone troublehsooting contact the Motorola Test
Equipment Repair Center toll free

All other inquires
calibration
Motorola Area
Motorola Test Equipment Repair Center, process the
necessary paperwork
contact you to expedite the

on

equipment

and

Parts

a time

repairs should be directed

and

materials basis at com-

and

isolate the defective components

of

the Motorola Test Equipment

and

and

requests for test equipment

Office. They will contact the

and,

if

necessary, have the Center

repair~

of

the Motorola

is

continually

to

the user thereby

servicing costs. For

at

[phone].

to

the

4. REPLACEMENT PARTS ORDERING

3. SERVICE

The Motorola Test Equipment Repair Center

charged with the service responsibility for all test equip-

ment supplied by the Motorola Communications Sec­tor. The center maintains a stock
replacement parts and a complete library
formation for all Motorola test equipment.

Most in-warranty repairs are performed
center. Exceptions include repairs
not manufactured by Motorola which are performed by

of

original equipment

of

service in-

on

some equipment

at

the

is

Motorola maintains a number
strategically located throughout the United States.
These facilities are staffed
tify

part

numbers,

maintenance

products.

Orders for all replacement parts should be sent
the nearest area parts
When ordering replacement parts the complete iden­tification number located
included.

and

repair

to

process parts orders, iden-

and

otherwise assist in the

of

Motorola Communications

and

service center listed below.

on

the equipment should be

of

parts offices

to

v

68P81062E66-0

5. ADDRESSES

5.1 GENERAL OFFICES

MOTOROLA

Communications and

Electronics Inc.

Communications & Electronics Parts

1313

E. Algonquin Rd.,

Schaumburg, Illinois

Phone: [phone]

5.2 U.S. ORDERS

60196

PACIFIC

P.O.
San
Phone:
TWX: 910-335-1516

GULF

1140 Cypress Station
P.O.
Houston, Texas
Phone: [phone]
TWX:

SOUTHWESTERN

Box 85036

Diego, California 92138

714-578-8030

STATES

Box 73115

910-881~6392

AREA

77090

PARTS

AREA

PARTS

WESTERN

1170 Chess Drive, Foster City

San Mateo, California 94404

Phone: [phone]

TWX: 910-375-3877

MIDWEST

1313

E. Algonquin Rd
Schaumburg, Ill.
Phone: [phone]
TWX:

MID-ATLANTIC

7230 Parkway Drive
Hanover, Maryland
Phone: [phone]

TWX: 710-862-1941

EASTCENTRALAREA

12995 Snow Road
Parma,
Phone: [phone]

TWX: 810-421-8845

EASTERN

85

Harristown Road
Glenrock, New Jersey
Phone: [phone]
TWX:

AREA

AREA

910-693-0869

PARTS

60196

AREA

Ohio 44130

AREA

710-988-5602

PARTS

PARTS

PARTS

20176

PARTS

07452

SOUTHWESTERN

P.O.

Box 34290

3320

Belt Line Road
Dallas, Texas 75234
Phone: [phone]
TWX:

910-860-5505

SOUTHEASTERN

P.O.

Box

368
Decatur, Georgia 30031
Phone: [phone]

TWX:

5.3

CANADIAN ORDERS

810-766-0876

MOTOROLA

National Parts Department
3125

Steeles Avenue East
Willowdale,
Phone: [phone]
TWX:
Telex: 06-526258

5.4 ALL COUNTRIES EXCEPT U.S. AND CANADA

Ontario

610-491-1032

MOTOROLA,

International
1313

E. Algonquin Road
Schaumburg, Illinois
Phone: [phone]
TWX:
Telex: 722443
Cable:

Parts

910-693-0869
MOTOL

LTD.

INC.

PARTS

AREA

AREA

M2H 2H6

Dept.

PARTS

PARTS

60196 U.S.A.

ROCKY MOUNTAIN

20 Inverness Place E.
Englewood,
Phone: [phone]
TWX: 910-935-0785

68P81062E66-0

CO 80112

AREA

PARTS

VI

MOTOROLA TEST EQUIPMENT PRODUCTS

AUTHORIZED

Motorola C & E

Test Equipment Service Center-East

1313

E. Algonquin
Schaumburg, IL 60196
1-800-323-6967

1-312-576-7025 (Illinois Only)
MAMS:
TTY: 910-693-0869

Motorola C & E, Inc.

Hawaii Service
99-1180 lwaena Street
Aiea,

1-808-487-0033
TTY: 63212

Motorola Australia Pty.

Test Equipment Service
666

Mulgrave, VIC
Melbourne
Phone: [phone]
Telex: 32516

Cable:

MAMS:

Motorola GmbH

F and V ABT. Frachtzentrum
6000 Frankfurt Main/Flughafen

West Germany

Attn:

Phone: [phone]
Telex: (0) 4182761

NAGOU

HI

96701

Wellington Road

MOTOCOM

FEMEL

METEC

Parts

Road

Center

Ltd.

Center

3170

MOTOCOMA

MELBOURNE

MOT

D

AA

FZF

WARRANTY SERVICE CENTERS

Motorola S.A.

Test Equipment Service Center

14,

Allee du Cantal
91020 Evry Cedex
Phone: (6)
Telex: .600434F
MAMS:

Motorola Cauda, Ltd.

Test Equipment Service Center

3420 Pharmacy A venue
Unit
Scarborough, Ontario MIW 2P7
Phone: [phone]

TTY: 610-492-2713

MAMS: NAWIL

Motorola South Africa (Pty.) Ltd.

Motorola House
5th

Street
P.O.
Wynberg
Phone: [phone]
Telex.;
CABLE:MOTOROLAJOHANNESBURG
MAMS:

Test

2333B. Utah Avenue

Segundo, CA

El

1-213-536-0784

077.790.25

FAFEV

11

Box 39586

422-070 SA

FESAF

Equipment

CE

1455

MOTEV

Service Center-West

90245

VII

~

~

c

worldwide support of
communications systems

MOTOROLA

Communications

Sector

INC.

SAFE HANDLING

OF

CMOS

INTEGRATED CIRCUIT DEVICES

Many

of

the integrated circuit devices used in com­munications equipment are
tary Metal
high open circuit impedance,
to damage from static charges. Care must be taken in
handling, shipping,
assemblies in which they are used.

CMOS IC inputs, the protection is effective only against
overvoltage in the hundreds
encountered in
elements distribute static charges and load the
circuits, decreasing the chance

Oxide Semiconductor) type. Because

Even though protection devices are provided in

an

operating system. In a system, circuit

of

the CMOS (Complemen-

CMOS ICs are vulnerable

and

servicing them

of

volts range such as are

of

damage. However,

of

and

CMOS

their

the

CMOS circuits can be damaged by improper handling

of

the modules even in a system.

To

avoid damage

handling, shipping,

1.

Prior

to
particularly after moving within the service area,
momentarily touch
grounded surface. This will discharge any static charge
which may have accumulated
servicing.

to

circuits, observe the following

and

servicing precautions.

and while servicing a circuit module,

both hands

to

a bare metal earth

on

the person doing the

2. Whenever possible, avoid touching any elec­trically conductive parts
hands.

3.

Normally, circuit modules can be inserted
removed with power applied
check the

tions
diagram
tice.

carpeted areas, dry environments,
clothing (silk, nylon, etc.) because they contribute
static buildup.

be grounded.
equipment to the circuit module

INSTALLATION and MAINTENANCE sec-

of

the manual as well as the module schematic

to

insure there are no objections

4. When servicing a circuit module, avoid

5.

All electrically powered test equipment should

Apply

of

the circuit module with your

to

the unit. However,

to

this prac-

and

certain types

the ground lead from the test

before connecting the

test probe. Similarly, disconnect the test probe prior

removing the ground lead.

6.

If

a circuit module is removed from the system,
it is desirable
sheet

of

through 1

to

lay it

on

a conductive surface (such as a

aluminum foil) which is connected

OOk

of

resistance.

to

ground

or

of
to

to

NOTE
Wearing
(Motorola No. RSX-4015A) will minimize
static buildup during servicing.

When wearing Conductive Wrist
be

~areful

The good ground provided by the wrist
strap will also increase the danger
lethal shock from accidentially touching
high voltage sources.

©Motorola, Inc.

All Rights Reserved
Printed in

U.S.A.

Conductive

WARNING

near sources

1982

of

techni<§AI

Wrist

high voltage.

Strap

Strap,

1301

E.

Algonquin Road,

of

7.

grounded.

8.
components,
necessary in the replacement
device), be sure
described in procedure
exist across the
ly one hand be used
CMOS device

wliUng

Schaumburg,

WARNING

If

the aluminum foil

to

ground, be cautious

trical shock from contacting the foil

same time as other electrical circuits.

When soldering, be sure the soldering iron

Prior

to

connecting jumpers, replacing circuit

or

touching CMOS pins (if this becomes

to

human

if

and

associated

:~e~vica~

II.

60196

is

connected directly

of

possible elec-

at

the

of

an

integrated circuit

discharge any static buildup as

1.

Since voltage differences

body, it is recommended

it is necessary

board

to

touch pins

wiring.

68P81106E84-C

12/10/82- PHI

that

on

is

can

on-

the

9.

When
device, leave
ductive
cuit module.

pulse generators, etc.) should be connected

foam

10. All low impedance test equipment (such as

replacing a

the

device in its metal rail container

until it is

CMOS

to

be inserted

integrated circuit

into

the

printed cir-

to

or

con-

CMOS

device inputs
cuitry. Similarly, such low impedance equipment should
be disconnected before power

11. Replacement modules shipped separately from

the

factory will be packaged in a conductive material.

Any

modules being
another
(aluminum foil

CONDUCTIVE
modules.

after

should be

may

MATERIAL

power is applied

is

turned

transported

wrapped

be used).

in a simlar material

NEVER

for packaging these

to

off.

from

the

CMOS

one

area

USE NON-

cir-

to

2

A

SECTION I

Figure 1-l. Communications Service Monitor

1-1

SECTION!

SPECIFICATIONS

1.1.0 GENERAL This section lists the physical, electrical
and input/output characteristics of the Communications
Service Monitor shown in figure 1-1.

1.2.0 SPECIFICATIONS

Modes: AM/FM Generate, Monitor Power Monitor,

Voltmeter DC,
Load, Oscilloscope

Signal Generator Mode

FREQUENCY

Range:

Resolution:

Accuracy: Same as

OUTPUT

(16

dB

in

10 dB steps over 8

Frequency Range:

AMPLITUDE MODULATION

Fre~uency

variable

ranges)

Range:

Accuracy:

PURITY

Spurious:

Harmonics:

FREQUENCY

MODULATION

Deviation: 0

FM Noise:

External/Internal

Modes:

xternal

Range: 0
Range:,

Input:

Modes:

External/Internal

200kHz
100Hz

.05uV

to

40uV to 1V (high level output)

±2

dB over the

± 2 dB leveling over the

freq. range ± 3 dB leveling over the

999.9999
operating temperature range

-40

dB

-15

dB (step attenuator = 0 dB, 0 dBm out)

to

50

100Hz
5Hz

to

External, internal

to

50% from 1

100Hz-10kHz(±
Approx.
Internal, external, microphone
simultaneously

Monitor Mode

Frequency Range:

Resolution:

Accuracy: Same as

Frequen~

In icator:

Sensitivity:

(Over the 3 MHz

999.9999 MHz range)
Spurious Response:

FM

DEVIATION

MEASUREMENT

AM

MODULATION MEASUREMENT

RF

Frequency Fhnge: 1 MHz to 1000 MHz

Range:

Accuracy:

Range:

Ace

!;I

WATTMETER

LOAD

AND

Power Range:

Accuracy:

Protection: over temp. and over power alarms

3 MHz to 999.9999 MHz useable
with

reduced sensitivity.

100Hz

Error

Digital Display of frequency error and bar graph

1.5

uV for 10

to

KHz mod. acceptance)
5 uV for
SINAD (wideband ± 100 kHz mod. acceptance)
5 uV for

-40

dB

0

dB

image ±

-10

dB

1,

10,

100kHz

±

5%

of

deviation, ±

0

to

100%

±5%

racy:

of

.5

watt to 125 watt

±10%

RMS, AC, RF Wattmeter and

to

999.9999 MHz

time

base

800uV (low level output)

.1

uV to

1V

range of output level

200

kHz to

MHz frequency range ± 1

kHz peak

10kHz

150mV for

Typical

at

or

microphone (any or all)

to

500 MHz

1 dB)

50%

BNC connector

time

base

dB

EIA SINAD (narrowband ± 7

10

dB

EIA

10

dB

EIA SINAD AM

21

.4

MHz

L.O.

harmonic ± 10.7 MHz

full scale

reading ± 100

10% of reading

full scale

Hz,

500 Hz

ref.

50

or

kHz

750
750

dB

25° C

all

to

100 KHz

to

MHz
MHz

over the

50

to

75

kHz

kHz

to

General

OSCILLOSCOPE

Freq. Response:

EXTERNAL

DIGITAL VOLTMETER

AC Bandwidt :

CODE SYNTHESIZER &

Frequency Range:

Special Function:

Input level range:

(1

kHz using code

synthesizer for tone)

Input Level Range:

Standard TCXO:
Optional OCXO:

Size:

2.5

in diagonal

DC

to

.5

MHz

VERTICAL

INPUT

Ranges: 1us,

Sweep Rates: division

Sync: Automatic or adjustable level triggering

Readout: 3 digit Autoranging

DC

Accuracy: ±

AC

Accurac~:

AUDIO GEN.

Resolution:

Accuracy:

Output

Level:
Meter

SINAD

Accuracy: ± 1

Distortion:

Range:

Accuracy

PL Counter

Range:

Resolution:

TIME BASE

10

mV,

100

10us, 100us, 1ms, 10ms, 100ms per

1%

F.S.

±5%

50

50 Hz

0.1
±.01%

PL,
variable, tone remote
0

to

.5 V to

0

to
.5
5%

60

0.1

Aging ± 1 x

+55

Aging ± 1 x

+ LSD

F.S.

Hz to

10kHz

to

9.999 kHz

Hz

50

to

DPL, DPL invert, 2 tone sequential, 2 tone

3 RMS @ 600 Ohms

10

VRMS

dB @ 12

35

dB

V to 10 VRMS

of

F.S.

from

to

270Hz

Hz

c

Power and Environmental

AC: 90

Optional Battery:

Battery Weight: 8 lbs.

Temp. Range:

DC:

Dimensions:

Weight:

to

130,

+ 11.0
12
operation

0

7Vz"

(19.0
30

180

to + 17

V battery provides approx. 1 hr. continuous

(3.63

kg)

to

+55

C
high x 12'/z" wide x 14" deep
em x 31.8 em x

lb. excluding battery pack

R-2400 Spectrum Analyzer

Dispersions:

Dynamic Range:

Measurement Range:

Display Range: Level: 6 divisions

Dynamic Range: Noise desensitization:

Audio

Monitoring: Simultaneous Monitor function with spectrum

1,

.1,

.01

MHz/div

55

dB

min.

-100

dbm
using internal
Accuracy:
below
Useable
uncalibrated)

Frequency: 8 divisions
dispersions of

dispersion and
1 MHz/div. dispersion and 1 MHz offset.

analyzer display

to + 27

+/-5

800 MHz);

to

+51

(3

dB

point)

mV, 1

V,

10 V per division

1,

10,

100,

1000Hz, 1 Hz

dB

SINAD

1%

to

50%

10-6

Yr Temp. ± 1 x

10-6

Yr Temp. ± 5 x

to

250 V ac,

V de

35.6

em)

dbm

at

RF

db

dbm at

1,

25

of

Antenna connector

step attenuator

absolute (at frequencies

+/-2

db linearity.

RF

at

10

db

per division

with

.1,

and

.01

-55

KHz freq. offset;

received signal.

300

volts full scale

1000Hz

to

9999Hz

10-6

from 0

10-6

max.

50/60Hz

(13.6

kg)

In/Out conn. (level

switch

selectable

MHz per division

dbc

at

.01

MHz/div.

-70

dbc

to

at

1-2

SECTION2

DESCRIPTION

2.1.0 DESCRIPTION
The R-2200 and R-2400 are test instruments designed

and manufactured by Motorola to perform the most
commonly used tests
ment. Rugged and portable, the Communications Serv­ice

Monitors are designed for technician productivity.

2.2.0

2.3.0 MULTIPLE

2.4.0 PORTABILITY

2.5.0

MICROPROCESSOR TECHNOLOGY

The R-2200 and R-2400 Communications Service Moni­tors use advanced engineering design based upon a
Motorola
ture liquid crystal displays (LCD) and a sealed mem­brane keyboard for easy and accurate entry
LCD's show exactly what displays and functions are ac­tive at any time. The displays change as you switch
monitor functions, and prevent you from selecting an
invalid readout.

The microprocessor design permits a wide variety of
service applications. The
ing tests which require:

Modulation Oscilloscope
"Off-the-Air" PL Counter
Multimode Code Synthesizer

ACIDC

General Purpose Oscilloscope
SINAD
Distortion Meter
RF

as well as the traditional service monitor functions
SIGNAL GENERATION, FREQUENCY ERROR and
MODULATION measurements. In addition, the
R-2400 provides a spectrum analyzer display while
simultaneously monitoring the received signal.

Weighing under
engineered for ease
battery allows 1 hour continuous operation. Time
saved since the technician has to transport less equip­ment and does not have to take time to unpack, hook-up,
disconnect and repack additional equipment.

The R-2200 and R-2400 are field environment tough and
meet the shock and vibration portions
tion RS152B. The units have been subjected to acceler­ated life testing, during the design stage, to ensure the
best possible design and reliability. The Mylar covered
keyboard

M-6800 series microprocessor. The units fea-

Digital Analog Voltmeter
Meter

Wattmeter

DURABILITY

is

sealed against moisture, dirt, dust and oil.

on

radio communications equip-

of

data. The

FUNCTIONS

R-2200

30 lbs. (13.6 kg), the unit's form factor

of

carrying. The optional internal

is

capable

of

of

EIA

perform-

specifica-

2.6.0 HUMAN ENGINEERING
The

R-2200 and R-2400 are human engineered. The

membrane keyboard with audible feedback ensures ac-

curate data entry. Front panel controls are grouped by

function for simple operation. The microprocessor con­trolled LCDs provide autoranging analog and digital

displays.

2.7.0 AM/FM
The built-in general purpose signal generator provides

continuous coverage

mobile spectrum for receiver testing. Many forms
external and internal modulation can be simultaneously
impressed on the carrier signal for actual composite sig-

nals. The frequency range
from 200KHz to 1

to 1 VRMS provides sufficient amplitude to get through

misaligned tuners and receivers and

tive when changing a receiver's frequency. The high
level, calibrated
quency range

2.8.0

SINAD METERING

A comprehensive check

made with a

bars and digital display
whenever that measurement mode
is

simple with
measurements can then be accomplished without the
need for a separate signal generator, SINAD meter

of

is
is

distortion analyzer.

2.9.0 DISTORTION METER
The

distortion
audio stage quality measurement without a separate sig­nal generator
resolution than an oscilloscope to ensure the radio under
test meets all distortion specifications.

2.10.0 TERMINATED RF POWER MEASUREMENT
RF

power
vice Monitor
RF

load dissipates up to
transmitter should be keyed into the unit
power transmitter
time threatening overheating
circuitry, the audible alarm sounds and the LCD's dis­play changes to read
TEMP",
strument

of

tion

modulation, all at the same time.

SIGNAL GENERATOR

of

the HF,

GHz

in 100Hz steps. The output of up

output

of

the Communications Service Monitor.

SINAD

only

meter

or

distortion meter.

is

measured when the Communications Ser-

is

in the power monitor mode. The built-in

thus warning the technician to de-key. The in-

is

further enhanced by the simultaneous indica-

RF

power output, carrier frequency error and

is

available over the entire fre-

of

measurement. The analog meter

of

SIN

two

provides receiver

125

is

keyed into the unit for a prolonged

"OVER

VHF,

of

the

RF

signal generator

is

especially effec-

receiver performance can be

AD

appear automatically

is

selected. Hook-up

connections

It

also provides higher

watts.

If

a higher powered

of

the power measuring

POWER"

and

UHF

required

or

transmitter

or

if a lower

or

·"OVER

land

of

is

and

or

L

2-1

2.11.0 OFF-THE-AIR MONITOR
The

1.5

microvolt sensitivity
Service Monitor receiver allows off-the-air monitoring
and measurement
deviation to 1000 MHz. A variable squelch allows weak
signals to be monitored, but can be set tighter to ensure
the

proper

cy.

The off-the-air monitor function enables frequent
parameter
system
down. Bandwidth can be set
signal location
maximum sensitivity and selectivity.

2.12.0
COUNTER

Identifies the PL frequency

allow complete testing

2.13.0 MULTIPURPOSE OSCILLOSCOPE
This general purpose scope

in

two-way communication servicing. Use it for viewing
modulation signals (either internally
ated). detection
tortion. and general purpose signal tracing and trou­bleshooting.

2.14.0 MULTIMODE CODE SYNTHESIZER
The Communications Service Monitor generates PRI-

VATE
codes
tone-remote signalling tones. All codes are available at
the

"MOD
modulate the
necessity
general servicing, setting transmitter deviation,
checking

2.15.0 SIMULTANEOUS MODULATION
Modulation is simultaneously available from an internal

I KHz tone
and from external inputs. The external modulation can
be voice from a standard Motorola mobile radio micro­phone (which plugs into the front panel

ment), as well as a signal applied to the external BNC
input. Separate controls are provided for independently

setting the levels

and the external modulation
tone
SIN
vides external access to all

2.16.0 DIGITAL/ANALOG VOLTMETER
The

service capability.

signal-to-noise ratio for measurement accura­checks without leaving the shop, thus spotting

degradation

OFF-THE-AIR

LINE

(DPL),

OUT"

of

using separate generators and oscillators for

tone

is

a convenient source

AD

measurements. A

built-in voltmeter provides circuit and power supply

of

transmitter frequency

early

or

wide band FM;

PRIVATE

of

of

asymmetric modulation

tones

(PL),

two-tone sequential paging codes and

jack, as well as being used internally to

RF

signal generator. This eliminates the

remote base control lines.

generator, a multimode

of

the I KHz

AC

voltage reading are RMS values.

of

the

Communications

error

and

keeping service costs

"WIDE"

of

any radio under test to

PL subaudible tone signalling.

is

ideal for waveform analysis

DIGITAL

tone, the code synthesizer,

sourc~s.

of

modulation for making

"MOD

of

the modulation signals.

for off-channel

or

"NARROW"

LINE

FREQUENCY

or

externally gener-

or

PRIVATE

code

synthesizer,

of

The

OUT"

connector pro-

audio dis-

the instru-

I KHz test

and

for

LINE

or

for

2.17.0

2.18.0

SPECTRUM

The R-2400 includes a spectrum analyzer which pro­vides frequency spectrum display while allowing the
user

to

monitor the audio
signal. Three dispersions
available.
used. The range
attenuator is in the 0 dB position
graticule)
are
the step attenuator, the range
becomes +
not exceed the maximum input level
dBm)
RF
sampled
tenuation
justed with the step attenuator.

SERVICE
The TWO-WAY SERVICE

series
compatible with any R-2200 (or R-2400) via
option module slot
following functions:

Some
cludes OFF-THE-AIR decoding
codes. The Two-Way Service Option will decode only
valid
With the
R-2400), the service technician has a "failsafe opera­tion"
performing a complete

The option card also provides multiple methods in which
to encode DTMF tones. The most basic form
DTMF, a real time encoder, is one selection possible. There
are also encoding formats available for operator selection
which include:
user programmable timing, and 3) simultaneous PL and
DTMF encode.

A last function
In this mode the service monitor will decode DTMF tones
OFF-THE-AIR or via the modulation input BNC connec­tor. This option will decode and store

With
Decode built-in, the R-2210
tions Service Monitors qualify as a complete signalling
simulator, capable
system check
mon

In

to

10

dB each. When

27

at

the

signal

that

and

to

THE

FIRST

OPTION

of

new option cards. This

TWO-WAY SERVICE

of

the

DPL

codes

DPL

making it easier

DPL,

DTMF

signalling formats.

ANALYZER

of

the programmed frequency

of

I,

.1,

and

.01

MHz/div

"Anlzr Sens Mon", the "Antenna"

of

power levels displayed when the step

is

-40

-100 dBm (noise floor). Vertical divisions
70

dB attenuation

of

power levels displayed

dBm

to

-30

dBm. Care must be taken

Antenna

displayed. The required

maintain

major

1)

of

on

input. In "Anlzr

is

applied to the

an

on-screen display can be ad-

IN A SERIES/TWO-WAY

and

DPL

DECODE
DTMF
DTMF

encoder, standard in every R-2200 (or

I6 digit storage (BATCH ENCODE), 2)

the Two-Way Option is DTMF Decode.

the land mobile industries most com-

ENCODE

DECODE

features

and

will not display invalid codes.

and

DPL

and

the standard

of

performing a complete signalling

"RF

OPTION

comes equipped with the

of

the

less time consuming when

system check.

and

R-2410 Communica-

is

of

Pwr

In/Out"

amount

is

PC

board, plug in

OPTION

DPL

of

DPL

up

to I6 DTMF digits.

PL

port

dBm (top

added using

.5

watt ( +

Mon", the

port

of

the first in a

an

Decoder in-

or

of

generating

Encode

are

is

to

27

is

at-

open

IDPL

and

2-2

SECTION3

OPERATION

3.1.0 INTRODUCTION

To

become
ment
monitor. carefully study
switch and indi
with

3.1.1 SWITCH

See

assemblies, controls and indicators

service monitor.

3.2.0

The
cian's universal tool. It
tain most
and
ability
was designed
the service monitor, (figure

crystal displays which will provide the digital
readout
left

wa~eforms

lt

can
routine
functions as a

keypad is used

ton

operator
discussed in
grouped by function

proficient, an

and

its capabilities. Before

cator

the

operating

AND

figures 1,

GENERAL

service

needs

and

s for

is a modulation oscilloscope

also

is

actuated

2,3,4,5,6,7,

monitor

AM,

FM

to

provide accurate measurements, have

offer

fast, efficient use. This service

to

meet all these criteria. A

any

received

be

used as a general

trouble

shooting

spectrum

for

an

the

entry has been accepted. Operation is

paragraph

operator

the

purpose

described

procedures

here

INDICATORS

and

is

the

radio

is

required

and

CW

two-way

3-l),

mode

of

operation

or

generated

purpose

procedures.

analyzer. A sealed

all

data

entry. Each time a

audible feedback

3.4.0. Specific controls

and

outlined with red graphics

must know the equip-

operating

and

and become familiar

given.

8 for

on

communication techni-

to

reveals two liquid

to

display modulation

by

the service

the

service

function

the
the

service

radio

selected.

oscilloscope for

In

the

tone

of

location

front

and

equipment

monitor

front

view

and

analog

To

monitor.

R-2400, it

membrane

pushbut-

will tell

of

main-

reduce

in detail later.

In/Out

each

of

the

SCOPE
purpose
meter
the

frequency dispersion

is

Next

controls for

MULTIMODE

technician
PL,DPL
such as a

3.2.1 POWER

The

power

In

th e full down position, "

The

dur-

of

the

center
circuits
standard.
and

maintains stability
especially
position , '·ON", all circuits

3.2.2 MODE SWITCH

The

mode
which selects
ated.

The "FM

the

are

to

generate
tion allows
and

the "AM"

modulated

operator

controls is

controls
input

and

the

, timed signalling

except

This

frequency

confusion. Each section will be covered

The

RF

SECTION

at

the

bottom

are

to

the

right

used for

oscilloscope vertical inputs.

MONITOR

off

the

CODE

to

modulate

microphone

on/

off

switch is a

position. ''STBY

for

allows

important

select switch

the

type

''

position allows

the

unit

position gen

signals.

SINAD,

is

controlled by this section.

section with speaker

air monitoring

SYNTHESIZER

an

formats,

or

audio generator.

three

OFF

", removes

the

battery

battery

of

the

for high stability units. In

are

is a three

of

signal

modulated

to

generate

erates

with

RF

carrier

left.

The

OSCILLO-

and

include the multi-

distortion, digital volt

In

the

R-2400,

and

squelch

and

on

the

right, a

to

allow

the

RF

carrier signal with
and

external sources

positio~

",

the

charger

charging when not in use

crystal oscillator.

powe red .

position toggle switch

to

be

the

signals.

unmodulated

or

t?ggle switch.

umt

IS

turned

power

and

frequency

monitored

unit

The "CW". posi-

monitors

or

to

monitor

RF

amplitude

off.

from all

This

the

up

gener-

or

s1gnals

is

FIGURE

1111 1111

•33~tH~

3-1-CLOSEUP

3-1

FRONT VIEW

..

.

3.2.3 FUNCTION SWITCH

3.2.3.1 GENERATE FUNCTIONS The function switch

is

four position rotary switch which permits the service

as

an

RF

monitor to be used

200

from

kHz to 999.9999 MHz or an

specified from 1 MHz to 999.999 MHz. In the

signal generator specified

RF

signal monitor

"HI

GEN"

(high generate) function the unit generates and outputs

RF

signal and

an
on any frequency within the specified range. The
output level

is

capable of

is

sufficient for transmission through an

200

u V to 1 VRMS output

1 volt

antenna connected to the antenna connector. In the
"GEN"

(generate) function the unit generates an

RF

signal for direct connection to the antenna input of the

.1

equipment under service with output levels from

u V to

200 uV.

3.2.3.2 MONITOR FUNCTIONS The "SENS MON"

(sensitive monitor) function allows the unit to monitor
low level signals. The
the air monitoring

of

microvolt sensitivity allows

a remote transmitter's frequency

off

1.5

error and deviation/OJo modulation (of modulated car-

is

riers). Hookup
Selecting the

made to the "ANTENNA" connector.

"PWR MON" (power monitor) function
permits the service monitor to operate as an RF watt­meter, allowing direct output power measurement
transmitters within the range

of

.5

to

125

watts. Fre-

of

quency error and deviation/OJo modulation measure­ments are also available in the

is

Hookup

made to the "RF

"PWR MON" function.

IN/OUT"

connector. The

R-2400 has two additional function switch positions,

"Anlzr Sens Mon" and "Anlzr Pwr Mon" which are used

of

to enter the analyzer mode
Mon", the signal applied to the "Antenna" input

operation. In "Anlzr Sens

is

displayed. In "Anlzr Pwr Mon", the signal applied to

"RF

the

In/Out"

are the same as for

input

is

displayed. All other functions

"Pwr Mon" and "Sens Mon".

3.3.0 LIQUID CRYSTAL DISPLAY MODE SELECT

Notice the cursor controls

jl:::t.j

on the left and right

LCD's. These controls select the various measurement
modes. Each time the cursor control

DOT

annunciator

will

screen

move and an audible feedback tone will verify

actuation. The equipment

located on the left side of each LCD

is

programmed to suppress

is

depressed the

measurement modes not relevant to the selected service

in

the

monitor function. For example, when

"GENER­ATE" function, frequency error and power (on the right
LCD) cannot be accessed. This reduces operation time
and increases productivity. See table

1 for software de-

fined selections.

3.3.1 LIQUID CRYSTAL DISPLAYS

3.3.1.1 ANALOG METER BARS/DIGITAL DISPLAYS

As shown in fig. 3-2 the LCD's provide autoranging
analog and digital displays. Digital displays provide
accuracy and autoranging meter bars assist during peak­ing and dipping maintenance adjustments. To provide
efficient operation the digital readouts of selected modes

MODE

ALARM

AM

VOLTAGE

ALARM

AM

ERROR

VOLTAGE

ALARM

AM

ERROR

VOLTAGE

3-1

MEA-

SUPPRESSED
SUREMENT

FREQ

ERROR

POWER

RF

LEVEL

POWER
RF

LEVEL

TABLE

FUNCTION

a

SWITCH
GENERATE

HI

POWER
OR
ANALYZER
POWER
MONITOR

SENSITIVE

MONITOR
OR
ANALYZER
SENSITIVE
MONITOR

POSITION

GENERATE

MONITOR

ACCEPTABLE

SUREMENT

DEVIATION
DEV/%
DVM
DISTORTION
SINAD
BATTERY
RF

LEVEL

DEVIATION
DEV/%
DVM
DISTORTION
POWER
FREQ
BATTERY
SINAD

DEVIATION
DEV/%
DVM
DISTORTION
FREO
BATTERY
SINAD

are presented at the same time as analog displays. With

RF

display modes selected for

signal measurements such

as FM deviation or frequency error, the meter bars oper-

ate about a center point and show symmetrical or non-

or

symmetrical deviation
quency. In

"%AM",

drifting about the center fre-

the meter bar graph operates about

a center point and shows positive and negative percent-

Other

age of amplitude modulation.

display mode ana­log meter bars (distortion, power) have zero reference
on the left with autoranging meter bar displays increasing

AD

to the right. SIN

AD

SIN

values get larger in a range

has a "reverse" meter bar graph. As

of

0-20 dB the meter
bar graph gets smaller. The voltmeter display,
has left to right meter bars for all AC signals and positive
DC

signals. For negative

DC

signals, the meter bars

move right to left with zero reference at the right.

3.3.1.2 SPECIAL DISPLAY SELECT SWITCHES Three

special membrane switches are provided to control the

RF

digital volt meter,

j

~i~

modes. The
AM

modulation positive

"DEV/%AM"

..

measurement mode, deviation
matically selected if in FM and
selected if in AM. The
for either
the

"RF

AC

or

LEVEL"

level and deviation/percent AM

J

is

used to select the FM deviation

or

negative peaks. In the

j:C:cj

is

used to select the display

DC

voltages and the

digital readout

%AM

in

is

automatically

jV/:~mJ

volts

or

dBm. These
keys will respond only when the associated function
active.

MEA-

MODE

"DVM",

or

is

auto-

provides

is

"'-""

i

3-2

'C''2unn

Mon I

:J

I.

•

1111

I

Ll

1111

U MHZ

I

[;]

,.--

.j

"'

•

II II

+,3

,j

, KHz

)

FIGURE 3-2- CLOSE-UP

MEMBR ANE

3.4.0 PR

3.4.1

OG

RAMMl

The

unit has

Depressing any key will initiate

as

states
so

rs for
cursor
whenever the unit
programming sequence, only

I("'"

The servi
separate frequency for monitor
gram the monitor frequency, set the functio n switch to
"Pwr
Sens

To

Immediately the first digit
indicating the point
quency. Resolution is specified at

to

entries. As the
through

matically but may also be manually moved using the

right

I

R-•

time, the original number stored in memory is displayed
and

1

I

"'"]

programming mode.

detailed below.
LCD

in

the

I

EJ

and left

GENERA TOR AND MONI

ce monitor has the capability

Mon"

Mon"

enter an RF frequency press the B

999.9999

9,

the blinking cursor moves to the right auto-

or I <l

1,

if

the

the programming sequence is terminated. Pressing

loads the frequency

NG SEQUENCE

three

program

measurement displays
modulation

is

in a

and

or

"Sens

Mon"

can also be used on the R-2400).

of

MHz

meaning seven decimal digits

7 digits

l left cursors.

lA

...

•]

key

is

keys, B

the

The

left

section

data

entry state.

right cursors respond.

and

("Anlzr Pwr Mon"

on

the left L

entry. Next

are

entered using the keys 0

To

clear the entire entry, press

immediately depressed a second

and

also leaves the frequency

I

~=

user programming

and

right vertical cur-

and

will

not
When

numeric

TOR FREQUENCY

of

generate. To pro-

program

CD

enter

the desired fre-

100Hz

on frequencies

I

and

the

vertical

respond

digits

storing a

or "Anlzr

will blink

are

I

~

I

in any

0-9,

key.

valid

I

[>

~

~

OF

LCD'S AND

KEYBOARD

if

For example
the left LCD display,
MHz

can be entered

Pr

ess

Numeric Program

K

ey

4

5

6

5

321

I

NOTE:

entry)
The

quence is used to
except the function switch should
"Hi Gen" position.

Pr

Shaded area indicates flashing <ligit. (point

monitor

a frequency 195.050 MHz

ess

Key Display Comme

B

@)

EJ

RF

frequency is now stored.

program

-

'-1

c 0

.::J

an

RF

into

the

190.050

490.050

45

0.050

456.060
45

6.060 Manually Correct Entry

455.060

455.321 Complete

455.321

KH.t

is

present in

monitor

non

the generator RF frequency,

frequency 455.321

volatile memory as:

nt

Entry

of

The

same se-

be

set

to the

"Gen"

data

or

3-3

3.4.1.1 FREQUENCY COPYING

ator

frequency
monitor frequency,
quency twice. The frequency copy mode can be used as
follows:

is

to be the same as the programmed

it

is

not

If

necessary

the desired gener-

to

enter the fre-

Press

Program

Key

B

Display

455.3210

Comment
frequency in memory

Press

Program

Key Display

455.3210

(previously

stored generator

frequency now

displayed)

455.3210

455.3210

NOTE: Shaded area indicates flashing digit. (point

data

entry)
The

programmed generator

itor

frequency.
quency can be copied from the stored generator
frequency.

3.4.1.2 FREQUENCY

can be accomplished by using the
First, enter the frequency programming mode by press­ing the
mented using the

[

indicated
quency.
change

volatile memory, however, until B

[I>

cursor as desired.

B key. The flashing digit can now be decre-

~,'~

I key. Even while the digit

It

is

I and

In

a similar manner, the

I

6:;:

on

the display

is

not

necessary

made. Frequencies are

8TI

keys

Comment

Displays monitor

frequency

Set function switch
or

Hi

Gen

Displays monitor frequency

again.

Generator frequency
now 455.3210

is

now the same as the mon-

monitor

STEPPING

) key

or

is

to

are

used to position the flashing

Frequency stepping

I

6:;:

) and I

incremented using the

is

flashing, the frequency

the actual operating fre-

press B every time a

not

stored in non-

is

pressed.

to

Gen

is

~:;,

) key.

[0
[0
[0

m

[;]

m

[;]

.

§

B

NOTE: Shaded area indicates flashing digit. (point

data

entry)

3.4.2 DEVIATION LIMIT

of

fre-

The

The

deviation alarm

cy.

Start by pressing [

es the left
tion.
kHz with
using keys 0 through 9, the blinking cursor moves to the
right automatically but may be manually moved using the

[I>

press
second time. the original

displayed and the programming sequence
The

levels above this preset maximum and
measurement mode provided the function switch

""SENS
carriers.

limit.
returns

programming.

LCD

The

limit may

00.0 being a disable. As the 3 digits are

I right

or I <liieft

I""''

I If the

deviation alarm

MON"'

Press

Once loaded, the left

to the

455.3210

455.3210

455.3210

455.4210
455;5210

455.4210

455.4210

is

set in a similar

~,'~

).

The

display to view deviation alarm informa-

take

values between 00.0 and 99.9

cursors. To clear the entire entry.

I""''

I key

is

provided to warn

or

""PWR MON"' position for FM type

I.,

...

I to load the

measurement

reposition flashing digit

100
100
100

flashing ceases exit
program

manner

unit automatically switch-

is

immediately depressed a

number

stored in memory

programmed

LCD

display immediately

mode

kHz

increment

kHz

increment

kHz

decrement

mode

of

to frequen-

entered

is

terminated.

of

FM deviation

is

active

in

any

is

in the

deviation

selected prior to

is

3-4

NOTE: While programming the deviation limit, the func-

tion

is

inactive.

if

For example,

deviation limit of 5.5 KHz can be entered into

tile memory as:

Press

Numeric Program

Key Key

055

Press

a deviation limit 00.0 Hz

Display

VAC

9.65

m

§

00.0 KHz

05.6 KHz

Comment
Previous Measurement

Mode Selected

is

present, a

nonvola-

display will show the prompt
will

show the code last programmed. The code may take

on values from
with the blinking cursor position and press

If

digits 8

pressed, they will be ignored
invalid entries.

For example, to program a
code of

Press Press

Numeric

Key

350 octal:

Program

000 to 777 octal.

or

9 are pressed before the I

Key

Display

"DPL"

and the right side

Enter

the code starting

••"'

by

the unit because they are

DIGITAL

Comment

PRIVATE LINE

I

....

, J to load.

J key

is

de-

9.65

I

.....

l

NOTE: Shaded area indicates flashing digit. (point of data

entry)

3.4.3 TONE

Once a tone data sequence has been started by pressing

IJiJ

not respond until the data entry sequence
Programmed sequences
upper portion
modes selected

pressing

3.4.3.1

outputs.

"PL" and the right side will show the PL frequency last
programmed.
to

999.0 Hz.

ing cursor position and press

For example, to program a

Press Press

Numeric

Key

1507

NOTE: Shaded

entry)

3.4.3.2 DPL,IDPL (inverted

provided for

DATA

the vertical cursors on the left and right LCD's

of

in

j6~;;

J begins the sequences

PL

The

"PL"

The

left side

The

Enter

Program

Key Display Comment

~

~

I

.....

l

area

DPL

VAC

the right LCD, vary for modulation

the multimode code synthesizer. De-

position

of

the display will show the promp

PL tone may take on values
the frequency starting with the blink-

223.6

150.7 Hz

indicates flashing digit. (point

encode capability.

Prior Selected Mode

is

of

prompts, displayed

as

follows:

is

provided for

I

.....

J to load.

PL code of 150.7 Hz:

"PL"

Select
Modulation Mode

Hz

Prior Programmed Code

DPL)

The

"DPL"

The

left side

will

completed.

in

the

PL

tone

of

50

Hz

of

data

position

of

the

250

350

NOTE:

entry)

NOTE: All

tween 50 Hz and 9999 Hz.
digits accepted is four. This means if a frequency such as

1999.9
the least significant digit and you will get 9999.0

3.4.3.3 A

outputs.
"A
programmed.

blinking cursor position.
For

Press Press

Numeric

Key Key Display Comment

2325

is

NOTE: Shaded

entry)

Select

"DPL"

Modulation Code

.

§

8

I

....

, l

Shaded

FREQ"

example,

area

other

is

entered, the unit will automatically put a zero

The

"A"

The

left side

and

to

Program

rr.;;;l

~

270
250
250

350

indicates flashing digit. (point

sequences have frequency ranges be-

position is provided for single

of

the display will show the prompt

the

right side will show the frequency last

Enter

the

frequency starting with the

Press [

program a tone frequency of

1950Hz
2325Hz

Selected Code

Prior
Incorrect Entry
Move Cursor to First

Digit To Correct Entry

The

maximum number

.,,.,

J to load.

Select

"A"

Code
Prior Selected Tone

B

area

indicates flashing digit. (point

of

data

tone

2325Hz.

Modulation

of

data

of

in

3-5

3.4.3.4 B Same form as A

3.4.3.5

Numeric Program

AlB

T&V This sequence
2-tone paging. All timing
ware. The prompt sequence

by

immediately
quency

cy
vide the
press

For example, program a paging sequence for Motorola
two-tone paging formats using frequency

227.5
Press Press

in

the blinking cursor position. Once the frequen-

is

loaded, press I

"B

I

En'"

Hz as:

Key Key Display

the "B FREQ". First enter the A fre-

En"'

I,

FREQ"

prompt.

I to load.

225.6 Hz

..

§

is

for standard Motorola

is

preprogrammed via soft-

is

the

"A

FREQ"

the unit

will

immediately pro-

Enter

the B frequency and

Comment

Select

"AlB

Old

"A"

Frequency

Is Displayed

147.2

T & V"

followed

Hz and

Press Press

Numeric Program

Key Key Display

I

1366

1950

§

I

Ent"

I

En"'

I Ent

284.8 Hz Old

136.6

I

174.5 Hz Old

195.0 Hz

I

..

l

0.50

0.50

Comment

Select

"AlB"

Modulation Code

"A"

Is Displayed

Hz

"B"

Is Displayed

Sec

Old

"A"

Leave

At

Sec

Old

"B"

Var

\........,../

Frequency

~

Frequency

Tone Duration

0.50 Seconds

Tone Duration

1472

I

Ent.,l

2275

I

Ent"

NOTE: Shaded area

AlB

3.4.3.6
codes for which the software provides

prompts before the programming

1.

2.

3.

4. The "B

5.

6. The

V AR This sequence

"A

FREQ"

"B

FREQ"

The

"A

of the first paging tone to be set

to

9.

99

load.

OUR"

The

"A

time to be set
Enter

"B DLY" time
the delay time between the end
repeat of

147.2 Hz

254.4 Hz

227.5Hz

Old

Is Displayed

I

is

flashing digit. (point of data entry)

is

for

as above.

as above.

OUR"

DLY" (delay) prompt allows the interdigit

the time and press I

(duration) prompt allows the timing

seconds.

TONE

Enter

the time and press I

time

is

set

in

the same manner.

in

the range of 0.00 to 9.99 seconds.

En•

is

set

in

the same manner and

A.

"B"

Frequency

other

2-tone paging

six

is

complete.

in

the range of 0.00

..

I to load.

of

TONE

sequential

En•

..

I to

is

Band

the

025

0.25

Sec

I Ento' I

Old Interdigit Time

Sec
Sec

000

0.30

0.00

I Ento' I

5.00

Sec

Old Repeat Cycle Time
Leave

At

started

"A

FREQ"

1950

Same

is

for console to

by

pressing

for

function tone

I

Ent"

I

NOTE:

3.4.3. 7 TONE REMOTE This sequence

Shaded area indicates flashing digit. (point of data

entry)

base control using standard Motorola tone remote con­trol. All timing and level changes are preprogrammed
software. The prompt sequence

I

b:~:

1.

The first prompt displayed

Low

Guard (normally 2175Hz) tone. Program the fre-

quency using the numbered membrane keys, depress the

8 key to load. The "B

same key strokes to enter a function tone are required.
For example, program a Motorola tone remote control

sequence of
as:

2175

Hz

guard tone and

Recycle Rate

FREQ"

is

is

prompt follows and the

Hi

via

and

3-6

Press Press

Nu

meric

Program

Key Key Display Comment

Select "Tone R

Modulation

rr=l

~

B

1950

2175

Hz

50Hz

17

1950Hz

Old

Leave

Old

High

Guard Tone

At

2175 Hz

Function

emote"

Code

Tone

3.5.0 RF SECTION

3.5.1 RF IN/

A type N connector is provided
monitor
test in the
R-2400 will display
"An

lzr
output
200u V range.

CAUTION:

or

"STAND BY" mode.

the protective circuitry to operate.

OUT

to measure

"

Pwr

Pwr

Mon"

from

the

Do

not

CONNECTOR

the

RF

Mon"

function (.5

the

spectrum

is

used. In the "Gen" mode,

type N connector will be in the

apply RF power when unit

The

and

output

unit

must

allows

of

to

of

the
the radio under
125

watts). The

the signal when

is

on

be powered

service

the

RF

.1

uV

uo

FF"

for

to

B

NOTE: Shaded

data en try)

~
~

RF

area

Vernier

indicates flashing cursor. (point

Step

•

AF

ln/0\Jt

3.5.2 ANTENNA

of

A B

NC

connector

Mon"

(sensitive monitor) mode with a 1.5uV sensitivity.

The

R-2400 will display the spectrum
signal when the
RF signal in the range
from the BNC connector when in
erate)

mode

. This connector is fuse (PIN 6580377A61)

protected against inadvertently keying the radio under
test while connected
connector
from the front using a hex wrench .
the symptoms
off

-the-air receive sensitivity, this fuse may require

replacement.

and

3.5.3 STEP ATTENUATOR
An

eig

ht

position r
calibrated in
and

for

10

attenuation

3.5.4 RF VERNIER

A

potentiometer

output level when gen

is

provided for

"Anlzr

is

of

dB

Sens M

of

200u V to 1 V RMS

to

the input.

accessible by unscrewing

no "Hl

ota

steps

type vernier

ry switch

for

of

received

erat

GEN"

ing an

RF

on"

function is used. An

the

The

output

attenuator

control of

or

monitored

contro

RF

input in the "Sens

of

the monitored

is

output

"Hi

Gen"

(hi gen-

fuse is inside this

the

connector

If

the unit exhibits

and

very

poor

is provided,

outgo

ing RF level

signals.

l adjusts

signal.

the

RF

NOTE:

frequency
frequency
that

FIGURE

There

same

3-3-RF

are

two memory posit i

and

8 frequency.

or

B frequency in any code synthesizer

frequency chan ge will

SECTION CLOSEUP

If

an

3.4.4 CANCELLING ENTRIES

when partially comp l
SET'

always recalls

returns the cursor to the first digit.I•

old

numb

er and terminates the programming

parameter

the

sequence

eter

e.

stat

entered

cur

rently being

will retain its new value. Only the param-

eted

pressi•·

the

previously stored

completely

entered

will revert

ons

dedicated to the A

operator

appear

To cancel the

..

~JI··~J-

during

changes the A

in all modes.

The

..

··J

I•

...

the

earlier

to

mode,

entire

entry

first

"RE-

numb

er

and

•J

recalls the

mode.

Any

part

its previous

3.5.5 GEN ON/OFF

A special switch is avail
generated by t
ate) or "HI
useful for testing
rier

needs
checks.
"

FUN

CTI

ti

on

to a

Pu

sh-to-

GEN"

to be selected

The

generator
ON
generate

Talk

is energized.

3.5.6 ATTEN NOT ZERO

An

LED

of

ator
not

illuminates

control is not in

at

maximum sensitivity.

3-7

he

service monit

(high

where

SWITCH

function

as a reminder

the

able

to

turn

off

the

RF output

or

in

the ''GEN"

generate)

the

presence

eas

ily, such as in 20

is always

" is moved from a monitor func-

or

zero position,

functions. This is
or

absence

reenab

when

the

that the

and

(gener-

of

car-

dB

quieting

led when the

microphone

RF

attenu-

the

receiver is

3.6.0 OSCILLOSCOPE /

SPECfRUM

ANALYZER/ MODULATION SCOPE SECTION

A~

I'

'I

l

FIGURE

•or.

•INAU

DVM

3-4-CLOSE

'0•!11

It

UP OF SCOPE CONTROLS

3.6.1 INTENSITY

The intensity control varies the brightness

of

trace.

the

sco pe

3.6.6 VERT

A four position rotary switch controls the
play. Oscilloscope
right

of

the switch indicating volts per division. Values
marked to the left
tion

is

displayed

operation

of

the

on

the oscilloscope. The right bezel

uses values marked to the

switch are used when modula-

the oscilloscope has a numerical scale corresponding
values

of

.25 kHz, 2.5 kHz

and

25
This allows deviation measurements
when the service monitor
"DEY

/OJoA

M" and gi

LCD

display is not selected to

ves

the technician the ability to

detect non-symmetric modulation. Thi s switch

verLical

kHz per

to

be made even

dis-

of

to

division.

is

dis-

abled when the R-2400 spectrum analyzer is being used.

3.6.7 VERT VERNIER

The vertical vernie r potentiometer
inputs to the osc

ill

oscope. The calibrated position is

contro

ls the vertical

fully clockwise.

NOTE:

Th

e vertical vernier potentiometer is also func­tional when the R-2400 spectrum analyzer mode is being
used. It is
tion to ensure true

imponant

to have this control in the

IOdB

/ div vertical accuracy .

"Ca

l" posi-

3.6.2 FOCUS

The

focus co

ntr

ol varies the s

harpn

ess

of

the scope trace.

3.6.3 HORIZ

This seven position rotary switch selects the horizontal
sweep ra
the oscilloscope function
this same

.1,

te

control

and

.01 MHz/div

or

the external horizontal sweep

is

being used. On the R-2400,

is

used to select the dispersions

when the spectrum analyzer func-

input

tion is selected with the function switch. The sweep rate
is automatically fixed when in the spectrum analyzer
mode.

3.6.4 HORIZ VERNIER

This potentiometer controls the horizontal sweep rate

when the oscilloscope functions is being used.
calibrated position is

the

fully clockwise position. This
control is disabled when the R-2400 spectrum analyzer
function is being used.

3.6.5 SOURCE

Th

e source control

selec

ts

the sour
(modulation)
signal

or the recovered modulation signa

AC"

(external A C) position selects
input from the BNC
nal DC) position selects the

is a three position ro

tar

y switch which

ce for the sco pe vertical input. "

will

display

the

outgoing RF

l. The

AC

coupled ext

connecto

r.

DC

The

"EXT DC'

coupl

ed

external input

modulation

' (exter-

from the same BNC connector.

when

of

The

MOD

"EXT

erna

I,

"

l

FIGURE

3.6.8

The
tical

For

3-5-CLOSEUP

OF

SCOPE TRACE

POSITION

stacked concentric potentiometers control the ver-

and hor

izontal positions

of

the scope trace.

R-2400 spectrum analyzer operation, these con­trols are also used to center the observed spectrum.
When entering the spectrum analyzer mode, use the
''Vert Position" control (innermost control)
base

of

the noise floor

at

the bottom graticuJe. The

to

Horiz Position control is adjusted by first programm­ing for an RF frequency

of

000.0000 Mhz (de

reference), then with the disp ersion control set for

lMhz

/ div, use

the

Horiz Position control (oute
potentiometer) to center the observed spectrum display
horizontally

aro

und

the

center (5th) vertical graticule.

set the

rmo

st

3-8

3.6.9

TRIG

MODE

The

triggering

se

lects

the

~ff

to

save

tmuous sweep With

(~ormal)

tngg

er a swee

the

scope.

3.6.10

3.6.11

NOTE:

TRIG

The

triggering level

ger

voltage.

VERT/SINAD/DIST DVM

Muhi-purpose
section is a
for

the

following functions:

1.

External
Sensitivity ranges from 10 mV/div

2.

SINAD

3.

Distortion

4. Digital

ages
1,10,100

An

could

result in activating

can

induce

using the
occur

with the oscilloscope

much

too

viewed oscilloscope signal is
detlecting

mode

is a

scope

triggering

power

..

''

AUTO"

no

position

This

BNC

meter

Volt

and

extreme

multipurpose

sensitive for

far

requires

p.

The

"SCOPE

will

extend

LEVEL

potentiometer

input.

vertical

meter

provides 3 digit aut

and

reading errors

off-screen.

Also

connector

inputs

input

input

Meter

input. Accepts

300 volts full

overload

the

three

vertical

range

input

input

signal

position

mode

(automatic)

an

externa

OFF"

battery operating

located in the oscilloscope

to

connect

for

is .5 V

range

scale.

cond

protection

on all

connec

vertical

being

obviously

rotary

or

can

turn

provides a co

input.

oscilloscope

is .5 V

iti

The
l vertical
position

adjusts

on

measurement

the

signa ls

to

10

to

10

to
AC

and

oranging

to

the

circu

tor.

This

input

sensit

measured,

overload

switch

the

scope

"NORM"

input

turns

time.

scope

trig-

to

the

unit

operation.

V/div.

VRMS.

10

YRMS

DC

volt-

scales

oscilloscope

itr

y which

modes

will

only

ivity

and

ing

and

n-

to

off

.

of

set

the

and

3.7.1

VOLUME/SQUELCH The

the

spea

ker

output

thre

shhold level. Full

squelch.

NOTE:

3.7.2

3.7.3

3.

Monitor
squelch control
SlJUCich

squelch

IMAGE

In

either

monitor
quency
the
terference.
unsquelches
will verify

grammed
This

of

the local oscillator

programmed

The

the

that

frequency

switch is

R-2400 spectr

BANI)WJDTH

In

either "PWR

switch selects

kHz

modulation
communication
ulation
monitoring
is

7.4

The
output.

tion

acceptance

or

not

known

DEMOD

demod

measurements

out

Out

put signals

.

OUT

sens

is increased clockwise

point.

HJ/LO

normal

receiver, flipping

the signal being

also

um

MON" or

the

systems

locating a signal

BNC

volume

level.

The

squelch

counter

itivity is

mode

monitor

and

used

analyzer is being used.

WLI>E/NARROW

IF

bandwidth.

acceptance

used

connector provides receiver

can

or

greatly

this toggle switch selects

frequency

position

not

a receiver mixing image.

to

identify

"SENS

used

and

wide

for

commercial

be

used

for

external

control adjusts

clockwise disables

decreased

injection

to

remove

is

"LO".

the

switch

monitored

images when the

MON

Narrow

for

most

band

is

when the

for

transmitter

frequen

control

beyond

above

When

'" functions this

±75k

FM broadcast

exact

the

the

or

image

a signal

to

"HI

is

at

the

band

2-way

Hz

frequency

cy

counters.

adjusts

the
the

as

the
no-

fre-

below

in-

GH"

pro-

is

±10

radio
mod-

audio

distor-

3.7.0

MONITOR SEC

FI

GURE

TION

e

volume

Image BW

H1

Lo

3.6-CLOSEUP

MONITOR

0 Squelr.h

Wide

Nar

Demod

Out

OF

MONITOR

Sigl

•

vi

SECTION

3.8.0

MODULATION

3.8.1

GENERAL

The

multimode
used

to

generate

al

one

kilohertz

c~pability

smgle
microphone
and a BNC
external
capability
to

combine
code
composite

3.8.2 l KHz

An

internal 1 kHz
vided.
kHz
by

selecting

in any

3.8.3

EXT
A

BNC conn

sig

nal

to

tone

or

connector

signal

to

voice, any sin

synthesizer

signals

LEVEL

When

source

is

·'Dev/%AM"

selected

MOD

input

s.

SECTION

code

synthesizer

an

audio

signal.

tone

oscillator.

modulate a carrier

two

tone

paging

is available for voice

connector

generator.

do simultaneous modulation.

and a 1kHz

in

the full

disabled.

function switch

IN

ecto

is available

for

complete

tone

modulati
cou

Modulation leve

on

r is

provided

An

gle

nterclo

contains

Starting

the

section also

with PL,DPL,

type

signa

important

code

test

tone

testing.

on level

ckwise position

the

left L

position.

for

external

with a sinuso id-

lling. A

for

available

in

order to

ls

CD

all

controls

inclu

modulation

input

from

feature

It

is

possible

from

cont

rol

can

be

and

opera

modul

des

JDPL

four

pin

an

is

the

the

provide

is

pro-

the

viewed

tes

ation

,

1

3-9

3.8.4 MIC CONNECTOR

A

4·pin

connector

PTT

capabilit

phone

is

the

Function

The
modulation

With

Open

HlGE
GEN
PWR
SENS

mic input

MON

MON

is

provided

y. Depre

same

ssing

as changing

PIT

N HI

con

tains a deviation limit

peaks as

in a mobile radio.

with mi

the

PTT

the

Function

De

GEN
GE
HI

FUNCTION

3.8.5 EXT LEVEL

Co

ntr

ol

of the mic
generators
co

unt
ulation l
display

modulation sco

modulation

er clockwi se position,

eve

ls

on

the left

rophone

are

viewed by selectin g the "

LCD

pe.

level is

the

and

and oth

provided.

source is disabled.

can al

3.8.6 CODE-SYNTHESIZER LEVEL

The

pot

entiom
modulation
po

siti on, a minimum modulation l

OFF

contro
ulation levels
display
ulation
pendently

on
scope

eter controls

level. When in

l is prov

the

of

ided by

are

viewed by selecting the ''

left L

CD

and

. Al

so

the

code

the

function switch setting.

the

internal

the

full counterclockwi se

eve

the modulation

can

be viewed

synthesizer

cro

phone

button

With

prcs ed

GEN

N
GEN

er

er

external

When in

so

be

viewed

code

l is

operates

bias and

on

the

micro-

switch.

PTI

to

limit voi

DEV/%AM"

synthesizer

reached. ON/

switch.

DEV/%AM

on

ce

signal

the

full

Mod

on

the

Mod

th e mod-

ind

e-

3.8.8 CODE SYNTHESIZER MODE SELECTION

The code sy

the

formats list

corresponding LED

Onl

y when th e

the

off pos

pla

yed in
active
level

perform
all

cursor contr
will verify acce

1.

PL COUNT -Code
grammed PRI

counted

monitor functio n.

2.

-

-

''

PL-Progra
kH

DPL-Programmed DIGITAL PRIVATE

3.
codes

nth

esizer

pro

ed

below. Each

to

modulati

iti

on

will

the outputs be gen

the

right

LCD.

for

sett ing deviation with

control. Pos

ed

by

z.

are output

itioning of

th

e l

b.

J

ols in the unit,

ptance

frequency

of

VATE

mmed

.

vides capabi lity to se lect any

of

10 posi

indicate which

on switch

The

modul ation switch must

ve

rtical display cursor.

an

a switch activation.

synt

LINE

of

incoming

PRIVATE

mode

is

toggled away from

the

code sy

the selected m

audible feedback tone

hes

izer outputs pro-

frequency.

PL

ton

LINE freque

tio ns has a

is selected.

erated

es

if in

of

and

dis-

be

nth

esizer

ode

As

with

displays

either

ncies to I

LINE

is

3.8.7 MODULATION SWITCH

A 3 position toggle switch
modulation sour

I.

Cont.

- Allows

nal

outputs. Seq

as long as this switch is

2.

OFF-Turns
or

lDPL

cont

inuous or

burst

for

3.

Burst-F
is

present
position .
putting
cycle

to

out

put

position

In

the

position

as

the

swi tch is

the

code

of

burst

ce.

cont

uential

off the

mod

e, returning the switch

burst

120 ms.

or PL,

the
be

for as long

to

DPL

ca

stop

tone A and

for

as

long as

For

A/B

switch in

output.

simul

or

uses

conti

depressed.

completes the cycle it was in

tone

controls

inuous

tone patterns

enabled.

modulation

produce

the

Var

, A/B

the

For

tone

as

the

ate

low

guard tone.

IDPL modulation

nuous

When

(134.4 Hz) is gene

the

code

modulati

s a 134.4

ton

switch is held in

T&V, and

Bur

remot

switch is

cycling

on (recycle) sig-

will

signal. If in

to

e B

modes the

st

position

e,

the

held

mode

of

th e

the

switch is

rated.

the

synthesizer

be

repe

the DPL

OFF

Hz

stop

output

the

tone

remote

causes

last A

tone

in

the

the

code

as

released

and

a 120 ms

ated

from

tone

bur

one

bur

bur

long

st

is

st

st

-

MODULAMN

CD

dl!

Synlh

lvl

,

tK

iillv

l

Moo

FIGURE

i 01Jt

3.7-CLOSEUP

t.~I

OF MODULATION

SECTION

Mod

In

3-

10

4.

IDPL-Inverted
PRIVATE

5. A-

6.

7. A/B

8.

9.

10.

Tone

A is selected for

B-

Tone B

T&V

- Indicat

ing sequence has

AlB

VAR

- Indicates

able

programmed

been

selected for

TN

REM-Indicates

tone

remote

OPTION-This
pansion. Without an option card installed, this mode

cannot be selected.

output

LINE

code is se lected for

is

selected for

es

that

been

that

values for duration

output.

access sequence for

control has

mode

SEE PARAGRAPH

of

programmed

output.
output.
A/B tone

selected for

DIGITAL

output.

and

output.

AlB sequence with vari-

and

been

selected.

is

reserved

for

future

3.10.0

voice pag-

delays has

Motorola

ex-

3.9.0 REAR PANEL CONTROLS

3.9.1 BATTERY/EXT DC

If

turned
switch
the unit
switch

an external voltage source such as a

3.9.2

A 4-pin power
prime power source. A

on,

the

service

to battery

is

is

in

DC

IN

power

equipped with the battery

··EXT

DC'

connector

monitor

if no

AC

allows the unit to be powered by

to connect

connector

will automatically

source is available

option.

car

the

is

provided.

When the

battery.

unit to a

and

DC

3.9.3 AC

l.IA

AC line fuseholder. (spare fuse provided 65-00042092)

3.9.4 DC

DC

65-80397 A22)

SA

prime power source fuseholder. (spare fuse provided

FIGURE

3-8-REARVIEW

3-11

3.10.0

TWO-WAY

OPERATING
Being

the first in a series, the Two-Way Service Option

card

is structured with a unique
uses a list
merous signalling variables found in the land mobile in­dustry signalling standards. This operating system requires
the
the
ing
unique functions.

The functions

Service Option, RTL-4161A, are accessed via a special set
of

Function Codes. Each mode
code which must be entered by the operator. These Func­tion Codes are listed below.

of

operator

code

synthesizer

paragraphs

OPTION

CODE

I l

l 2

2 l

3 l

3 2

3 3 DTMF Manual Encode without PL
3 4 DTMF Batch Encode without PL
3 5 DTMF Manual Encode with PL
3 6 DTMF Batch Encode with PL

SERVICE

SYSTEM

numeric commands to accommodate the nu-

to first select the

section

detail

of

the R-2200 provided by the Two-Way

DPL

Decode

Inverted

DTMF Decode
DTMF Batch Encode
Duration and Delay
(Default
PL Frequency Select for simul PL and
DTMF Encode

DPL Decode

= 100 ms

OPTION

of

how

the

of

FUNCTION

operating

OPTION

the R-2200. The follow­operator

operation has a unique

Timing-

on,

system which

position within

accesses

Tone

50 ms off)

these

3.10.2

This sequence allows decoding
tone pairs. Decoding
3 different sources. The decoder will function
AIR, with a direct radio connection
Modulation In BNC connector (EXT
Modulation
tion
decode
connector. DTMF decoding modes

BATCH
must be decoded, a maximum

and stored in memory.

3.10.2.1

DTMF

Section

Switch must be

DTMF

DECODE mode. When a series

DTMF

CODE
Press Press

Numeric

2

2 1

Program

Key Key

EJ

DECODE

of

the standard

of

DTMF tone pairs

of

the R-2200 front panel. The Func-

in

the

"Gen"

tones via the External Modulation BNC

of

16

BATCH

Display

'31 Current state

dFd---

DECODE-ACCESS

is

functional from

or

from the External

MOD), located in the

or

"Hi

Gen"

of

operation include a

of

DTMF digits

digits can be decoded

Comment

memory.

Place MODULATION
SWITCH
and the unit is ready to
decode

Decode
Modulation

"CONT"

in

DTMF

DTMF

position.

16

DTMF

OFF-THE

position to

of

NV

"CONT"

while

Switch is in

3.10.1

3.10.1.1

NOTE:

3.10.1.2

NOTE:

DPL/IDPL

This sequence is for any DPL (DIGITAL PRIVATE LINE)
or

Inverted
modes
OPTION

Numeric

data

Numeric

1 2

data

of

position

DPL

Press

Program

Key

Shaded

entry)

IDPL

Press

Program

Key

Shaded

entry)

DECODE

DPL

(IDPL) decoding. The

operation

DECODE-ACCESS

Press

Key

are accessed by first selecting the

of

the code synthesizer.

Display

Comment

CODE

DPL

11

4 1 Current state

memory.

dPL - - - Ready to decode DPL

area

indicates

DECODE-ACCESS

Press

Key

Display

4 1

, ..... , dPL - - - Ready to decode

area

indicates

flashing

CODE

Comment

Current
memory.

flashing

digit.

1 2

state

digit.

or

of

NV

(point

of

NV

(point

IDPL

IDPL

of

of

NOTE:

data

@JorEJ

Shaded

entry)

~

~

~

~

~

area

dFd 123

=1234

=12345

1234567

234567=

1234567

dFd---

indicates

When finished decoding
DTMF
Modulation

"OFF"

Using right cursor, review
code stored in NV

memory.

"dFd"

off

Scrolling through
memory

A total
maximum can be
displayed at a single time.

End
is now reached.

Backspace using left

cursor

Place MODULATION
SWITCH
clear

for

sequence.

flashing

tone pairs, place

Switch in

position.

has now scrolled

the LCD display.

of

7 digits

of

decoded sequence

or

press Reset.

in

CONT

display

another

and

decoding

digit.

ready

(point

to

of

3-12

3.10.3

3.10.3.1

DTMF

The

Two-Way Service Option includes 4 different and
distinct methods
As mentioned previously, the option card is capable
encoding DTMF,
PL, 3) Batch with PL and 4) Batch without PL. Begin by
selecting the OPTION position

CODE3

Press Press

Numeric

Key Key Display Comment

3 3

4

2

ENCODING

DTMF

3

Program

EJ

of

encoding DTMF signalling tone pairs.

1)

Manual with PL, 2) Manual without

of

the code synthesizer.

REAL

TIME

··'34

dFE

dFE4

dFE2

dFE_

ENCODING-ACCESS

Current state

memory

Now in Real Time DTMF

Encode Mode

Place MOD switch in

CONT and set
Deviation to 3. 3 KHz

Now generating DTMF

Key 2

Place Mod switch in OFF

Mod switch in

Place

BURST. DTMF Key 2
is sent with a tone on
100 mS (default) or per
timing instructions

entered in

DTMF Encode mode.
ie. Access Code 3 1

Flashing underscore
Ready to enter special
character DTMF key.

User Defined

of

NV

of

If

modulation switch is placed in

is

played digit
Tone

ON, 50

timing parameters

NOTE:

3.10.3.2

Shaded

data entry)

DTMF

CODE3

Press Press

Numeric

Key Key Display Comment

3 4

area

BATCH

4

Program

I

....

, l

sent per the default timing ( 100 ms

ms

Tone Off) or the operator defined

(OPTION CODE 3 1).

indicates

3 Current state

dFE

dFE

dFE

dFE

= 1234

flashing

ENCODER

123

LCD display shows first

123 Enter EDIT mode

123 Moving flashing cursor to

123

"dFE"

= 12345

=

12345-

Reached end

= 12345 = Ready to

I

.....

l

=

5

l2345F

Have

"BURST"

digit.

NO

PL-ACCESS

memory

three DTMF characters
stored in NV memory

review code stored in
NV memory

has now scrolled

off

the LCD display.

code in NV memory
and can
or

backspace using!

and edit.

enter

DTMF character

loaded"*"

key into NV memory.

(point

of

of

enter

the dis-

of

NV

stored

new data

<I)

special

DTMF

6

NOTE:

EJ

If

modulation switch is placed in
sent continuous

If

modulation switch is placed in
be sent when digit key is pressed
key is pressed. ENTER key is used for special
character tones

dFEP

of

Ready to send

DTMF key either
continuously
mS. (ie. use
switch)

"*"

and

"CONT"

"#".

"#"

or

MOD

"OFF"

or

tone will

when ENTER

for 100

tone be

3-13

NOTE:

data

Shaded

entry)

EJ

area

=

l2345F

dFE

indicates

= Ready to terminate

DTMF EDIT mode.

123 Stored DTMF code is now

"l2345F"

Place MODULATION

switch in CONT. Entire
sequence
sent, or
to send digits one at a time.

flashing

of

BURST position

digit.

12345* is

(point

of

NOTE:

3.10.3.3 USER DEFINED

User can review
by
of

marker.

ACCESS

Press

Numeric

Key

NV

using cursors. No digits are flashing and the end

NV

memory

CODE

Press

Program

Key

is

3 1

Display

3

3

035

EJ

0.05 sec

0.15

memory when out

indicated

DTMF

4

sec Old Tone

by

"=="

ENCODER

Comment

Current state

memory

Old Tone On time

displayed. Set duration
time to
step)

Set interdigital time to

150

ms

of

edit mode

end

of

TIMING-

of

NV

350

ms

(next

Off

Time

(next step)

data

NOTE:

NOTE:

Preset the required PL code (para.

entering the Simultaneous

PL tones will automatically be superimposed on the

mode.
DTMF with a preset deviation equal to 25%
deviation level. Example: DTMF Deviation level
KHz therefore

To

PL Deviation level =

access special character DTMF keys perform the

following:

SPECIAL

CHARACTER

A

B

c

D

*(shown

as

on LCD)

PL & DTMF batch encoding

OPERATOR

§

§

§

§

"F"

§

3.10.3.4)

800Hz.

PROCEDURE

.

CD

.

0

.

0

.

0

.

0

of

the DTMF

ENTRY

before

= 3.2

EJ

EJ

B

B

l·"'"i

015

NOTE:

3.10.3.4

3 2

3 2

1507 3 2

3.10.3.5

ACCESS

Press

Numeric

Key Key

I.,,

..

I 3 1 Ready

Normal

PL

Numeric

DTMF

DTMF
lowed
tered in this mode will be carried over into all
DTMF

Press Press

Key Key Display

from

this

encoding modes

FREQUENCY

Program

2 23.6

BATCH

CODE

Program

3 6

Press

Display

to

select DTMF

Encode mode

Batch Encode procedure can be fol-

point.

Hz

ENCODE

Timing

of

SELECT-

Current state

memory

Prior Programmed Code

Ready to select desired

DTMF Encode Option

Code

WITH

Comment

parameters

operation.

ACCESS

Comment

PL-

of

en-

CODE

NV

# (shown as

on LCD)

NOTE:

NOTE: Should the R-2200, with RTL416IA Signalling

.,

NOTE:

To

clear

NV

press [

Tooo

j

Oat•

Option
ample - the unit may not operate
mode, when in the option position), it may be the result

of
A mode
software that will reset the memory to a default status
should this occur. This mode
option code 9 2.

performed before proceeding with any
shooting procedure.

basis for any

the two-way service option installed. This kit contains
the two-way service option
structions to properly install it.

installed, appear to operate abnormally (for ex-

invalid

data

being stored in the non-volatile memory.

of

operation has been included in the RTL4161A

The

RPX-4309A kit

R-2200

"P"

memory

to

.

§

end while

0

in

edit mode

EJ"'"

in

the batch encode

is

accessed by entering the

The

memory reset function should be

other

is

available on a field retrofit

or

R-2400 already shipped without

board

and all necessary in-

EJ

trouble-

3 6

I.,,

..

I

3 Current state

memory

dFE 123

First three DTMF

characters are
displayed

of

NV

3-14

SECTION4

OPERATING

4.1.0 OPERATION
The operator may use the

become familiar with the functions the Communication
Service Monitor
is

selected, its parameters are displayed

4.2.0 POWER UP

4.2.1 PARAMETER MEMORY
The unit contains nonvolatile memory that stores the

most recently programmed values for the following pa­rameters;

1.

Operating Frequency

2.

DPL

3.

PL Frequency

4.

Tone A and B
a) Frequency

b) Duration

c) Delay

5. Deviation Alarm Limit

Also included in memory are the most recent state
following membrane keys;

1.

DEV

2.

RF

V/dBm

3. Display select arrows (left and right)

4.

DVM

5.

Code
(vertical)

WARNING Lithium Battery

The processor module within this system utilizes a
lithium battery as a memory keep-alive voltage source.
Do not mutilate
lithium metal
presence of water
battery in fire, attempt to charge, heat above
solder directly to the cell.
to a reverse voltage greater than 3 volts. The battery may
burst and burn

CAUTION Lithium Battery

Lithium batteries are classified as hazardous materials
and must be disposed
the battery by placing it in with the everyday trash.

Consult state and local codes for the appropriate disposal

procedure. Motorola will dispose of the battery if the
expended battery
container and by the same method that the new battery
came to you, send to: Motorola Inc., Return Goods

Department,

Ill. 60196.

is

capable

Code

±

AC/DC

Synthesizer

or

is

a very active material that burns in the

or

or

release hazardous materials.

is

returned in the replacement battery

1313

East Algonquin Road, Schaumburg,

LCD's

of

Modulation

disassemble the battery cell. The

high humidity.

Do

of

accordingly.

and

CRT

display to

performing. As a function

on

the LCD's.

select

Do

not overdischarge the cell

Do

not dispose

arrow

not put the

100°C,

INSTRUCTIONS

4.2.2 DEFAULT PARAMETERS
The unit will initialize to the last active state unless the

of

battery

volatile memory

age
replacement.) Should this occur the initialized param­eter

the

All functions
tary switches

to the current positions

4.3.0 GENERATE OPERATION
The Service Monitor generates

or

of

AM,
to 1 GHz. To generate a signal the
is

NOTE:

due to inadvertent application
provided.

4.3.1

Output
IN/OUT" connector. Voltage output range

200 u V into 50 ohms for direct connection to the antenna

input
GEN"
tor
VRMS. This is sufficient for transmission through an
antenna connected to the antenna connector.

(P/N 60-83294N03) which powers the non-

or

defect. (See the maintenance manual for battery

values will be;
Operating
D

PL Code--000
PL Frequency-100
Tone A

a)
b) Duration--0.5 Sec
c)

Tone B

a) Frequency-1.5 kHz
b)

c)
Deviation Alarm
DEV
RF
Display Select (left) initial state

Display Select (right) initial state

PWR
DVM
Code Synthesizer

REM

NOTE: The Lithium Battery used for non-volatile

memory

of

and CW transmissions covering a range

placed in the

An

OUTPUT LEVEL

of

Frequency-100 MHz

Frequency-!
Delay--0.0 Sec

Duration--0.5 Sec

Delay--0.0 Sec

± initial state

V/dBm initial state

AC/DC

the optional RTP-4021A Battery Pack Option.

RF

protection circuit to protect against damage

in the

of

the equipment under service.
function
the unit. Voltage output range

is

faulty

or

has low output level due to

Hz

kHz

Limit--0.0 kHz (alarm off)

is

+

is

Volts

is

SINAD

is

RF

LVL

initial state

Moduhtion

is

included in every unit and

that

are controlled by toggle switches, ro-

or

potentiometers are initialized according

"GEN"

"GEN"

is

available at the antenna

is

of

the switches.

or

"HI

of

function

AC

select initial state

is

independent

RF

frequencies for FM,

of

"FUNCTION"

GEN"

is

position.

RF

power to the unit

available at the

is

Output

in the

BNC

is

200 u V to 1

200kHz

.1

connec-

or

RF

is

TN

switch

"RF

uV to

"HI

is

4-1

4.3.2 MODE SELECT
The modulation mode

switch. AM, FM, and

4.3.3

SIMULTANEOUS GENERATE AND MEASURE-

MENT OPERATION
The

following test setups and

of

simultaneous generate and measurement operation.

1.

Connect the
connector and the multipurpose measurement input
to the receiver audio output.

2. Set the function switch to

3.

Enter

the frequency by pressing

is

selected using the

CW

(no modulation) are available.

LCD

displays are examples

RF

In/Out to the mobile radio antenna

GEN

and

"MODE"

IL'::!.J

to Dev.

EJCD000000EJ

4.

Adjust the 1 KHz level for 3.0 KHz deviation and

then move the cursor

5. Adjust the
Read

6.

7. Increase the

8. Move the cursor
distortion in

9.

Move the cursor

10. Select
scope display

vertical trigger for oscilloscope display.

11. Apply test signals from the receiver audio stages to

the unit's VERT/SINAD/DIST/DVM input. The

same

may be used.

12. The voltage can be read
viewed on the oscilloscope.

RF

venier for

the receiver sensitivity in microvolts

RF

%.

AC

or

DC

is

x1

test probe used for

IL'::!.J

to SINAD.

12

dB

SINAD

generator level to 100 uV.

I

L'::!.j

to Dist.

IL'::!.J

to DVM.

volts using

desired select the proper external

on

Read

I:C::\

SINAD

the left

indication.

or

the receiver

switch.

If

oscillo-

and Distortion

LCD

display

dBm.

or

4.3.4 TEST PAGER DECODE AND ALERT FUNCTION
The

internal programmable code synthesizer generates
PRIVATE
LINE (DPL) squelch codes, two-tone sequential paging

and base station tone remote control signal continuously
or

in burst cycles as an internal modulation source. In

addition to the code synthesizer, modulation

taneously available from an independently adjustable
internal 1 KHz tone generator as well as from external
input sources.

1.

Connect the pager test fixture to the
nector.

2. Set the

frequency from key board.

LINE

FUNCTION

(PL)

AND

switch

DIGITAL

RF

to

GEN

PRIVATE

is

simul-

In/Out Con-

and

enter

the

EJCD000000EJ

3. Select the paging format.

frequencies. Start by pressing

4.

Activate by placing the Code Synthesizer switch in the
burst (momentary)
Code Synth Lvl for 3.3 KHz deviation. A functional
pager will respond.

GEN 154.5500

Enter

the pager tone code

1~::

J

or

continuous position and adjust

D

RF

IN/OUT

Pager

IN/OUT Vert/SINAD

FIGURE

RF

Dist/DVM

4-1-TEST

154.5500

GEN

I I

11

I I I I

12.0 dB

MOBILE

RECEIVER

SET-UP FOR

SENSITIVITY

FM

RECEIVER

FIGURE

PAGER AND ALERT FUNCTIONS

NOTE:

A/B T & V has preprogrammed timing sequences
for two-tone sequential tone and voice paging. A/B V
is

user programmable. Variable timing sequences are

used for

other

4-2-

TEST SET -UP FOR

signalling systems.

4-2

AR

4.4.0 MONITOR OPERATION

4.4.1 SENS MON
The Service Monitor

cies of 3 MHz to 1
monitor may be used to 1 MHz with reduced sensitivity.

1.

Connect
antenna connector located

2.

Set the

3.

Select the modulation type using the

4.

Enter

the

FUNCTION

the frequency from the keyboard

is

capable

GHz

BNC

antenna

switch to SENS MON.

of

with 1.5 uV sensitivity.

in

monitoring frequen-

(TEKA-24A)

the

RF

section.

MODE

to the

switch.

EJ~000000EJ

5.

Adjust the squelch and volume.

6.

Move the left cursor
right cursor

ceived audio from the internal speaker and view on

the oscilloscope.

NOTE: The antenna input

advertent keyup into the antenna input. Consult the

maintenance portion of the manual for fuse replacement.
In either

BANDWIDTH

bandwidth.

acceptance used for most 2-way radio communication

systems and wide band

ance used for commercial FM broadcast monitoring.

~~

PWR

MON

WIDE/NARROW

Narrow

[.6.J

to Dev/%AM. Move the

to frequency error. Listen to re-

is

fuse protected against in-

or

SENS

band

is ± 75

Mon 154.5500

lit

+4.5

MON

is ±

15

KHz modulation accept-

Ill

KHz

functions the

switch selects the IF

KHz

modulation

6.

Adjust the squelch

7.

Adjust for desired dispersion

3.6.3).

8.

Adjust the RF step attenuator to give the desired

The

signal level.

9. Check for the presence

Hi/Lo

4.4.2

PWR

For

1.

Connect the radio under test antenna out to the
IN/OUT

2.

Set the

3.

Enter

4.

Move the right cursor to PWR.

5. Key the radio under test and read

CAUTION: To prevent undue stress on the protected cir-

cuits
power monitor before applying power in excess of
mw.
practice not to leave the step
position.

High-powered equipment in the
have unusually fast carrier rise times, may damage the
service monitor with repeated activation
circuit. Ensure the
MON" position (this enables the protect circuit) before
RF

power

In either monitor mode, the displays can be selected
using vertical cursors to the left
frequency, frequency error, modulation level, distortion
and power when in the
or

CW signals.

switch (see 3.7.2).

MON

high power signal monitoring (.5

connector on the Service Monitor.

FUNCTION

the frequency from keyboard.

it

is

advisable to always switch the system to the

Additional protection

is

applied to the equipment.

and

volume.

of

switch to

is

also obtained

FUNCTION

PWR

MON function for AM, FM

of

.01

images using the Image

to

PWR

MON.

output

attenuator

1-30 MHz range, which

switch

is

of

each LCD to view

Mhz/

125

watts)

power.

by

making

in

the 0 dB

of

the protect

in

the

div (see

RF

200

it

a

"PWR

ANTENNA

FIGURE

OFF-

CAUTION:

max. input level

4.4.1.1 SENS MON
(R-2400

1.

2.

3. Adjust the Vertical

4. Ensure

5.

Care should be taken

only)

Connect the BNC antenna
tor

located in the RF section.

Set the Function switch
if

necessary (see 3.6.8).

that

Enter the RF frequency from the keyboard.

4-3-TEST

THE-AIR MONITORING

of

the "Antenna Input".

WITH

and

"Vert Vernier"

SET-UP FOR

to

not exceed the .5 watt

SPECTRUM ANALYZER

to

the "Antenna" connec-

to

"Anlzr Sens Mon".

Horizontal Position controls

is

set for "Cal".

EJ~C!J00000EJ

D

IN/OUT

FIGURE

L._______,J

RF

POWER

Mon xxx.xxxx

TRANSMITTER

4-4-TEST

MEASUREMENT

SET-UP FOR

62.5w

4-3

4.4.2.1

4.4.3
MENTS IN

The

Generate
measures the quality of the audio.

1.

2.

PWR

MON

(R-2400 only)
For

high power signal monitoring (.5 to

1.

Connect the radio under test antenna out to the
In/Out"

2. Set the function switch to

3. Adjust the Vertical and Horizontal position controls
if

4.

Enter the RF frequency from the keyboard.

5. Move the right cursor to

6.

Adjust the RF Step attenuator for maximum attenu­ation

7.

Key
tenuator for the desired viewing level.

8.

Read the output power on the LCD display.

TRANSMITTER

distortion

Connect the

and connect the modulation output to the radio mic
input. Connect the
purpose input BNC connector. This allows the unit to
be used as a test receiver.

Enter the

connector on the service monitor.

necessary (see 3 .6.8).

(70 dB)

the radio under test and adjust the RF step at-

THE

or

RF

WITH

PWR MON FUNCTION

meter

Monitor function.

RF

IN/OUT

Frequency

SPECTRUM ANALYZER

"Anlzr Pwr Mon".

"PWR".

DISTORTION

display can be viewed in either

to the radio antenna jack

DEMOD

125

watts)

MEASURE-

The

distortion meter

output to the multi-

"RF

4.4.4

MEASUREMENT

TONE

With the internal
measure the
switch can be moved to either monitor function position.

1.

Select the PL Count mode located
section using the [

2.

Select SENS MON (sensitive monitor) for off-the-air
monitoring.

3.

Enter

the frequency from the keyboard.

PL

PL tone

OF

TRANSMITTED

frequency counter it is possible to

of

a transmitter. The function

in

the modulation

~

J cursor.

EJCD000000EJ

4.

Key the transmitter under test and read PL frequency
in

the upper portion

NOTE:

The

PL frequency counter measures frequency

inputs

in

the range

counter

.1Hz.
tenths digit may fluctuate periodically.
sary to average the displayed values over time to deter-

mine the

is

displayed on the right LCD with resolution of

In cases of low PL tone deviation, the value

PL frequency within

of

of

the right LCD.

60Hz

to 270Hz. The output

.5

percent accuracy.

It may be neces-

"PL"

of

the

of

the

EJCD000000EJ

3.

Set the function switch to Pwr Mon and

4.

To display modulation waveforms of the transmitter

turn the oscilloscope source switch to

5. Adjust the I kHz tone level for proper deviation. (out
of clipping) Disable

6.

Read transmitter audio distortion
readout. Note that transmitter power and frequency
error

can also be displayed on the right LCD.

PL if resident

Gen154.5500

3.3%

j~J

to Dist.

"MOD."

in

the transmitter.

in

% on the digital

II

L______j

D

RF

IN/OUT

~

FIGURE

TRANSMITTER DISTORTION MEASUREMENT

Vert/SINAD DEMOD

Dist!DVM

TRANSMITTER

4-5-TEST

SET-UP FOR

OUT

I Mon 154.5500 I

ANTENNA

FIGURE

PL COUNTER MEASUREMENT

4.4.5

SIMULTANEOUS

ERATION

The

use

of
possible to view signal waveforms on the oscilloscope
and simultaneously view the measured digital and analog
values of the waveform on the left LCD. To measure an
AC waveform (RMS value) and display the waveform on
the oscilloscope CRT:

1.

Connect the multipurpose input test probe to the

circuit to be measured.

2.

Move the left
for display.

3.

Select the
"SOURCE"

4.

Select the
the trace.

4-6-

TEST SET -UP FOR

OSCILLOSCOPE/DVM

separate

proper

CRT

and

[~\cursor

EXT

AC

switch.

to DVM and select

position on the oscilloscope

Volt

per

division scale and center

LCD

~

displays makes it

AC

OP-

volts

4-4

5.

Read RMS volts on the left LCD display in both
digital and analog form. Digital displays are for
accuracy and analog displays are for use during

peak-

ing and dipping adjustments.

6.

Simultaneously view the signal waveform on the
oscilloscope CRT.

NOTE: This feature can be used while the service monitor

is

either generating

or

monitoring a

RF

frequency

or

for
general purpose troubleshooting of an audio circuit. The
AC voltmeter bandwidth

is

specified to

10

KHz.

CIRCUIT BOARD

UNDER

TEST

Q GEN 154.5500

X1

~

PROBE

Vert/SINAD/Dist

1.76

DVM

VAC

II

L.___j

FIGURE

4-7-TEST

OSCILLOSCOPE/DVM

SET-UP FOR SIMULTANEOUS

MEASUREMENT

4-5

SECTION 5

APPLICATIONS

-

5.1.0 SERV.ICE SHOP SETUPS

This section
diagnosing,
ranging

formation

the

R-2200/R-2400 service
controls
display. Maintain a permanent written log
urements

CAUTION: These

inclusive.

Motorola
plicability
ceiver's service manual for recommended test
and

specifications.

The

service monitor's DVM input is unbalanced (ground
referenced).
balanced circuits, such as certain receiver audio
or

telephone lines.

FIGURE

of

the

manual

and

adjusting communications

from pocket pagers

on

how to connect

and

indicators

and

information

are

typical applications

Not

every test works with every transceiver.

takes no responsibility for their accuracy,

or

safety. Always refer

Use

an

appropriate

5.1-SPECTRUM

guides troubleshooting,

to

repeaters. It contains in­equipment

moni

tor

and how to set

to

obtain

important

the anticipated

to

to

your

interfa

ANALYZER DISPLAY

5.1.1 SPECTRUM ANALYZER

The

spectrum
trum

while center frequency

play.

Use
quency directly. Use
interference, trace
ter

harmonics, check spurious responses

local

oscillator radiation.

propriate

frequency as required.

the

RF

In/Out"

999.9999
The

observed window

the

with
dynamic range

in

the 0

range

can

put

level.

attenuation

analyzer, figure 5

the

keyboard

frequency

spectrum

port

in a range

MHz programmable

dispersion control.

of

dB

position.

be extended

When

using

to

the actual dB reading

at

to

the

spectrum analyzer

RF

and

and

changes

The

at

either

for

the

least

55

With

up

to

the

attenuator,

.I,

displays the

is

shown

enter

IF

signals, observe transmit-

The

CRT

the

selected

analyzer

The

dB
the

the maximum allowable in-

on

the

channel center fre-

LCD

displays

the

system operating

displays a window

"Antenna"

from 1 MHz

in 100

spectrum analyzer has a
with

attenuator,

Hz

can

the

add

on

equipment

under test

of

all meas-

your

operation.

and

are not all

own

methods

ce

to

measure

outputs

RF

the

LCD

to

identify

and

receiver

the

or

increments.

be controlled

step

attenuator

the

useable

10

dB

per

the

scope.

the

LCD

ap-

trans-

HI

spec-

dis-

ap-

"RF

step

5.1.2 OPERATING NOTES FOR
SERVICE MONITOR WITH SI'ECTRUM
ANALYZER

to

of

to

In the
should keep in mind certain characteristics
this instrument.

5. When a "spurious'' signal

normal

I. Noise

of

the
sion switch is set
the receiver's
width (approximately
through the
dispersions,
IF

bandwidth is reduced

spectively, causing

2.

In

the
an

unmodulated

the characteristics

the

in
shape,

direction (Image switch).

The

3.

4. As in any spectrum analyzer, excessively

noise

Sideband Noise

purity

analyzer receiver, either
external

monitor's

components
observed
when

rier

that

could contribute

signals, even those
could
monitor
spurious signals
applied signa
to change
observing a suspected spurious signal on
display;
less than)
the

mixer is

tion is to
dB change
still too
interest, a "suck-out" circuit (either a cavity
crete
this signal.

the

center frequency displayed, it could be
age" signal caused by
local oscillator.
is being generated internally, change
switch
side

of
does,
be ignored.

use

of a spectrum

Floor

(grass) - caused by

spectrum analyzer receiver. When

IF

is necessarily set

IF

to

0.1

MHz/div.

medium

R-2400 give

atlenuation,

of

attempting

overload

strong

component filter)

and

the

then

and

that

appears

(SBN). It is a measure

tbe signals presented

RF

source (i.e. transmitter)

own

lst

will

add

on

the

the

RF

the

and

produce

that

l. Therefore, it is always

the

step

if

the signal rises (or falls)

lO

dB for a

probably

add

enough

on

the

to

To

observe

display

it

is

being generated internally

THE

R-2400

analyzer,

the

basic sensitivity

to

it's widest sweep

to

it's widest

40kHz)

be displayed. At

the

noise floor displayed

narrow

carrier displayed is due partially

of

the

the

sweep speed,

near a strong

mixer's injection,

in the

CRT.

It is

to

judge

synthesizer in

to

the SBN

at

a frequency not displayed,

I st mixer circuit in

excessive SBN

are

attenuator

10

being overloaded . The solu-

attenuation

display.

allow observation

must

the

determine

if

the spur moves

or

goes

allowing

and

.01

to

15

kHz

dispersions,

IF

filters.

best compromise between

the

signal applied

mixer

important

the

of

not actually present in

dB

step

lf

appears

service monitor's mixer I

The

and

to

and

quality

the

service

the

observed signal.

in 10 dB steps while

of

to

an

off-screen signal is

of

be

insened

above

if

this spurious signal

away

altogether:

the

user

common

the

disper-

(I

MHz/div.),

band-

more

noise

the

narrower

MHz

/ div., the

and 6 kHz

to

vary.

the

shape

filters used

RF

sweep

signal is called

of

the

the

spectrum

from

or

the

service

and

these noise

could

both

to

note

that

of

an

RF

car-

monitor

strong

the

service

or

discrete

good

practice

the

CRT

more

than

the

attenuator,

insure a

the

the

to

to

the

dB

signal

or

dis-

reduce

or

below

an

"im-

"Image"

other

if

and

may

to

re-

of

to

im-

an

be

the

(or

for

of

it

5-I

6.

When using the service monitor's "RF

"Pwr

Mon/

in the

Anlzr On" mode, there

In/Out"

directly connected signal path to the spectrum
analyzer receiver. Instead, the signal path
coupled through internal capacitance. Thus, a
signal

of

a given power level at a low frequency

appear to be

of

greater power at a higher fre­quency. Hence, a transmitter's harmonic power
appear greater than it really is, relative to the level
of

the carrier display. LEVEL ACCURACY OVER
WIDE FREQUENCY RANGES IN THE "Pwr
Mon/Anlzr On" MODE
Refer to page

7.

When using the spectrum analyzer feature, the

5-6

for a recommended procedure.

IS

NOT SPECIFIED.

HORIZ and VERT vernier controls MUST BE IN
THE

"Cal" POSITIONS. Failure to do this may

result in an uncalibrated display.

Out

0.70u41

I

Out

Ext Hod

Hod

0

In

0

dB QUIETING

D-~·~-

""

......

0

Rf ln/l:llt:

p

FIGURE

Vert/SINAD/

l);stii>I/H

p

14

Ext Horir:

.......

0 0

5.2-SINAD/20

TEST SETUP AND DISPLAY

is

MOIIl£

Spo

.....

port

is

no

loosely

will
will

REC£1YER

Ant

.....

a. With a 1000uV RF input level, adjust the volume

control to rated audio power output. EIA
204-C specifies that the receiver be set to produce
rated audio power before measuring
SINAD. A dummy load may

be
the speaker.
Select "Dist'' on the left LCD to display distor-

b.

tion or "SINAD" to display SINAD.

6. Set RF Step attenuator to -50 dB and the
nier"

to mid-range. The displayed RF level should
indicate about 2uV. Adjust the attenuator
steps) and the

"RF

Vernier" until a

reading appears on the display.

on

7. From the RF level
12

dB SINAD sensitivity in

the display, read the receiver's

uV

or

5.3.0 RECEIVER SENSITIVITY TEST
20

DB QUIETING

1.

Connect the service monitor to the receiver under
test, as shown in Figure 5.2.

Set the left LCD to
"DVM", "Function" switch to "Gen" and select
"FM"

or

"CW" mode. Press "Gen
able the generate function, indicated by the flashing
"Gen" indicator on the left display.

2.

Turn on the receiver (unsquelched) and turn up the
receiver audio gain to feed audio noise to the
tor (at least

Y4

rated audio power). Read the audio
noise voltage fed to the monitor. Note the noise
reading (REF) in volts.

Press "Gen

3.

On/Off'

to enable the generator. With
all modulation off, adjust the RF level until the
play reads

20

dB less than REF above (O.lOX the

REF voltage).

4. Read the RF level required to produce
ing in

uV

or dBm using the "RF V

12

used in place

"RF

(10

12

dB SINAD

dBm.

On/Off'

to dis-

moni-

20 dB quiet-

/dBm"

key.

RS-

dB

of

Ver-

dB

dis-

5.2.0 RECEIVER SENSITIVITY TEST-12 dB

SINAD/

AUDIO DISTORTION

the R-2200/R-2400 signal generator and SINAD

Use
meter to measure a receiver's performance by the fol­lowing procedure:

1.

As shown on figure 5.2, connect the Monitor's "RF

In/Out"

to the antenna connector

of

the receiver
under test. Connect the service monitor's
Sinad/Dist" to the receiver's audio output. Disable
all

PL's and open the Squelch.

Set the function switch to "Gen".

2.

3. Select the RF frequency and enter directly from the
keyboard.

4.

Select the "Dev" function on the left LCD. Use
"Dev,

OJo

+I-"

to verify+ and-deviations.

"1

5. Adjust

KHz Lvl" control for 60%

tion as indicated on the LCD.

noise modulation, set

"Code Synth Lvl" to min and

of

rated devia-

To

prevent spurious

"Ext Lvl" to "Off".

"Vert/

5.4.0 SQUELCH SENSITIVITY TEST

1.

Connect the service monitor to the receiver under
test, as shown in figure 5.2.

Set the "Function"
switch to "Gen" and modulation to "FM". Enter the
frequency

2.

To check
proper

of

the receiver under test.

PL/DPL

PL/DPL

squelch sensitivity, enter the

frequency/code from the key­board. Set modulation switch to "Cont", select
or

DPL

mode, enter Tone Data, and key in fre-

quency. Ensure that "Ext Lvl" and

"1

off.

3. Adjust the
nominal
PL/DPL

"Code Synth Lvl" control to provide a

750 Hz (500 Hz - 1 KHz) deviation

code. To check carrier squelch, turn

all modulation.

4.

Place "Gen
output from the receiver.

On/Off'

switch to

off

to remove the RF

Set the receiver's squelch
control to the point where the receiver just begins to
quiet.

PL

KHz Lvl" are

of

the
off

5-2

5. Return "Gen

On/Off"

switch to on. Increase the RF

Level by adjusting the step attenuator and

nier"

controls until the receiver just unsquelches.

a.

On

the LCD, read minimum squelch sensitivity

as

uV

or

dBm. This

sitivity

of

the receiver.

b. Determine the tight squelch sensitivity

ceiver by repeating steps 4

is

the threshold squelch sen-

of

and

5 with the receiv-

er's squelch control set to maximum tightness.

6.

Enable the receiver's

PL/DPL

squelch circuit. Fully
open the carrier squelch control. Increase the RF
level from minimum, as in step
squelch

just

opens.

On

coded squelch sensitivity in u

5.5.0 AUDIO

1.

Referring

POWER

to

OUTPUT TEST

figure 5.2, set "Function" switch to
"Gen" and modulation
quency and

PL

code.

2. Adjust the step attenuator and
trols to
control
scale.

3.

Select "DVM" "AC" function.

1000uV (-47 dBm). Adjust the
to

600Jo

of

the rated deviation on the KHz

Use the

"RF

In/Out"

to

5,

until the receiver's

the right LCD, read the

V or dBm.

"FM". Enter the RF fre-

"RF" Vernier' con-

"1KHz

connector for this test.

4. Connect a suitable resistive load that can dissipate
the receiver's rated audio output, in place
speaker.

(If

the receiver

is

using a "floating" or
"bridge" output amplifier, connect a 1 : 1 isolation
transformer across the load resistor).

5.

Connect a scope probe to the service monitor's
"Vert/SINAD/Dist"
probe across the load resistor

input connector

or

to

and

the isolation

transformer.

6.

Connect "RF

In/Out"

to the receiver's antenna
port. Adjust the receiver's volume control for the
highest voltage reading on the
does not have clipping
of

the radio's spec as viewed on the oscilloscope.

7.

Calculate the audio power by the following

DVM AC scale which

or

other distortion in excess

formula:

(AC volts)2

Load

Resistance (ohms)

8.

Power

If

Out

(Watts)=

the receiver does not produce rated audio power
output, use the service monitor's oscilloscope and a
scope probe to trace through the audio stages and
locate the problem.

"RF Ver-

there-

Lvl"

of

the

clip the

4. Adjust the "Code Synth Lvl" control for 20%
rated deviation

1 KHz in a

LCD and

5.

Connect the service monitor's "RF

"AC" volts.

on

the Dev scale, for example:

5KHz

system. Select "DVM" on the left

In/Out"

the receiver's antenna port. Connect the

of

port

to

"Vert/
SINAD/Dist" input connector to the receiver's
speaker

is

output

using a scope probe.

If

the speaker

"floating", use an isolation transformer to avoid

shorting the output stage to ground.

to

6. Adjust the receiver's volume control
erence level reading
free

of

clipping

on

the

AC

at

any frequency within the 300 to

obtain a ref-

volts scale which

is

3000 Hz band. Return to 1 kHz and note this read-

ing as the reference level (in AC volts).

7.

Refer

to

the audio response curve in the receiver's

service manual. Change the Tone A frequency

the tone display LCD
the curve

8.

Maintain FM deviation
tion,

to

be measured.

as

set in step 4. Note the audio level at each

to

the value for each point

at

20%

of

the rated devia-

frequency. The level in dB must be calculated
20 X log(V

/VREF)

where VREF

is

the voltage re-

on
on

as

corded in step 6.

9.

EIA

RS-204C specifies the frequency response for

NBFM receivers over the range

of

300Hz to 3000
Hz as follows:
a. Audio response for receivers using loudspeakers

shall

not

vary more

than

+ 2 dB

or

-8

dB from a

standard 6 dB per octave curve, with reference

taken as

1000 Hz.

b. Audio response for receivers using headphones

or

telephone lines shall not vary more

than

+ 1

dB or -3 dB from a standard 6 dB per octave

curve, with reference taken

at

1000 Hz.

10. Plot the resulting values using 0 dB as the reference
and compare them with the 6 dB per octave curve in

your receiver's service manual

specification as shown

on

or

figure 5.3.

-6

dB/OCT

1\VE

with the

SLOPE

EIA

+9.Sd9

5.6.0 AUDIO FREQUENCY RESPONSE

1.

Use the keyboard
PL/DPL

2.

Set the "Function" switch
to

code (if any)

"FM", step attenuator

to

enter the frequency and

of

the receiver under test.

to

"Gen" and modulation

and

vernier controls

1000uV (-47 dBm).

Select and set Tone A

3.
switch

to

"Cant".

to

1000Hz.

Set modulation

to

5-3

300Hz

FIGURE

5.3-RECEIVER

1000Hz

FREQUENCY RESPONSE

AUDIO

5.7.0 MODULATION ACCEPTANCE BANDWIDTH

1.

Perform the I2 dB SINAD Sensitivity test with the
service monitor in the same set-up as shown in
figure 5.2.

2. Increase the RF output level 6 dB above the I2 dB
SINAD level, to double the voltage. For example,

0.35uV increased 6

3.

Turn the

"I

KHz Lvl" control clockwise to increase

the deviation until the

dB. Read the amount
the modulation acceptance bandwidth

dB=0.7uV.

SINAD level returns to I2

of

deviation

on

the display as

of

the re-

ceiver.

4. A typical modulation acceptance value for a re-

ceiver

is

7 KHz. Refer to the specification for the

of

specific receiver under test. Any loss

modulation
acceptance bandwidth indicates improper align­ment

or

a component failure in a receiver's IF cir-

cuit.

RF PRESELECTDR

SHAPE

AIID

BANDWIDTH

DID

\lwt:ISI\IAD/

Rf

h/Out

--

Ext

.......

-

Out

Hod

Out

Ext

0 0 0 0 0

Hod "

I. Connect the service monitor's "Antenna" to the

antenna connector
nect the

"Vert/SINAD/Dist" port to the RF probe.

of

the receiver under test. Con-

Connect the probe to the first available low im­pedance point following the preselector, as shown

in figure 5.4.

2. Disable the receiver's mixer injection.

3.

Set scope to Ext Vert DC, "Function" to "Hi Gen",
modulation to "CW", and the scope sweep control
to

"IOOuS/div".

4. Enter the approximate center frequency

of

the pre­selector. Adjust the RF Level (and scope vertical
controls) to produce a trace on the

CRT

screen at
the lowest readable RF level to minimize the
possibility

Using the Frequency Stepping function, determine

5.

of

overloading the circuits being tested.

at what frequency the peak DC voltage occurs on
the DVM or CRT.

6.

The 3 dB

(.

707

of

peak) and 6 dB (.5

of

peak) band­width points can be checked by stepping either up
or

down in frequency and observing the change in

DC level from the RF probe.

'Monl:M.:I:!OMHztl

t>.v •

I

0.0

ICHt

E:J

fnq

•

Errar

0.00

ICHt

D

K.ECTIDN

fl.

TER

II..ECTIIN

FRE0

SIJNM.

5.8.0

FIGURE

RF PRESELECTOR

5.4-

PROBE SETUP

SHAPE

AND

BANDWIDTH
Use this test to insure proper preselector alignment for

multi-frequency receivers. Tune the preselector for
greater rejection

of

an interfering frequency from near-

by transmitters.

YwtiStc""/

0 Q

5.5-

FREQUENCY ADJUSTMENT SETUP

Ext

HoriE

Domod

0 0

Out

LfiiT

Hod

lJNDER

Out

0 0

TEST

Ext Hod

FIGURE

5.9.0

Rf In/out Dlstii>IIM

RECEIVER FREQUENCY ADJUSTMENT

I. Connect the service monitor to the receiver under

test, as shown in figure 5.5.

2. Set "Function" switch to "Sens Mon" (or "Anlzr
Sens Mon"

on the R-2400). Program the monitor

for the local oscillator frequency.

In

5-4

3.

Place the pick-up loop in close proximity to the

is

receiver so that the local oscillator signal

coupled

to the monitor input. Using the frequency error

function, adjust the local oscillator for the desired
frequency.

4.

Change the "Function" switch to "Hi Gen" and
enter the proper carrier frequency. Introduce
cient signal level into the RF input to fully quiet the
receiver and adjust the discriminator to zero volts

DC for receivers requiring such an adjustment. For
receivers with quadrature

or

more critical detectors,
adjust detector tuning control or local oscillator
jection frequency for minimum distortion

or

SINAD performance.

5. For pagers with the battery saver feature, check the
local oscillator for pulse operation without remov­ing the unit from it's housing.

1.

.....

O.v

,.

,:54.:5:50-

3DICHz

11

Pwr~

D

Yort/SrtN>/

Rf

"'Out

Dist/DYM

p I

Ext

Horiz

0 0

IINC

r

TRANSMITTER

FIGURE

5.10.0 BASIC
POWER, FREQUENCY, AND DEVIATION

A. Basic Terminated Measurements

CAUTION:

transmitter only to the service monitor's
port. Do not connect it to the service monitor's "An­tenna" port.

The built-in RF load dissipates up to
minutes and
keys a high-power transmitter into the monitor for a
time long enough to threaten overheating the
measuring circuitry, the system's audible alarm sounds,
warning

5.6-

TRANSMITTER TESTS SETUP

FM TRANSMITTER TEST:

1.

Connect the service monitor's
port to the RF output

of

the unit under test
and make the other connections as shown in
figure 5.6.

For

power output measurements, connect a

up

to

125

W for one minute.

to

un-key.

l>omod

Out

TEE

'1

Mr;

N.I>IO

"RF

"RF

50

W for three

If

Mod Out Ext Mod

c 0

It

In/Out"

In/Out"

a technician

power-

suffi-

in-

best

2.

Set "Function" switch to "Pwr Mon" (Or "Pwr
Mon/

Anlzr On"), "FM", and "Squelch" control
to threshold. Enter the correct transmitter carrier
frequency.

3.

Set the step attenuator to

-30

dB. For low-power
transmitters, it may be necessary to reduce the at­tenuator setting to unsquelch the monitor. Too

high an attenuator setting
setting inhibits the frequency error display.

or

too tight a squelch

Ac­curate measurements require sufficient signal
level from the radio to fully quiet the service
monitor's receiver.

4.

Use good quality cables

of

minimum length be­cause cable-loss can be a significant factor in RF
power measurement, especially at

UHF

and
above. Key the transmitter and read the power
indicated on the display.

5. Read the transmitter's frequency error indicated
on

the display.

6.

Refer to the radio's service manual to determine

if

power and frequency are within spec limits and

determine

7.

Proceed to check modulation as follows:

a. Turn

kl

Out"
the level
transmitter.

if

any adjustments are required.

off

all modulation sources at the "Mod

of

the service monitor in order to check

of

PL

or

DPL

deviation from the

Switch "Function" to "Pwr Mon"

to observe recovered audio.

b.

Key

up transmitter with appropriate

DPL

enabled and read "Dev" from the left
LCD. Refer to radio service manual to
mine

if

c.

With

adjustment

PL

or

DPL

is

necessary.

modulation properly set, in-

PL

deter-

or

troduce I KHz modulation to transmitter

audio input by adjusting the

"1

KHz Lvl" con­trol. Check service manual to determine the
minimum level required for proper MIC sen­sitivity as
to insure proper IDC function. Read
Out"
switching the left LCD to

well

levels

as the maximum level required

"Mod

on

the DVM by temporarily

"DVM", and

"Source" to "AC".

d. At the maximum audio input level, read

"Dev"

on

the display and verify that it falls
within the maximum rated system deviation
specified in the radio's service manual. Make

adjustments as required.

e.

Verify proper MIC sensitivity by setting "Mod
Out"

to the minimum threshold level per the

service manual and reading corresponding

"Dev" on the display.

B.

Off-The-Air Measurements

1.

Connect the TEKA-24A pick up antenna to the
service monitor's

"Function" switch to "Sens Mon" (or "Sens

the
Mon/

Anlzr On")

"Antenna" connector. Change

2. Operate the transmitter under test either into its
own antenna

into a dummy RF load,

as

shown

or

in figure 5.6.

3.

Set the service monitor's "Squelch" control to
threshold, and enter the correct carrier frequency.

5-5

4. Adjust the attenuator as in step A-3 above, to
produce an adequate signal level to the service

monitor's receiver.

5.

Adjust the transmitter and follow the same pro­cedure outlined in steps A-5 through A-7 above,
to measure frequency and deviation.

6.

This same method may be used to verify fre­quency and deviation

of

a remotely located trans­mitter by reducing the attenuator setting to fully
realize the 1.5uV

(10 dB SINAD) sensitivity
the service monitor's "of-the-air" monitor func­tion. To insure sufficient measurement accuracy
however, make sure the Monitor receiver
quieted as in step A-3 above.

C. Harmonic

1.

Referring to Figure 5.6, insert a fixed power at-

Power Measurement (R-2400)

tenuator between the RF output connector
transmitter

R-2400. The power rating
be at least equal
and a minimum
power

and

the "Antenna" port

of

this attenuator must

to

the rating

of

30

dB attenuation. The input

to

the antenna port must not exceed 0.5

of

the transmitter,

watt.

2.

Set the "Function" switch to "Sens
On"

and enter the carrier frequency, as before.

3.

Observing the CAUTION above, with a fixed at-

Mon/

tenuator in series, key the transmitter and set the
step attenuator for a peak indication on the spec­trum analyzer between the REF and
graticules. Note the displayed level and the step
position in dB. De-key the transmitter.

4. Enter the frequency
signal

of

interest.
observe the level
analyzer, adjust the step attenuator
should the signal be too low
that the signal changes

of

the harmonic or spurious

Key

the transmitter and

of

the signal on the spectrum

if

necessary,

to

observe. Confirm

10

dB for a

10

dB change

in the step attenuator setting (See notes on page

5.2). Note the level

of

the signal and the step at-

tenuator setting, in dB. De-key the transmitter.

5.

Compute the level difference between the carrier
and the spur
A. Let

/harmonic

"REF"=

as follows:

0 dB, and step position

is

tive number.

B.

PC=

displayed level

-3

dB-(-50

C.

P1

=displayed level

-22 dB-(

-30

dB)=

dB)=

of

carrier-(step) ie.:

+47

dB

of

spur-(step) ie.:

+ 8 dB

D. The relative difference between the carrier and

spur/harmonic levels

=39

dB.

is P diff=PC-P1

is

of

of

Anlzr

-10

a nega-

=47-8

of

fully

the
the

dB

Mon 1 !54

.:5:50

DYM •

AC

r-.lz

+.IOOY

D

Rf

Jf

FIGURE 5. 7-TRANSMITTER AUDIO FREQUENCY

Yert/SifN>/

In/Out Distll>YM

Q

cp

RFOOTPUT

TRANSMITTER

Mon 1 !54

Dist • 3.0111

Ext

Horiz

o.mod

o o

BHCTEE

l

~

RESPONSE

.:5:50

MHz

Out

MIC

Mod

AU>IO

Out

~~

If

Ext

Mod

o

In

D

0

Rf

y.,-t/SifN)/

In/Out Distll>YM

(

~

rl

'~

RFOUTPUT

Ext

Horiz

o.mod

0 (

[J

Out

MIC

Mod

AU>IO

Out

(~

If

Ext

Mod

0

In

FIGURE

5-6

TRANSMITTER

5.8-

TRANSMITTER AUDIO DISTORTION

SETUP

300Hz 1000Hz

+9.5.&

2500Hz 3000Hz

7.

Plot the

data

points obtained above in dB relative to
the 1 KHz level and compare with the transmitter's
specifications.

mitter's frequency response be within
dB

of

a + 6 dB per octave pre-emphasis from 300

3000 Hz
2500 and

EIA

RS-152B specifies that a trans-

+ 1 dB

(6

dB per octave roll-off allowed between

3000Hz).

Moll 1

Refer to figure 5.9.

:54~

!'liz

DYM.

AC+.100Y

or

-3
to

FIGURE

5.11.0

1.

2.

3.

5.9-AUDIO

TRANSMITTER

FREQUENCY RESPONSE

AUDIO

DISTORTION

Before starting this test, adjust the transmitter's

IDC

to

specification.

Connect the service monitor
shown in figure 5.8.

Turn

off

the modulation. Disable

"Function" to

Observe caution on page 5-5.

"Pwr

Mon"

to

the transmitter, as

PL

or

DPL.

(or

"Pwr

Mon/

On").

4. Key the transmitter and adjust the
600Jo

of

trol for

full-rated transmitter deviation on

"1KHz

Lvl" con-

the left LCD.

5. Select

"Dist'' on the left LCD. Read transmitter

distortion from the display. Unkey the transmitter.

5.12.0 TRANSMITTER AUDIO FREQUENCY
RESPONSE

1.

As shown in Figure 5.7, connect the service moni­tor's

"RF

In/Out"

put

and the "Vert/Sinad/Dist" input jack

"Mod

Out"

port

to

the transmitter's RF out-

jack through a BNC tee connected
the transmitter's microphone audio input. Disable
PL

and

DPL.

2. Select "DVM" in the left LCD
switch
"FM",
and
Turn
ing an
"Pwr
bandwidth

.01

to

"AC". Set "Function" to "Pwr Mon",

attenuator

to

-40

"Tone A". Enter the transmitter frequency.

off

the

"1

KHz Lvl" and "Ext Lvl". When us-

R-2400, the "Function" switch may be set

Mon/

Anlzr

of

On"

to

the modulated carrier. Set "Disp"

MHz/Div.

and

set the source

dB modulation

to

observe the occupied

3. Enter the required Tone A frequency.

4. Set

"Function"
On"). Key the transmitter
Lvl"

to

provide

5. Note

both

and

the test frequency, for later use.

6. Repeat the above procedure, adjusting
Lvl"

to

maintain 30%

modulation frequency

to

"Pwr

300Jo

Mon" (or

and

of

rated transmitter deviation.

"Pwr

Mon/

adjust "Code Synth

the transmitter MIC audio input level

"Code Synth

of

rated deviation, for each

to

be tested.

Set

Anlzr

OJo

to

the

to

"Cont"

to
to

Anlzr

D

Rf

FIGURE

5.13.0

1.

Connect the service monitor's
output connector
shown in figure
"AM". Observe
section.

2. Connect the service monitor's
to
crophone input using a BNC tee connector.

3. Set left LCD to
function.

4. Adjust the
proper input signal level
the transmitter's service manual
for this level.

5. Key the transmitter. Read
display.

Ytrt./SitAD/

In/Out

Dis11DYM

!3:1

I

Ext Horlz

•'

LE\IEL

SETLP

RFOUTPUT

AM

5.10-AM

AM

MODULATION TEST

"Vert/Sinad/Dist" and

DISTORTION

TRANSMITTER

MODULATION TEST SETUP

of

the transmitter under test, as

5.1

0. Set "Function"

caution in basic transmitter tests

"DVM" and the

"1

KHz Lvl" control to provide the

Demod

0 0

to

to

the transmitter. Refer

OJo

Ou1

Mod

Ou1

Ext

Mod

MIC

ALOKJ

It

"RF

"Mod

In/Out"

to

Out"

to

"Pwr

Mon",

connector

the transmitter's mi-

"AC"

voltmeter

to

obtain the value

AM

on

the left LCD

In

the

to

5-7

6. To check the transmitter's distortion, connect the
service monitor's

"Demod Out" to the

"Vert/
SINAD/Dist" input jack. Set left LCD to "Dist''
and read

If

using an R-2400, the "Pwr

OJo

distortion

on

the display.

Mon/

Anlzr On" function
may be used alternatively, to observe both the modula­tion, recovered demod and frequency spectrum signals.

0

Rf

In/Out

Ywt/SII.N>/

1>151/DIIM

Ext Horiz

0 0 0 0 0

Domocl

Out

Mod

Out

Ext

Mod

In

5.

Tune the pass-band knobs
duplexer receive leg, for a peak reading

of

the cavities in the

on
ceiver limiter meter. Reduce the signal generator
output, as necessary, to keep the receiver limiter

meter reading below saturation. This completes

the pass-band adjustment for the receiver leg.

6.

Set the "Function" switch to
"Pwr

Mon/

Anlzr On") and the attenuator to

-30 dB.

For

low-power transmitters, it may be

"Pow

Mon" (or

necessary to reduce the attenuator setting to un­squelch the monitor. Too high an attenuator set­ting

or

too tight a squelch setting will inhibit the

of

display

7.

Enter the transmitter frequency. Key the trans-

frequency and deviation information.

mitter and tune the pass-band knobs
cavities in the duplexer transmit leg for maxi­mum power output. This completes pass-band
adjustments.

~~~

O.v~Pwr~

D

there-

of

the

FIGURE

5.11-DUPLEXER

ADJUSTMENT

5.14.0 CAVITY AND

DUPLEXER

BANDPASS ADJUSTMENT
A. Passband Adjustment

1.

Connect the service monitor's
in-service duplexer antenna port as shown in
figure 5 .11.

2.

Set left LCD to "Dev", "Function" switch to
"Gen", "FM", and modulation switch to
position.

3. Enter the receiver frequency.

4.

Set the RF Step attenuator to
Vernier" to mid-range, to allow adequate signal
to get through a mistuned duplexer and quiet the
receiver. Reduce the signal generator output, as
necessary, to keep the receiver limiter meter read-

ing below saturation.

port

if

tenna"

the duplexer

start.

PASSBAND

SETUP

TUNING

"RF

In/Out"

to the

"Off'

-30

dB and the

"RF

Use "Hi Gen" and the "An-

is

badly mis-tuned, to

0

-

Rf

In/Out

~'='

0 0 0

:10

1111

PO\IER

LOAD

FIGURE

5.12-DUPLEXER

REJECT

NOTCH ON RECEIVE LEG

5.15.0 CAVITY AND
BANDPASS

B.

Adjustment

1.

Connect the service monitor's

WITH

of

Reject notch on the Receive leg.

in-service duplexer as shown in figure 5.12.
Disconnect the cable at the duplexer receiver port
that comes from the receiver. Move the monitor's
"RF

In/Out"

port to the duplexer receiver port. Connect a

power-rated dummy load to the duplexer anten-

na

port.

Mod

011

Ext

Mod

Ext

Horir

Oomod

011

0 0

In

ADJUSTMENT SETUP;

DUPLEXER

REJECT

TUNING

NOTCH

"RF

In/Out"

to the

cable from the duplexer antenna

5-8

2.

Set the "Function" switch to "Pwr
On" and attenuator to

-30

dB. Verify that the

Mon/

display's center frequency reads the same as the
transmit frequency in step

3.

Key

the transmitter and adjust the reject notch

adjustments on the duplexer receiver

A-7 above.

leg
for minimum signal on the display. Change the
attenuator, as necessary, to keep the signal on the

display.

4.

Loosen the cavity reject adjustment nut and slide

it within its slot while watching the display.

Be

Tighten the adjustment nut.

careful not to
mistune the rejection adjustment. Fine tune the
rejection adjustment by turning the bandpass

of

knob a maximum

+/-15

pletes the duplexer receiver

degrees. This com-

leg

reject notch ad-

justment.

~

r---1

o-~,·~

.........

0

Rf

o./Out

~..=/

5llllt1POWOILOAD

Ext-

0 0 0

Domod

Out

Hod Otrt Ext Hod

0 0

Anlzr

cavities

k-1

3. Set the attenuator to

Vernier"

to mid-range, to allow adequate signal

-30

dB

and the "RF

to get through the duplexer and quiet the

ceiver. Reduce the signal generator output, as
necessary, to keep the receiver limiter meter
below saturation.

4.

Adjust the reject notch adjustments on the

leg

duplexer transmit

cavities for minimum signal

level on the receiver limiter meter. Change the

signal generator output, as necessary, to keep the

of

received signal up out

the noise and below

saturation.

5.

Loosen the cavity reject adjustment nut and slide
it within its slot while watching the meter.

Be

Tighten the adjustment nut.

careful not to
mistune the rejection adjustment. Fine-tune the
reject notch adjustment by turning the bandpass

knob a maximum

6.

Remove the test equipment and connect the

of + /-15

degrees.

duplexer back to the repeater. Check the
plexer for insertion loss according to its specifica-

tions .

o.v~

~

D

Nrtonno

0

Rf

In/Out

v.rt/SrtN>/

DistiDYM

Ext Horiz

Domod

Out

0 0 0 0 0

Hod

Out

Ext Hod

In

re-

du-

FIGURE

5.13-DUPLEXER

REJECT NOTCH ON TRANSMIT LEG

5.16.0 CAVITY
BANDPASS

C. Adjustment

1.

Connect the service monitor's
in-service duplexer as shown in figure 5.13.
connect the cable
that comes from the transmitter. Move the serv­ice

monitor's "RF
duplexer receiver port to the duplexer transmis­sion port. Reconnect the cable coming from the
receiver
receiver PL.

2. Set

"Function" switch to "Gen", "FM", and enter

the receiver frequency.

\ !

RE.ECT

ADJUSTMENT SETUP;

&

DUPLEXER

WITH

REJECT

of

Reject Notch on Transmit Leg

at

to

the duplexer receiver port. Disable the

TUNING

NOTCH

"RF

In/Out"

the duplexer transmitter port

In/Out"

cable from the

to the

Dis-

REJECT

FIGURE

5.14-DESENSITIZATION

TEST SETUP

5.17.0 DESENSITIZATION TEST IN SERVICE
DUPLEXER

Perform this test after retuning a duplexer or after
detecting inadequate isolation between transmitter and
receiver. The following conditions may make a duplexer
appear mistuned:

High VSWR antenna

IM (intermodulation) between repeater's transmit-

ter and an external signal

or

Faulty cables

connectors

Improper cable length or configuration

5-9

Normally, repairing

or

replacing cables solves the prob­lem without retuning. Check the duplexer manufac­turer's data sheets to determine proper installation.

1.

Connect the service monitor to the repeater/du­plexer under test, as shown in figure 5.14. Connect
the

"RF

through

In/Out"

an

RF tap-off isolating device.

to the duplexer's antenna port

CAUTION: To prevent RF overload into the generator,

provide sufficient isolation between the tap-off and the

straight-through feed. For example, a
ter requires

2. Connect the

50

dB isolation.

"Vert!SINAD/Dist" input to the re-

IOOOW

transmit-

ceiver speaker connection. Disconnect the cable
from the

"RF

In/Out"

to prevent the transmitter

from keying up on repeat.

3. Set left LCD to

"Dev", "Function" to "Gen", and

enter the receiver frequency.

4. Set the attenuator to

dB and the

"RF

Vernier"

-60

control to mid-range.

5. Adjust the

"1KHz

Lvl" control to 3.0 kHz

DEVon

the LCD.

6.

Reconnect the cable from "RF
tap-off and enable the transmitter to key-up. For
ample, it may be necessary to provide
PL!DPL

7.

With this generated signal introduced to the RF tap-

deviation for a

PL/DPL

In/Out"

to the RF

0.

75

accessed repeater.

ex-

KHz

off, adjust the signal generator Step attenuator and
the

"RF

Vernier" to the

12

dB SINAD level as in­dicated on the LCD. Note the generator RF Level
on the right.

8.

Disable the transmitter from key-up. Readjust the
signal generator to obtain

12

dB SINAD again.

Note the generator RF level.

12

9. The difference between the RF level for
off

(step

SINAD with the transmitter
the transmitter on (step 7),

is

the amount

8)

dB

and with

of

system

desensitization.

10.

More than 2 dB desensitization may indicate:

defective antenna system

loose shields
transmitter spurs
improper

or

defective duplexer cable

Check them all, before attempting to retune the duplexer.

5-10

SECTION 6

MAINTENANCE

6.1.0

6.1.1

NOTE:

BATTERY

The

following instructions detail the correct

for

battery

I.

Remove
ing bars
bars

2.

Extract the

battery

3.

Place the

Screw in the

bars with the 4 screws

case should now be

4.

Connect

lead to
to ­batteries

The
for

battery

permanent
shipped discharged by law.

I.

Connect

"BATTERY"
The
"EXT

Read

2.
right LCD. A fully charged battery will read 13.6 volts.
Overnight
plished by leaving the unit in
and will fully

kit installation, RTP-4021A. See Figure

and

compartment.

the

on

the

BATTERY

following instructions detail

Prolonged

damage

unit will

DC"

the battery voltage by selecting

KIT

INSTALLATION

and

discard 4 nuts holding

to

the

battery

batteries

Red

battery

center

the

Red

- terminal
other

in series.

CHARGING

charging.

discharge

to

the unit

on

charge

positions.

charging

charge

case.

from

the

and

Black

case in the

screws

removed

attached

lead to

on

end

of

the

the battery. New

to

an

AC

the

rear

in

of

the newly installed battery.

the

battery

Remove

case.

battery

battery

and

with 6 screws.

the + terminal,

one

end

batteries

of

the

power

panel.

either

the

battery
"ON"

leads from the

compartment.

attach

in

step

and

jumper

which places the

the

correct

battery

batteries

source

Turn

the unit

the

"BATTERY"

"BATT"

can

or

the retaining

the retaining

I.

"STANDBY"

procedure

retain-

The

battery

the Black

from +

procedure

can

cause

must be

and

select

"ON".

on

be

accom-

NOTE: If

will be used

5-1.

6.1.2
The

operate
connector
clamp.

to fabricate a mating plug for the male
tor
user to make a
rate

I.

NOTE: Use wire large

significant loss. ie.

The

.110"-.150"

2.

3. With

or

the

NOTE: If

will be used

AC

OPERATION

following instructions detail the

and

at the back

power

Assemble the
pin I to
pin 2 to NC
pin

3

pin 4 to

IR

AWG

20 A

WG

terminals supplied

Select

measure
measurement
between

AC

power

is

connected

rather

the

unit from an external

kit RPX-4097 A consists

four

source

+

to

NC
ground

for up
for up

"EXT

no

AC

the

11

power

FROM

connector

of

DC

connector

(II

to

DC"

applied
External

on

and

is

rather

than

DC

AN

pins.

the

service

power

cable to

to

the

service monitor.

17

VDC)

enough

to

6 feet

to

16 feet

are

on

the

to

the

DC

the

right

17

volts

connected

than

DC

to the unit. the

power.

EXTERNAL

correct

DC

power

of a connector

These

DC

monitor

interconnect

kit RPX-4097 A as follows:

to

carry 6

#18-#14

rear

unit,

voltage using the

LCD.

DC

to

power.

with ins

panel.

turn

This voltage must be

for

proper

the

unit, the

DC

procedure

parts

power

and

amps

the unit

AC

power

SOURCE

to

source.

can be used

enables the

operation.

The

shell,

connec-

a sepa-

with no

diameter

on

"BATT"

AC

power

and

FIGURE

6.1-BATTERY

6-1

INSTALLATION

6.1.3

PACKAGING

Any

time the unit

INSTRUCTIONS

must

be shipped via commercial car­riers, it must be packaged
recommended package for shipping
ping

carton

properly

the unit was delivered in. These boxes when

taped

closed, are designed

damage.

If

the original shipping

RTL-4115~A

also designed

Lacking the a

cardboard

Transit

to

safely cushion

hove. a douhle-hox

with

expanded

cartons

Case

is

highly

plastic filler can he

from available shipping cartons.

to

prevent damage.

is

the original ship-

to

prevent shipping

are

not

available.

recommended

the

unit

in

of

strong.

The

the

and

shipping.

undamaged

fabricated

6.1.4

INSTALLATION

UNITS

IN

THE

INTO

FIELD

EXISTING

The RPX-4309A kit is available on a FIELD
basis for any R-2200 already shipped and installation
simple. Basically, only a screw driver to remove the top
cover, 2 new
4309A

board is all that

allow the unit to include non-volatile memory. RTL-4161A

is

installs

EPROM's

and a, wire must be soldered on the bottom mother

is

in

option module slot A9 which is color coded red.

which are included

required. The wire

is

only necessary to

Insert main software (PIN 5IR80323B05 & 5IR80323B06)
into the appropriate sockets located

in

CPU Board, RTC­4023A. Observe polarity and location when exchanging
software.

R-2200

RETROFIT

is

very

in

the RPX-

NOTE: In the

Motorola

Test
aged condition
will assume

event

Equipment

due

no

liability for

that

to

improper

equipment

Service

packaging.

the

damage.

is

returned

Center

to

in a dam-

Motorola

the

6-2

MOTOROLA,
COMMUNICATIONS
TEST

EQUIPMENT

1313 EAST ALGONQUIN ROAD SCHAUMBURG, ILLINOIS 60196

INC.

SECTOR

SERVICE CENTER EAST

TEST EQUIPMENT SERVICE REQUEST FORM

TEST

EQUIPMENT

2333

SERVICE CENTER WEST

B.

Utah Avenue,

El

Segundo, CA

CUSTOMER'S PURCHASE

MODEL NUMBER I

DESCRIPTION

REQUESTED

OF

PROBLEM:

SERVICE:

This completed
for

service.

ORDER

NO.

I

I

I

form

must

accompany equipment returned

SERIAL NUMBER

DATE

I

I

SHIP

TO ADDRESS:

I

SHIP VIA:

Providing
Equipment Service.

MOTOROLA CUSTOMER NUMBER

1

the

information

below

will

reduce

BILL TAG

the

turnaround

SHIP

TAG

time

on your Test

INTERNAL MOTOROLA ACCOUNT NO.

SIGNED:

__________

_

-

~

'

Q

CJ)

.,

~ ~.

_ n 3

-<~>c:::

-c

0:::::.. - ·

llon

CJ)

,oo

:::::..

)>

(")

ro

o
3

,

:::s

:!.

2!.

---·

""'I

:::s

(/1

z

c

)>

I