Maxon SP5050 DTMF installation manual

LBI-39061A

Installation Manual

DTMF Encoder
344A4209P23 (MHDE5U)

ericssonz

TABLE OF CONTENTS

Page

INTRODUCTION...................................................3

GENERAL DESCRIPTION.................................3

PROGRAMMING................................................3

THEORY OF OPERATION....................................3

INSTALLATION AND ALIGNMENT.......................4

10 CHANNEL VERSION ....................................4

4/16 CHANNEL VERSION .................................8

PARTS LIST ..........................................................12

SCHEMATIC DIAGRAM........................................14

NOTICE!

This manual covers Ericsson and General Electric

products manufactured and sold by Ericsson Inc.

This manual is published by
to this manual necessitated by typographical errors, inaccuracies of current information, or
improvements to programs and/or equipment, may be made by
without notice. Such changes will be incorporated into new editions of this manual. No part of
this manual may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, for any purpose, without the express
written permission of

Coriht © A

ril 1994

Ericsson Inc.

Ericsson Inc.

Ericsson GE Mobile Communications Inc.

, without any warranty. Improvements and changes

Ericsson Inc.

, at any time and

2

INTRODUCTION

GENERAL DESCRIPTION

The Dual-Tone Multi-frequency (DTMF) encoder

allows DTMF operation in the
Portables.

When installed, the DTMF encoder will provide the

radio with ability to use all of the combinations found on
the DTMF keypad.

PROGRAMMING

Programming of the DTMF encoder is not neces sary

or required.

THEORY OF OPERATION

All tone frequency generation is provided by U2. U2

is a standard generic 5098 DTMF encoder device
commonly used in telephone circuitry. Internally the
device contains a crystal oscillator which operated on

3.579 MHz (commonly known as the clock), two
programmable down-counters which divide the clock
output frequencies to provide DTMF tones which are
added together when a keypad button is depressed. The
resulting sine wave output is enabled by either the XMIT
ENABLE or it's inverse.

Monogram™ Series

The speaker output provides an amplitude which

may be heard on the speaker.

3

The DTMF OUTPUT is adjustable with R8 and

routed to the audio input within the radio.

A regulated 5.0 VDC source for U2 is provided by

U1. Beyond the regulator, decoupling capacitors are
provided to keep RF out of the circuit.

INSTALLATION AND ALIGNMENT

NOTE

The installation and alignment instructions assume
the radio has been properly programmed, aligned and
deviati on cor rec tl y set pri or t o the i ncor pora ti on of t he
DTMF option.

10 CHANNEL VERSION

1. Remove the battery.

2. Remove the two front cover retaining screws from
the bottom of the unit as shown in Figure 1.

3. Remove the front cover and disconnect the 4-pin
plug from CON 406.

NOTE

Retain the front cover and screws for future use or as
a source of replacement parts.

4

Figure 1 - Bottom of Radio

4. Remove solder jumper from LK7.

5. Add solder jumper to LK6.

6. Remove the solder jumper from LK3 and install the
supplied 10K ohm resistor (R29/060-103-8Z) in its
place.

7. Add the supplied 470 pF chip capacitor (R29/134­711-9) to the trace at the lower portion of LK3 as
shown.

NOTE

Instal lation of the 470 pF chip c apacitor requires the
removal of the soldermask from the printed wiring
board. USE CAUTION WHILE REMOVING TO
AVOID DAMAGING THE PRINTED WI RING BOARD
TRACES.

5

Figure 2 - Radio Printed Wiring Board Layout

(10 Channel Version)

6

8. Connect the DTMF encoder 14-pin interface
connector to CON 404.

9. Connect the 4-pin speaker and microphone
connector to CON 406.

10. Apply B+ (10.8 VDC) to battery terminals using a
battery or power supply.

11. Connect the RF output to a service monitor or
modulation analyzer using appropriate attenuators as
required.

12. Set the High/Low Power selector to High.

NOTE

If your
over a wide ran ge of f requenci es, selec t a fr equency
in or near the center of the frequency range for
making the deviation adjustment. Accordingly, if the
DTMF encoder will be used only on one channel , t he
alignment should be performed on that channel for
best performance.

13. Place the unit in transmit while depressing the “5”
key and adjust R8 for 3 kHz ±100 Hz deviation.

Monogram

Series

portable is programmed

14. Depress the "1" and "#" keys and verify that the
deviation is 3 kHz ±500 Hz.

7

15. Place the front cover into the proper position. Use
care to avoid damaging wires when affixing the front
cover.

16. Secure the cover by using the two screws (R29/600-

757) supplied in the MHDE5U kit in the botton of the
unit as shown in Figure 1. DO NOT OVERTIGHTEN.

4/16 CHANNEL VERSION

1. Remove the battery.

2. Remove the two front cover retaining screws from
the bottom of the unit as shown in Figure 1.

3. Remove the front cover and disconnect the 4-pin
plug from CON 406.

NOTE

Retain the front cover and screws for future use or as
a source of replacement parts.

4. On DTMF board install a jumper short access
capacitor C13 (2.2 µF tantalum).

5. On the 14-pin Molex Option Interface PCB, cut pad
between pins 13 and 14 and pattern between pin 14
and the Molex pad. Install a jumper f rom pin 13 to
Molex pad. Refer to Figure 3.

8

Before Modification After Modification

Figure 3 - 14-Pin Molex Option Interface PCB

NOTE

Current production of the 14-pin Molex Option
Interf ace PCB has the pad between pins 13 and 14
cut and the trace bet ween pin 14 and t he Molex pad
cut. However, a jumper must be installed from pin 13
to the Molex pad. Refer to Figure 3.

6. Add solder jumper at LK6, LK14 and LK19 (see
Figure 4).

7. Remove solder jumper at LK7 and LK20 (see
Figure 4).

9

Figure 4 - Radio Printed Wiring Board Layout

(4/16 Channel Version)

10

8. Connect the DTMF encoder 14-pin interface
connector to CON 404.

9. Connect the 4-pin speaker and microphone
connector to CON 406.

10. Apply B+ (10.8 VDC) to battery terminals using a
battery or power supply.

11. Connect the RF output to a service monitor or
modulation analyzer using appropriate attenuators as
required.

12. Set the High/Low Power selector to High.

NOTE

If your
over a wide ran ge of f requenci es, selec t a fr equency
in or near the center of the frequency range for
making the deviation adjustment. Accordingly, if the
DTMF encoder will be used only on one channel , t he
alignment should be performed on that channel for
best performance.

13. Place the unit in transmit while depressing the “5”
key and adjust R8 for 3 kHz ±100 Hz deviation.

Monogram

Series

portable is programmed

14. Depress the "1" and "#" keys and verify that the
deviation is 3 kHz ±500 Hz.

11

15. Place the front cover into the proper position. Use
care to avoid damaging wires when affixing the front
cover.

16. Secure the cover by using the two screws (R29/600-

757) supplied in the MHDE5U kit in the botton of the
unit as shown in Figure 1. DO NOT OVERTIGHTEN.

PARTS LIST

DTMF ENCODER

344A4209P23 (MHDE5U)

SYMBOL PART NO. DESCRIPTION

C1 R29/141-014-1 Capacitor, tantalum: 1 µF
C2 R29/130-172-2 Capacitor: 0.01 µF
C3 R29/134-726-3 Capacitor: 470 pF
C4 R29/141-014-1 Capacitor, tantalum: 1 µF
C5 R29/130-172-2 Capacitor: 0.01 µF
C6 R29/134-726-3 Capacitor: 470 pF
C7 thruC9R29/134-772-1 Capacitor: 47 pF

C10 R29/132-220-2 Capacitor: 220 pF
C11 R29/130-172-2 Capacitor: 0.01 µF
C12 R29/141-014-1 Capacitor, tantalum: 1 µF
C13 A29/142-201-8 Capacitor, tantalum: 2.2 µF
CR1 thru
CR4
R1 andR2R29/060-470-9 Resistor: 47 ohm

R29/999-073-2 Diode, LED: Red, SLM-13VW

ISSUE 1

DTMF BOARD

R3 R29/060-513-5 Resistor: 51K ohms
R4 andR5R29-060-103-8Z Resistor: 10K ohms

R6 R29/060-104-9Z Resistor: 100K ohms

12

SYMBOL PART NO. DESCRIPTION

R7 R29/060-100-5 Resistor: 10 ohm
R8 R29/073-501-2 Resistor, semi-fixed: 500 ohm
R9 R29/060-474-3 Resistor: 470K ohms
Q1 thruQ3R29/218-018-2 Transistor: sim to MMBT 3904

X1 R29/260-148-1 Crystal: 3.579645 MHz
U1 R29/223-119-8 IC: sim to LM 78L05
U2 R29/999-068-1 IC: sim to TCM5089

R29/718-849 Cover, N190J 2032
R29/999-084-0 Molex Connector
R29/999-114-0 Interconnect PCB
R29/628-060 Screw, PH 1.7x4-2S (Quantity 4)
R29/420-112-4 Speaker
R29/420-206-0 Microphone, WM-063AT
R29/504-916 4-Pin wiring assembly
R29/723-776 Bracket, speaker
R29/850-924 Bushing, microphone
R29/894-600 Gasket
R29/906-369 Felt, speaker
R29/621-460 Screw, speaker bracket 2.6x5-2S

R29/894-884-A Keypad, silicon rubber

R29/060-103-8Z Resistor: 10K ohms
R29/134-711-9 Capacitor: 470 pF
R29/600-757 Screw: FH 2-56x7 (Quantity 2)

MISCELLENOUS

(Quantity 2)
THE FOLLOWING PARTS ARE

PROVIDED IN KIT FOR
INSTALLATION OF MHDE5U.

13

14

NOTES:

15

Ericsson Inc.

Private Radio Systems
Mountain View Road
Lynchburg, Virginia 24502
1-800-528-7711
(Outside USA, 804-528-7711) Printed in U.S.A.