Rotronix LC828 User manual

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 1 of 12
Version 01-01
`
LC828 interface -module Manual
RTRNX-GP328-V4

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 2 of 12
Contents
1 SUMMARY: ................................................................................................................................................ 3
2 INTRODUCTION: ...................................................................................................................................... 4
2.1 Associated Motorola Propriety Documentation: ................................................................ ............ 4
2.2 Supported Portable Radios: ................................................................ ............................................ 4
2.3 Publication Record: ................................................................ ........................................................ 4
2.4 Alert Notices: ................................ .................................................................................................. 5
2.5 Contact details: ............................................................................................................................... 5
2.6 Copyright: ....................................................................................................................................... 5
2.7 Abbreviations ................................ .................................................................................................. 6
3 TECHNICAL OUTLINE: .......................................................................................................................... 7
3.0 LC828 interface-module: ................................................................................................................ 7
3.1 Printed Circuit Board (PCB) ................................................................ .......................................... 7
3.2 Connectors: ..................................................................................................................................... 7
3.3 Audio circuit: ................................ .................................................................................................. 7
3.4 Input protection:.............................................................................................................................. 8
3.5 Channel change: ................................................................ ............................................................. 8
4 TECHNICAL DESCRIPTIO N:................................................................................................................. 9
4.0 Connectors: ..................................................................................................................................... 9
4.1 Audio:................................ .............................................................................................................. 9
4.6 Channel switching:........................................................................................................................ 10
4.7 Light Emitting Diodes (LED’s): ................................................................ .................................... 11
4.8 Fuse:................................................................................................................................ .............. 11
5 BILL OF MATERIALS, SCHEM ATICS, PCB LAYOUT: .................................................................. 12

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 3 of 12
1 Summary:
The LC828 interface -module is an interface -board to connect two or
three LC828 (low current transmit/receiver) modules in a repeater or
linking configuration. It provides fused DC-power distribution to the
LC828 radio -module and a twelve position switch to change the
transmit/receive channel of the LC828.
Channel switch
LC828 connectors
Fused power-
supply out
Power-supply
in

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 4 of 12
2 Introduction:
This manual provides information about the LC828 interface -module
and associated electronic circuitry.
2.1 ASSOCIATED MOTOROLA PROPRIETY DOCUMENTATION:
Motorola service manual : (Part No: 6804110J64 -H)
Rotronix LC828_interface Manual
Rotronix DC -DC Converter Manual
2.2 SUPPORTED PORTABLE R ADIOS:
LC828 radio -module, based on the following radio’s:
PRO5150, PRO5350 , GP140, GP318, GP328, GP328 LS,
HT750, HT750.LS, MTX850 LS, HT1250, HT1250.LS+,
MTX8250LS, PRO7150, PRO7350, GP338, GP338 LS,
PRO9150, HT1550XLS
2.3 PUBLICATION RECORD:
Issue
Publication Date
Author
Description
1.01
December 2008
Hans de Roode
First issue

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 5 of 12
2.4 ALERT NOTICES:
Within this manual, four types of alerts are given to the reader:
warning, caution, important and note. The following paragraphs
illustrate each type of alert and its associated symbol.
Warning!!
This alert is used when there is a potential risk of death or serious
injury.
Caution
This alert is used when there is the risk of minor or moderate injury
to people.
Important
This alert is used to warn about the risk of equipment damage or
malfunction.
Note
This alert is u sed to highlight information that is required to ensure
that procedures are performed corr ectly.
2.5 CONTACT DETAILS:
Rotronix Ltd
135 Darnley Road
RD3 Amberley, New Zealand
Commercial e -mail: [e-mail]
Technical e-mail: [e-mail]
2.6 COPYRIGHT:
Copyright protects original works, regardless of whether the
work is published or unpublished. Under the Copyright Act
1994, copyright automatically applies as soon as t he work is
put into material form – whether in print, stored on computer
or recorded in some way. As a signatory to the Berne
convention, New Zealand protects the rights of copyright
owners from other countries in the same way it does for our
own copyright owners. It is unlawful to copy all or part of this
manual without a license or without approval from the
copyright owner, unless there is a statutory exception to such
infringement.

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 6 of 12
2.7 ABBREVIATIONS
Abbreviation
Description
3DK
Third-Party Developer’s Kit
ASCII
American Standard Code for Information Interchange
AVL
Automatic Veh icle Location
CCRI
Computer Controlled Radio Interface
CRC
Cyclic Redundancy Check
CTCSS
Continuous Tone Coded Squelch System
CTS
Clear to Send
DCE
Data Circuit -Terminating Equipment
DCS
Data Carrier System
DTE
Data Terminal Equipment
DTMF
Dual Tone Multi-Frequency
FEC
Forward Error Correction
FFSK
Fast Frequency Shift Keying
GPIO
General Purpose Input/Output
IPN
Internal Part Number
LED
Light-Emitting Diode
MSD
Most Significant Digit
MPPR
Motorola Professional Portable Radio
NMEA
National Marine Electronics Association standard.
Combined electrical and data specification for
communication between marine electronics and GPS
receivers.
IOB
Interface Option Board
PC
Personal Computer
PTT
Press To Talk
PCB
Printed Circuit Board
PROIS
Motorola proprietary Professional Radio Option
Interface Specification
RMC
Recommended Minimum sentence C. NMEA GPS
message type for the minimum recommended
transmit/GPS data.
RTS
Request to Send
Rx
Receive mode
RXD
Receive Data
SDM
Short Data Message
SMC
Switched Mode Converter (12 to 7.5V)
TX
Transmit mode
TXD
Transmit Data
UART
Universal Asynchronous Receiver -Transmitter
XON
Data Transmitter On
XOFF
Data Transmitter Off
ZIF
Zero Insertion Force Connector

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 7 of 12
3 Technical outline :
3.0 LC828 INTERFACE -MODULE:
The LC828 interface -module consists of the following
components :
Printed Circuit Board (PCB)
Connectors
Audio circuit
Input-protection
Channel change electronics
3.1 PRINTED CIRCUIT BOAR D (PCB)
The PCB has Trough-Hole Plating and electrical tracks on the
bottom and top of the PCB, and has the following dimensions:
60 mm wide X 98 mm long.
3.2 CONNECTORS :
The connectors provide interfacing to various external circuits:
J1 to J3:
Connect to the LC828 radio-modules (1 to 3 radios).
J4:
The fused Supply output for auxiliary equipment, e.g. a n
RF power amplifier to boost the TX signal.
J5: Power supply input.
3.3 AUDIO CIRCUIT :
Only one multiplexed wire is used to inter -connect the audio
from/to the radio-modules. No amplification or filtering takes
place.

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 8 of 12
3.4 INPUT PROTECTION :
A Transient diode on the Power-supply input protects the
LC828-module from supply voltage spikes, e.g. a lightning
discharge. If the input voltage exceeds 33 Volt, the Transient
diode starts to conduct, if a reversed voltage is applied then
the Transient diode acts like a normal diode, in both cases it
will blow the fuse (F1.) This diode can dissipate 1500 Watt for
1 mS.
3.5 CHANNEL CHANGE:
A twelve position rotary switch, voltage divider an d a buffer-IC
provide the control -voltage for the LC828 -modules.

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 9 of 12
4 Technical description:
Please refer to circuit diagrams 5.1,5.2 and 5.3 .
4.0 CONNECTORS :
J1 to J3, LC828 Radio Connector:
J1 to J3 are of the type D -shell, 9 pin, socket.
All the pins (except GND) are decoupled by 220nF; the a udio
pins are decoupled by 470pF.
J4 + J5, Power-supply:
4.1 AUDIO:
The TX/RX audio from the connectors J1 to J3 is connected
together, this is possible because the audio -buffer in the
LC828-module have an impedance of 1k Ohm. The audio-line
is decoupled at each connector (J1 – J3) with 470pF.
When a module is added or removed the audio -levels in the
LC828 have to be re -adjusted.
Pin:
Description:
1
GND
2
7.5V (max. 500mA)
3
RX/TX audio
4
3.3V (reference)
5
Channel select input
6
PTT
7
RX busy out
8
Power supply
9
Power supply
shell
GND
Pin:
Description:
1
Power supply
2
GND

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 10 of 12
4.6 CHANNEL SWITCHING:
A voltage on J3.5 will select a channel in the LC828 -module.
The voltage can be in the range of 0 to 3.3 Volts (J3.4). The
maximum number of channels depends on the radio -model,
the number of channels programmed in the radio and the
software in the IOB . The current version supports maximum
ten channels. Cha nnel selection is according to the following
Channel-voltage list:
Channel:
Voltage:
1
3.3
2
3
3
2.7
4
2.4
5
2.1
6
1.8
7
1.5
8
1.2
9
0.9
10
0.6
2
0
The internal reference voltage from the LC828 radio -module is
buffered by IC1A and used by the rotary-switch to produce the
required voltage.
R1a to R3a select which LC828 radio -module’s reference
voltage (3.3V) is used for the channel -change circuit , place
only one resistor (mutually exclusive .) according to the
following table.
LC828:
Resistor:
J1
R1a
J2
R2a
J3
R3a
R5 to R14 make a voltage divider according to the channel -
voltage list. The voltage selected by the twelve position rotary
switch is buffered by IC1B and fed to pin J1 -3.5 of the LC8282
radio-modules. IC1 receives its power-supply from the 7.5
Volt from the three paralleled outputs of the LC828 radio -
module (J1-3.2.)

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 11 of 12
4.7 Light Emitting Diodes (LED’S):
The PCB provides for four LED’s, three are optional and
depend on programming/ jumper -settings of the IOB in the
LC8282 radio -modules; they provide the same functionality as
the LED on the LC8282 radio -modules.
LC828 (pin 4):
LED:
J1
D1
J2
D2
J3
D3
LED D4 is used to indicate the presence of 7.5 Volt from the
three paralleled outputs of the LC828 radio -module (J1-3.2.)
If a LC8282 radio-module is selected to supply the reference
voltage to the channel -select circuit then the LED cannot be
used.
4.8 FUSE:
Fuse F1 prevents the flow of high currents for a long time, and
therefore also the overheating and permanent damage of the
electric circuit it is protecting .
It is imperative that the right value fuse is used.
For normal use, a 6 Amp fuse is sufficient if auxiliary
equipment is used, the value can be increased to 10 Amp.
The fuse-value should not exceed 15 Amp!
Either a fuse of the type “slow -blow” or “fast -blow” can be
used.

LC828 Interface ( RTRNX-GP328-V4) Manual Board Manual Page 12 of 12
5 Bill of materials , Schematics, PCB layout :
Designator
LibRef
Description
Footprint
Comment
C1
CAP
Capacitor
0805
220n
C2
CAP
Capacitor
0805
220n
C3
CAP
Capacitor
0805
220n
C4
CAP
Capacitor
0805
220n
C5
CAP
Capacitor
0805
220n
C6
CAP
Capacitor
0805
220n
C7
CAP
Capacitor
0805
220n
C8
CAP
Capacitor
0805
220n
C9
CAP
Capacitor
0805
220n
C10
CAP
Capacitor
0805
220n
C11
CAP
Capacitor
0805
220n
C12
CAP
Capacitor
0805
220n
C13
CAP
Capacitor
0805
220n
C14
CAP
Capacitor
0805
220n
C15
CAP
Capacitor
0805
220n
C16
CAP
Capacitor
0805
220n
C17
CAP
Capacitor
0805
470pf
C18
CAP
Capacitor
0805
220n
C19
CAP
Capacitor
0805
220n
C20
CAP
Capacitor
0805
470pf
C21
CAP
Capacitor
0805
470pf
C22
CAP
Capacitor
0805
220n
C23
CAP
Capacitor
0805
220n
C24
CAP
Capacitor
0805
220n
C25
CAP
Capacitor
0805
220n
D1
LED
0805
led
D2
LED
0805
led
D3
LED
0805
led
D4
LED
0805
led
D6
TRANZORB
transil
TRANZORB
F1
FUSE1
Fuse
FUSE
FUSE1
J1
CON9
Connector
DB9RA/F
CON10
J2
CON9
Connector
DB9RA/F
CON10
J3
CON9
Connector
DB9RA/F
CON10
J4
CON2
Connector
CON5569-2
CON2
J5
CON2
Connector
CON5569-2
CON2
R1
RES1
0805
560e
R1a
RES1
0805
0E
R2
RES1
0805
560e
R2a
RES1
0805
0E
R3
RES1
0805
560e
R3a
RES1
0805
0E
R4
RES1
0805
560e
R5
RES1
0805
4k7
R6
RES1
0805
4k7
R7
RES1
0805
4k7
R8
RES1
0805
4k7
R9
RES1
0805
4k7
R10
RES1
0805
4k7
R11
RES1
0805
4k7
R12
RES1
0805
4k7
R13
RES1
0805
4k7
R14
RES1
0805
4k7
S1
SW-
12WAY
sw-12p-ck1049
SW-12WAY
TLV2452AID
385
SO-8
IC1A

1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
B
Date: 15/12/2008 Sheet of
File: C:\99SE\..\ChannelSwitchver2.sch Drawn By:
GND
11-25V
1
2
3
4
5
6
7
8
9
CON10
J1
470pf
C17
220n
C18
220n
C3
220n
C5
220n
C7
220n
C9
1 2
CON2
J4
GND
220n
C2
GND
GND
7V5
TX/RXaudio
3.3V
Channel
PTT
RXbusy
PSU
PSU
GND
11-25V
1
2
3
4
5
6
7
8
9
CON10
J2
470pf
C20
220n
C19
220n
C4
220n
C6
220n
C8
220n
C10
GND
220n
C11
GND
GND
7V5
TX/RXaudio
3.3V
Channel
PTT
RXbusy
PSU
PSU
GND
11-25V
1
2
3
4
5
6
7
8
9
CON10
J3
470pf
C21
220n
C22
220n
C13
220n
C14
220n
C15
220n
C16
220n
C12
GND
GND
7V5
TX/RXaudio
3.3V
Channel
PTT
RXbusy
PSU
PSU
TXradio
forlink
TXRXfor
bi
directional
RXradio
forlink
TXRXfor
bi
directional
TXRX
forlink
SW-12WAY
S1
led
D2 led D4
led
D3
led
D1
560e
R1 560e R2 560e R3 560e R4
220n
C1
GND
LC828 interface-module
V-04/00
0/0
1 of1
Hans de Roode
FUSE1
F1
TRANZORB
D6
GND
1
2
CON2
J5
12V toPA
12Vinput
GND
GND
4k7
R14
4k7
R13
4k7
R12
4k7
R11
4k7
R10
4k7
R9
4k7
R8
4k7
R7
4k7
R6
4k7
R5
0E
R1a 0E R2a 0E R3a
-
2
+
31
8
IC1A
TLV2452AIDA
-
6
+
57
4
IC1B
TLV2452AIDB
220n
C23
GND
220n
C25
GND
220n
C24
GND
RTRNX-GP328-V4