Multitone Electronics PLC RPE673 Multitone RPE673 Radio Paging Transcoder User Manual Prelim

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Document Title	Prelim.
Document Creator	RPT 633 Issue 1

RPT 633
TECHNICAL MANUAL
for
UHF TRANSMITTER
MODEL RPT 633
and
UHF SERIAL ENCODER
MODEL RPE 673
Printed and published in England
TM1184 Issue 1 AL1 (May 1997)
Page (i)
RPT 633
COMPANY LIABILITY
The information in this manual has been carefully compiled and checked for technical
accuracy. Multitone Electronics plc accept no liability for inaccuracies or errors. In line with
the company policy of technical advancement, the information within this document may be
changed. The user should ensure that the correct issue of the document is used.
Comments or correspondence regarding this manual should be addressed to:
Multitone Electronics plc
Technical Publications
Multitone House
Beggarwood Lane
Kempshott Hill
Basingstoke
Hampshire
RG23 7LL
England
ISSUE
DATE
April 1994
© Multitone Electronics plc 1997
Page (ii)
TM1184 Issue 1 AL1 (May 1997)
RPT 633
CONTENTS
Page (i)
Title Page
Page (ii)
Company Liability
Page (iii)
Contents
Page (iv)
Effective Page List
Page (v)
Safety Summary
Warning
Page (vi)
Cautions
Section 1
Introduction and Specification
Section 2
Operating Instructions
Section 3
Technical Description
Section 4
Installation and Commissioning
Section 5
Servicing
Section 6
Spare Parts List
Section 7
Diagrams
Appendix 1
UHF Serial Encoder Model RPE 673
TM1184 Issue 1 AL1 (May 1997)
Page (iii)
RPT 633
EFFECTIVE PAGE LIST
Page No.
Issue
Page No.
Issue
Page No.
Issue
(i)
(ii)
1 AL1
1 AL1
4-5
4-6
7-11
(iii)
(iv)
1 AL1
1 AL1
5-1
5-2
A1-1
A1-2
1 AL1
1 AL1
(v)
(vi)
5-3
5-4
A1-3
A1-4
1 AL1
1 AL1
1-1
1-2
1 AL1
5-5
5-6
A1-5
A1-6
1 AL1
1 AL1
1-3
1-4
5-7
5-8
A1-7
A1-8
1 AL1
1 AL1
2-1
2-2
5-9
5-10
A1-9
A1-10
1 AL1
1 AL1
3-1
3-2
6-1
6-2
A1-11
A1-12
1 AL1
1 AL1
3-3
3-4
6-3
6-4
A1-13
A1-14
1 AL1
1 AL1
3-5
3-6
6-5
6-6
A1-15
A1-16
1 AL1
1 AL1
3-7
3-8
6-7
6-8
A1-17
A1-18
1 AL1
1 AL1
3-9
3-10
7-1
7-2
A1-19
A1-20
1 AL1
1 AL1
4-1
4-2
7-3/4
7-5/6
A1-21
A1-22
1 AL1
1 AL1
4-3
4-4
7-7/8
7-9/10
A1-23
A1-24
1 AL1
1 AL1
Page (iv)
TM1184 Issue 1 AL1 (May 1997)
RPT 633
SAFETY SUMMARY
The following information applies to both operating and servicing personnel. General
Warnings and Cautions will be found throughout the manual where they apply.
WARNING statements identify conditions or practices that could result in personal injury or
loss of life.
CAUTION statements identify conditions or practices that could result in equipment damage.
WARNING
GREAT CARE MUST BE TAKEN TO AVOID BREAKING OPEN THE
ENCAPSULATION OF TR10 ON THE TRANSMITTER BOARD WHEN REPAIR OR
COMPONENT REPLACEMENT IS BEING CARRIED OUT, AS THIS COMPONENT
CONTAINS TOXIC BERYLLIUM OXIDE.
TM 1184 Issue 1
(v)
RPT 633
CAUTIONS
DO NOT MOUNT OVER A HEATER OR RADIATOR, OR IN DIRECT SUNLIGHT AND
ENSURE A DRY ENVIRONMENT.
STATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT. CARE MUST BE
TAKEN TO ENSURE DAMAGE TO THESE DEVICES IS NOT CAUSED BY HIGH LEVELS
OF STATIC ELECTRICITY. SPARE BOARDS OR COMPONENTS SHOULD BE STORED
IN ANTI-STATIC PACKAGING WHEN NOT INSTALLED IN THE EQUIPMENT.
(vi)
TM 1184 Issue 1
RPT 633
SECTION 1
INTRODUCTION AND SPECIFICATION
CONTENTS:
1.
INTRODUCTION
2.
ROLE OF THE TRANSMITTER
4.
PHYSICAL CONSTRUCTION
5.
6.
7.
8.
9.
SPECIFICATIONS
Transmitter
Connectors
Physical Characteristics
Operational Enviroment
Power Supply
10. CRYSTAL FREQUENCY CALCULATION
_______________________
INTRODUCTION
1.
Sections 1 to 7 of this manual outline the installation and operation of the Radio
Paging Transmitter model RPT 633. Appendix 1 details the Serial Encoder model RPE
673 and provides appropriate cross references to the main part of this manual
(Sections 1 to 7) where functionality is common.
ROLE OF THE TRANSMITTER
2.
The transmitter is designed for operation with the RPE 340-series of telephone coupled
encoders, or from the encoder output of the Access 3000, which together provide radio
coverage with speech for smaller sites. The RPT 633 operates in the UHF band
(420MHz to 470MHz), divided into three sub-bands, and has an output of 2.5 Watts.
3.
Digital control reduces the wiring between the encoder and transmitter to a single pair
for tone and display systems. A four wire connection is required for speech systems.
TM1184 Issue 1 AL1 (May 1997)
Page 1 - 1
RPT 633
PHYSICAL CONSTRUCTION
4.
The transmitter consists of two boards, a transmitter board mounted in the base
assembly and a VOX keying module mounted in the cover assembly.
SPECIFICATIONS
Transmitter
5.
The following describes the performance and physical characteristics of the RPT 633
UHF transmitter:
a)
Frequency Range:
420MHz to 470MHz
b)
Frequency Bands:
Band 1
Band 2
Band 3
c)
Channel Spacing:
Factory set to 10kHz, 12.5kHz, 20kHz
or 25kHz
d)
Frequency Stability
420MHz to 424.99MHz
425MHz to 446.99MHz
447MHz to 470MHz
(normal):
±5ppm from -10EC to +55EC
(high stability):
±1.5ppm from -10EC to +55EC
±2ppm from -25EC to +55EC
±2.5ppm from -30EC to +60EC
e)
Output Power:
2.5W ±1dB
f)
Duty Cycle:
50% (Max transmit time 2.5 minutes)
g)
Nominal Load Impedance:
50 Ohms
h)
VSWR Protection:
Protection against short term removal
of antenna (maximum of five calls with
antenna disconnected).
Connectors
6.
The following connectors are mounted on the transmitter board:
a)
PSU
- SK3:
2.1mm jack socket
b)
Digital
- SK2:
2-way modular keyed connector
c)
Analogue
- SK1:
2-way modular keyed connector
d)
RF
- SK4:
TNC socket
Page 1 - 2
TM 1184 Issue 1
RPT 633
Physical Characteristics
7.
The dimensions and weight of the transmitter are as follows:
a)
Overall Dimensions:
Width
Depth
Height
235mm (9.5in.)
210mm (8.3in.)
90mm (3.6in.)
b)
Weight (Excluding PSU):
1.2kg (2.65lbs.)
Operational Environment
8.
The environmental characteristics of the transmitter are as follows:
a)
Temperature Range:
Operational -10EC to +50EC
b)
Humidity:
0-90% RH (non-condensing)
c)
Altitude:
Up to 2000 metres
Power Supply
9.
17V 0.8A DC Nominal supplies from Multitone Power Supplies:
0301-0605 240V (UK)
0301-0606 220V (EURO)
0301-0607 110V (US)
CRYSTAL FREQUENCY CALCULATION
10. To calculate the carrier crystal frequency the following formula should be used:
Crystal Frequency = Operating Frequency
Where A = 56 for Band 3
or
A = 48 for Bands 1 and 2
TM 1184 Issue 1
Page 1 - 3
RPT 633
INTENTIONALLY BLANK
Page 1 - 4
TM 1184 Issue 1
RPT 633
SECTION 2
OPERATING INSTRUCTIONS
The transmitter is fully automatic in use and operation is limited to switching on the mains
supply.
TM1184 Issue 1
Page 2 - 1
RPT 633
INTENTIONALLY BLANK
Page 2 - 2
TM1184 Issue 1
RPT 633
SECTION 3
TECHNICAL DESCRIPTION
CONTENTS:
1.
INTRODUCTION
2.
3.
5.
6.
7.
8.
9.
10.
11.
13.
14.
15.
16.
TRANSMITTER
Power Supplies
Mode Select Circuit
Audio Input
Data Input
Crystal Oscillator
High Stability Version
Voltage Controlled Oscillator (VCO)
Phase Locked Loop (PLL)
Transmitter Keying
Frequency Multiplier
Band Pass Filter
Driver Stages
Output Amplifier
17.
18.
19.
20.
VOX KEYING MODULE
General
Analogue Path
Data Mode
Decoding
21.
22.
23.
24.
29.
OPERATION
General
Power Up
Data Path
Switching to Speech
Switching from Speech to Data
TABLES
1.
VOX Keying and Mode Signals
TM1184 Issue 1
Page
3-7
Page 3 - 1
RPT 633
CONTENTS: (Continued)
FIGURES
1.
2.
3.
4.
5.
6.
Page
Block Diagram
Module Interconnection Diagram
Speech Call
Open Channel Speech
Switching Into Speech
Switching From Speech
3-2
3-6
3-8
3-8
3-9
3-10
_______________________
INTRODUCTION
1.
The RPT 633 Transmitter accepts analogue or digital information which is
modulated onto an UHF signal. The transmitter output frequency is produced by
doubling the frequency of a voltage controlled oscillator (VCO). The VCO is locked
to a reference crystal oscillator which is frequency modulated by either the Data or
Audio input signals. A basic block diagram is shown at Figure 1.
ANALOGUE INPUT
SPEECH
CIRCUIT
PLL
CIRCUIT
DIGITAL
INPUT
VOX
KEYING
MODULE
MODE
DATA
Tx KEY
RF
CIRCUIT
DATA
CIRCUIT
PSG/10280-1
Figure 1: Block Diagram
TRANSMITTER
Power Supplies
2.
A nominal 17V DC power supply is fed into the board at SK3 where it is filtered
by L14, L15, L16, C67 and C68. Fixed voltage regulators IC3 and IC4 provide 12V
for the transmitter circuit and output transistor respectively, while regulator IC5
produces 5V for the transmitter and VOX Keying module. Integrated circuit IC2
produces 8.2V for the VCO and buffer amplifiers and IC11 acts as a voltage
converter to produce -11V from a 12V input.
Page 3 - 2
TM1184 Issue 1
RPT 633
Mode Select Circuit
3.
With the mode input at 5V the Speech mode is selected. The output of IC6d is low,
inhibiting the passage of Data by shorting the data path to 0V via D11 and
enabling the passage of Audio by forward biasing D9. Variable resistor RV3
together with R102, R103, R108 and R116 hold the output of IC12d at
approximately 0V, which in turn sets the voltage on varactor diode D8 to give the
nominal carrier frequency of the transmitter.
4.
With the mode input at 0V the Data mode is selected and the output of IC6d goes
high, inhibiting the audio path by reverse biasing D9 and allowing data to pass
from IC6b to IC6a.
Audio Input
5.
The audio input is amplified and pre-emphasised by IC13b before passing through
the audio gate D9 to the limiting amplifier IC13a, the output of which is limited to
approximately 10V peak to peak. After limiting, the maximum speech deviation is
set by RV4. The signal is then passed to TR12, IC10b and associated components,
which form a modified 0.4dB four section Chebyshev Filter, which has a cut off
frequency of 2.6kHz and a modified frequency response to give an approximate
2dB lift at 2.55kHz. This compensates for the fall off in deviation caused by the
characteristics of the phase locked loop. Filtered audio passes through summing
amplifier IC10a and unity gain buffer IC10d to modulating varactor diode D8.
Summing amplifier IC10a also superimposes the audio signal onto the DC voltage
produced by IC12b.
Data Input
6.
Input data may be selected to either pass through IC6c, which inverts it, or bypass
IC6c depending on the setting of data polarity selector link LK3. The data passes
through IC6b and IC6a, the output of which switches between being high impedance
or low impedance to 0V. The frequency of the crystal oscillator does not vary
linearly with the voltage on D8 so the values of resistors R102, R103, R108, R116
and RV5 have been chosen to give a voltage swing, at the output of IC12d, of
approximately +3V to -4.8V as the voltage on the input of IC6b switches between
0V and 5V. The data signal then passes through IC12a, IC12b and associated
components, which form a fourth order Bessel filter, which give the data edges a
controlled risetime of 250µs. After filtering, the signal passes through IC10a and
IC10d to varactor diode D8, RV2 being used to set the data deviation level. The
whole of this modulation path is DC coupled so that a constant logic level on the
input produces a constant deviation of the output frequency.
TM1184 Issue 1
Page 3 - 3
RPT 633
Crystal Oscillator
7.
The reference oscillator TR11 is of the crystal controlled Colpitts type, operating on
the fundamental frequency of the crystal which is 1/48th of the output frequency for
Bands 1 and 2 and 1/56th of the output frequency for Band 3. The oscillator
frequency is trimmed by VC5. Varactor Diode D8 provides the modulation, The
capacitance of the diode, and therefore the oscillator frequency varies with the
voltage across the diode. The output of the oscillator is buffered by IC8b.
High Stability Version
8.
On the high stability version a temperature controlled crystal oven OV1 is fitted
which covers the special high temperature crystal.
Voltage Controlled Oscillator (VCO)
9.
Transistor TR2 is a Colpitts oscillator running at half the carrier frequency, the
frequency being determined by L1, C4, C5, C6 and the capacitance of the dual
varactor diode D1. The output of the oscillator is buffered by IC1 and TR4.
Phase Locked Loop (PLL)
10.
The VCO output frequency from TR4 is divided by 256 in IC9 and then buffered by
linear amplifiers IC8c and IC8d before being fed to IC7. Within IC7 the signal is
further divided by either 6 (for output frequencies less than 447Mhz) or by 7 by a
programmable divider, the division ratio being set by shorting link LK2, 1-2 equals
divide-by-6 and 2-3 equals divide-by-7. Also, within IC7, the crystal oscillator
frequency is divided by 64 before being fed, together with the VCO signal, to a
phase/ frequency comparator. E.g. for a carrier frequency of 448MHz the crystal
oscillator frequency is 8MHz which gives an input to the comparator of 125kHz. The
VCO is running at 224MHz which is divided by IC9 to give 875kHz and then by IC7
(LK2 2-3) to give 125kHz. The PLL control output is fed out of IC7 at pin 13 and
via loop filter R47, R48, C69, and C70 to the VCO. The filter controls the dynamic
behaviour of the loop, the modulation frequency response and the level of the PLL
reference frequency sidebands. When the PLL has achieved lock it sends a high
in-lock signal from IC7 pin 12, via delay circuit R49, R50, C71 and D5, the buffers
IC8a and IC8f, to forward bias TR5 and TR8. D5 allows C71 to discharge quickly
when the lock fail condition occurs and to charge slowly when the in-lock condition
is restored.
Page 3 - 4
TM1184 Issue 1
RPT 633
Transmitter Keying
11.
Normal transmitter keying is achieved by fitting a shorting link across LK1 pins 2-3.
In the quiescent state the Tx Key line is at 5V, the output of IC6f is at 0V and the
bias voltages of TR5 and TR8 are shorted to 0V. When the VOX keying module
sets the Tx Key command to logic low the output of IC6f goes high impedance.
Forward bias is applied to TR5 and TR8 providing the PLL is in lock.
12.
Provision has been made for an alternative method of keying the transmitter which
keys the VCO off when the transmitter is not in use, thus removing any carrier
components in the standby mode. This is achieved by fitting LK1 pins 1-2. A 0V
signal on the Tx Key line then turns on TR3, via inverter IC6f, which in turn turns on
TR1 and supplies 8.2V to the VCO transistor TR2.
Frequency Multiplier
13.
Transformer T1, enabled by the in-lock signal turning on TR5, provides a balanced
feed to the multiplier diodes D3 and D4 which pass the desired transmit output
frequency and reject the fundamental frequency and odd harmonics of it. The
desired frequency is passed to TR6 for amplification
Band Pass Filter
14.
This is made up of two cascaded two-section helical filters FL1 and FL2. The filters
reject any VCO leakage and any unwanted frequencies generated by the
multiplication process.
Driver Stages
15.
Transistors TR7, TR8, TR9 amplify the filtered signal up to a level of approximately
250mW, inter stage matching being optimised by VC1 and VC2. The output power
from TR9 and ultimately the output power of the transmitter, is controlled by RV1,
while the bias for TR8 is controlled by the keying line ensuring a high attenuation
of the output signal when the transmitter is keyed off.
Output Amplifier
16.
Matching between TR9 and TR10, operating as a class C amplifier, is optimised
by VC3. The output of TR10 is matched to the output filter by C50, C51 and a
length of micro-strip line, the filter being formed by C53 to C60 and the micro-strip
lines. Any harmonics of the output frequency are attenuated by the filter and any
residual VCO signal is attenuated by VC4 and L13. The output power at SK4 is
2.5W.
TM1184 Issue 1
Page 3 - 5
RPT 633
VOX KEYING MODULE
General
17.
The VOX keying module decodes encoder presented serial data and controls the
transmitter. Interconnection between the Transmitter PCB and VOX Keying PCB is
as shown in Figure 2.
Figure 2: Module Interconnection Diagram
Analogue Path
18.
Analogue signals are input via external connector SK1 of the transmitter PCB and
internal connectors TL8 and TL9. The level is adjusted via RV1 (VOX keying
module PCB) and output is via connectors TL1 and TL2 to the speech input of the
transmitter PCB. This presents the correct audio level to the transmitter modulation
circuits.
Data Mode
19.
Data signals are input via external connector SK2 of the transmitter PCB, buffered
by TR14 and then fed, via the internal connector PL1-4, to the VOX keying module.
Page 3 - 6
TM1184 Issue 1
RPT 633
Decoding
20.
The VOX keying module decodes the incoming encoder serial data into the two
logic signals shown in Table 1.
Table 1: VOX Keying and Mode Signals
NOTE: Tx KEY is active low.
Tx KEY
(PL1-2)
MODE
(PL1-3)
TRANSMITTER
STATE
Low
Low
High
Low
High
Low/High
Data Mode
Speech Mode
Off
OPERATION
General
21.
Components IC1a and IC1b are negative edge retriggerable monostables having
output pulse widths of 4.5ms (OA) for the Mode signal and 2ms (OB) for the CLK
signals to IC2. TR1 and associated components are not used in these transmitters
and are therefore by-passed via LK1 and LK2.
Power-Up
22.
At power-up R4 and C5 hold IC2 CLR input low. This causes IC2 pin 3 (QC) to
route a low signal to IC3-6. Integrated circuit IC1a-6 routes a low signal to IC3-5,
which results in the Tx Key signal at PL1-2 remaining high and holding the
transmitter keyed off.
Data Path
23.
To key the VOX keying module for data mode, the incoming data stream, via PL14, LK1, LK2, TP2 to IC1a-5, retriggers IC1a for the duration of the data. IC1a-7
routes a low Mode signal via PL1-3 to set the transmitter into data mode whenever
data is present. Integrated circuit IC1a-6 (OA) routes a high signal to IC3-5. This
results in a low Tx Key signal via LK4 illuminating D3 and, via
PL1-2, Keying
on the transmitter.
TM1184 Issue 1
Page 3 - 7
RPT 633
Switching to Speech
24.
To switch into the speech mode, either as part of a speech paging call or for open
channel speech, the encoder generates two 1ms pulses 4ms apart as shown in
Figures 3 and 4.
Figure 3: Speech Call
Figure 4: Open Channel Speech
25.
The pulses are inverted at PL1-4 and the leading edge of the first pulse results in
IC1-6 (OA) going high which switches PL1-2 low for 4.5ms (see Figure 3). The
trailing edge of the first pulse results in IC1-7 and IC3-1 presenting two lows to IC312 and IC3-11 respectively, so that IC2-1 goes high. This has no immediate effect
on the circuit since the resetting of IC1a after 4.5ms removes one of the two low
states which caused J to go high.
26.
The negative-going edge at IC1-6 clocks IC1b so that IC1-10 goes high for 2ms.
The trailing edge of the second pulse sets IC2-1 high again, but this time IC1b
resets after 2ms, clocking IC2-12 and resulting in IC2-3 going high. This ensures
that IC3-4 remains low during the speech mode.
27.
4.5ms after the commencement of the second pulse, IC1-7 resets high so that the
transmitter is now keyed in the speech mode.
28.
Timings of IC1a and IC1b, controlled by RV2 and RV3 respectively, are absolutely
crucial to the reliable switching of the circuit into speech and must be accurately
set.
Page 3 - 8
TM1184 Issue 1
RPT 633
Switching from Speech to Data
29.
The speech cancel signal consists of 1.25s of binary 1s. In the speech mode IC1-7
is high with the result that IC2-1 is low. The negative-going leading edge of the first
bit of data clocks IC1a so that IC1-7 goes low, switching PL1-3 to the low DATA
mode. The negative-going transition at IC1-5, IC1a times out with the result that:
a) IC1-7 goes high putting PL1-3 into the quiescent condition.
b) IC1-6 clocks IC1b for 2ms.
c) The combined lows at PL1-4 and IC1-6 result in IC2-4 going high.
30.
As IC1-10 goes low again, after 2ms, it clocks IC2 with the result that IC2-3 goes
low, IC3-4 goes high and PL1-2 returns to its quiescent high condition.
Figure 5: Switching Into Speech
TM1184 Issue 1
Page 3 - 9
RPT 633
Figure 6: Switching From Speech
Page 3 - 10
TM1184 Issue 1
RPT 633
SECTION 4
INSTALLATION AND COMMISSIONING
CONTENTS:
1.
INTRODUCTION
2.
3.
4.
5.
6.
8.
INSTALLATION
Positioning
Shelf Mounting
Wall Mounting
Antenna
Modulation Inputs
Power Supply
9.
COMMISSIONING
TABLES
Page
1.
2.
3.
4 - 4
4 - 4
4 - 5
Encoder Mounted in a Card Frame Assembly
Encoder Mounted in a Single Slot Housing
Operating Instructions
FIGURES
1.
2.
3.
Mounting Hole Diagram
Rear Panel Connections
Typical Access 340 System Configuration
4 - 2
4 - 3
4 - 3
_______________________
INTRODUCTION
1.
Section 4 of this manual details the Installation and Commissioning procedures to
be carried out on a new equipment.
TM1184 Issue 1
Page 4 - 1
RPT 633
INSTALLATION
Positioning
CAUTION
DO NOT MOUNT OVER A HEATER OR RADIATOR, OR IN DIRECT SUNLIGHT
AND ENSURE A DRY ENVIRONMENT.
2.
Carefully unpack the transmitter, power supply and antenna. Site the transmitter and
power supply in a convenient working position within reach of an AC power outlet
and within 1km of the encoder.
Shelf Mounting
3.
Lay the transmitter on a suitable horizontal shelf on its integral mounting feet
(sloping panel upwards). Connect the antenna as indicated in paragraphs 5 or 6
and the remainder of the electrical connections as paragraph 7.
Wall Mounting
4.
Mark and drill the wall as shown, suitable for No 8 plugs and round-head screws.
Insert screws into plugs with the top of the screw head a maximum of 10mm from
the wall and the bottom of the screw head a minimum of 5mm from the wall.
Remove the rubber pads from the bottom of the base tray and hook the transmitter
onto the screws. The transmitter can be mounted either antenna up or antenna
down.
155
105
Dimensions in mm
PSG/10290-
Figure 1: Mounting Hole Diagram
Page 4 - 2
TM1184 Issue 1
RPT 633
Antenna
5.
Two versions of the UHF antenna are available, a straight vertical whip for wall
mounted transmitters and a right angled whip for shelf mounted transmitters.
Figure 2: Rear Panel Connections
Modulation Inputs
6.
When connecting the transmitter to an RPE 340 series encoder, SK1 and SK2
should be connected as shown in Figure 3.
0301-0193
ENCODER
RPE 340/341
TELEPHONE
JUNCTION
BOX OR
SOCKET
OR
ANALOGUE
BLACK LEADS
ANALOGUE
TEL I/F
DTMF/
MODEM/
SPEECH
0360-9602
0360-8623
TRANSMITTER
TERMINAL
BLOCK
RPT 633
DATA/
DLC
POWER
SUPPLY
PSU
DIGITAL
RED & WHITE
LEADS
DIGITAL
POWER
SUPPLY
PSG/10287-1
Figure 3: Typical Access 340 System Configuration
TM1184 Issue 1
Page 4 - 3
RPT 633
7.
When connecting an RPT 633 transmitter to a Access 3000, it is first necessary to
use Engineering Mode Test 50 to configure the Encoder into the Non-DTMF mode.
The connections shown in Table 1 and 2, as applicable, should then be made
between the encoder and transmitter.
Table 1: Encoder Mounted in a Card Frame Assembly
SIGNAL
NAME
ENCODER
PIN No.
D TYPE
PIN No.
CABLE
TYPE
COLOUR
CODE
*TRANSMITTER
INPUT
Data
0V
29c
30a
23
} 0401-0009 {
Orange
White/Blue
} SKT2
{left
{right
Speech {
12a
12c
17
} 0401-0011 {
Violet
Yellow
} SKT1
{right
{left
* As seen from the rear of the transmitter.
Table 2: Encoder mounted in a Single Slot Housing
SIGNAL
NAME
ENCODER
PIN No.
MODULAR
JACK
PIN No.
CABLE
TYPE
COLOUR
CODE
Data
0V
29c
30a
} 0301-0092 {
Yellow
Blue
} SKT2
{left
{right
Speech {
12a
12c
} 0301-0091 {
Orange
Red
} SKT1
{right
{left
*TRANSMITTER
INPUT
* As seen from the rear of the transmitter.
8.
Power Supply
Ensure that the power supply is correctly rated for your application and has the
correct mains connector. Insert the power supply outlet plug into SK3 at the rear
of the unit and plug the supply into the mains socket.
Page 4 - 4
TM1184 Issue 1
RPT 633
COMMISSIONING
9.
Refer to Table 3 and carry out the operating procedures as detailed for the
RPT 633 transmitter.
Table 3: Operating Instructions
ENCODER
REFERENCE
Access 1000
Access 3000
} LCU Operator's Guide
} 9261-0382 or 9261-0682
RPE 340
RPE 341
} TM1158, Section 2, paragraphs 19-40
RPE 340A
TM1154, Section 4, paragraph 4.3
RPE 350
TM1164, Section 4, paragraph 11
TM1184 Issue 1
Page 4 - 5
RPT 633
INTENTIONALLY BLANK
Page 4 - 6
TM1184 Issue 1
RPT 633
SECTION 5
SERVICING
CONTENTS:
1.
INTRODUCTION
2.
REPAIR POLICY
3.
TEST EQUIPMENT
4.
5.
6.
7.
DISMANTLING AND RE-ASSEMBLY INSTRUCTIONS
Access to Circuit Boards
Removing the VOX Keying Module
Removing the Transmitter Board
Re-Assembly
8.
9.
10.
11.
12.
13.
TRANSMITTER BOARD ALIGNMENT PROCEDURE
Initial Settings
Initial Connections
Setting up Phase Lock Loop
Transmitter Alignment
Setting Data Deviation and Centre Frequency
Setting Analogue Modulation
14.
VOX KEYING MODULE ALIGNMENT PROCEDURE
15.
16.
ANTENNA CUTTING
Introduction
Cutting
17.
FAULT-FINDING
TABLES
1.
2.
3.
4.
Data Deviation
Analogue Deviation
Antenna Lengths
Test Points
TM1184 Issue 1
Page
5-7
5-8
5-9
5-10
Page 5 - 1
RPT 633
CONTENTS: (Continued)
FIGURES
1.
2.
Page
Transmitter Layout: Variables, Links and Test Points
Antenna Cutting
5-4
5-9
_______________________
INTRODUCTION
1.
Section 5 details the dismantling and reassembly instructions, alignment procedure
and the test equipment required to carry out the procedure. The transmitter contains
two printed circuit boards (PCB's). It is recommended that field service engineers
carry one complete VOX Keying Module for on-site replacement and subsequent
base repair of the faulty board.
REPAIR POLICY
2.
In Section 6 is a list of spare parts for servicing the transmitter board down to
component level. Passive chip components (capacitors and resistors) are unlikely
to contribute to failure of the equipment in the field. Chip transistors and diodes
should be ordered in strips of 10 or more. A replacement antenna will need to be
cut to length before fitting, according to the information given in paragraph 17.
TEST EQUIPMENT
3.
The following test equipment is required to carry out the repair procedure.
DC Power Supply 18V, 1A.
Absorption Wattmeter, 5W 420-470MHz,
or
Thruline RF Power Meter 5W, 420-470MHz with Power Attenuator 5W,
20-30dB.
Frequency Counter 500MHz, accuracy 1 part in 107 or better.
Audio Signal Generator.
Modulation Meter.
Oscilloscope.
Page 5 - 2
TM1184 Issue 1
RPT 633
DISMANTLING AND RE-ASSEMBLY INSTRUCTIONS
CAUTION
STATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT. CARE
MUST BE TAKEN TO ENSURE DAMAGE TO THESE DEVICES IS NOT
CAUSED BY HIGH LEVELS OF STATIC ELECTRICITY. SPARE BOARDS OR
COMPONENTS SHOULD BE STORED IN ANTI-STATIC PACKAGING WHEN NOT
INSTALLED IN THE EQUIPMENT.
Access To Circuit Boards
4.
Disconnect the antenna and connectors from the rear of the case. At the rear of the
unit unscrew and remove the two retaining screws. Lift the top cover at the rear and
invert it so that it slides under the base from the front, ensuring that the ribbon
cable and the two screened cables are not strained.
Removing the VOX Keying Module
5.
Disconnect the ribbon cable at the keying module. De-solder the two screened
cables at the transmitter board. Remove the four screws which secure the keying
module to the lid and remove the module.
Removing the Transmitter Board
6.
Disconnect the ribbon cable at the transmitter board. De-solder the two screened
cables at the transmitter board. Remove the four nuts which secure the board to the
base and remove the board.
Re-Assembly
7.
Re-assembly is the reverse of the procedure for dismantling.
TM1184 Issue 1
Page 5 - 3
RPT 633
Figure 1: Transmitter Layout: Variables, Links and Test Points
Page 5 - 4
TM1184 Issue 1
RPT 633
TRANSMITTER BOARD ALIGNMENT PROCEDURE
Initial Settings
8.
Set the variable components and links as follows:
VC1
VC2
VC3
VC4
VC5
Anywhere.
Half Meshed.
Fully Un-meshed.
Fully Un-meshed.
25% Meshed.
FL1 and FL2 - Adjusters standing proud by 2mm.
RV1
RV2
RV3
RV4
Fully Anti-clockwise.
Mid Position (15 turns from either end).
Anywhere
Mid Position
LK1 - Position 2-3 Normal Version.
Position 1-2 FTZ Version.
LK2 - Position 1-2 Output frequencies less than 447MHz.
Position 2-3 Output frequencies greater than or equal to 447MHz.
LK3 - Position 2-3 Normal Operation.
Position 1-2 Invert Data Sense.
Initial Connections
9.
Set up the test equipment as follows:
a) Connect the absorption wattmeter or power meter to the antenna socket using
a lead no longer than 300mm.
b) Connect the modulation meter and frequency counter to the attenuated output.
c) Connect the power supply to SK3.
d) Connect the audio signal generator via a 0.47µF capacitor to SK1.
TM1184 Issue 1
Page 5 - 5
RPT 633
Setting up Phase Lock Loop
10.
Set up the Phase Lock Loop as follows:
a) Switch on the power supply.
b) Connect the oscilloscope to TP3.
c) Adjust the slug of L1 to give 5V ±0.2V DC at TP3.
Transmitter Alignment
11.
To align the transmitter carry out the following procedure:
a) Connect the oscilloscope to TP7.
d) Adjust RV3 to give 0V ±50mV DC at TP7.
c) Key ON the transmitter by shorting TP2 to TP9.
d) On FL1 and FL2 turn the four adjusters ½ turn at a time until the power meter
indicates or the power supply current increases.
e) If no power appears slightly adjust VC2 or VC3 and repeat (d).
f)
Tune the four adjusters of FL1 and FL2 for maximum power.
g) Tune VC1, VC2 and VC3 for maximum power and then RV1 to give a power
meter reading of 2.5W.
h) Re-adjust VC1, VC2 and VC3 for maximum power then RV1 for 2.5W ±0.2W.
Setting Data Deviation and Centre Frequency
12.
To set the data deviation and centre frequency carry out the following procedure:
NOTE: The purpose of this adjustment is to set the deviation, i.e. for 25kHz
channel spacing, to ±4.5kHz (9kHz total) when the data polarity switch is
set from "1" to "0".
a) Set LK3 of the VOX keying module to AB to select the DATA mode.
b) Connect TP14 to TP15 (+5V) to select the binary 1 state.
Page 5 - 6
TM1184 Issue 1
RPT 633
c) Measure the output frequency to the nearest 10Hz; switch the data polarity to
the binary O state by connecting TP14 to TP9 and again measure the output
frequency. Adjust RV2 and repeat this process until the difference between the
two frequencies is as given in the TOTAL DEVIATION column in Table 1 for the
appropriate transmitter channel spacing, with a tolerance of ±100Hz.
d) Using a plastic trimming tool adjust VC5 until the mean of the two frequencies
measured at (c) is within 100Hz of the specified center frequency of the
transmitter.
e) Repeat sub-paragraphs (c) and (d) as necessary.
f)
Switch the mode switch to ANALOGUE by setting LK3 on the VOX keying
module to AC and adjust RV3 to give the specified centre frequency of the
transmitter to a tolerance of ±100Hz.
Table 1: Data Deviation
CHANNEL
SPACING
kHz
DEVIATION
kHz
TOTAL
DEVIATION
kHz
25
20
12.5
10
±4.5
±3.6
±2.25
±1.8
7.2
4.5
3.6
Setting Analogue Modulation
13.
To set the analogue modulation carry out the following procedure:
a) Set LK3 of the VOX keying module to AC to select the ANALOGUE mode.
d) Set the audio generator output to 1.25kHz at a level of approximately 11mV
peak-to-peak as measured on the oscilloscope. Monitor the deviation on the
modulation meter.
c) Refer to Table 2(a) and adjust the generator output level to give give a
deviation corresponding to the channel spacing.
d) Increase the signal generator output level by 20dB and adjust RV4 to give a
deviation coresponding to that given in Table 2(b). This should be the larger of
the Peak + or Peak - readings on the modulation meter.
e) Reduce the signal generator level by 20dB and re-adjust its level to give a
deviation corresponding to that given in Table 2(c).
TM1184 Issue 1
Page 5 - 7
RPT 633
f)
Increase the signal generator level by 20dB and re-adjust RV4 to give a
deviation corresponding to that given in Table 2(b).
g) Vary the signal generator frequency between 300Hz and 2.5kHz and check that
the deviation does not exceed that given in Table 2(d). If it does, tune to the
frequency that gives the maximum deviation and adjust RV4 to give a deviation
corresponding to that given in Table 2(e). This should also be the larger of the
Peak + or Peak - readings.
Table 2: Analogue Deviation
CHANNE
SPACING
kHz
DEVIATION
(a)
kHz
DEVIATION
(b)
kHz
DEVIATION
(c)
kHz
DEVIATION
(d)
kHz
DEVIATION
(e)
kHz
25
20
12.5
10
±3
±2.4
±1.5
±1.2
4.75
3.8
2.4
1.85
±3
±2.4
±1.5
±1.2
2.5
4.9
3.9
2.4
1.9
VOX KEYING MODULE ALIGNMENT PROCEDURE
14.
To set the timing circuits of the VOX Keying Module carry out the following
procedure:
a) With the RPE340 in the Engineering Mode, initiate Function 2, RPT calibration
signal. Alternatively use a P391 Test A7 to generate the same signal.
b) Monitor TP6 and adjust RV2 so that the mark/space ratio is 4.4/3.6ms.
c) Monitor TP3 and adjust RV3 so that the mark/space ratio is 2.6/5.4ms.
ANTENNA CUTTING
Introduction
15.
In the event of damage to the antenna, the replacement will require cutting to length
in accordance with the following instructions.
Cutting
16.
The antenna is a one piece UHF stub with internal connector. With reference to
Figure 1 after removal of the cap, the antenna should be cut to the length indicated
in Table 3, depending on frequency, and the cap replaced. The Part Numbers of
the uncut stubs are 5501-0001 (right angled) and 5501-0002 (straight).
Page 5 - 8
TM1184 Issue 1
RPT 633
Table 3: Antenna Lengths
CUT LENGTH
mm
FREQUENCY
MHz
156
154
152
150
149
147
145
143
142
140
139
420
425
430
435
440
445
450
455
460
465
470
Figure 2: Antenna Cutting
TM1184 Issue 1
Page 5 - 9
RPT 633
FAULT-FINDING
WARNING
GREAT CARE MUST BE TAKEN TO AVOID BREAKING OPEN THE
ENCAPSULATION OF TR10 ON THE TRANSMITTER BOARD WHEN REPAIR OR
COMPONENT REPLACEMENT IS BEING CARRIED OUT, AS THIS COMPONENT
CONTAINS TOXIC BERYLLIUM OXIDE.
17.
Table 4 shows the signals to be expected at the various test points as an aid to
fault-finding.
Table 4: Test Points
T.P.
Page 5 - 10
SIGNAL
Carrier Frequency
Tx Key (low-going)
PLL Control Voltage (nominally 5V)
VCO Frequency (div. by 256)
Crystal Frequency
In-Lock (high going)
Modulating Signal
-12V
0V
10
Audio Signal (limited)
11
Audio Signal (un-limited)
12
Over-rides Lock Fail when connected to TP13
13
+12V
14
Data
15
+5V
TM1184 Issue 1
RPT 633
SECTION 6
SPARE PARTS LIST
CONTENTS:
1.
GENERAL
2.
MODULES
3.
4.
5.
6.
7.
8.
9.
10.
11
12.
13.
14.
TRANSMITTER BOARD COMPONENTS
Capacitors
Connectors
Crystals
Diodes
Inductors
Integrated Circuits
Links
Resistors
Transducers
Transformer
Transistor
Antenna
15.
16.
BANDED COMPONENTS
Filters
Capacitors
17.
18.
19.
20.
21.
22.
VOX KEYING MODULE COMPONENTS
Capacitors
Connector
Diodes
Integrated Circuits
Resistors
Transistor
TM1184 Issue 1
Page 6 - 1
RPT 633
ITEM/CIRCUIT
REFERENCE
1.
2.
DESCRIPTION
PART NO.
GENERAL
INSERT MOULDING SCREENED
8-WAY INTER CONNECT FLEXFOIL
MOULDING COVER
CLAMPING PAD ADHESIVE
NUT M3
ESCUTCHEON
WASHER PLAIN M3
LABEL EQUIP.
RUBBER FEET 23MM
SCREW No. 6X16MM PAN HD POZI AB
0960-9887
4404-0001
0860-9846
1861-0225
1 9 6 6 3
2060-9878
20662
31600X7
33996
8204-0616
ASSY PCB VOX KEYING MODULE
PSU 240V UK PLUG
PSU 220V EURO PLUG
PSU 110V
0260-7083
0301-0605
0301-0606
0301-0607
MODULES
TRANSMITTER BOARD COMPONENTS
3.
Capacitors
C1,10,12,40,80
C2,47,72,74,111,117
C3,7,15,18,19,22,23,24,27,30
C4
C5,53,55
CAP
CAP
CAP
CAP
CAP
CHIP 220p 10% 50V
AL 10F 20% 16V
CHIP 1n 10% 50V
CHIP 1p 0.25p 50V
CHIP 3p9 0.25p 50V
3301-0150
3401-0089
3301-0100
3301-0001
3301-0008
C8,62,63,64,108,109
C9,90,91,92,93
C11
C13,35
C14,54
CAP
CAP
CAP
CAP
CAP
AL 4F7 20% 25V
AL 22F 20% 16V
CHIP 4p 0.25p 50V
CHIP 10p 0.25p 50V
CHIP 1p8 0.25p 50V
3401-0093
3401-0090
3301-0151
3301-0013
3301-0004
C16,17,36,67,68,75,79,85,87
C20,38,41,46,49,52,66,95
C21,26,32,34,43,48,61,78,88,94,
102
C25,60
C28,29
CAP CHIP 4n7 10% 50V
CAP CHIP 100n -20+80% 25V
3301-0108
3301-0149
CAP CHIP 220p 10% 50V
CAP CHIP 5p6 0.25p 50V
CAP CHIP 33p 5% 50V
3301-0081
3301-0010
3301-0025
C31,33,73,76,77
C39,118,129
C42
C44
C45,70,116
CAP
CAP
CAP
CAP
CAP
3301-0100
3301-0112
3301-0021
3301-0009
3306-0020
Page 6 - 2
CHIP
CHIP
CHIP
CHIP
CHIP
1n 10% 50V
10n 10% 50V
22p 5% 50V
4p7 0.25p 50V
1F 20% 16V
TM1184 Issue 1
RPT 633
ITEM/CIRCUIT
REFERENCE
3.
4.
C50,56,57
C51,89,113,132,133
C58
C59
C65
CAP
CAP
CAP
CAP
CAP
CHIP 3p3 0.25p 50V
CHIP 47p 5% 50V
CHIP 6p8 0.25p 50V
CHIP Op75 0.25P 50V
AL 1000F -10+50% 40V
3301-0007
3301-0029
3301-0011
3301-0251
3402-0001
C69
C71,100
C81
C82
C83,84
CAP
CAP
CAP
CAP
CAP
CHIP 2n2 10% 50V
POLYTR 330n 10% 63V
CER 180p N750 100V
CER 150p 2% 100V
CER 22p 2% 100V
3301-0104
3304-0010
3302-0231
3302-0151
3302-0141
C86
C96,101
C97,120,122
C98,104
C99,103
CAP
CAP
CAP
CAP
CAP
CHIP 8p2 0.25p 50V
PLYPRP 6n8 2.5% 63V
CHIP 180p 5% 50V
PLYPRP 10n 2.5% 63V
PLYPRP 4n7 2.5% 63V
3301-0012
3303-0003
3301-0043
3303-0004
3303-0002
C105,107,114,115,124,125,126
C106
C110,112,128,131
C119
C127,130
CAP
CAP
CAP
CAP
CAP
CHIP 220p 10% 50V
PLYPRP 2n2 2.5% 100V
CHIP 100n -20+80% 25V
AL 100F 20% 6.3V
CHIP 220p 10% 50V
3301-0081
3303-0009
3301-0149
3401-0084
3301-0081
VC1
VC2,3,4
VC5
CAP CHIP TRIM 10p
CAP VARIABLE 2-10p
CAP VARIABLE 4-40p
3506-0002
3501-0002
3501-0005
PLUG 2-WAY
SOCKET 2.1mm PCB MOUNT
SKT RF COAX PANEL
SOCKET 2-WAY
4501-0002
4431-0012
4414-0001
4501-0001
XTAL GENERIC SPEC
XTAL GENERIC SPEC (HIGH STABILITY)
CRYSTAL OVEN PLC1-27-12-75
3904
3905
6201-0001
DIODE
DIODE
DIODE
DIODE
3701-0027
3703-0017
3703-0004
3703-0001
Connectors
Crystals
XL1
XL1
OV1
6.
PART NO.
Capacitors (Continued)
SK1,2
SK3
SK4
5.
DESCRIPTION
Diodes
D1
D2
D3,4
D5
TM1184 Issue 1
VARICAP KV1310A-3 DUAL
ZENER CHIP BZX84C10
CHIP BAR 18
CHIP BAV99
Page 6 - 3
RPT 633
ITEM/CIRCUIT
REFERENCE
6.
8.
9.
PART NO.
Diodes (Continued)
D6,7
D8
D9,10,11
7.
DESCRIPTION
DIODE ZENER CHIP BZX84C5VI
DIODE MV2109
DIODE CHIP BAT54
3703-0010
3701-0001
3703-0044
L1
L2
L3,4
L5
L6
COIL MC111 SERIES
INDUCTOR 2F2H
INDUCTOR 470nH
INDUCTOR 10TURN
AIR COIL
4609-0001
4102-0009
4102-0005
4160-6235
4160-6236
L7
L8,9,11,12
L10,19,20,21
L13
L14,15,16
AIR COIL
INDUCTOR 220nH
INDUCTOR 22nH
INDUCTOR 100nH
ASSY COIL
4160-6237
4102-0003
4102-0050
4102-0001
605753
L17,18
L22
INDUCTOR 1mH
INDUCTOR 6F8
4102-0025
4107-0002
IC1
IC2
IC3,4
IC5
IC6
IC 560CDP
VOLT REG 78L82AWC
VOLT REG 7812C
VOLT REG 7805
IC 74HCTO5
3803-0003
95520
6001-0002
6001-0001
3819-0014
IC7
IC8
IC9
IC10,12
IC11
IC
IC
IC
IC
IC
14568BCP
HEF4069 SMD HEX INVERTER
SP4660DP
OP. AMP. LM348D
7661
3802-0001
3819-0007
3803-0001
3819-0003
3803-0025
IC13
IC14
IC OP AMP MC 1458ND
VOLTAGE REG ICL8069.REF:1.2V
3818-0001
6002-0026
2-WAY JUMPER LINK (GOLD PLATED)
4408-0001
Inductors
Integrated Circuits
Links
LK1,2,3
Page 6 - 4
TM1184 Issue 1
RPT 633
ITEM/CIRCUIT
REFERENCE
10.
DESCRIPTION
PART NO.
Resistors
R1
R2,12,17,63
R3,52,96
R4,6,9,14,24,47,61,62,80,87
R5,7,8,64,73
RES
RES
RES
RES
RES
CHIP
CHIP
CHIP
CHIP
CHIP
15k 5% 0.125W
2k2 5% 0.0625W
68R 5% 0.0625W
6k8 5% 0.0625W
33k 5% 0.0625W
3101-0174
3105-0179
3105-0143
3105-0191
3105-0207
R10,26,59,90
R11
R13
R15,45,86
R16,67,68,69,79,100
RES
RES
RES
RES
RES
CHIP
CHIP
CHIP
CHIP
CHIP
560R 5% 0.0625W
22R 5% 0.0625W
3k3 5% 0.125W
15k 5% 0.0625W
10k 5% 0.0625W
3105-0165
3105-0131
3101-0158
3105-0199
3105-0195
R18,19,37
R20
R21
R22
R23,25,29,74,109,115
RES
RES
RES
RES
RES
CHIP
CHIP
CHIP
CHIP
CHIP
220R 5% 0.0625W
3k9 5% 0.0625W
10R 5% 0.125W
100R 5% 0.125W
4k7 5% 0.0625W
3105-0155
3105-0185
3101-0098
3101-0122
3105-0187
R27,34
R28,39,40,99
R30,33,106
R31
R32,91
RES
RES
RES
RES
RES
CHIP
CHIP
CHIP
CHIP
CHIP
47R 5% 0.0625W
33R 5% 0.0625W
470R 5% 0.0625W
15R 5% 0.0625W
1k2 5% 0.0625W
3105-0139
3105-0135
3105-0163
3105-0127
3105-0173
R35,104
R36
R41,42
R43,53,58,117,119
R44,84,124
RES
RES
RES
RES
RES
CHIP 10R 5% 0.0625W
CHIP 18k 5% 0.0625W
MF 100R 1% 0.6W
CHIP 100R 5% 0.0625W
CHIP 22k 5% 0.0625W
3105-0123
3105-0201
3103-0188
3105-0147
3105-0203
R46,107,111,114,121,123
R48
R49
R50
R51,55,56,57,83
RES
RES
RES
RES
RES
CHIP
CHIP
CHIP
CHIP
CHIP
.0625W
0.0625W
0.0625W
0.0625W
.0625W
3105-0171
3105-0192
3105-0175
3105-0213
3105-0209
R54
R60
R66,75,77,97
R65,72,88
R76,89
RES
RES
RES
RES
RES
MF 4R7 1% 0.6W
CHIP 330R 5% .0625W
CHIP 47k 5% .0625W
CHIP 82k 5% .0625W
CHIP 68k 5% 0.0625W
3103-0156
3105-0159
3105-0211
3105-0217
3105-0215
R81,85
R82
R92,101
R93,94,98
R95
RES
RES
RES
RES
RES
CHIP
CHIP
CHIP
CHIP
CHIP
3105-0193
3105-0205
3105-0219
3105-0181
3105-0231
TM1184 Issue 1
1k0
7k5
1k5
56k
39k
5%
5%
5%
5%
5%
8k2 5% .0625W
27k 5% .0625W
100k 5% 0.0625W
2k7 5% 0.0625W
330k 5% 0.0625W
Page 6 - 5
RPT 633
ITEM/CIRCUIT
REFERENCE
10.
11.
R102
R103,110,113,122
R105
R108
RES
RES
RES
RES
820R 5% .0625W
10k 5% 0.0625W
1k8 5% 0.0625W
6k8 5% .0625W
3105-0169
3105-0195
3105-0177
3105-0191
R116
R118,120
TH1
RES CHIP 3k3 5% 0.0625W
RES CHIP 150R 5% .0625W
THERMISTOR 10k
3105-0183
3105-0151
3211-0002
RV1
RV2
RV3
RV4
POT
POT
POT
POT
3202-0001
3208-0010
3208-0009
3202-0005
14.
CHIP
CHIP
CHIP
CHIP
CERMET 100R
MULTITURN 10k
MULTITURN 5k
CERMET 2k2
Transducer
TRANSDUCER
5001-0001
ASSY TRANSFORMER
0460-6222
TR1,13,14
TR2
TR3,12
TR4,6
TR5
TRANS
TRANS
TRANS
TRANS
TRANS
3602-0018
3602-0008
3602-0010
3602-0001
3602-0011
TR7,8
TR9
TR10
TR11
TRANSISTOR
TRANSISTOR
TRANSISTOR
TRANSISTOR
Transformer
T1
13.
PART NO.
Resistors (Continued)
LS1
12.
DESCRIPTION
Transistors
BCW61C
MMBFU 310
BCW33
BFS 17
BCW31
BFR96-02
MRF559
MRF630
BFS19
3601-0001
3601-0003
3601-0012
3602-0003
Antenna
ANTENNA RPE303
FLEXIBLE STRAIGHT ANTENNA
Page 6 - 6
5501-0001
5501-0002
TM1184 Issue 1
RPT 633
ITEM/CIRCUIT
REFERENCE
DESCRIPTION
PART NO.
BANDED COMPONENTS
15.
Filters
FL1,2
FL1,2
FL1,2
16.
FILTER HELICAL 252-MX-1547A BAND 1
FILTER HELICAL 252-MX-1549A BAND 2
FILTER HELICAL 252-MX-1551A BAND 3
4605-0005
4605-0006
4605-0007
CAP CER 10p 0.25p 63V BAND 1
CAP CER 10p 0.25p 63V BAND 2
CAP CER 8p2 0.25p 63V BAND 3
3302-0099
3302-0099
3302-0098
Capacitors
C6
C6
C6
VOX KEYING MODULE COMPONENTS
17.
Capacitors
C1
C2,3,5,6,7
C4
C8
18.
3401-0008
3304-0002
3304-0009
3401-0100
8-WAY PLUG RT ANGLED
4303-0044
DIODE 1N4148
INDICATOR LED HLMP1700
17535
3704-0011
IC 4538
IC 74HC107
IC 74HCO2
3802-0043
3801-0049
95993
Diodes
D1,2
D3
20.
AL 22FF 20% 16V
POLYTR 100n 10% 63V
POLYTR 220n 10% 63V
AL 10F 20% 35V
Connector
PL1
19.
CAP
CAP
CAP
CAP
Integrated Circuits
IC1
IC2
IC3
TM1184 Issue 1
Page 6 - 7
RPT 633
ITEM/CIRCUIT
REFERENCE
21.
22.
DESCRIPTION
PART NO.
Resistors
R1
R2
R3
R4
R5
R6
RES
RES
RES
RES
RES
RES
MF
MF
MF
MF
MF
MF
39k 1% 0.6W
10k 1% 0.6W
680R 1% 0.6W
100k 1% 0.6W
1k5 1% 0.6W
47k 1% 0.6W
3103-0250
3103-0236
3103-0208
3103-0260
3103-0216
3103-0252
RV1
RV2,3
POT CERMET 2k2
POT CERMET 220k
3202-0005
3202-0011
TRANSISTOR BC183L
95785
Transistor
TR1
Page 6 - 8
TM1184 Issue 1
APPENDIX 1
UHF SERIAL ENCODER MODEL RPE 673
CONTENTS
1.
INTRODUCTION
2.
ROLE
3.
PHYSICAL CONSTRUCTION
4.
5.
SPECIFICATION
Encoder
Connectors
7.
OPERATING INSTRUCTIONS
8.
TECHNICAL DESCRIPTION
PRE-INSTALLATION CHECKS
13. Unpacking
14. Tools required
15. Test Equipment required
16.
17.
24.
26.
30.
31.
35.
INSTALLATION PROCEDURE
Wall Mounting
Software Configuration
Parameter Definitions
Connecting the External Device
Audio Connection
Direct Line Contacts (DLCs)
Antenna
TM 1184 Issue 1 AL1 (May 1997)
Page A1 - 1
RPE 673
CONTENTS (Continued)
37.
39.
44.
46.
47.
48.
49.
SERVICING
Repair Policy
Removal / Re-fitting of Circuit Boards
Transmitter Alignment - Initial settings
Setting up the Phase Lock Loop
Transmitter Alignment
Setting Data Deviation and Centre Frequency
Setting Analogue Deviation
50. FAULT FINDING
51. ANTENNA CUTTING
52. SPARE PARTS LIST
1.
2.
3.
4.
5.
6.
TABLES
Page
Encoder SK1/SK2 Pin Outs
P910 Connections
P911 Connections
DLC Connections
Data Deviation
Analogue Deviation
A1 - 12
A1 - 12
A1 - 13
A1 - 14
A1 - 21
A1 - 22
FIGURES
1.
2.
3.
4.
5.
6.
7.
8.
9.
Encoder Connections
Wall Mounting Template
Set-up Menu
P910/P911 Connector Pin Layout
External Connections
Serial Encoder - Service Layout
Transmitter PCB Layout
Test Menu Options
Serial Encoder Interconnection Diagram
Page A1 - 2
A1 - 5
A1 - 7
A1 - 8
A1 - 13
A1 - 15
A1 - 16
A1 - 18
A1 - 20
A1 - 24
TM 1184 Issue 1 AL1 (May 1997)
INTRODUCTION
1.
This Appendix outlines the installation and operation of the Radio Paging
Serial Encoder (Transmitter/Encoder) model RPE 673. The Serial Encoder utilises the
existing RPT 633 Transmitter PCB and, whenever necessary, reference is made
to the appropriate section in the main body of this manual.
ROLE
2.
The Multitone RPE 673 is a single channel radio paging Serial Encoder operating in the
UHF frequency band. The Serial Encoder provides paging facilities for Mk6 or Mk7 code
format alphanumeric and speech radio paging systems. The Serial Encoder can be used
to call up to 10,000 radio paging receivers.
PHYSICAL CONSTRUCTION
3.
The RPE 673 consists of an Encoder PCB combined with a 2.5W Transmitter
PCB (as used in RPT 633) together in one moulded plastic housing.
SPECIFICATION
NOTE:
For Transmitter characteristics and crystal frequency calculation refer to
Section 1.
Encoder
4.
The performance characteristics of the Encoder are as follows:
a) Protocol:
ESPA 4.4.4. or MEP (Determined by firmware)
b) Code Format:
Multitone Mk6 or Mk7 (Programmable)
c) Paging Addressees:
10,000
d) Beep Codes:
Eight
e) Message Transmission:
Up to 60 alphanumeric characters
f) Speech Transmission:
Duration is unlimited and under the control of the
External Device (speech is applicable only when
ESPA 4.4.4. protocol is used)
TM 1184 Issue 1 AL1 (May 1997)
Page A1 - 3
RPE 673
Connectors
5.
6.
The RPE 673 Serial Encoder is fitted with the following external connectors:
a)
SK1:
Audio Input
Two pin moulded socket (600 Ohm)
b)
SK2:
Not Used
c)
SK3:
Power Supply Unit
Four-way FCC68 socket
d)
SK4:
Antenna
TNC (50 Ohm)
In addition, the following internal connectors are fitted to the Encoder PCB:
a)
SK1:
Serial Data input
Eight-way FCC68 socket
b)
SK2:
Serial Data input
Four-way IDC
c)
SK3:
Remote DLCs 1-4
Four-way IDC
d)
SK5:
Remote DLCs 5-8
Four-way IDC
e)
SK4:
Ground for RS232 / DLCs
RS485 Data I/P (Not used)
Four-way IDC
NOTE:
Physical Characteristics, Operational Environment and Power Supply
Options are identical to the RPT 633.
OPERATING INSTRUCTIONS
7.
The Radio Paging Serial Encoder is fully automatic in use and operation is limited to
switching on the mains supply.
Page A1 - 4
TM 1184 Issue 1 AL1 (May 1997)
TECHNICAL DESCRIPTION
NOTE:
For a circuit description of the Transmitter, refer to Section 3.
8.
The RPE 673 Serial Encoder provides a communications link between any device with
a standard RS232 data output and up to 10,000 paging receivers. Valid data is
processed by a purpose built digital Encoder and fed to a 2.5W UHF Transmitter (based
upon the RPT 633) for onward transmission.
9.
The Encoder is driven by the serial RS232 data input (SK1 or SK2) and the eight DLC
inputs (SK3 and SK5) using ESPA 4.4.4 or MEP protocol (as determined by firmware).
Receipt of serial data or closure of any DLC causes the Encoder to enter the call
generation routine. A paging transmission is assembled in either Mk6 or Mk7 paging code
format. The format is selected during installation (refer to paragraph 24).
10. The eight DLC inputs may be used for remotely sited contacts which must close to initiate
paging calls. The DLC paging messages can be configured during installation (refer to
paragraph 24).
11. Figure 1 illustrates Encoder input / output connections. Power (+5V) is supplied to the
Encoder PCB from the Transmitter PCB on PL1-1 and ground is PL1-7.
12. The Encoder PCB also contains circuitry for the signal conditioning of the audio/speech
input to the Serial Encoder. PL2 on the Encoder PCB is for factory test purposes only.
RS232 DATA
(SK1 or SK2)
Tx
Rx
RTS
CTS
ENCODER
GND (SK4)
PL1
RV1 - AUDIO ADJUST
SK3
DLCs 1 - 8
SK5
P4
P5 P7
P6
TL2 TL1
POWER
TL9
Tx KEY
AUDIO (SK1)
TL8
TRANSMITTER
POWER (SK3)
PSU
MODE
DATA
BEEP
PL1
SK4
ANTENNA
TAG10817-
Figure 1:
TM 1184 Issue 1 AL1 (May 1997)
Encoder Connections
Page A1 - 5
RPE 673
PRE-INSTALLATION CHECKS
CAUTION
STATIC SENSITIVE DEVICES ARE USED
OBSERVE STATIC SAFETY PRECAUTIONS.
WITHIN
THIS
EQUIPMENT.
Unpacking
13. Unpack the container and examine the contents against the list given below:
a)
RPE 673 Serial Encoder Unit
Qty 1
b)
Power Supply Unit, 3-pin plug (UK) or 2-pin (Europe)
Qty 1
c)
Antenna Assembly *
Qty 1
d)
Socket, 2-way (4501-0001)
Qty 2
Supplied only when requested on Sales Specification Form
Tools Required
14. The following tools will be required:
a)
Screwdrivers - Flat and Cross-Point
b)
IDC Insertion Tool
Test Equipment Required
15. The following test equipment will be required:
a)
PC with RS232C serial port
b)
P910 Cable Assembly, 9-Way, D-Type or
P911 Cable Assembly, 25-Way, D-Type
c)
4404-0003 Interconnect Flexible
Page A1 - 6
TM 1184 Issue 1 AL1 (May 1997)
INSTALLATION PROCEDURE
Wall Mounting
CAUTION
ENSURE THE UNIT IS MOUNTED IN A DRY ENVIRONMENT. DO NOT MOUNT
THE UNIT OVER A HEAT SOURCE OR IN DIRECT SUNLIGHT.
16. The unit may be mounted on a suitable horizontal shelf or wall-mounted using the
following procedure:
a)
Referring to Figure 2 (or using the template supplied with the Serial Encoder), drill
holes to accept 8mm plugs and screws.
155 mm
TAG 10821-1
Figure 2: Wall Mounting Template
b)
Fit the plugs into the holes and insert the screws into the plugs leaving 5mm
clearance between the screw heads and the wall.
c)
Remove the four rubber feet from the base and slot the Serial Encoder onto the screw
heads.
NOTE:
It may not be possible to carry out the Software Configuration using a
PC whilst the External Device is connected. It is recommended that
the Software Configuration is carried out before connecting the External
Device.
TM 1184 Issue 1 AL1 (May 1997)
Page A1 - 7
RPE 673
Software Configuration
17. To gain access to Encoder socket SK1, remove the two cross-point screws from the
rear of the unit. Lift the cover slightly (it will only clear the base by 4 to 5 inches). Carefully
disconnect the 8-way flexi-cable from PL1 of both Transmitter and Encoder. Pivoting on
its front edge, invert the cover and slide it under the base. Fit test cable 4404-0003 to PL1
of Transmitter and Encoder.
18. Connect the serial port of your PC to SK1 (FCC 68) of the Encoder PCB using the
P910 or P911 cable. If using Windows 95, run Hyper-Terminal; if using Windows 3.1,
run Terminal.Exe. Configure your serial port as follows: 9600 Baud, 8 Data bits,
2 Stop bits, no Parity bit, Flow Control = Hardware.
19. Connect the external power supply to SK3 of the Serial Encoder. Power up the Serial
Encoder, wait 3 seconds and, within a further 10 seconds, press ; the
(S)et-up / Test Menu should appear on the VDU. Select (S)et-up; the Setup menu
should appear on the VDU (see Figure 3).
Setup
=====
FIRMWARE M670101
Serial Port: 1200 Baud, 7 Data Bits, 2 Stop, Even Parity
Serial Protocol = MEP Options: Timeout = 1
Code Format: Mk 7 System Address: 0 Time-of-Day: Off Time-of-Day User No: 1234
DLC
Rx No
BC
Message
1111
‘Message 1'
1230
‘Message 2'
333G
45GG
‘Message 3'
‘Message 4'
-------------------------------------------------------
8910
‘Message 8'
Choose:F
- Set Code (F)ormat
- Set (T)ime-of-Day Option
- Change Serial (P)ort Settings
1-8 - Edit DLC 1 - 8
- Set (S)ystem Address
- Set Time-of-Day (U)ser
- Change Serial Protocol (O)ptions
- (Q)uit
Figure 3: Set-up Menu
20. Having accessed the Set-up Menu the following parameters may be set:
1-8
Page A1 - 8
Code Format
Time-of-Day Option
Serial Port Settings
Edit DLCs
System Address
Time-of-Day User
Serial Protocol Options
Quit
TM 1184 Issue 1 AL1 (May 1997)
21. Definitions for each parameter are given in paragraph 24.
22. Once a setting has been selected, the following message will be displayed:
‘....Writing to Eeprom - please wait.....Done’
and the Set-up screen will again be displayed.
23. For Serial Port Settings however, parameters are not written to the Eeprom until
‘W’ (Write to Eeprom) is selected from the Serial Port Set-up Menu.
Parameter Definitions
24. The Parameter Definitions are as follows:
DLC
Configuration
Each DLC has a configurable Receiver Number (Rx No), Beep Code (BC) and
Message.
a)
Rx No
Four digit code in the range 0000 - 9999. The Rx No will be
automatically prefixed with the System Address to form the RIC.
Group calls may be initiated in order to call a group of paging
receivers within a specified range of addresses by inserting the
wildcard character ‘G’ into the Rx No.
If one wildcard character is included as the least significant digit
then a group of 10 receivers will be called, eg: ’333G will
call receivers ’3330 to ’3339 (where ’ = SystemAddress).
If two wildcard characters are included as the two least significant
digits then a group of 100 receivers will be called, eg: ’45GG
will call receivers ’4500 to ’4599 (where ’ = System Address).
b)
Beep
Code
Single digit in the range 1 - 8
c)
Message
Mk6: Maximum length of 10 characters in the range 0 - 9,
(hyphen) and .
Mk7: Maximum length of 60 characters in the standard ASCII
character set ie, (Hex 20) through to ‘~’ (Hex7E).
Serial Port
Settings
These parameters are for the V24/RS232 port and are set to match the
External Device to which the Serial Encoder is connected. The selections are self
explanatory however, once the settings have been made, they must be
written to the Eeprom by entering ‘W’ ([W]rite changes to Eeprom).
NOTE:
TM 1184 Issue 1 AL1 (May 1997)
During set-up and test, the Serial Encoder communicates using a fixed
set of parameters (9600 Baud, 8 Data Bits, 2 Stop Bits, No Parity Bit).
The above Serial Port Settings only take effect during normal operation.
Page A1 - 9
RPE 673
Serial Protocol
Options
a) MEP:
The only serial option for MEP protocol is the Timeout setting:
Setting
NOTE:
b) ESPA:
Timeout
100 ms
1 second
2 seconds
3 seconds
Setting
Timeout
4 seconds
5 seconds
6 seconds
7 seconds
The Timeout settings are designed to allow flexibility in
the response times from different external devices.
There are two options:  on the Terminal keyboard; the Set-up / Test Menu should
appear on the VDU (see Figure 8).
j)
Select (T)est Menu.
NOTE:
The Transmitter Tests are used to key the Transmitter during
alignment, Full Test is for factory use only.
Set-up / Test Menu
===============
T - (T)est Menu
S - (S)et-up Menu
Q - (Q)uit
T - (T)ransmitter Tests
F - (F)ull Test
Q - (Q)uit
Transmitter Test Menu
==================
M - Key up Transmitter - (M)arking
S - Key up Transmitter - (S)pacing
P - Key up Transmitter - (P)reamble
A - Key up Transmitter - (A)nalogue
Q - (Q)uit
TAG 10827-1
Figure 8: Test Menu Options
Setting up the Phase Lock Loop
46. Set up the Phase Lock Loop as follows:
a)
Connect the oscilloscope to TP3.
b)
Adjust the slug of L1 to give 5V ±0.2V DC at TP3.
Transmitter Alignment
47. To align the Transmitter carry out the following procedure:
a)
Connect the oscilloscope to TP7.
b)
Adjust RV3 to give 0V ±50mV DC at TP7.
c)
Key up the Transmitter by selecting (A)nalogue.
Page A1 - 20
TM 1184 Issue 1 AL1 (May 1997)
d)
On FL1 and FL2 turn the four adjusters ½ turn at a time until the power meter
indicates or the power supply current increases.
e)
If no power appears slightly adjust VC2 or VC3 and repeat (d).
f)
Tune the four adjusters of FL1 and FL2 for maximum power.
g)
Tune VC1, VC2 and VC3 for maximum power and then RV1 to give a power meter
reading of 2.5W.
h)
Re-adjust VC1, VC2 and VC3 for maximum power then RV1 for 2.5W ±0.2W.
Setting Data Deviation and Centre Frequency
48. To set the Data Deviation and Centre Frequency carry out the following procedure:
a)
Select (M)arking (continuous ‘1's) from the Transmitter Test Menu. Measure the
output frequency to the nearest 10Hz.
b)
Select (S)pacing (continuous ‘0's) from the Transmitter Test Menu and again
measure the output frequency to the nearest 10Hz.
c)
Adjust RV2 as necessary until the measurement at (b) differs from the
measurement at (a) by the amount given in the TOTAL DEVIATION column of
Table 5 (within the specified tolerance).
d)
Using a plastic trimming tool adjust VC5 until the mean of the two frequencies
measured at (a) and (b) is within 100Hz of the specified centre frequency of the
Transmitter.
Table 5: Data Deviation
CHANNEL
SPACING
kHz
DEVIATION
kHz
TOTAL
DEVIATION
kHz
TOLERANCE
25
20
12.5
10
± 4.5
± 3.6
± 2.25
± 1.8
7.2
4.5
3.6
± 200Hz
± 200Hz
± 100Hz
± 100Hz
e)
Repeat sub-paragraphs (a) to (d) as necessary.
f)
Select (A)nalogue from the Transmitter Test Menu. Adjust RV3 to give the specified
centre frequency of the Transmitter (to a tolerance of ±100Hz).
TM 1184 Issue 1 AL1 (May 1997)
Page A1 - 21
RPE 673
Setting Analogue Deviation
49. To set the Analogue Deviation carry out the following procedure:
a)
Select (A)nalogue from the Transmitter Test Menu.
b)
Set the audio generator output to 1.25kHz at a level of -13dBm (approximately
11.5mV peak-to-peak as measured on the oscilloscope). Monitor the deviation on
the modulation meter. Adjust RV1 on the Encoder PCB fully clockwise.
c)
Refer to Table 6(a) and adjust the generator output level to give a deviation
corresponding to the channel spacing.
d)
Increase the signal generator output level by 20dB and adjust RV4 to give a deviation
corresponding to that given in Table 6(b) (this should be the larger of the Peak ‘+’ or
Peak ‘-’ readings on the modulation meter).
Table 6: Analogue Deviation
CHANNEL
SPACING
kHz
DEVIATION
(a)
kHz
DEVIATION
(b)
kHz
DEVIATION
(c)
kHz
DEVIATION
(d)
kHz
25
20
12.5
10
±3
± 2.4
± 1.5
± 1.2
± 4.5
± 3.6
± 2.25
± 1.80
±5
±4
± 2.5
±2
± 4.9
± 3.9
± 2.4
± 1.9
e)
Reduce the signal generator level by 20dB and re-adjust its output level to give a
deviation corresponding to that given in Table 6(a).
f)
Increase the signal generator level by 20dB and re-adjust RV4 to give a deviation
corresponding to that given in Table 6(b).
g)
Vary the signal generator frequency between 300Hz and 2.5kHz and check that the
deviation does not exceed that given in Table 6(c). If it does, tune to the frequency
that gives the maximum deviation and adjust RV4 to give a deviation corresponding
to that given in Table 6(d) (this should be the larger of the Peak + or Peak - readings
on the modulation meter).
h)
Adjust RV1 on the Encoder PCB as necessary to compensate for the output level
provided by the external audio source at the customers premises.
j)
Remove the signal generator.
Page A1 - 22
TM 1184 Issue 1 AL1 (May 1997)
FAULT FINDING
50. Specific fault finding information is not provided. For Transmitter test points, together
with expected signals, refer to Section 5.
NOTE:
When the Serial Encoder is fitted with MEP firmware, it can be tested
using CITEST.EXE (supplied with the Developers Pack D3NA).
ANTENNA CUTTING
51. Refer to Section 5.
52. SPARE PARTS LIST
NOTE:
For General Spares and Transmitter PCB components, refer to
Section 6.
ITEM / CIRCUIT
REFERENCE
IC2
IC2
DESCRIPTION
PART No.
ENCODER PCB
FIRMWARE RPE 671 /673 + ESPA
FIRMWARE RPE 671 /673 + MEP
0201-0654
0501-0175
0501-0179
TM 1184 Issue 1 AL1 (May 1997)
Page A1 - 23
RPE 673
Figure 9: Serial Encoder Interconnection Diagram
Page A1 - 24
TM 1184 Issue 1 AL1 (May 1997)

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