Park Air Electronics T6R Manual

ISSUE 1-2A
Maintenance Handbook
T6R VHF Receivers
ãPark Air Electronics 1999
Park Air Electronics
Northfields
Market Deeping
Peterborough
PE6 8UE
England
Telephone: [phone]
Fax: [phone] PAE Part Number: 31-160000RX
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CONTENTS
Preliminary Pages
Title page
Contents (this list)
Warnings page
Amendment record
Modification record
List of abbreviations used in this handbook
Section 1 - GENERAL INFORMATION
Section 2 - TECHNICAL DESCRIPTION
Section 3 - MAINTENANCE
Section 4 - VIRTUAL FRONT PANEL (VFP)
Section 5 - PARTS LIST
Section 6 - FIGURES
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WARNINGS
LETHAL VOLTAGES
Equipments in operational use contain lethal voltages and operations involving the removal of covers or
panels should only be undertaken by skilled personnel who are aware of the hazards involved.
CAUTION
ESDs
The equipment covered by this handbook contains electrostatic sensitive devices (ESDs). Observe
handling precautions to avoid static charges that may damage these devices.
UNAUTHORIZED MODIFICATIONS
Changes or modifications made to this equipment, not expressly approved by Park Air Electronics or
parties authorized by Park Air Electronics could void the user’s authority to operate the equipment.
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AMENDMENT RECORD
Amdt. Incorporated
By
Date Brief Details ECN
1 Park Air Sep 03 Section 6, List of Figures, Fig 10 title amended. -
2A Park Air Nov 03 Section 6, List of Figures, drawing numbers added. -
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MODIFICATION RECORD
MOD No. Details Date
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LIST OF ABBREVIATIONS USED IN THIS HANDBOOK
ac alternating current
A/D analogue to digital
AGC audio gain control
AM amplitude modulation
BIT built-in test
D/A digital to analogue
dc direct current
dB decibel
dBm decibels relative to 1 mW
DSP digital signal processing
ETI elapsed time indicator
ESD electrostatic sensitive device
Hz hertz
I/O input/output
kHz kilohertz
LCD liquid crystal display
LED light emitting diode
MARC multi-access remote control system
MHz megahertz
mm millimetre
MSK minimum shift keying
PC personal computer
PCB printed circuit board
RF radio frequency
RSE remote site equipment
RSSI receiver signal strength indicator
VCO voltage controlled oscillator
VFP virtual front panel
VHF very high frequency
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Section 1 General Information
Paragraph
1 Introduction
5 Model part number
6 Operating frequency
7 Input supplies
8 Built-in test (BIT) indications
11 Configurations
INTRODUCTION
1 This handbook provides the maintenance personnel with sufficient information to maintain and
repair the T6R receiver to module level. It provides an overview of the internal architecture of the receiver
and describes the various replaceable modules, their function, part number and how to obtain
replacements. In particular it enables the user to:
oConduct scheduled maintenance tasks including checking/setting the reference frequency
oscillator to compensate for long term ageing effects
oIdentify any tools or test equipment required to maintain the receiver
oUse the Built-in test facilities to check receiver functionality and identify fault conditions to a
particular module
oRemove a receiver from service to dismantle and replace a faulty module
oInstall the Virtual Front Panel (VFP) software into a PC
oUse the VFP to:
download all radio settings to a file that can be stored/printed for reference
change radio settings
copy settings from one radio to another
install new radio software
oCheck a radio after repair and return it to service.
2 A user guide (PAE part number 31-360000RX) is also available. The user guide describes the T6R
receiver and gives complete installation and setting up procedures.
3 Included with the maintenance handbook is a CD-ROM, containing the VFP software and the latest
operating and fill software, and a lead for connecting the radio to a Personal Computer (PC). The radio
software enables the original software to be re-loaded if the receiver's Digital Signal Processing (DSP)
module is ever replaced.
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4 The maintenance handbook, lead and software is sold as a T6R maintenance kit part number
70-6100MKIT.
Note ...
Both the maintenance handbook and user guide are available on CD-ROM. Contact PAE for
details.
MODEL PART NUMBER
5 The part number for the T6R receiver is: B6100
OPERATING FREQUENCY
6 The receiver’s operating frequency is determined by the synthesiser circuit in the Rx RF module and
can be changed by the user through the front panel, through the VFP or through an associated MARC
system (or compatible control and data system). Details of how to change the operating frequency are
contained in the T6R Receiver User Guide, Section 4 of this handbook (VFP) and the MARC User Guide
(MARC).
INPUT SUPPLIES
7 The receiver can be operated from standard ac input supplies, or from a low voltage dc supply (refer
to the User Guide for specification). Both ac and dc input supplies can be connected to the equipment.
When both ac and dc supplies are connected, operation from the ac supply takes priority; automatic
change-over to the dc supply will occur if the ac supply fails. On restoration of the ac supply, the
equipment reverts to ac operation.
BUILT-IN TEST (BIT) INDICATIONS
8 The receiver continuously self monitors key internal parameters without affecting normal operation.
If a BIT fault is detected, the front panel Alarm indicator lights, the Ready indicator becomes unlit, and the
receiver becomes inoperable.
9 Apart from continuous monitoring, an interruptive BIT test can be initiated locally at the front panel,
or remotely. Certain parameters are monitored when a noise signal is injected into the receiver's
circuitry.
10 The results of continuous monitoring, and of interruptive testing, are available at the front panel LCD
and, if connected, the VFP. When the receiver is used with a MARC system (or other compatible data
and control system) the results are also sent, in the form of a data message, to the monitoring facility.
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CONFIGURATIONS
11 The connectors used to configure the receiver depend on the required operating mode. The
purpose of each connector is described in the following text:
Antenna Connector Used in all operating modes to connect the 50 ohm antenna feeder
cable.
Headset/Diagnostics
Connector
This is a dual purpose connector. A headset can be connected to enable
local AM-voice operation.
Alternatively, a PC can be connected to allow use of the VFP, to set the
receiver's operational settings, or to download new software.
Reference Connector Used in all operating modes to check and reset the receiver's reference
frequency.
Facilities Connector Used primarily to connect remote signals when using AM-voice mode
and the receiver does not form part of a MARC system.
Some auxiliary signals available at this connector, for example the
24 volt (nominal) unregulated output supply, can be utilized irrespective
of the operating mode.
MARC Port The MARC port is used to connect remote signals when the receiver
forms part of a MARC system, or other compatible control and data
system.
Computer Port The computer port is used in digital communication modes to connect
the receiver to a control computer.
12 See Section 2 for external connector details.
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T6R Receiver Configuration
T6R Receiver
Antenna
Connector
Facilities
Connector
Computer
Port
MARC
Port
Headset/Diagnostics
Connector
Reference
Connector

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Section 2 Technical Description
Paragraph
1 INTRODUCTION
4 MODULES AND ASSEMBLIES
7 DSP module
8 Central processor
9 Digital signal processing
10 Programmable gate array
11 Speech coding/decoding
12 Computer interface
13 Serial remote control/data port
14 Facilities port
15 Front panel interface
16 Analogue control interfaces
18 Digital control interfaces
19 Rx RF module
20 RF converter
22 IF filter/converter
25 Synthesiser
28 BIT
29 Front panel module
30 LCD module
31 Rotary encoded switch
32 Indicators
33 Loudspeaker amplifier
34 Front panel connections
35 Receiver power supply modules
EXTERNAL CONNECTORS AND FUSES
39 External connectors
40 Reference connector
41 Headset/diagnostics connector
43 Facilities connector CN5
45 MARC port CN6
46 Computer port CN7
47 AC input connector
48 DC input connector
49 External Fuses
Table Page
1 Facilities port connections 4
2 Digital I/O signals 5
3 Microphone/headset connections 9
4 Diagnostic PC connections 9
5 Facilities connector CN5 pin-out 10
6 MARC connector CN6 pin-out 11
7 Computer port CN7 pin-out 12
8 Input ac fuse rating 13
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INTRODUCTION
1 This section describes the modules and assemblies that comprise the T6R receiver and details the
equipment’s connectors. Designed for rack mounting in a standard 19 inch rack the unit operates from
standard 120/240 V ac supplies with automatic changeover to 28 V dc in the event of mains failure. The
majority of user connections are made through rear mounted connectors.
2 A front panel connector is used for the connection of a headset for local operation or for the
connection of a PC for Virtual Front Panel (VFP) control. Operational settings are configured at the front
panel, through the VFP, or through an associated MARC system (or compatible control and data
system). At the receiver, operational settings are selected and displayed using the front panel
Scroll/Select switch and the LCD.
3 The receiver is housed in a sheet metal chassis with top and bottom lids. Two compartments (top
and bottom) contain most modules and assemblies with front and rear panels straddling the
compartments.
MODULES AND ASSEMBLIES
4 The receiver comprises the following replaceable modules and assemblies:
oDSP module
oRx RF module
oFront panel module
oPSU module
oPower supply regulator module.
5 The interconnection of the modules and assemblies is shown in Fig. 3.
6 A brief functional description for each module and assembly is given in the following paragraphs.
Reference should be made to Fig. 2 when reading these descriptions.
DSP MODULE
7 The DSP module provides the receiver user interfaces and performs message formatting,
demodulation and control functions for the receiver. Mounted on the module are the 'rear panel' Facilities
connector CN5, MARC connector CN6 and Computer port CN7 (see Fig. 3 for pin-out detail). The
module comprises the following functional entities:
Central Processor
8 Core control of the equipment is provided by a Hitachi Super H 16-bit RISC processor with both
internal and external ROM and RAM. The internal ROM is factory programmed with a basic ‘boot loader’
application; the main application code is held in external FLASH EPROM. This arrangement allows new
application software to be downloaded via a serial port. Configuration and calibration data is held in
external serial EEPROM. A supply voltage supervisor provides a reliable power up/power down reset
signal.
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Digital Signal Processing
9 The Super H processor is supported by two Analogue Devices 2171 DSP microprocessors
providing the computational power required to implement the demodulation algorithms.
Programmable Gate Array
10 Circuit functions are register mapped into the Super H address space using a Xilinx FPGA. This
allows the hardware configuration to be altered or upgraded by downloading new firmware.
Speech Coding/Decoding
11 The A/D and D/A functions required to interface the digital processing to the analogue lines are
provided by an A Law speech CODEC. Audio output is used to drive a front panel connected headset or
loudspeaker. Audio is also routed out via the Facilities port.
Computer Interface
12 Two RS422 full duplex synchronous serial ports, using HDLC protocol, provide the interface to an
external computer for use in digital modulation modes. A set of four input lines and four output lines,
operating at RS232 voltage levels, are also provided to allow a receiver to be linked to a transmitter to
form a base station.
Serial Remote Control/Data Port
13 An RS422 asynchronous serial port provides a link into a MARC system. The line connections on
the Facilities port are duplicated here for ease of connection to a Remote Site Equipment (RSE 2), part of
a MARC system.
Facilities Port
14 A number of inputs and outputs are provided via the Facilities port. These include the balanced
audio, tape output, unregulated supply and 0 V connections. The inputs and outputs are shown in
Table 1 (see also Table 5 on Page 10 for full pin-out of Facilities connector CN5).
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Table 1 Facilities Port Connections
Inputs: Outputs:
Squelch Defeat
Rx Disable
Bit Interruptive Test
Line out (+)
Line out (-)
Squelch Common
Squelch
RSSI
Ready
Tape Output
Unregulated Supply
Squelch output
Front Panel Interface
15 An 8-bit data bus and associated control signals are provided to drive the Front Panel LCD module
with separate lines also provided to drive the LEDs and to read the rotary encoder. An RS232
asynchronous serial port provides the diagnostics link.
Analogue Control Interfaces
16 To interface to the Rx RF module and Facilities port, D/A and A/D converters are employed. D/A
outputs from the DSP module are as follows:
oIF AGC (Rx RF module)
oRF AGC (Rx RF module)
oFrequency trim (Rx RF module)
oRSSI (Facilities port)
17 The A/D input to the DSP module is from the Rx RF module and is as follows:
oIF
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