NHRC NHRC-4/M2 Instructions de montage
NHRC-4/M2
Installation
and
Setup Guide
Hardware Version: Rev. B.
Guide Version: 2005-Aug-31
Copyright Notice
Copyright 2000, 2001, 2005, by NHRC LLC
This document contains proprietary information, which is the confidential property of
NHRC LLC.
No part of this document may be used or reproduced, by any means, or for any purpose,
without the expressed written consent of NHRC LLC.
No part of this document should be considered to be specifications for the proper or
correct operation of the NHRC-4/M2 Repeater Controller. In no way will NHRC LLC be
liable for direct or indirect damages to the controller or attached equipment.
Printed in the U.S.A.
Thank You!
Thank you for purchasing the NHRC-4/M2 Repeater Controller. This controller has been
designed using the very latest state-of-the-art technology. Please review this manual
carefully before putting your controller into operation.
This manual represents a very large documentation effort. Your comments are
important to us. If you find an error or find any passages that are not clearly
understandable we would like to hear about it. Please send your comments to
Support for the controller is available by email or telephone. Please direct software-
promptly.
Questions of a more urgent nature can be answered by telephone support. Telephone
support is available Monday through Friday, from 6 PM until 10 PM, Eastern Time.
Table Of Contents
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page i
1. INTRODUCTION................................................................................................................................2
2. INSTALLATION..................................................................................................................................2
2.1 PRIMARY RADIO PORT CONNECTIONS ............................................................................................2
2.1.1 Option 1: Use an interface cable...............................................................................................2
2.1.2 Option 2: Modify the MASTR II System Board. ........................................................................3
2.2 SECONDARY RADIO PORT WIRING..................................................................................................4
2.3 TS-32/TS-64 HOOKUP ....................................................................................................................5
2.3.1 TS-64 Notes ...............................................................................................................................5
2.3.2 TS-32 Notes ...............................................................................................................................6
3. INSTALLING THE NHRC-4/M2 INTO THE MASTR II...............................................................7
3.1 THE LED STATUS INDICATORS.......................................................................................................7
3.2 INSTALLING THE NHRC-DAD WITH THE NHRC-4/M2..................................................................7
3.3 USING THE DIGITAL OUTPUT ..........................................................................................................8
3.4 ADJUSTING THE AUDIO LEVELS......................................................................................................8
4. APPENDICES.....................................................................................................................................10
4.1 TERMINOLOGY AND ABBREVIATIONS ...........................................................................................10
5. CIRCUIT BOARD .............................................................................................................................11
5.1 INTERCONNECTIONS .....................................................................................................................11
6. SCHEMATICS ...................................................................................................................................12
7. PARTS LIST.......................................................................................................................................15
NHRC LLC LIMITED WARRANTY ......................................................................................................17
NHRC-4/M2 User Guide
Page 2 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
1. Introduction
This manual describes how to install and set up the NHRC-4/M2 repeater controller. This manual
should be used in conjunction with the NHRC-4 Operating Manual, which describes the
programming and operation of the controller.
2. Installation
This section of the User Guide describes the electrical interfaces used to connect the
controller to:
• Power and primary repeater (the GE MASTR II),
• Link/Remote Base radio
• Communications Specialists TS-64 CTCSS Encoder/Decoder
• Optional NHRC-DAD digital audio delay board(s).
It is intended for the repeater operator to use in the planning and installation of the NHRC-
4/M2 Repeater Controller into a repeater system.
The controller is designed to be installed inside of a GE MASTR II mobile or station. The
controller is installed onto the connectors that GE intended for the “channel guard” board.
CTCSS is supported with an optional CommSpec TS-64. All of the controller’s signals, for
the primary and secondary radios, as well as the digital output are presented at either J908 or
J909.
2.1 Primary Radio Port Connections
The NHRC-4/M2 operates using the MASTR II as the "primary" radio. The primary radio
must operate in full-duplex mode. If your MASTR II is not already converted for full-duplex
operation, consult the NHRC WWW MASTR II Info-site Full Duplex Conversion for
duplexing information.
There are two options for interfacing the CAS and TX audio to the controller. These signals
do not normally appear on the P908 plug on the system board of the MASTR II. You can
either use an interface cable, or you can modify the
2.1.1 Option 1: Use an interface cable
Transmit audio and CAS appear on the controller at J1, a 3-pin header. Wire an interface
cable as shown in the table below:
J1 Connections
J1
Pin # MASTR II
Signal
1 MIC HI
J902 #6
2 CAS
J904 #9
3 MIC LO
J902 #5
NHRC-4/M2 User Guide
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page 3
2.1.2 Option 2: Modify the MASTR II System Board.
By cutting one trace and adding two wires to the MASTR II system board, the jumper
described in option 1, above, can be avoided.
Add a wire that connects P908 pin 2 to J902 pin 6 (the exciter's MIC HI input). Cut the trace
that leads to P908 pin 3 on the system board, and add a wire that connects P908 pin 3 to
J904 pin 9 (the CAS signal from the IFAS board). Install 0 ohm resistors (jumpers) R22 and
R38 on the NHRC-4/M2 board, enabling the TX audio and CAS signals on the J908
connector. Note that these jumpers may already be populated on your board. If you plan on
using the local microphone on the MASTR II's control head, install a 1.5K resistor in
location R38.
P908 Primary Radio Port Connections
P908
Pin # NHRC-4/M2 Use System Board Modification
1 Discriminator Audio
2 Transmit Audio Add Wire to MIC HI On Exciter (J902-6)
3 CAS Cut existing trace to P908-3.
Add Wire to CAS on IFAS (J904-9)
4 10V Regulated
5 no connection
6 PTT
7 CG Encode
Delayed PTT
9 Ground
NHRC-4/M2 User Guide
Page 4 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
2.2 Secondary Radio Port Wiring
The controller provides the secondary radio port on the F3 through F8 frequency select
leads, using the P909 connector. These leads are routed to the front panel control cable
connector on the systems board. In mobile MASTR II radios, these control lines are
sometimes subject to the installation of diodes and jumpers and cutting of traces to share
channel elements across more than one channel selection. These diodes and jumpers must be
removed, and the cut traces must be jumpered to for proper operation of the controller.
Consult the MASTR II service manual for information on these jumpers.
Dissecting an old control cable makes an easy job of attaching your secondary radio to the
MASTR II. In an E-chassis MASTR II, a bit of clever wiring in the systems board can allow
a repeater on the "top deck" and the secondary, remote-base radio on the "bottom deck".
In base stations and repeaters, the P909 connector is unused. Individual wires must be
attached to P909 to break out the secondary radio port.
P909 Secondary Radio Port Connections
P909
Pin # NHRC-4/M2 Use Frequency
Select
J901
(control cable)
Pin #
1 Secondary port CAS F8 15
2 Secondary port PTT F7 14
3 Secondary port CTCSS detect F6 13
4 Secondary port receiver audio F5 12
5 Secondary port transmitter audio F4 11
6 Digital output F3 10
7 no connection F2 9
8 Unused, ground to select F1 F1 8
It is extremely important that the radio attached to the secondary radio port be provided with
a common ground from the MASTR II. The "A-" lead (J901 pin 30) is a good spot. If this
common ground is not provided, erratic operation or distorted audio on the secondary radio
will result. Also note that the Secondary port CAS requires an active high signal. Consult the
NHRC-4/M2 Remote Base Breakout Application note for instructions on converting CAS
from active low if an active high signal cannot be supplied.
NHRC-4/M2 User Guide
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page 5
2.3 TS-32/TS-64 hookup
Connector JTS32 is a 7-pin header that allows the easy installation of an optional
Communications Specialists TS-32 or TS-64 for CTCSS decode, encode, CTCSS audio
filtering, and reverse-burst. (Reverse burst is only available with the TS-64.) Wire JTS32 to
the TS-32/TS-64 as follows:
JTS32 Connections
JTS32
Pin # TS-32
Signal Description
1 +V POWER +10 volts to CTCSS board
2 CTCSS DECODER INPUT receiver audio to CTCSS decoder
3 TO AUDIO FILTER INPUT receiver audio to audio filter input
(separate lead for TS-64)
4 FROM AUDIO FILTER OUTPUT filtered audio to controller
5 CTCSS DETECT decode signal from CTCSS decoder
See important warning below!
6 CTCSS ENCODER OUTPUT CTCSS tone to transmitter
7 - GROUND & HANG-UP Ground
WARNING:
DO NOT APPLY VOLTAGE TO THE CTCSS DETECT INPUT!
This input is pulled low by the CTCSS decoder when CTCSS is NOT PRESENT. It will float high
when CTCSS is detected. Application of voltage to this input will destroy Q4 and render the
controller inoperative. Damage of this nature is not covered by the NHRC Limited Warranty.
The TS-32 and the TS-64 both have a high-pass filter to remove the CTCSS tone from the
repeated audio. By removing jumper JP3, the controller's audio can be passed through the
audio filter on the TS-32/TS-64.
Note: If the audio filter is not used, then jumper JP3 must be installed in order for audio to
be passed through the controller.
The Communications Specialists CTCSS boards are not supplied by NHRC. Contact
Communications Specialists at 800-854-0547 directly to order these boards.
2.3.1 TS-64 Notes
Consult the NHRC-4/M2 TS-64 Application note for detailed connection instructions.
The TS-64 has a reverse-burst/PTT delay feature that can be used with the NHRC-4/M2.
This feature is useful to eliminate the squelch crash received by the user's radio when the
repeater transmitter drops. Note that the user's radios must have CTCSS decoding enabled
for this to work. The NHRC-4/M2 provides support for the PTT delay through jumper JP4.
JP4 pin 1 is the controller's PTT signal, and JP4 pin 2 is PTT to the MASTR II. If the
reverse-burst/PTT delay feature is not used, then a jumper must be installed on JP4 so the
controller can key the MASTR II.
NHRC-4/M2 User Guide
Page 6 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
Adjust the CTCSS deviation with R20 on the TS-64 board, with the "CG LEVEL" pot on
the MASTR II exciter set to midrange. The ideal deviation for the CTCSS tone is 750 Hz.
Consult the TS-64 INSTRUCTION SHEET for details on setting the CTCSS frequency and
the reverse burst.
2.3.2 TS-32 Notes
The TS-32 must have the JU-2 jumper cut. Use the OUT-2 signal from the TS-32 into the
CTCSS detect of the NHRC-4/M2. If you want to be able to disable the CTCSS
requirement, install a switch on the HANGUP lead. The TS-32 will supply CTCSS encode
tone to the exciter through the NHRC-4/M2.
Adjust the CTCSS deviation with the R29 on the TS-32 board, with the "CG LEVEL" pot
on the MASTR II exciter set to midrange. The ideal deviation for the CTCSS tone is 750 Hz.
Consult the TS-32 INSTRUCTION SHEET for details on setting the CTCSS frequency.
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