NHRC NHRC-4/M2 Assembly instructions

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
[email protected].
Support for the controller is available by email or telephone. Please direct software-
related questions via email to [email protected]. Please direct hardware-related
questions via email to [email protected] . Your question(s) will be answered
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.

NHRC-4/M2 User Guide
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page 7
3. Installing the NHRC-4/M2 into the MASTR II
The controller installs in the MASTR II where the MASTR II "Channel Guard" board
normally belongs, plugged into the top of the systems board in the front of the radio. If you
have not already removed the Channel Guard board, do so now by pulling it straight up and
out of the radio. The NHRC-4/M2 installs with the component side of the board facing the
control head cable connector. Carefully line up the P908 (left side) and P909 (right side)
connectors with the pins on the system board. Push the board down firmly until the
connectors are right against the system board. The controller is now installed.
3.1 The LED Status Indicators
The NHRC-4 repeater controller is equipped with five status LEDS that aid in setup and
troubleshooting. There are green LEDs for each radio port that indicate that the controller
has getting a valid CAS (carrier operated switch) and, if a CTCSS decoder is connected, a a
valid CTCSS decode signal. The appropriate green LED should light when its receiver is
active, and, if a CTCSS decoder is present, the correct CTCSS tone is present. The yellow
LED indicates that a DTMF signal is being decoded on the primary receiver. This LED
should light for the entire duration that the DTMF signal is present on the primary receiver.
The red LED's indicates transmit. These LED will light when its respective transmitter is
transmitting.
The LEDS can be disabled to reduce the power consumption of the controller. Remove
jumper JP2 to disable the LEDS.
3.2 Installing the NHRC-DAD with the NHRC-4/M2
J2 Primary Radio DAD
J3 Secondary Radio DAD
Pin Use
1 +13.8 Volts to delay board
2 Audio to delay board
3 Audio from delay board
4 Ground/Audio Return
The audio delay for the primary radio simply plugs in to J2. The audio delay for the
secondary radio plugs in to J3. If the audio delay is not installed, a jumper between pins 2
and 3 of the port's delay connector must be installed, or the controller will not pass audio.
It is strongly recommended that the CTCSS filter be used, as described above, if both
CTCSS encode/decode and the audio delay are used.
See the Operation Instructions section on programming the flag bits to tell the controller the
delay is present.

NHRC-4/M2 User Guide
Page 8 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
3.3 Using the Digital Output
The NHRC-4 Repeater Controller has a digital output that can be used for various remote
control applications or to control a fan on the repeater's transmitter. The digital output is an
open-drain into a power MOSFET, which is capable of sinking quite a bit of current, but we
recommend a maximum load of about 500 mA. Use a relay to drive larger loads. The open-
drain output can be used to gate the HOOKSWITCH signal to a TS-32 or other CTCSS
decoder, to enable or disable CTCSS. Software allows the output to be enabled, disabled, or
pulsed. In fan control mode, this output will be turned on when the transmitter is turned on,
and turned off a programmable amount of time after the transmitter is turned off.
3.4 Adjusting the Audio Levels
Audio Level Adjustments
Potentiometer Use
VR1 Primary Receiver Level
VR2 Secondary Receiver Mix Level
VR3 Primary Receiver Mix Level
VR4 Beep Tone Mix Level
VR5 Primary Transmitter Master Level
VR6 Secondary Transmitter Master Level
Preset all potentiometers to midrange. Key a radio on the primary input frequency, send
some touch-tones, and adjust VR1 (the primary receiver level) until DTMF decoding is
reliably indicated by yellow LED D5.
Note: If VR1 is set too high, a crackling noise may be heard in the transmitted audio during
the hang time. Reduce the level set by VR1 until this noise goes away. Any repeated audio
level reduction caused by adjusting VR1 can be compensated for by adjusting VR3 (primary
receiver level) or VR5 (primary transmitter output level.)
The primary radio's transmit deviation is set with VR5 (the primary transmitter master level)
on the controller board and the transmitter's deviation/modulation control. The key to
properly adjusting these controls is to remember that the limiter in the transmitter is after
VR5 but probably before the transmitter's deviation/modulation control. The transmitter's
deviation/modulation control will set the actual peak deviation, and VR5 will set the level
into the transmitter. You do not want excessive limiting on normal speech going through the
repeater; it sounds bad and tends to "pump-up" background noise. On the other hand, some
limiting is desirable. An oscilloscope connected to the audio output of a receiver tuned to the
transmitter's frequency will show limiting as the audio gets "flat-topped" or clipped by the
limiter. Ideally, a 4.5KHz deviation signal input to the repeater should result in a 4.5 KHz
deviation output, and 5.5 KHz of input deviation should result in just under 5.0 KHz of
deviation out of the repeater. A service monitor (or two), deviation meter, and/or a signal
generator are necessary to do this job right.
The secondary radio's transmit deviation is set with VR2 (the secondary transmitter master
level). Enable the secondary transmitter, and adjust VR2 for proper transmit deviation,
similarly to VR5.

NHRC-4/M2 User Guide
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page 9
Enable the secondary receiver, and adjust VR6 for reasonable deviation on the enabled
transmitters when a signal is received on the secondary receiver.
Adjust VR4 (the beep level) to set the courtesy tone and CW tone level.
VR3 is used to set the primary receiver's audio mix level, and may not need to be adjusted
from midpoint.

NHRC-4/M2 User Guide
Page 10 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
4. Appendices
4.1 Terminology and Abbreviations
Term Description
CAS Carrier Activated Squelch, where receipt of a signal,
with or without CTCSS tones will activate the
controller.
CW Continuous Wave signals, commonly using “Morse
Code.” The term “CW” refers to the radio emission
type, while “Morse Code” refers to the signaling type
used. Typically, they are incorrectly used
interchangeably.
Digital Audio Delay (DAD) Digital Audio Delay (DAD) removes squelch crashes
and allows DTMF tones to be fully muted.
DTMF Also known as “Touch Tone” codes.
ID Identification
PTT Push-to-Talk

NHRC-4/M2 User Guide
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page 11
5. Circuit Board
5.1 Interconnections
Connector Name Purpose
P908 “REPEATER” Connects the primary repeater transmit and
receive audio, PTT, CAS, fan control, and
power signals to the controller.
P909 “REMOTE BASE” Connects the secondary repeater transmit and
receive audio, PTT, and CAS signals for the
radio to the controller.
J1 “AUX” Supplies MIC HI and CAS signals for
unmodified MASTR Iis (with no system board
modifications for the NHRC-4/M2)
J2 “DELAY” Connects power and audio signals for operation
of the Digital Audio Delay (NHRC-DAD) board
for the primary radio port.
J3 “RB DELAY” Connects power and audio signals for operation
of the Digital Audio Delay (NHRC-DAD) board
for the secondary radio port.
JTS64 “JTS64” Interfaces a Communications Specialists TS-64
to the controller for CTCSS detection.
This is a detailed top view of the Revision “B” printed wiring board for the NHRC-4/M2
Repeater Controller.

NHRC-4/M2 User Guide
Page 12 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
6. Schematics
The following two pages the schematic diagram for the Revision “B” Version of the NHRC-4/M2
Repeater Controller.

A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
DRAWN BY: N1LTL
FOR FLAT AUDIO
RESPONSE:
FC=1/6.28R*C
R=510K
RX AUDIO
AUDIO MUTE
VREF GENERATION
BUFFER
MAIN
LEVEL
INIT
C=0.0068uF
NOTE:
REMOVE C8,
NOTICE
MASTER LEVEL
REMOTE BASE
RX AUDIO
BUFFER
REMOTE BASE
LEVEL
REMOTE BASE
MAIN
MAIN RX
AUDIO MUTE
REMOTE BASERX
REMOTE BASE TX AUDIO
FOR FLAT AUDIO
RESPONSE:
FC=1/6.28R*C
R=510K
C=0.0068uF
NOTE:
MAIN RX AUDIO
DELAY CONNECTOR
MAIN RX
AUDIO LEVEL
AUDIO LEVEL
COURTESY TONE
MAIN
MASTER LEVEL
MAIN TX AUDIO
CONNECTOR
RX AUDIO DELAY
REMOTE BASE
TX AUDIO AMP
TX AUDIO AMP
NOTES:
2.) VCC = +5VDC
1.) VDD = +12VDC
CHANGE R21
AND R22 TO 100K
REMOVE C15
CHANGE R30
AND R32 TO 100K
RX AUDIO
RX AUDIO
3.) VREF = +6VDC (or 1/2 VDD)
THIS DRAWING CONTAINS
PROPRIETARY INFORMATION WHICH
IS THE CONFIDENTIAL PROPERTY
COPIED, REPRODUCED, DISCLOSED,
PUBLISHED OR USED IN PART OR
WHOLE WITHOUT THE EXPRESSED
OF NHRC LLC. IT SHALL NOT BE
WRITTEN PERMISSION OF NHRC LLC.
4.) ALL RESISTORS ARE 1/4W
5% TOL. UNLESS OTHERWISE
STATED.
5.) ALL CAPACITORS ARE 16V
ELECTROLYTIC / 50V CERAMIC
UNLESS OTHERWISE STATED.
SPECIFICATIONS SUBJECT TO CHANGE
WITHOUT NOTICE OR OBLIGATION.
PCB REV B
NHRC-4/M2 (Audio) B
NHRC-4/M2 Repeater Controller (Audio)
NHRC Repeater Controllers
444 Micol Road
Pembroke, NH 03275
603-485-2248
B
2 2Friday, November 06, 1998
http://www.nhrc.net
Title
SizeDocument Number Rev
Date: Sheet of
VCC
VDD
VREF
VDD
VREF
VREF
VCC
VDD
VREF
VREF
VREF
VDD
VREF
VDD
VDD
R31
100K
1 2
R27
100K
12
R15
10K
12
R16
100K
1 2
R8
22K
1 2
R18
100K
1 2
C18
0.1uF
1 2
C9
0.1uF
12
Q7
MPF102
3
1 2
R43
10K
12
R42
10K
12
+
C5
1uF
1 2
VR4
10K
POT
13
2
VR1
10K
POT
13
2
+
C1
1uF
12 C21
0.1uF
1 2
JP1
JUMPER
12
C22
0.0068uF
1 2
R35
510K
1 2
R36
51K
1 2
+C23
1uF
12
Q2
2N7000
2
31
-
+U4A
TL064
2
31
411
-
+U4C
TL064
9
10 8
R10
33K
1 2
R12
10K
12
+
C7
1uF
1 2
VR6
500K
POT
1 3
2
+
C12
1uF
12
R26
100K
12
R34
100K
1 2
Q6
MPF102
3
1 2
+
C4
1uF
1 2
VR2
10K
POT
13
2
+
C3
1uF
12
C10
0.0068uF
1 2
R19
510K
1 2
R20
51K
1 2
Q11
2N7000
2
31
-
+U4D
TL064
13
12 14
J2
HEADER 4
1
2
3
4
R7
22K
1 2
VR3
10K
POT
13
2
+
C6
1uF
1 2
+
C11
1uF
12
R11
10K
12
-
+U4B
TL064
6
57
R9
33K
1 2
VR5
500K
POT
1 3
2
R6
22K
1 2
J3
HEADER 4
1
2
3
4
+C17
22uF
25V
12
BEEP
DISC_AUDIO
DECODE_AUDIO
MUTE
VDD
GND
VCC
RB_TX_AUDIO
RB_DISC_AUDIO
RB_MUTE
TX_AUDIO

A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
uP RESET
DTMF DECODER
DRAWN BY: N1LTL
STD LED
NOTICE
BYPASS CAPS
COR LED
CAS/COR ISOLATION
REMOTE BASE
COR LED
CAS/COR ISOLATION
MAIN
PTT LED
PTT DRIVER
REMOTE BASE REMOTE BASE
MAIN
REMOTE BASE
REPEATER
CONNECTOR PTT LED
PTT DRIVER
MAIN
MAIN
3.) VLED = +5VDC for LED power
PIC uP
THIS DRAWING CONTAINS
PROPRIETARY INFORMATION WHICH
IS THE CONFIDENTIAL PROPERTY
COPIED, REPRODUCED, DISCLOSED,
PUBLISHED OR USED IN PART OR
WHOLE WITHOUT THE EXPRESSED
OF NHRC LLC. IT SHALL NOT BE
WRITTEN PERMISSION OF NHRC LLC.
NOTES:
2.) VCC = +5VDC
1.) VDD = +12VDC
4.) ALL RESISTORS ARE 1/4W
5% TOL. UNLESS OTHERWISE
STATED.
5.) ALL CAPACITORS ARE 16V
ELECTROLYTIC / 50V CERAMIC
UNLESS OTHERWISE STATED.
SPECIFICATIONS SUBJECT TO CHANGE
WITHOUT NOTICE OR OBLIGATION.
CONNECTOR
REMOTE BASE
DIGITAL OUTPUT DRIVER
TS32/64
CONNECTOR
LED ENABLE JUMPER
TS32/64
BYPASS
JUMPER
AUX MASTR II
INTERFACE
PCB REV B
NHRC-4/M2 (Digital) B
NHRC-4/M2 Repeater Controller (Digital)
NHRC Repeater Controllers
444 Micol Road
Pembroke, NH 03275
603-485-2248
B
1 2Monday, January 18, 1999
http://www.nhrc.net
Title
SizeDocument Number Rev
Date: Sheet of
Q1
Q2
Q3
Q4
MUTE
STD
PTT_EN
RB_COR
RB_MUTE
RB_PTT_EN
DOUT_EN
BEEP
COR
PICCLK
Q1
Q2
Q3
Q4
PICCLK
STD
RB_CAS
RB_COR
CAS
COR
PL_DEC
RB_PTT_ENPTT_EN
CAS
PL_ENC
PL_DEC
PL_ENC
DELAYED_PTT
PTTRB_PTT
RB_PL_DECCAS
DOUT_EN
DOUT
RX_AUDIO
RX_AUDIO
RX_AUDIO
FILT_RX_AUDIO
PTT
RB_PL_DEC
DOUT
RB_CAS
RB_PTT
VDD VCC
VDD
VCC
VLED
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VLED
VDD
VCC
VLED
VDD
VCC
VLEDVLED
VDD
VLEDVCC
VDD
R30
39K
12
R13
300K
12
R32
100K
1 2
C20
33pF
1 2
C15
0.1uF
12
C16
0.1uF
12
Q10
2N3906
3
2
1
R40
10K
1 2
+C14
220uF
25V
12
Y1
3.579MHz
1 2
D6
1N5226B
3.3V
1 2
+C19
1uF
12
+C13
1uF
12
U3
PIC16F84-04/P
RA0 17
RA1 18
RA2 1
RA3 2
INT/RB0 6
RB1 7
RB2 8
RB3 9
RB4 10
RB5 11
RB6 12
RB7 13
VDD 14
VSS 5
TOCKI/RA4 3
OSC2/CLKO
15 OSC1/CLKI
16
MCLR/VPP
4
R14
10K
1 2 Q1
2N7000
2
31
D5
LED
YEL
12
R5
470
12
R39
33K
12
U2
M-8870-01
VDD 18
VSS 9 OSC2
8OSC1
7
IN+
1IN-
2VREF
4
GS
3Q1 11
Q2 12
Q3 13
Q4 14
EST 16
STD 15
ST/GT 17 OE
10
IC 5
IC 6C8
0.1uF
12
D4
LED
GRN
12
R33
10K
12
R41
10K
1 2
R4
470
12
Q12
2N3904
1
2
3
Q13
2N3904
1
2
3
R37
10K
12
D2
LED
GRN
12
R17
10K
12
R21
10K
1 2
R2
470
12
Q3
2N3904
1
2
3
Q4
2N3904
1
2
3
R23
10K
12
R3
470
12
Q8
IRF510
1
23
R29
100
1 2
D3
LED
RED
12
R25
100
1 2
D1
LED
RED
12
Q5
IRF510
1
23
R1
470
12
R22
0
1 2
JP2
JUMPER
1 2
P908
HEADER 9
1
2
3
4
5
6
7
8
9R24
0
1 2
R38
0
1 2
J1
HEADER 3
1
2
3
U1
LM7805CT
IN
1OUT 3
GND
2
P909
HEADER 8
1
2
3
4
5
6
7
8
R28
100
1 2 Q9
IRF510
1
23
+
C2
1uF
1 2
JTS32
HEADER 7
1
2
3
4
5
6
7
JP3
JUMPER
1 2
JP4
JUMPER
12
BEEP
MUTE
DECODE_AUDIO
VDD
VCC
GND
RB_MUTE
TX_AUDIO
TX_AUDIO
DISC_AUDIO
RB_DISC_AUDIO
RB_TX_AUDIO

NHRC-4/M2 User Guide
Copyright 2001, 2005, NHRC LLC. All Rights Reserved. Page 15
7. Parts List
The following is the bill of materials for revision “B” of the NHRC-4/M2 Repeater Controller.
Item Qty. Ref. Schematic Value Description Mfg. Mfg. P/N Notes
1 11 C1 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C2 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C3 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C4 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C6 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C7 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C8 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C9 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C11 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C16 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
C19 1uF 1uF 16V Tantalum Cap Panasonic ECS-F1CE105K or equivalent
2 6 C5 0.1uF 0.1uF 50V Z5U Ceramic Radial Cap Panasonic ECU-S1H104MEA or equivalent
C13 0.1uF 0.1uF 50V Z5U Ceramic Radial Cap Panasonic ECU-S1H104MEA or equivalent
C15 0.1uF 0.1uF 50V Z5U Ceramic Radial Cap Panasonic ECU-S1H104MEA or equivalent
C17 0.1uF 0.1uF 50V Z5U Ceramic Radial Cap Panasonic ECU-S1H104MEA or equivalent
C18 0.1uF 0.1uF 50V Z5U Ceramic Radial Cap Panasonic ECU-S1H104MEA or equivalent
C20 0.1uF 0.1uF 50V Z5U Ceramic Radial Cap Panasonic ECU-S1H104MEA or equivalent
3 2 C14 0.0068uF 0.0068uF 50V X7R Ceramic Radial Cap Panasonic ECU-S1H682KBA or equivalent
C10 0.0068uF 0.0068uF 50V X7R Ceramic Radial Cap Panasonic ECU-S1H682KBA Do Not Populate
4 1 C12 22uF 25V 22uF 25V Aluminum Radial Electrolytic Cap Panasonic ECA-1EM220 or equivalent
5 1 C21 33pF 33pF 100V C0G Ceramic Radial Cap Panasonic ECU-S2A330JCA or equivalent
6 1 C22 220uF 25V 220uF 25V Aluminum Radial Electrolytic Cap Panasonic ECA-1EM221 or equivalent
7 1 D1 LED YEL Yellow T1¾ LED Lite-On LTL-4253 or equivalent
8 2 D2 LED GRN Green T1¾ LED Lite-On LTL-4233 or equivalent
D4 LED GRN Green T1¾ LED Lite-On LTL-4233 or equivalent
9 2 D5 LED RED Red T1¾ LED Lite-On LTL-4203 or equivalent
D3 LED RED Red T1¾ LED Lite-On LTL-4203 or equivalent
10 1 D6 1N5226B 3.3V 3.3V 5% 500mW Zener Diode Diodes Inc. 1N5226B or equivalent
11 3 JP1 JUMPER 2 Circuit Header, .100" Straight Molex 22-03-2021 or equivalent
JP2 JUMPER 2 Circuit Header, .100" Straight Molex 22-03-2021 or equivalent
JP3 JUMPER 2 Circuit Header, .100" Straight Molex 22-03-2021 or equivalent
12 2 JTS64 HEADER 6 6 Circuit Header, .100" Straight w/ lock Molex 22-23-2061 or equivalent
J3 HEADER 6 6 Circuit Header, .100" Straight w/ lock Molex 22-23-2061 or equivalent
13 2 J1 HEADER 4 4 Circuit Header, .100" Straight w/ lock Molex 22-23-2041 or equivalent
J2 HEADER 4 4 Circuit Header, .100" Straight w/ lock Molex 22-23-2041 or equivalent
14 1 J4 HEADER 8 8 Circuit Header, .100" Straight w/ lock Molex 22-23-2081 or equivalent
15 3 Q1 IRFI510G N Channel HEXFET IRF IRFI510G or equivalent
Q6 IRFI510G N Channel HEXFET IRF IRFI510G or equivalent
Q9 IRFI510G N Channel HEXFET IRF IRFI510G or equivalent
16 3 Q2 2N7000 N Channel MOSFET Fairchild 2N7000 or equivalent
Q5 2N7000 N Channel MOSFET Fairchild 2N7000 or equivalent
Q7 2N7000 N Channel MOSFET Fairchild 2N7000 or equivalent
17 2 Q4 MPF102 N Channel JFET Fairchild MPF102 or equivalent
Q3 MPF102 N Channel JFET Fairchild MPF102 or equivalent
18 4 Q8 2N3904 NPN Transistor Fairchild 2N3904 or equivalent
Q10 2N3904 NPN Transistor Fairchild 2N3904 or equivalent
Q11 2N3904 NPN Transistor Fairchild 2N3904 or equivalent
Q12 2N3904 NPN Transistor Fairchild 2N3904 or equivalent
19 1 Q13 2N3906 PNP Transistor Fairchild 2N3906 or equivalent
20 3 R1 22K 22K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-22K or equivalent
R2 22K 22K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-22K or equivalent
R4 22K 22K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-22K or equivalent
21 3 R3 33K 33K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-33K or equivalent
R7 33K 33K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-33K or equivalent
R38 33K 33K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-33K or equivalent

NHRC-4/M2 User Guide
Page 16 Copyright 2001, 2005, NHRC LLC. All Rights Reserved.
22 9 R5 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R10 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R11 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R12 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R13 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R14 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R15 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R35 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
R36 100K 100K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100K or equivalent
23 14 R6 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R8 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R16 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R19 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R20 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R21 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R24 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R25 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R29 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R30 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R31 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R33 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R37 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
R40 10K 10K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-10K or equivalent
24 3 R9 100 100 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100R or equivalent
R18 100 100 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100R or equivalent
R26 100 100 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-100R or equivalent
25 1 R23 93.1K 93.1K ¼W 5% Metal Film Resistor Yaego MFR-25FBF-93K1 or equivalent
26 5 R17 470 470 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-470R or equivalent
R22 470 470 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-470R or equivalent
R27 470 470 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-470R or equivalent
R32 470 470 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-470R or equivalent
R34 470 470 ¼W 5% Carbon Film Resistor Yaego CFR-25JB-470R or equivalent
27 1 R28 470K 470K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-470K or equivalent
28 1 R39 39K 39K ¼W 5% Carbon Film Resistor Yaego CFR-25JB-39K or equivalent
29 1 U1 TL064 Quad Op-Amp TI TL064CN see note 1
30 1 U2 LM7805CT 5V 1.0A Voltage Regulator Nat'l Semi LM340T-5.0 or equivalent
31 1 U3 M-8870-01 DTMF Decoder Teltone M-8870-01 see note 1
32 1 U4 PIC16C84-04/P PIC Microcontroller (Blank) Microchip PIC16F84-04I/P see note 1
33 4 VR1 10K POT 10K 6mm Carbon Trimpot Panasonic EVN-D2AA03B14 or equivalent
VR2 10K POT 10K 6mm Carbon Trimpot Panasonic EVN-D2AA03B14 or equivalent
VR3 10K POT 10K 6mm Carbon Trimpot Panasonic EVN-D2AA03B14 or equivalent
VR4 10K POT 10K 6mm Carbon Trimpot Panasonic EVN-D2AA03B14 or equivalent
34 2 VR5 200K POT 200K 6mm Carbon Trimpot Panasonic EVN-D2AA03B25 or equivalent
VR6 200K POT 200K 6mm Carbon Trimpot Panasonic EVN-D2AA03B25 or equivalent
35 1 Y1 3.579MHz 3.579545MHz Crystal ECS ECS-35-17-4 or equivalent
Additional Items
36 1 NHRC-4/M2 PCB REV B NHRC NHRC-4/M2 PCB REV B
37 2 18 Pin DIP Socket Mill-Max 110-99-318-41-001 use at U3/U4
38 1 14 Pin DIP Socket Mill-Max 110-99-314-41-001 use at U1
Notes:
1. Use sockets for U1, U3 and U4.