GE 12R II Series User manual

COE Communications Engineering Document
Author: Keith Gilbertson Rev: A
Date: 3/08/02 Pag
e: 1 of 33
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GLOBAL SIGNALING DIVISION Title: 12RII FCC TECHNICAL MANUAL

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TABLE OF CONTENTS
1. Scope.....................................................................................................................................................................................3
2. Revision History...................................................................................................................................................................3
3. Reference Documents............................................................................................................................................................3
4. Abbreviations and Acronyms................................................................................................................................................3
5. 12RII Radio Systems.............................................................................................................................................................4
5.1. AAR Remote Radio System..........................................................................................................................................4
5.2. Clean Cab Radio systems..............................................................................................................................................6
5.3. Serial Remote Radio Systems (Future Option)..............................................................................................................8
5.4. Radio Final Assembly Parts List...................................................................................................................................8
5.5. Radio Front Assembly Parts List (LC version Only).....................................................................................................9
6. Radio Architecture..............................................................................................................................................................11
6.1. RC Radio Block Diagram............................................................................................................................................12
6.2. LC Radio Block Diagram............................................................................................................................................13
6.3. SR Radio Block Diagram............................................................................................................................................14
6.4. Radio Interfaces Signals..............................................................................................................................................15
7. Kenwood RFPA & TXRX Modules....................................................................................................................................20
8. POWER SUPPLY BOARD.................................................................................................................................................20
8.1. General Description....................................................................................................................................................20
8.2. Block Diagram............................................................................................................................................................20
8.3. Board Interface Signals...............................................................................................................................................21
8.4. External Interface Voltages..........................................................................................................................................21
8.5. RFPA Interface Voltages.............................................................................................................................................21
8.6. RCB Interface Voltages...............................................................................................................................................21
8.7. Power Supply Board Parts List...................................................................................................................................22
8.8. Power Supply Board Schematic..................................................................................................................................23
9. RADIO CONTROL BOARD ..............................................................................................................................................23
10. General Description........................................................................................................................................................23
10.1. Microprocessor & Digital Interface........................................................................................................................23
10.2. Audio Circuits.........................................................................................................................................................24
10.3. Audio Drivers .........................................................................................................................................................26
10.4. External I/O Interfaces.............................................................................................................................................27
11. Block Diagram................................................................................................................................................................28
12. FRONT PANEL..............................................................................................................................................................29
Standard 12RII Front Panel Controls.......................................................................................................................................29
Block Diagram........................................................................................................................................................................30
12.1. Front Panel Parts List..............................................................................................................................................31
12.2. Front Panel Board Parts List...................................................................................................................................32
12.3. Front Panel Schematic.............................................................................................................................................33

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1. Scope
This document provides the necessary technical information to comply with the requirements for FCC certification. This
document will be superseded by the 12RII Service Manual whenissued.
2. Revision History
REV DATE BY COMMENTS
A 3/8/02 KLG Initial Release FCC distributiononly.
3/19/02 JCK Added FCC Information to the User
3. Reference Documents
AAR Communication Manual – Section 12
12RII Part Number Assignment Document
TK-790/(B) Service Manual
4. Abbreviations and Acronyms
12RII-LC 12RII Local Control Radio (Control Panel Installed)
12RII-RC 12RII Remote Control Radio (Interface to Standard AAR Control Head)
12RII-SR 12RII Serial Remote Control Radio (Interface to Serial Remote Control Head)
AAR Association of American Railroads
DTMF Dual Tone Multi-Frequency (standard telephone tones).
FCC Federal Communication Commission
FM Frequency Modulation
FP Front Panel Assembly
FPB Front Panel Board
GETS General Electric Transportation Systems
GS Global Signaling
GSPN Global Signal Part Number
PC Personal Computer
PSB Power Supply Board
PTT Push – To - Talk
RCB Radio Control Board
RPM Radio Processor Module

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5. 12RII Radio Systems
The 12RII radio supports 3 major types of FM voice radio systems or applications. AAR Remote Control (RC), Locomotive
Clean Cab (LC) and Serial Remote (SR). All have similarities in basic radio operation. The major difference between the RC
and LC applications is the type of user interface. The RC uses the AAR standard interface for remote control radios. This
interface is defined in section12-10 of the AAR C&S Manual. The LC radio has a built in control panel on the front of the
radio. Interfaces to the LC radio are defined in section 12-2 of the AAR C&S Manual. The SR radio systemis identical to the
standard LC radio except that the front panel is installed in a remote mounted control head.
Note 1: This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not
cause harmful interference.
Note 2: Changes or modifications to this device not expressly authorized by the manufacture could void the user’s authority to
operate the equipment.
Note 3: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of
the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance withthe instructions, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and the receiver.
-Connect the equipment into an outlet on a circuit different fromthat to which the receiver is connected.
-Consult the dealer or an experienced radio/TVtechnician for help.
Note 4: FCC RF Radiation Exposure Statement
This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This equipment
should be installed and operated with a minimumdistance of 20cmbetween the radiator and your body.
Note 5: Professional installation of radio and antenna system is required to ensure proper operation and installation of this
equipment. To conform to FCC RF Radiation Exposure limits the installer must remain at least three meters away fromthe
transmitting antenna when the unit is transmitting. The antenna must be mounted on the top of the train engine as directed in the
installation guide.
5.1. AAR Remote Radio System
5.1.1. General Description
The 12RII-RC radio is compatible with the current 12R-RC radio in all its existing AAR Remote Applications. Refer to the
block diagramin the following section. In the AAR Remote application the primary interface for controls and audio signals is
with an external AAR compatible Control Head or Control Panel. Optionally an AAR handset can be connected to the rear of
the radio at J2. Antenna connection is provided through J1.
The 12RII-RC radio will mount onto the standard 12MT-1 AAR mounting adaptor. The radio will get locked into the 12MT-1
adaptor tray and they are installed as a unit onto a standard AAR Mounting Base such as the 1MB-1. The Mounting base
provides terminal blocks that allow the train wiring from the control panel and battery to be interfaced into a standard cable
supplied with the 1MB-1. This cable mates to J5 on the 12RII radio and provides power and control interface.

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5.1.2. AAR Remote Radio System Block Diagram
5.1.3. Basic Operation
The AAR Remote Radio is capable of performing all standard radio functions associated with transmitting and receiving radio
signals. The operator selects channels 1-12 froma channel selector. The channel selector drives 5 parallel channel lines to the
appropriate logic levels to cause the radio to go to the desired channel. A PTT (Push-To-Talk) signal line provides radio TX
control request fromthe operator. Other input control lines that may be applicable and associated with handset cradle or hang-
up functions are Mute, Quiet Line Disable, and Channel Revert. Additionally, certain customer applications require outputs that
provide indications of radio status such as Standby, Busy or TX.
The audio interfaces available at the J5 connector are microphone transmit audio, 10 watts speaker audio and a low level
receive audio signal. All audio levels are fixed.
The radio handset connector provides interface to a standard AAR handset. The handset interface provides for a PTT transmit
control signal, microphone audio, and receive audio.
The radio receives power fromthe locomotive or car battery. Battery input voltages are 74VDC for freight and locomotive
applications, and 37VDC in some light rail applications. A 13V battery input is also an option which is to be used for .
The radio typically supplies an output voltage of 13VDC to power the remote control head.
A connector is provided on the radio to interface to a standard personal computer (PC). This is a standard RS-232 interface
used to upload and download radio configuration files, radio status or diagnostics, and radio firmware. These functions are
supported through a special application program “12RIISETUP” program which is loaded on the PC.
12RII-RC
A
AR Remote
Radio System J5
J1
J2J3
PC Handset Antenna
M
o
u s
n e
t
i
n
g
Cab Controls
Audio Interfaces
Battery

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5.2. Clean Cab Radio systems
5.2.1. General Description
The 12RII-LC radio is compatible with the current 12R-LC radio in all its existing clean cab Applications. Refer to the block
diagramin the following section. In the clean cab application the primary interface for controls and audio signals is a front
panel located on the front of the radio. The radio also supports the standard Handset connector and program connector.
Antenna connection is provided through J1.
The 12RII-LC radio mounts onto the standard 17MT-1 AAR mounting Tray. The Mounting tray is typically located in an
enclosure similar to one specified in the AAR C&S manual in section 12-2. Power to the radio is provided through connector
J4. Typical locomotive battery voltage is 74VDC. Some transit light rail cab cars may provide 37VDC as the primary radio
voltage.
5.2.2. Block Diagram
5.2.3. Basic
Oper
ation
The Clean Cab
Radio is
capable of
performing all
standard radio
functions
associated with
transmitting and
receiving radio
signals. The
operator
controls are via
buttons on the
front panel.
Front panel
controls allow
for a variety of
channeling
controls,
volume, PTT,
and various
special
functions. The
front panel also
supports a full
12-character
phone pad
interface for
DTMF
PC Handset
Antenna
Optional Handset
&
speaker
Battery
12RII-LC
Clean Cab Radio
System
J4
J1
J2J3
J6
J8 Optional 2nd
Serial Remote
Control Head
NOTE:
Only one optional interface;
Accessory Option (J6) or Secondary
Serial Remote (J8) may be installed
at the same time.
FRONT PANEL ASSEMBLY

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signaling. Audio interfaces on the front panel include a front panel microphone, which is activated with the front panel PTT
button, and a radio speaker.
Optionally, the radio may have an accessory connector (J6) that is used for external controls and audio interfaces or an
interface to a serial control head (J8). J8 provides the necessary serial, audio and control lines necessary to support a front
panel assembly that is packaged in a Remote Control Head.
J6 provides a second handset or microphone input, a second speaker output, and some I/O lines that can provide control inputs
or indication output signals depending on the customer application. As inputs these control lines can be programmed to provide
functions associated with handset cradle or hang-up functions such as Mute, Quiet Line Disable, and Channel Revert.
Additionally, certain customer applications require outputs that provide indications of radio status such as Standby, Busy or
TX.
The radio can support only the Accessory J6 connector or the Optional second control head on J8, not both at the same time
without compromised performance. Audio signals are shared between the two options. However it is not likely that both
options would ever be required in a given application. The radio may have both connectors installed, but only one interface is
likely to be active at a time. This will allow for a “standard” radio to be installed ineither ofthe identified optional
installationconfigurations.
The radio receives power fromthe locomotive or car battery. Battery input voltages are 74VDC, or 37VDC. The radio
provides 13VDC outputs to power the accessory audio circuitry if necessary and to power the Serial Remote Control Head.
A connector is provided on the radio to interface to a standard personal computer (PC). This is an RS-2323 interface used to
upload and download radio configuration files, radio status or diagnostics, and radio firmware. These functions are supported
through a special application program “12RIISETUP” program which is loaded on the PC.

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5.3. Serial Remote Radio Systems (Future Option)
5.3.1. General Description
The standard 12RII-SR radio is identical in operation to the 12RII-LC radio except that it is not mounted in the typical brake
stand enclosure. The Serial Remote Control Head that is used in conjunction withthe 12RII-SR radio is mounted in the control
stand location. The radio is mounted in a locker or in the nose of the engine. A Serial Interface Cable is used to connect the
radio to the control head.
Optionally the radio supports the connection of a second control head on J8 and a radio handset at J2. Programconnector J3 is
also standard as on the other radio systems.
5.3.2. Block Diagram
5.3.3. Basic
Oper
ation
Operation of
the 12RII-SR
radio is
identical to the
12RII-LC
radio. The
front panel
assemblyis
identical in
both radio
systems.
5.4. Radi
o
Fina
l
Asse
mbl
y
Part
s
List
251303-0000 ASSY 12RII-LC 74V VHF X
251303-0001 ASSY 12RII-LC 74V VHF W/J6 X
251303-0100 ASSY 12RII-LC 36V VHF X
251303-0101 ASSY 12RII-LC 36V VHF W/J6 X
251303-1000 ASSY 12RII-RC 74V VHF X
PC Handset
Antenna
Primary
Serial Remote
Control Head
Battery
12RII-SR
Serial Remote Radio
System
J4
J1
J2J3
J7
J8 Optional 2nd
Serial Remote
Control Head

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251303-1100 ASSY 12RII-RC 36V VHF X
GSPN DESCRIPTION QTY QTY QTY QTY QTY QTY
017157-402 PWRSPLYVICOR74V 1 1 1
017157-401 PWRSPLYVICOR36V 1 1 1
227409-000 ASSYPOWERSUPPLYBOARD 74V 1 1 1
227409-001 ASSYPOWERSUPPLYBOARD 36V 1 1 1
180381-790 KIT12RIITK-790 PARTS 1 11111
227408-000 ASSYRADIO CONTROL BOARD 1 11111
202926-000 ASSYRADIO PROCESSORMODULE 1 11111
227410-000 FRONT PANEL ASSEMBLY 1111
065373-200 CHASSIS 1 11111
027105-000 HANDLE 1 11111
123306-100 BOTTOM COVER 1 11111
123305-100 TOP COVER 1 11111
022206-002 BLANK FRONTCOVER PLATE 1 1
123348-100 SIDE COVERPLATE (BLANK) 1111
123348-100 SIDE COVERPLATE W/J5 1 1
123347-101 COVER PLATE J6 1 1 1 1
123347-100 COVER PLATE J4 1 1
202150-611 CABLE ASSYRCB/FPB 1 1111
202150-610 Cable AssyPSB/RCB 1 11111
202150-510 CABLE ASSY(J5) 1 1
202150-410 CABLE ASSYJ6 1 1
202150-110 CABLE ASSY(J4) 1111
202150-210 CABLE ASSY(J2&J3) 1 11111
202150-010 CABLE ASSY3" RED W/ferrite 1 11111
202150-005 CABLE ASSY3" BLK RA/RG 1 11111
013496-3410 SCREW 4-40 X 5/16 PPH ITL SS 51 51 47 47 47 47
013496-3416 SCREW 4-40 X 1/2" PPHITL SS 7 77777
013496-3610 SCREW 6-32X5/16 PPH ITL SS 9 99999
013492-3616 SCREW 6-32 X 1/2 PPH SS 4 44444
202174-002 ASSYXFORMER 1 1
013492-3716 SCREW 8-32 X 1/2 PPH SS 2 2
013002-014 WASHER8 INTL SS 2 2
013009-3701 NUT8-32 HEX SS 2 2
013008-021 WASHER#8 FLTSS 2 2
113114-000 CAM LOCK 1 11111
013492-3912 SCREW 10-32 X 3/8 PPH SS 2 22222
013030-008 WASHER10 SPL SS 2 22222
013002-011 WASHER6 INTL SS 2 22222
013009-3602 WASHER#6 FLTSS 2 22222
013678-412 SCREW 4-40X3/8 CTSK SS 2 22222
005035-001 CLAMP CABLE .187 DIA 1 11111
005019-017 CABLE TIE 4L NAT 5 53333
5.5. Radio Front Assembly Parts List (LC version Only)
227410-000 ASSY 12RII FRONT PANEL

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GSPN DESCRIPTION QTY REF DES / DIN
227410-100 ASSY12RIIFRONT PANEL BOARD 1 1
202926-000 ASSY12RIIPROCESSORMODULE 1 2
022207-100 Keypad Left 1 6
022207-200 Keypad Numeric 1 7
022207-300 Keypad Right 1 8
006128-000 Foam 12R Speaker insert 1 15
006128-001 Foam 12R Mic insert 1 16
123363-001 GRILLE 12R SPEAKER3.35 1 14
202298-100 PANEL 12RIIFRONTW/LENS 1 5
013492-3810 SCREW 10-24X5/16 PPH SS 4 12
013496-3410 SCREW 4-40 X 5/16 PPH I 12 10
227173-001 ASSYSPEAKER 4 OHM 1 4
202167-001 ASSYLCD 12RII2x16 1 3

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6. Radio Architecture
The radio and control head architecture is depicted in the following block diagrams for each of the radio applications. The
radio deck in all applications is built around a common chassis.
Radio architecture was determined largely by the requirement to integrate in the TK-790 RF modules, and the need to integrate
circuit functions into fewer boards.
Standard radio modules for the radio deck are the Power Supply Board (PSB), RF Power Amplifier (RFPA),
Transmit/Receive Board (TXRX), Radio Control Board (RCB), and Radio Processor Module (RPM).
Standard connectors for all radios are; J1-Antenna, J2-Handset and J3-program connectors. Application or radio type specific
connectors are J4, J5, J6, J7 & J8.
The front panel assembly is made up of the Front Panel Board (FPB), RPM, LCD and Speaker assemblies. The front panel
assembly is installed on the front of the radio chassis for an LC radio. The front panel is also packaged in a remote mounted
enclosure to make a Serial Remote Control Head.

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6.1. RC Radio Block Diagram
T1
CN203
CN104
CN201
TXRX
CN202
J7J8
RFPA
CN1
CN3
W2
CN4
J1-J4
J5
J6
J7
CN2
GND
PSB
J6
J5
J1
ANTENNA
J5
POWER
&
CONTROL
RADIO CONTROL BOARD
J3 J11 J2
J4
J3
PGM
J2
HANDSET
J9
U1
RADIO
PROCESSOR
MODULE
J1A J1B
12RII-RC
Radio
J10
P1-P4
P5
P6
P7
J3 P2
P4

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6.2. LC Radio Block Diagram
CN203
CN104
CN201
TXRX
CN202
J7
J8
RFPA CN1
CN3
W2
CN4
J1-J4
J5
J6
J7
CN2
GND
PSB
J6
J5
J1
ANTENNA
J4
POWER
RADIO CONTROL BOARD
J6
ACCESSORY
(option)
J3 J11 J2
J4
J8 J3J4 FPB
FRONT
PANEL
J6 J5
P1
LCD
J3
PGM
J2
HANDSET
J9
U1
RADIO
PROCESSOR
MODULE
J1A J1B
U1
RPM
J
1J
2
Optional
2nd
CONTROL
HEAD
J3J4 FPB
FRONT
PANEL
J6 J5
P1
LCD
J1J2J3 HANDSETPGM
U1
RPM
J
1J
2
12RII-LC
Radio
J10P10
P9
OPTION
MODULE J1
P6
P1-P4
J7
P3 P2
P7
P3
P8

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6.3. SR Radio Block Diagram
CN203
CN104
CN201
TXRX
CN202
J7
RFPA
CN1
CN3
W2
CN4
J1-J4
J5
J6
J7
CN2
GND
PSB
J6
J4
J1
ANTENNA
J4
POWER
RADIO CONTROL BOARD
J6
ACCESSORY
(option)
J3 J11 J2
J5
J8
J3
PGM
J2
HANDSET
U1
RADIO
PROCESSOR
MODULE
J1A J1B
J7
J10
Optional
2nd
CONTROL
HEAD
J3J4 FPB
FRONT
PANEL
J6 J5
P1
LCD
J1J2J3 HANDSETPGM
U1
RPM
J
1J
2
12RII-SR
Radio
CONTROL
HEAD
J3J4 FPB
FRONT
PANEL
J6 J5
P1
LCD
J1J2J3 HANDSETPGM
U1
RPM
J
1J
2
J9
P10
P9
OPTION
MODULE J1
P6
P1-P4
P7
P3 P2
P7
J8
P8

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6.4. Radio Interfaces Signals
This section identifies the Interface signals associated with each connector used in the radio system(s).
6.4.1. External Connector Configurations
The following table shows the standard radio connectors associated witheach of the typical RC, LC & SR radio systems.
Although other connector options are possible, this list covers all possible applications knows to date.
6.4.2. J1 Antenna
J1 is an industry standard UHF (SO-49) connector used to interface to the voice radio antenna. J1 is connects to CN4 on the
RFPA board witha short piece of wire. This connector is common to all radio systems.
6.4.3. J2 6-Pin Handset
J2 supports an interface to a standard AAR 6-pin handset. Connector Pins, Signal Names, and descriptions are shown in the
table below. This connector is standard on all radio systems and interfaces in a common cable withJ3 Program connector to J2
on the RCB.
J2 AAR HANDSET SIGNAL INTERFACE
J2-Pin Signal Description Mating Connector
A Mic-Audio Modulation Input fromthe handset condenser. RCB J2-1
B Mic-Com Microphone Audio return (common with radio chassis). RCB J2-2
C PTT Push-To-Talk radio key input. RCB J2-3
D PTT-Com PTT Return (common with radio chassis). RCB J2-4
E Rec-Audio Audio output to receiver element in handset. RCB *J2-5
F HK Optional “Off Hook signal input. RCB *J2-6
* Either of these signals may be connected to J2-10 if interfacing to a DTMF PalmMic which requires B+ voltage.
6.4.4. J3 9-Pin Program
J3 provides an interface to a PC used for uploading and downloading firmware, radio statistics or configuration files. This is a
standard 9-pin Mini-D connector. This connector is standard on all radio systems and interfaces in a common cable with J2
Handset connector to J2 on the RCB. J3 interface signals are shown below.
Radio Model Description J1 Antenna J2 Handset J3 PGM J4 4-Pin J5 23-Pin J6 ** 12-Pin J7 Serial 1 J8 Serial
2
RC – AAR Remote X X X X
LC – Clean Cab X X X X
LC – Clean Cab W/Access X X X X X
LC – Clean Cab W/ 2nd Control Head X X X X *X
SR – Serial Remote X X X X X
SR – Serial Remote W/2nd Control Head X X X X X X
* J8 may be physically mounted on radio in the location typically used by J6. This is to allow for connection to existing cables
which may be to short to reach J8 location on the chassis.
** In some applications J6 is a 15 pin connector.

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J3 PROGRAM SIGNAL INTERFACE
J3-Pin Signal Description Mating Connector
2 RxData RS-2323 Serial Receive Data Input RCB J2-7
3 TX Data RS-2323 Serial Transmit Data Output RCB J2-8
5 Com Signal Common (common to radio chassis). RCB J2-9
6.4.5. J4 4-Pin Power Connector
J4 is used for primary and secondary input voltages for the 12RII-LC and 12RII-SR radio systems. The J4 cable plugs into J1-
J4 onthe Power Supply Board. J4 typical signal interfaces are shown in the table below.
J4 4-PIN POWER SIGNAL INTERFACE
J4-Pin Signal Description Mating Connector
A +74VDC Primary isolated input voltage PSB J1 / J2
B 13 VDC Com Common (radio chassis). PSB J4
C -74VDC Primary isolated input voltage return. PSB J2 / J1
D +13 VDC Secondary (Test) radio input voltage. PSB J3
6.4.6. J5 23-Pin Power & Control
J5 is used for input power, control and audio signal interfaces on the 12RII-RC radio. The J5 cable assembly plugs into J1-J4
on the Power Supply Board and J5 & J6 on the Radio Control Board.
The Following tables are the currently defined power interfaces used on 74V, 37V and 13V AAR Remote Control Radio
systems.
Standard 74 & 37 Volt Power Input. J5 23-PIN POWER SIGNAL INTERFACE (STD)
J5-Pin Signal Description Mating Connector
1- --
2 * +VIN Isolated input voltage PSB J1
3 * -VIN Isolated input voltage return PSB J2
4 +13VDC 13V Output PSB J3
5 13V COM 13V Common (radio chassis) PSB J4
* Radio must be specified as either 74V or 37V.
Alternate 37VPower Input. J5 23-PIN POWER SIGNAL INTERFACE (37V ALT.)
J5-Pin Signal Description Mating Connector
1- --
2--
3 * -VIN Isolated input voltage return PSB J2
4 * +VIN Isolated input voltage PSB J1
5 13V COM 13V Common (radio chassis) PSB J4
* These are for an alternate 37VBattery Interface.
13VPower Input. J5 23-PIN POWER SIGNAL INTERFACE (13V Only)
J5-Pin Signal Description Mating Connector
1 13VRTN Non-Isolated input voltage return PSB J1
2 +13V Non-Isolated Input voltage PSB J2
3- --
4 +13VDC 13V Output PSB J3
5 13V COM 13V Common (radio chassis) PSB J4

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GLOBAL SIGNALING DIVISION Title: 12RII FCC TECHNICAL MANUAL
The followingtable illustrates the standard control and audio signals.
J5 23-PIN CONTROL & AUDIO SIGNAL INTERFACE
J5-Pin Signal Description Mating Connector
6 Mic-Com Remote Microphone audio return RCB J6-2
7 Mic-Audio Remote Microphone audio input RCB J6-1
8 8 OhmAudio Out 10W 8 ohmaudio speaker output RCB J5-3
9 PTT Remote PTT input RCB J6-3
10 CH1 AAR Channel 1 Input Select Line RCB J5-4
11 CH2 AAR Channel 2 Input Select Line RCB J5-5
12 CH3 AAR Channel 3 Input Select Line RCB J5-6
13 CH4 AAR Channel 4 Input Select Line RCB J5-7
14 * TX Ind. I/O 1- transmit indication output RCB J6-9
15 Rec-Audio Remote low level receive audio output RCB J6-5
16 Audio Return Audio Common (radio chassis) RCB J6-7
17 * Standby I/O 2 - Standby indication output RCB J6-10
18 Channel Return AAR Channel Return Input RCB J5-8
19 N.C. --
20 13VCom Common (radio chassis) RCB J6-8
21 +13VOut Low Power 13V Output, fuse protected RCB J6-6
22 * QL Disable I/O 3 - QL disable input RCB J5-1
23 *Mute I/O 4 - Speaker Mute RCB J5-2
* I/O signals are programmable for user configurations. Signal functions are shown for reference only.

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6.4.7. J6 12-Pin Accessory
The 12-Pin Accessory connector is a typical option on the 12RII-LC radio. The J6 cable assembly plugs into J6 on the Radio
Control Board. The typical interface signals are shown below.
Note: As an alternate for some applications a 15 pin connector is supplied. Signal interface is identical except for pins M &
N. Speaker outputs are replaced withI/O-3 & I/O-4 signals.
J6 12-PIN ACCESSORY SIGNAL INTERFACE
J6-Pin Signal Description Mating Connector
A Mic-Audio Remote Microphone audio input RCB J6-1
B Mic-Com Remote Microphone audio return RCB J6-2
C PTT Remote PTT input RCB J6-3
D PTT Return PTT common (radio chassis). RCB J6-4
E Rec-Audio Remote low level receive audio output RCB J6-5
F +13VOut Low Power 13VOutput, fuse protected RCB J6-6
H Audio Return Audio Common (radio chassis) RCB J6-7
J 13V Com Common (radio chassis) RCB J6-8
K * TX Ind. I/O 1- transmit indication output RCB J6-9
L * Standby I/O 2 - Standby indication output RCB J6-10
#M Speaker + Remote Speaker Output RCB J6-11
#N Speaker - Remote Speaker Output RCB J6-12
* I/O signals are programmable for user configurations. Signal functions are shown for reference only.
# On alternate 15 pin connector these signals are I/O-3 & I/O-4 respectively, mating to J5-1 & J5-2 on the RCB.
6.4.8. J7 Primary Control Head
J7 is installed on the standard 12RII-SR radio as the primary control head interface. The J7 cable assembly plugs into J7 on the
Radio Control Board. Interface signals are shown in the table below.
J7 19-PIN CONTROL HEAD SIGNAL INTERFACE
J7-Pin Signal Description Mating Connector
J B+ 13V output to control head, fused. RCB J7-1
M Common 13V Return RCB J7-2
U RS485-A Serial Interface, differential current loop output RCB J7-3
S RS485-B Serial Interface, differential current loop output RCB J7-4
A Mic-Audio Control Head 1 Mic audio input to radio RCB J7-5
V Rec-Audio Low level receive audio to control head 1 RCB J7-6
F I/O I/O-3 ID signal to Control Head 1 RCB J7-7
T I/O I/O-4 Master/Slave or Enable signal to Control Head 1 RCB J7-8
K Speaker + Speaker output signal to Control Head 1 RCB J7-9
L Speaker - Speaker output signal t Control Head 1 RCB J7-10
N N.C. Not Connected RCB J7-11
E Shield Serial Cable Shield (radio chassis) RCB J7-12
6.4.9. J8 Secondary Control Head
J8 is an optional connector on 12RII-LC and SR radios to add a second control head interface. The J8 cable assembly plugs
into J8 on the Radio Control Board. Interface signals are shown in the table below.

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GLOBAL SIGNALING DIVISION Title: 12RII FCC TECHNICAL MANUAL
J8 19-PIN CONTROL HEAD SIGNAL INTERFACE
J8-Pin Signal Description Mating Connector
J B+ 13V output to control head, fused. RCB J8-1
M Common 13V Return RCB J8-2
U RS485-A Serial Interface, differential current loop output RCB J8-3
S RS485-B Serial Interface, differential current loop output RCB J8-4
A Mic.-Audio Control Head 1 Mic audio input to radio RCB J8-5
V Rec-Audio Low level receive audio to control head 2 RCB J8-6
F I/O I/O-1 ID signal to Control Head 2 RCB J8-7
T I/O I/O-2 Master/Slave or Enable to Control Head 2 RCB J8-8
K Speaker + Speaker output signal to Control Head 2 RCB J8-9
L Speaker - Speaker output signal t Control Head 2 RCB J8-10
N N.C. Not connected RCB J7-11
E Shield Serial Cable Shield (radio chassis) RCB J8-12

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7. Kenwood RFPA & TXRX Modules
The Radio Control Board interfaces the TXRX modules on J11 flex circuit connector. All controls to the RF modules are
through this connection. See the Appendix on Kenwood modules for descriptions and block diagrams.
8. POWER SUPPLY BOARD
8.1. General Description
The 12RII Power Supply Board (PSB) provides the regulated voltages necessary from the host battery input voltage of 74VDC
found on most locomotives, or 37VDC found on typical transit cars. The primary battery inputs voltages are isolated from the
radio chassis and internal voltages by the DC/DC converter module.
The primary battery input as well as the secondary 13V input is protected against reverse polarity. The DC/DC converter is
protected with Transient Voltage Suppression (TVS), filtering, and Over Voltage Protection (OVP) circuits to avoid damage of
the converter or the internal radio circuitry.
The PSB provides regulated 13VDC, 8VDC and 5VDC signals to power the internal radio modules.
8.2. Block Diagram
J1
J2
LC
FILTER
T
V
S
COMMON
MODE
FILTER
J3
J4
T
V
S
J6 J5
CAP
FILTER LC FILTER
PS1
DC/DC
CONVERTER
POWER SUPPLY
W2
BLK W1 RED
+
-
+Vin
-Vin
+13.6V
-13.6V
W3
B+
COM
+V
-V
BLK
RED
ORN
BLU F1
F2
COM B+ 8V 5V
J7
U2
8V
REG
U3
5V
REG
O
V
P
A
C
D
B
J4
TO
RFPA TO RCB