GE 12R II Series Technical Manual page 5

GE
TRANSPORTATION
SYSTEMS
GLOBAL SIGNALING DIVISION
5.1.2. AAR Remote Radio System Block Diagram
PC Handset
J3
12RII-RC
AAR Remote
Radio System
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 from a 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 from the 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 from the 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.
Author:
Date:
Title:
J2
J1
J5
COE Communications Engineering Document
Keith Gilbertson
3/08/02
12RII FCC TECHNICAL MANUAL
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Cab Controls
Audio Interfaces
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