GE Transportation Systems Global Signaling LLC GS12RII-V1 Manuel D’Utilisation
COE Communications Engineering Document
Author:
Keith Gilbertson
Rev:
A
Date:
3/08/02
Pag
e:
24
of
33
GE
TRANSPORTATION
SYSTEMS
SYSTEMS
GLOBAL SIGNALING DIVISION
Title:
12RII FCC TECHNICAL MANUAL
RS-232 (2)
Two RS-232 ports are provided. The primary RS-232 port is connected to radio connector J3. This port is connected to a PC,
for uploading and downloading the Radio Configuration File and for executing the dynamic tuning of radio parameters stored in
EEPROM. The second RS-232 port is for future use.
Two RS-232 ports are provided. The primary RS-232 port is connected to radio connector J3. This port is connected to a PC,
for uploading and downloading the Radio Configuration File and for executing the dynamic tuning of radio parameters stored in
EEPROM. The second RS-232 port is for future use.
10.2. Audio
Circuits
The RCB audio circuits provides the necessary audio interfaces, routing, audio processing and gain control necessary for the
radio operation. Circuitry is also provided to generate & decode necessary radio tones for dispatch call, Sub-Audible Squelch,
and MSK data signals (future).
radio operation. Circuitry is also provided to generate & decode necessary radio tones for dispatch call, Sub-Audible Squelch,
and MSK data signals (future).
10.2.1. Transmit Audio Inputs
Three audio inputs (HSMIC, MIC1, and MIC2) are used for transmit modulation. The HSMIC signal comes from the radio
handset interface (J2). MIC1 signal comes form the Front panel, and MIC2 comes from the Remote Interface or the second
serial control head (Optional). These transmit audio input signals will be applied to the TXRX module modulation inputs MB
& MO after processing and filtering. The TXRX module uses a dual point modulation scheme hence the two input signals
required.
handset interface (J2). MIC1 signal comes form the Front panel, and MIC2 comes from the Remote Interface or the second
serial control head (Optional). These transmit audio input signals will be applied to the TXRX module modulation inputs MB
& MO after processing and filtering. The TXRX module uses a dual point modulation scheme hence the two input signals
required.
10.2.2. Receive Audio Input
The primary receive signal input is the “DET” signal from the TXRX module. This is the discriminator output from the radio
receiver. In Normal operation this receive signal will be processed and applied to the appropriate audio output device such as
the radio speaker or handset element.
receiver. In Normal operation this receive signal will be processed and applied to the appropriate audio output device such as
the radio speaker or handset element.
An optional input signal “DET2”is provided for in the Option Module connection at J9. This is for future use.
10.2.3. Audio Outputs
The RCB transmit audio outputs are the “MO” and “MB” signals. These signals are applied to the TXRX module to provide
the required dual port modulation.
the required dual port modulation.
Normal radio receive audio outputs signals are applied to the radio speaker (located on the front panel) and handset receive
element. These interface signals are “SPKR1” and “HSAUD”. Additionally a Remote Handset and second speaker are
supported by “AUD2” and “SPKR2” signals. “AUD1” signal is used to provide low level receive audio to a Control Head in
the SR Radio system.
element. These interface signals are “SPKR1” and “HSAUD”. Additionally a Remote Handset and second speaker are
supported by “AUD2” and “SPKR2” signals. “AUD1” signal is used to provide low level receive audio to a Control Head in
the SR Radio system.
10.2.4. Transmit Audio Pre-emphasis
The standard 750us pre-emphasis circuit of the radio is made up from the inverting amplifier in U10 and associated components
R21 and C7.
R21 and C7.
10.2.5. Receive Audio De-emphasis
The standard 750us de-emphasis circuit is made up from the inverting amplifier in U9 and associated components R12, C5 &
C47.
C47.
10.2.6. Routing, Processing & Gain Control
The audio routing, processing and gain control of the audio circuitry are controlled by software through the use of mixed signal
audio processing integrated circuits (IC’s). The radio configuration file contains audio maps for each of the primary operating
modes in the radio. The audio maps allow the signal paths and gains to be adjusted for different radio modes and applications.
These devices and primary functions are listed below;
audio processing integrated circuits (IC’s). The radio configuration file contains audio maps for each of the primary operating
modes in the radio. The audio maps allow the signal paths and gains to be adjusted for different radio modes and applications.
These devices and primary functions are listed below;
The MX029 is a digital controlled gain device that allows for input and output selection as well. This device is primarily used
for transmit signal input selection and receive audio output selection as well as providing gain control. Each MX029 also
contains an analog inverting amplifier.
for transmit signal input selection and receive audio output selection as well as providing gain control. Each MX029 also
contains an analog inverting amplifier.