COE Communications Engineering Document
Author:
Keith Gilbertson
Rev:
A
Date:
3/08/02
Pag
e:
21
of
33
GE
TRANSPORTATION
SYSTEMS
GLOBAL SIGNALING DIVISION
Title:
12RII FCC TECHNICAL MANUAL
8.3. Board Interface Signals
8.4. External Interface Voltages
External voltages are connected to the PSB on terminals J1-J4. These voltage signals can come from Radio Connector J4 in a
12RII-LC or 12RII-SR radios. In a 12R-RC radio they are connected to radio connector J5
8.4.1. J1 (+Vin)
The primary battery positive voltage is connected to this input terminal.
8.4.2. J2 (–Vin)
The primary battery negative voltage is connected to this input terminal.
8.4.3. J3 (B+ )
This terminal can be used for an input or an output. To be used as an output, the proper primary battery voltage must be applied
to terminals J1 & J2. The regulated output of the DC/DC converter is available at this terminal. If this terminal is to be used as
a B+ (12 – 15VDC) test input for the radio, there cannot be a primary battery signal connected to terminals J1 or J2.
8.4.4. J4 (Com)
This terminal is used to connect to the radio ground or common signal. It is also connected to radio chassis.
8.5. RFPA Interface Voltages
8.5.1. J5 (B+)
This terminal is used to supply the high current regulated B+ voltage directly to the RFPA Module.
8.5.2. J6 (Com)
This terminal is used to connect circuit common directly to radio chassis.
8.6. RCB Interface Voltages
8.6.1. J7-1, 2, & 3, (B+)
Three circuit pins are used to connect the regulated 13.4VDC of the DC/DC converter to the RCB board.
8.6.2. J7-4 (+5V)
This circuit pin is used to provide +5VDC to the RCB module.
8.6.3. J7-5 (+8V)
This circuit pin is used to provide +8VDC to the RCB module.
8.6.4. J7-6, 7, & 8(Com)
These three circuit pins are used to connect the radio common to the RCB module. Circuit common is also connected to radio
chassis.
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