Kenwood Rfpa & Txrx Modules; Power Supply Board; General Description; Block Diagram - GE 12R II Series Technical Manual

GE
TRANSPORTATION
SYSTEMS
GLOBAL SIGNALING DIVISION
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

POWER SUPPLY
J4
BLU
+Vin
J1
A
ORN
-Vin
J2
C
RED
+13.6V
D
J3
BLK
-13.6V
B
J4
COE Communications Engineering Document
Author:
Keith Gilbertson
Date:
3/08/02
Title:
12RII FCC TECHNICAL MANUAL
F1
T
LC
V
FILTER
S
F2
T
CAP
V
FILTER
S
+V
COMMON
MODE
FILTER
-V
B+
COM
COM B+
J6 J5
W2 W1
BLK RED
TO
RFPA
Rev:
Pag
e:
O PS1
V DC/DC
P CONVERTER
LC
FILTER
U2 U3
8V 5V
REG REG
8V 5V
J7
W3
TO
RCB
A
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