Chapter 3 Block Description; General - Furuno FELCOM 12 Service Manual

3.1 General

Interconnection diagram of FELCOM 12 is shown below.
Communication Unit: IC-212 and Antenna Unit: IC-112 are connected with a coaxial
cable, through which receiving signals of 1530.0 to 1545.0 MHz, transmitting signals
of 1626.5 to 1646.5 MHz, and power supplies from IC-212 to IC-112 ( +29 V for the
transmitting and +18 V for the receiving ) are sent.
The signal transmission loss of the coaxial cable in 1.6 GHz band is estimated to be 3
to 13 dB, so the cable to be used should be selected from specified cables in
accordance with the cable length between the two units.
IC-212 consists of REG, CPU, RF CON, and TX boards. IC-112 consists of an
antenna board: ANT, a diplexer: DIPLEXER, and a helical antenna.
GPS position signals can be received with an optional GPS receiver board (GN-74)
installed in IC-212. The GPS signals are not only utilized for FELCOM 12, but
outputted therefrom in NMEA-0183 format. Outputted are GLL, GGA, VTG, RMC,
and ZDA.
DC24V
*
AC/DC power
24V DC
supply
(PR-300)
AC100/200
BATT 24V

Chapter 3 Block Description

IC-112
FURUNO
• 5D-FB-CV : 30m
• 8D-FB-CV : 50m
• 12D-SFA-CV : 100m
DC24V
ANT
DTE 1
IC-212
DMC 1
DMC 2
BUZZER
*
NMEA
GPS received
board
DTE 2
DATA
Figure 3-1 Configuration of FELCOM12
3-1
IB-581
24V DC
IC-302 IC-302
NP NP
NMEA-0183
*
I/F BOX
(OP16-14)
*
IB-581
*
IB-581
or PC
KEYBOARD
PP-510
DC24V
IC-303
NP
• IC-302 : Distress Alert Unit
• IC-303 : Received Call Unit
Navaid
*
EGC printer
(PP-505)
*: optional