12. Attach the rear panel and mount the power supply unit.

13.Connect the four plugs from the connector fixing plate to the RF CONV Board as shown in Figure 23.

POWER

DIMMER

LOCK

 

 

MOBILEINMARSAT-B

 

 

 

 

 

EARTH

STATION

 

 

 

 

 

 

 

COMPASS

 

 

 

BEARING

 

AOR-

 

ELEVATION

 

S

LEVEL

 

AOR-WEST

 

 

POR

EAST

TEL

 

 

I

 

1

 

OR

 

TEL

 

 

 

2

 

READY

TEL

3

 

TX

 

TEL

4

 

FAIL

 

TEL

5

 

 

TEL

 

 

 

6

 

 

 

TELEX

 

 

 

DATA

 

J11

J7

J9

 

J8

 

Connector

RF CONV

assy.

Board

TX IF

 

 

 

 

 

J9

 

 

 

 

RX IF

 

 

 

 

 

J7

 

 

 

 

REF

 

 

 

 

 

J8

 

 

 

 

(DGPS

 

 

 

 

(J11)

 

 

 

 

OUT)

 

 

 

 

RF CONV Board

Figure 23 Communication unit, right side view

14.Attach the cover.

15.Plug in all connectors to the rear panel.

5.2.3 Wiring between HSD modem and communication unit

1.Connect the communication unit to the IB-681 with three coaxial cables (TX IF, RX IF, REF connectors) and one serial cable with 9 pin connector (HSD CTRL connector).

TX IF

RX IF

REF

COMMUNICATION

UNIT IB-281

Coaxial cable (Max. 5 m, BNC-P-55UX2)

TX IF

 

 

RX IF

 

 

REF HSD

16S0277

MODEM

 

Ship’s

 

IB-681

 

mains

HSD CTRL

HSD CTRL

Serial cable (Max. 5 m, 17JE-573-2 harness)

Figure 24 Connection of IB-681 and communication unit

5.2.4 Ground

Connect the copper strap (supplied) between the earth terminal on the IB-681 and ship’s superstructure.

CAUTION

Ground the equipment to prevent electrical shock and mutual interference.

26

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Image 36
Furuno IB-681 manual Wiring between HSD modem and communication unit, Ground, J11