Wr Board - Furuno FS-1575 Service Manual

Ssb radiotelephone

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7.4 WR Board

WR1 (DSC Distress/Safety frequency Watch/receive board): 05P0847A

WR2 (DSC General frequency Watch/receive board): 05P0847B

WR1 and WR2 are DSC frequency scan receive boards.

WR1 is a Distress and Safety frequencies receive board, while WR2 (option) is a DSC

General frequencies receiver board. The WR1 and WR2 boards are not available for

shared use because they are different in IF frequency.

The WR boards consist of a receiving RF circuit, IF circuit, and local oscillation circuit.

Received output signal is outputted to the T-CPU board by the 2nd IF signal (36 kHz)

and demodulated and decoded there. The receiving total gain of the WR1 and WR2

boards is approximately 50dB or more, respectively.

When a FAX-5

2.6m whip antenna is connected to the WR1 and WR2 boards,

respectively, set "J3" of the WR boards to the "active" side, and then supply 12V

power to the FAX-5 pre-amplifier.

DDS RESET WR

CONFIDENTIAL (internal use only)

This confidential document is used only by FURUNO authorized persons.

It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.

Fig. 7.4.1 WR Board Block Diagram

WR1: 35.964MHz

WR2: 44.964MHz

DDS RESET WR

WR1: 05P0847A

WR2: 05P0847B

7.4 WR Board

WR1: F+35.964MHz

WR2: F+44.964MHz

Fs-2575 Fs-5075