Codec - Furuno FS-1575 Service Manual

Ssb radiotelephone

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Table of Contents

CODEC

1) CHECK ON signal: 50 ohm Dummy Load ON

In order to up the accuracy of self-tests on the transmission circuit and prevent the

radiation of radio waves, TX FIL output power is connected to the "R44" 51 ohm

35 W dummy load when conducting a self-test.

2) TX ON, DA ON, PA ON signals

The "TX ON" signal puts the TX board into a transmission-ready state. The "DA

ON" and "PA ON" signals turn ON the BIAS circuit of the DRV and PA boards.

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. 6.1.5 TX FIL board CHK signal

Table 6.1.3 States at SELF TEST

6.1 [MENU] -> TEST

2, 4, 8, 12,

Fs-2575 Fs-5075