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Sony Receiver ICF Sw77 Drm Modufication Operation Instructions

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    Page 1 Date: 19-11-02 Page 1 of 8 Modification of Sony ICF-SW77 for DRM Software receiver
    Page 2 Date: 19-11-02 Page 2 of 8 Table of Contents 1 INTRODUCTION.........................................................................................................................................3 1.1 PURPOSE OF THIS DOCUMENT...................................................................................................................3 1.2 ORGANIZATION OF THIS DOCUMENT........................................................................................................3 2 SYSTEM...
    Page 3 Date: 19-11-02 Page 3 of 8 1 Introduction 1.1 Purpose of this document This document describes how to modify a Sony ICF-SW77 short wave receiver to be able to receive a DRM signal. Therefore the DRM – Miniature Mixer Unit from Sat-Service Schneider is used, to mix down the 455 kHz IF of the receiver to a 12 kHz IF. This 12 kHz IF is feed to a PC sound card. Please note that the manufacturers warranty will be discarded if you do this modification. 1.2 Organization of this document Chapter...
    Page 4 Date: 19-11-02 Page 4 of 8 wide band filternarrow band filterZF inGND The IF section has two IF filters, a narrow band filter and a wide band filter. One of these filters has to be replaced by a wider filter with appr. 10 kHz bandwidth. The filter ‘W’ is active if the receiver is in ‘wide’ mode, the filter ‘N’ is active if the receiver is in ‘narrow’ mode.
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