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Sony Receiver ICF 7600D ICF 7600DS Operating Instructions

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    Page 1 Dietmar Adolf (info@asystec.de) DRM Reception With SONY ICF-7600D/DS (ICF-2002/2003) v1.02 2004-02-09 first released version v1.10 2004-02-14 external antenna connector, EMI suppression, AC harmonics suppression v2.00 2004-02-17 compact version with lowres pics This report is intended to help others, but no abso lutely no warranty is granted, if any damages resul t from following these steps. This popular vintage receiver from 1983 should be m odified to support DRM radio...
    Page 2 The 12 kHz DRM output signal will be hooked to the “line out” jack socket labelled with a tape symbol. The original audio output signal will be di sconnected, as it is not of much use anyway. The signal is far below specs for “line out”. This is how to proceed:
    Page 3 IF Tapping Looking at the circuit diagram, we identify two pos sible IF tap points for the DRM down mixer input: a) Pin 14 of IC1: This is the input pin of the AM I F amplifier. Here, the signal has passed the 450 kHz ceramic filter CF3, then has been amplified by transistor Q12 and DC-decoupled by C69. As the IF filter is reported to be a CFW450 H, we expect an AM bandwidth of +/- 3 kHz only. If the specs are strictly met, this will not be enough for DRM reception. b)...
    Page 4 The ceramic filter SFR450I is different than what w e expected and has a destinctively small bandwidth of only +/- 2 kHz and rather steep edges. While yielding an very good selectivity for AM baseband signals, this means, that option a) would fail for DRM, as we need a bandwidth 8 kHz or so. Yet, this also means that we cannot use the pre -amplified IF. Instead, we need to identify T9 (circled red) and R 68 on the soldering side and connect the down mixer IF input to them. The mixer...
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