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Grundig Yachtboy400 Drm Modification Manual

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    Page 1 Gru ndig Y ach t B oy 4 00 – L ow C ost D RM M od Introduction Inthis document wepresent amodification tothe Grundig YB400short-wave receiver tomake itsuitable forDRM down-frequency conversion.Aswe donot have schematics ofthis receiver, wehave beenforced tomake testsbyourselves… andfour receivers laterwehave achieved asuitable modification whichhasbeen abletodecode a -87 dBm channel power signal. This receiver adaptation allowsalow cost solution (about forDRM reception. Theoutput...
    Page 2 Itmust betaken intoaccount thatthesignal levelatthis point isnot affected by the AGC (Automatic GainControl), soitwill notbevery powerful. Weareworking it out bynow but,forthe moment, anaudio amplifier atthe output doesthework. This will be explained later. Thisfrequency isset tobe 455 KHz although itcould beshipped witha centering error.Wehave found itto be asbig as300 Hzinone model. Thiscanbe solved just by adjusting a resonator blue marked in figure 2. Another important factabout thissignal bandwidth...
    Page 3 Inorder toachieve thisextra powering aCEBEK (PM-4)audiolineamplifier has been used. Wehave removed theinternal radiospeaker tomake roomforthis module as shown in figure 3. Theneed forthis amplification inthe last stage, at12 KHz, isdetermined bythe digital natureofthe sound card.Thiscard, aPC standard one,hasanADC afterthe anti-aliasing filter.TheADC ideally shouldbeexcited withanormalized signaltoits dynamic margin,otherwise thequantification errorwillincrease about6dB ofextra noise foreach unused...
    Page 4 Theextra connections havebeen made topresent anice front-end tothis DRM modification as depicted in figure 4. Figure 4. External interface of the DRM modification to the Grundig YB400 receiver. The software receiver output is shown in figure 5. Figure 5. Software receiver output.
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